perl function getgrent not worked with libnss

p5pRT commented 7 years ago

Migrated from rt.perl.org#132351 (status was 'open')

Searchable as RT132351$

p5pRT commented 7 years ago

From asper@tagan.ru

Created by asper@tagan.ru

perl function getgrent not worked in perl higer 5.20.x if enabled sys-auth/libnss-pgsql library if the groups are taken from the file\, then everything is fine\, and if the groups are taken from the database\, then the getgent function hangs

I prepared a simple test script to check this perl -e 'while ($a =getgrent) {print $a . "\n";}' this script hangs if it is enabled to take groups and users from the database\, this error is absent in the version 5.20 perl and below

my nsswitch config file cat /etc/nsswitch.conf # /etc/nsswitch.conf: # $Header: /var/cvsroot/gentoo/src/patchsets/glibc/extra/etc/nsswitch.conf\,v 1.1 2006/09/29 23:52:23 vapier Exp $

group: pgsql files passwd: pgsql files shadow: pgsql files

#passwd: compat #shadow: compat #group: compat

# passwd: db files nis # shadow: db files nis # group: db files nis

hosts: files dns networks: files dns

services: db files protocols: db files rpc: db files ethers: db files netmasks: files netgroup: files bootparams: files

automount: files aliases: files

system utils getent group - work fine

Perl Info

``` Flags: category=core severity=high Site configuration information for perl 5.24.3: Configured by Gentoo at Fri Oct 20 13:19:22 MSK 2017. Summary of my perl5 (revision 5 version 24 subversion 3) configuration: Platform: osname=linux, osvers=4.0.9-gentoo, archname=x86_64-linux uname='linux gbase 4.0.9-gentoo #1 smp thu may 26 12:49:22 msk 2016 x86_64 qemu virtual cpu version 2.3.0 authenticamd gnulinux ' config_args='-des -Dinstallprefix=/usr -Dinstallusrbinperl=n -Di_ndbm -Di_gdbm -Di_db -DDEBUGGING=none -Dinc_version_list=5.24.2/x86_64-linux 5.24.2 5.24.1/x86_64-linux 5.24.1 5.24.0/x86_64-linux 5.24.0 -Dlibpth=/usr/local/lib64 /lib64 /usr/lib64 -Dnoextensions=ODBM_File -Duseshrplib -Darchname=x86_64-linux -Dcc=x86_64-pc-linux-gnu-gcc -Doptimize=-O2 -pipe -march=x86-64 -mtune=generic -Dldflags=-Wl,-O1 -Wl,--as-needed -Dprefix=/usr -Dsiteprefix=/usr/local -Dvendorprefix=/usr -Dscriptdir=/usr/bin -Dprivlib=/usr/lib64/perl5/5.24.3 -Darchlib=/usr/lib64/perl5/5.24.3/x86_64-linux -Dsitelib=/usr/local/lib64/perl5/5.24.3 -Dsitearch=/usr/local/lib64/perl5/5.24.3/x86_64-linux -Dvendorlib=/usr/lib64/perl5/vendor_perl/5.24.3 -Dvendorarch=/usr/lib64/perl5/vendor_perl/5.24.3/x86_64-linux -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dvendorman1dir=/usr/share/man/man1 -Dvendorman3dir=/usr/share/man/man3 -Dman1ext=1 -Dman3ext=3pm -Dlibperl=libperl.so.5.24.3 -Dlocincpth=/usr/include -Dglibpth=/lib64 /usr/lib64 -Duselargefiles -Dd_semctl_semun -Dcf_by=Gentoo -Dmyhostname=localhost -Dperladmin=root@localhost -Ud_csh -Dsh=/bin/sh -Dtargetsh=/bin/sh -Uusenm -Di_ndbm -Di_gdbm -Di_db -DDEBUGGING=none -Dinc_version_list=5.24.2/x86_64-linux 5.24.2 5.24.1/x86_64-linux 5.24.1 5.24.0/x86_64-linux 5.24.0 -Dlibpth=/usr/local/lib64 /lib64 /usr/lib64 -Dnoextensions=ODBM_File' hint=recommended, useposix=true, d_sigaction=define useithreads=undef, usemultiplicity=undef use64bitint=define, use64bitall=define, uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='x86_64-pc-linux-gnu-gcc', ccflags ='-fwrapv -fno-strict-aliasing -pipe -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64', optimize='-O2 -pipe -march=x86-64 -mtune=generic', cppflags='-fwrapv -fno-strict-aliasing -pipe' ccversion='', gccversion='4.9.3', gccosandvers='' intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678, doublekind=3 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16, longdblkind=3 ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=8, prototype=define Linker and Libraries: ld='x86_64-pc-linux-gnu-gcc', ldflags ='-Wl,-O1 -Wl,--as-needed' libpth=/usr/local/lib64 /lib64 /usr/lib64 /usr/lib/gcc/x86_64-pc-linux-gnu/4.9.3/include-fixed /usr/lib /lib/../lib64 /usr/lib/../lib64 /lib libs=-lpthread -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat perllibs=-lpthread -lnsl -ldl -lm -lcrypt -lutil -lc libc=libc-2.23.so, so=so, useshrplib=true, libperl=libperl.so.5.24.3 gnulibc_version='2.23' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E' cccdlflags='-fPIC', lddlflags='-shared -O2 -pipe -march=x86-64 -mtune=generic -Wl,-O1 -Wl,--as-needed' Locally applied patches: gentoo/hints_hpux - Fix hpux hints gentoo/aix_soname - aix gcc detection and shared library soname support gentoo/EUMM-RUNPATH - https://bugs.gentoo.org/105054 cpan/ExtUtils-MakeMaker: drop $PORTAGE_TMPDIR from LD_RUN_PATH gentoo/config_over - Remove -rpath and append LDFLAGS to lddlflags gentoo/opensolaris_headers - Add headers for opensolaris gentoo/patchlevel - List packaged patches for perl-5.24.3(#1) in patchlevel.h gentoo/cleanup-paths - Cleanup PATH and shrpenv gentoo/enc2xs - Tweak enc2xs to follow symlinks and ignore missing @INC directories. gentoo/darwin-cc-ld - https://bugs.gentoo.org/297751 darwin: Use $CC to link gentoo/cpan_definstalldirs - Provide a sensible INSTALLDIRS default for modules installed from CPAN. gentoo/interix - Fix interix hints gentoo/create_libperl_soname - https://bugs.gentoo.org/286840 Set libperl soname gentoo/mod_paths - Add /etc/perl to @INC gentoo/EUMM_perllocalpod - cpan/ExtUtils-MakeMaker: remove targets that generate perllocal.pod gentoo/drop_fstack_protector - https://bugs.gentoo.org/348557 Don't force -fstack-protector on everyone gentoo/usr_local - Configure: Don't include sources in /usr/local/ for compiling perl gentoo/D-SHA-CFLAGS - https://bugs.gentoo.org/506818 Do not set custom CFLAGS in cpan/Digest-SHA gentoo/io_socket_ip_tests - cpan/IO-Socket-IP: Disable network tests gentoo/cygwin-libperl - Cygwin: avoid libperl.dll.dll.a gentoo/tests - Fixup EUMM perlocal.pod tests and customised SHA1s gentoo/zlib-1.2.9-backported-fixes - [rt#119762] Compress-Raw-Zlib: backport zlib 1.2.9+ fixes from upstream 2.073 debian/cpan-missing-site-dirs - Fix CPAN::FirstTime defaults with nonexisting site dirs if a parent is writable debian/makemaker-pasthru - Pass LD settings through to subdirectories fixes/memoize_storable_nstore - [rt.cpan.org #77790] Memoize::Storable: respect 'nstore' option not respected fixes/podman-pipe - Better errors for man pages from standard input fixes/respect_umask - Respect umask during installation fixes/net_smtp_docs - [rt.cpan.org #36038] Document the Net::SMTP 'Port' option fixes/document_makemaker_ccflags - [rt.cpan.org #68613] Document that CCFLAGS should include $Config{ccflags} fixes/parallel-manisort.patch - Fix parallel building @INC for perl 5.24.3: /etc/perl /usr/local/lib64/perl5/5.24.3/x86_64-linux /usr/local/lib64/perl5/5.24.3 /usr/lib64/perl5/vendor_perl/5.24.3/x86_64-linux /usr/lib64/perl5/vendor_perl/5.24.3 /usr/local/lib64/perl5 /usr/lib64/perl5/vendor_perl /usr/lib64/perl5/5.24.3/x86_64-linux /usr/lib64/perl5/5.24.3 Environment for perl 5.24.3: HOME=/root LANG=ru_RU.UTF-8 LANGUAGE (unset) LC_ALL= LC_COLLATE=C LC_MESSAGES=C LC_TIME=C LD_LIBRARY_PATH (unset) LOGDIR (unset) PATH=/usr/x86_64-pc-linux-gnu/gcc-bin/4.9.3:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/opt/bin PERL_BADLANG (unset) SHELL=/bin/bash -- Regards, Michael A. Manerko Megalink Company, Engineer 318, Chehova street, Taganrog, Russia, 347932 tel work: +7 8634 431431 (ext 159) tel mobile: +7 999 6939428 sip: 159@tagan.ru www.tagan.ru ```

p5pRT commented 7 years ago

From @jkeenan

On Mon\, 23 Oct 2017 10:55:44 GMT\, asper@tagan.ru wrote:

This is a bug report for perl from asper@tagan.ru\, generated with the help of perlbug 1.40 running under perl 5.24.3.

----------------------------------------------------------------- [Please describe your issue here] perl function getgrent not worked in perl higer 5.20.x if enabled sys-auth/libnss-pgsql library if the groups are taken from the file\, then everything is fine\, and if the groups are taken from the database\, then the getgent function hangs

I prepared a simple test script to check this perl -e 'while ($a =getgrent) {print $a . "\n";}' this script hangs if it is enabled to take groups and users from the database\, this error is absent in the version 5.20 perl and below

Do you get any output at all if it is enable to take groups and users from the database?

my nsswitch config file cat /etc/nsswitch.conf # /etc/nsswitch.conf: # $Header: /var/cvsroot/gentoo/src/patchsets/glibc/extra/etc/nsswitch.conf\,v 1.1 2006/09/29 23:52:23 vapier Exp $

group: pgsql files passwd: pgsql files shadow: pgsql files

#passwd: compat #shadow: compat #group: compat

# passwd: db files nis # shadow: db files nis # group: db files nis

hosts: files dns networks: files dns

services: db files protocols: db files rpc: db files ethers: db files netmasks: files netgroup: files bootparams: files

automount: files aliases: files

system utils getent group - work fine

-- James E Keenan (jkeenan@cpan.org)

p5pRT commented 7 years ago

The RT System itself - Status changed from 'new' to 'open'

p5pRT commented 7 years ago

From asper@tagan.ru

23.10.2017 23:26\, James E Keenan via RT Ð¿Ð¸ÑÐµÑ:

On Mon\, 23 Oct 2017 10:55:44 GMT\, asper@tagan.ru wrote:

This is a bug report for perl from asper@tagan.ru\, generated with the help of perlbug 1.40 running under perl 5.24.3.

----------------------------------------------------------------- [Please describe your issue here] perl function getgrent not worked in perl higer 5.20.x if enabled sys-auth/libnss-pgsql library if the groups are taken from the file\, then everything is fine\, and if the groups are taken from the database\, then the getgent function hangs

I prepared a simple test script to check this perl -e 'while ($a =getgrent) {print $a . "\n";}' this script hangs if it is enabled to take groups and users from the database\, this error is absent in the version 5.20 perl and below

Do you get any output at all if it is enable to take groups and users from the database? There is no output\, the script hangs (infinite loop?) The execution of the script can be interrupted by ^Ð¡.

We use the x2go server\, when upgrading the pearl above 5.20 clients can not connect to the server. Traced the function on which the client connection hangs - it turned out to be a gettent. After that\, I checked on other versions of perl 5.22\, 5.24\, 5.26 on all this function with the enabled livens hangs.

my nsswitch config file cat /etc/nsswitch.conf # /etc/nsswitch.conf: # $Header: /var/cvsroot/gentoo/src/patchsets/glibc/extra/etc/nsswitch.conf\,v 1.1 2006/09/29 23:52:23 vapier Exp $

group: pgsql files passwd: pgsql files shadow: pgsql files

#passwd: compat #shadow: compat #group: compat

# passwd: db files nis # shadow: db files nis # group: db files nis

hosts: files dns networks: files dns

services: db files protocols: db files rpc: db files ethers: db files netmasks: files netgroup: files bootparams: files

automount: files aliases: files

system utils getent group - work fine

-- Regards\, Michael A. Manerko

Megalink Company\, Engineer 318\, Chehova street\, Taganrog\, Russia\, 347932 tel work: +7 8634 431431 (ext 159) tel mobile: +7 999 6939428 sip: 159@tagan.ru www.tagan.ru

p5pRT commented 7 years ago

From @jkeenan

On Thu\, 26 Oct 2017 03:52:19 GMT\, asper@tagan.ru wrote:

23.10.2017 23:26\, James E Keenan via RT Ð¿Ð¸ÑÐµÑ:

On Mon\, 23 Oct 2017 10:55:44 GMT\, asper@tagan.ru wrote:

This is a bug report for perl from asper@tagan.ru\, generated with the help of perlbug 1.40 running under perl 5.24.3.

----------------------------------------------------------------- [Please describe your issue here] perl function getgrent not worked in perl higer 5.20.x if enabled sys-auth/libnss-pgsql library if the groups are taken from the file\, then everything is fine\, and if the groups are taken from the database\, then the getgent function hangs

I prepared a simple test script to check this perl -e 'while ($a =getgrent) {print $a . "\n";}' this script hangs if it is enabled to take groups and users from the database\, this error is absent in the version 5.20 perl and below

Do you get any output at all if it is enable to take groups and users from the database? There is no output\, the script hangs (infinite loop?) The execution of the script can be interrupted by ^Ð¡.

We use the x2go server\, when upgrading the pearl above 5.20 clients can not connect to the server. Traced the function on which the client connection hangs - it turned out to be a gettent. After that\, I checked on other versions of perl 5.22\, 5.24\, 5.26 on all this function with the enabled livens hangs.

my nsswitch config file cat /etc/nsswitch.conf # /etc/nsswitch.conf: # $Header: /var/cvsroot/gentoo/src/patchsets/glibc/extra/etc/nsswitch.conf\,v 1.1 2006/09/29 23:52:23 vapier Exp $

group: pgsql files passwd: pgsql files shadow: pgsql files

#passwd: compat #shadow: compat #group: compat

# passwd: db files nis # shadow: db files nis # group: db files nis

hosts: files dns networks: files dns

services: db files protocols: db files rpc: db files ethers: db files netmasks: files netgroup: files bootparams: files

automount: files aliases: files

system utils getent group - work fine

This is going to be difficult for us to debug because there are several factors --- the x2go server\, the libnss-pgsql library\, the use of a database for NSS -- which are outside the scope of the Perl 5 core distribution and which will be difficult for our readers to emulate.

So I am grasping at straws here. Do you experience the same problem if you use the User::grent module included in the core distribution? (see attachment)

Thank you very much.

-- James E Keenan (jkeenan@cpan.org)

p5pRT commented 7 years ago

From @jkeenan

usergrent.pl

p5pRT commented 7 years ago

From asper@tagan.ru

using the User::grent module\, the grant also causes a hang.

I ran the test script that you sent - it hangs.

To verify\, you really need a library of libnss and a postgres database

x2go server is not needed

I also checked this script in ubuntu with the included libnsss library there\, too\, hangs

27.10.2017 16:41\, James E Keenan via RT Ð¿Ð¸ÑÐµÑ:

On Thu\, 26 Oct 2017 03:52:19 GMT\, asper@tagan.ru wrote:

23.10.2017 23:26\, James E Keenan via RT Ð¿Ð¸ÑÐµÑ:

On Mon\, 23 Oct 2017 10:55:44 GMT\, asper@tagan.ru wrote:

This is a bug report for perl from asper@tagan.ru\, generated with the help of perlbug 1.40 running under perl 5.24.3.

----------------------------------------------------------------- [Please describe your issue here] perl function getgrent not worked in perl higer 5.20.x if enabled sys-auth/libnss-pgsql library if the groups are taken from the file\, then everything is fine\, and if the groups are taken from the database\, then the getgent function hangs

I prepared a simple test script to check this perl -e 'while ($a =getgrent) {print $a . "\n";}' this script hangs if it is enabled to take groups and users from the database\, this error is absent in the version 5.20 perl and below

Do you get any output at all if it is enable to take groups and users from the database? There is no output\, the script hangs (infinite loop?) The execution of the script can be interrupted by ^Ð¡.

We use the x2go server\, when upgrading the pearl above 5.20 clients can not connect to the server. Traced the function on which the client connection hangs - it turned out to be a gettent. After that\, I checked on other versions of perl 5.22\, 5.24\, 5.26 on all this function with the enabled livens hangs.

my nsswitch config file cat /etc/nsswitch.conf # /etc/nsswitch.conf: # $Header: /var/cvsroot/gentoo/src/patchsets/glibc/extra/etc/nsswitch.conf\,v 1.1 2006/09/29 23:52:23 vapier Exp $

group: pgsql files passwd: pgsql files shadow: pgsql files

#passwd: compat #shadow: compat #group: compat

# passwd: db files nis # shadow: db files nis # group: db files nis

hosts: files dns networks: files dns

services: db files protocols: db files rpc: db files ethers: db files netmasks: files netgroup: files bootparams: files

automount: files aliases: files

system utils getent group - work fine

This is going to be difficult for us to debug because there are several factors --- the x2go server\, the libnss-pgsql library\, the use of a database for NSS -- which are outside the scope of the Perl 5 core distribution and which will be difficult for our readers to emulate.

So I am grasping at straws here. Do you experience the same problem if you use the User::grent module included in the core distribution? (see attachment)

Thank you very much.

-- Regards\, Michael A. Manerko

Megalink Company\, Engineer 318\, Chehova street\, Taganrog\, Russia\, 347932 tel work: +7 8634 431431 (ext 159) tel mobile: +7 999 6939428 sip: 159@tagan.ru www.tagan.ru

p5pRT commented 7 years ago

From @jkeenan

On Sat\, 28 Oct 2017 22:25:19 GMT\, asper@tagan.ru wrote:

using the User::grent module\, the grant also causes a hang.

I ran the test script that you sent - it hangs.

To verify\, you really need a library of libnss and a postgres database

x2go server is not needed

I also checked this script in ubuntu with the included libnsss library there\, too\, hangs

Could you clarify what you mean exactly by that? Which script is "this script"? When you refer to "the included libnss library"\, are you referring\, say\, to libnss3? Or to something else?

I ask this because if we can demonstrate a problem with libnss (of some sort) not connected to PostgreSQL\, then we may have a better handle on the problem.

Thank you very much.

-- James E Keenan (jkeenan@cpan.org)

p5pRT commented 7 years ago

From asper@tagan.ru

Under the script\, I meant

perl -e 'while ($a =getgrent) {print $a . "\n";}'

AND

# perl use strict; use warnings; use 5.10.1; use User::grent;

while (my $y = getgrent()) { say join('|' => ( $y->name\, $y->passwd\, $y->gid\, "@{$y->members}"\, ) ); }

I do not know how to get hung without a postgres database

for testing\, I tried to use another library nss-userfiles with it the function getgrent does not hang

I am attaching two trace files. One trace of the execution of the perl script. The second system utility.

29.10.2017 03:40\, James E Keenan via RT Ð¿Ð¸ÑÐµÑ:

On Sat\, 28 Oct 2017 22:25:19 GMT\, asper@tagan.ru wrote:

using the User::grent module\, the grant also causes a hang.

I ran the test script that you sent - it hangs.

To verify\, you really need a library of libnss and a postgres database

x2go server is not needed

I also checked this script in ubuntu with the included libnsss library there\, too\, hangs

Could you clarify what you mean exactly by that? Which script is "this script"? When you refer to "the included libnss library"\, are you referring\, say\, to libnss3? Or to something else?

I ask this because if we can demonstrate a problem with libnss (of some sort) not connected to PostgreSQL\, then we may have a better handle on the problem.

Thank you very much.

-- Regards\, Michael A. Manerko

Megalink Company\, Engineer 318\, Chehova street\, Taganrog\, Russia\, 347932 tel work: +7 8634 431431 (ext 159) tel mobile: +7 999 6939428 sip: 159@tagan.ru www.tagan.ru

p5pRT commented 7 years ago

From asper@tagan.ru

gbase ~ # strace getent group execve("/usr/bin/getent"\, ["getent"\, "group"]\, [/* 32 vars */]) = 0 brk(NULL) = 0x15c4000 mmap(NULL\, 4096\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_ANONYMOUS\, -1\, 0) = 0x7f57e034c000 access("/etc/ld.so.preload"\, R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache"\, O_RDONLY|O_CLOEXEC) = 3 fstat(3\, {st_mode=S_IFREG|0644\, st_size=33484\, ...}) = 0 mmap(NULL\, 33484\, PROT_READ\, MAP_PRIVATE\, 3\, 0) = 0x7f57e0343000 close(3) = 0 open("/lib64/libc.so.6"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\t\2\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=1689416\, ...}) = 0 mmap(NULL\, 3796544\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7f57dfd8b000 mprotect(0x7f57dff20000\, 2097152\, PROT_NONE) = 0 mmap(0x7f57e0120000\, 24576\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x195000) = 0x7f57e0120000 mmap(0x7f57e0126000\, 15936\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS\, -1\, 0) = 0x7f57e0126000 close(3) = 0 mmap(NULL\, 4096\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_ANONYMOUS\, -1\, 0) = 0x7f57e0342000 mmap(NULL\, 4096\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_ANONYMOUS\, -1\, 0) = 0x7f57e0341000 mmap(NULL\, 4096\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_ANONYMOUS\, -1\, 0) = 0x7f57e0340000 arch_prctl(ARCH_SET_FS\, 0x7f57e0341700) = 0 mprotect(0x7f57e0120000\, 16384\, PROT_READ) = 0 mprotect(0x604000\, 4096\, PROT_READ) = 0 mprotect(0x7f57e034d000\, 4096\, PROT_READ) = 0 munmap(0x7f57e0343000\, 33484) = 0 brk(NULL) = 0x15c4000 brk(0x15e5000) = 0x15e5000 open("/usr/lib64/locale/locale-archive"\, O_RDONLY|O_CLOEXEC) = 3 fstat(3\, {st_mode=S_IFREG|0644\, st_size=2916416\, ...}) = 0 mmap(NULL\, 2916416\, PROT_READ\, MAP_PRIVATE\, 3\, 0) = 0x7f57dfac2000 close(3) = 0 open("/etc/nsswitch.conf"\, O_RDONLY|O_CLOEXEC) = 3 fstat(3\, {st_mode=S_IFREG|0644\, st_size=646\, ...}) = 0 read(3\, "# /etc/nsswitch.conf:\n# $Header:"...\, 4096) = 646 read(3\, ""\, 4096) = 0 close(3) = 0 open("/etc/ld.so.cache"\, O_RDONLY|O_CLOEXEC) = 3 fstat(3\, {st_mode=S_IFREG|0644\, st_size=33484\, ...}) = 0 mmap(NULL\, 33484\, PROT_READ\, MAP_PRIVATE\, 3\, 0) = 0x7f57e0343000 close(3) = 0 open("/usr/lib64/libnss_pgsql.so.2"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@\36\0\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=26872\, ...}) = 0 mmap(NULL\, 2123752\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7f57df8bb000 mprotect(0x7f57df8c1000\, 2093056\, PROT_NONE) = 0 mmap(0x7f57dfac0000\, 8192\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x5000) = 0x7f57dfac0000 close(3) = 0 open("/usr/lib64/libpq.so.5"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000\213\0\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=180088\, ...}) = 0 mmap(NULL\, 2275488\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7f57df68f000 mprotect(0x7f57df6b8000\, 2093056\, PROT_NONE) = 0 mmap(0x7f57df8b7000\, 16384\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x28000) = 0x7f57df8b7000 close(3) = 0 open("/usr/lib64/postgresql-9.3/lib64/tls/x86_64/libssl.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/usr/lib64/postgresql-9.3/lib64/tls/x86_64"\, 0x7ffdbc9489a0) = -1 ENOENT (No such file or directory) open("/usr/lib64/postgresql-9.3/lib64/tls/libssl.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/usr/lib64/postgresql-9.3/lib64/tls"\, 0x7ffdbc9489a0) = -1 ENOENT (No such file or directory) open("/usr/lib64/postgresql-9.3/lib64/x86_64/libssl.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/usr/lib64/postgresql-9.3/lib64/x86_64"\, 0x7ffdbc9489a0) = -1 ENOENT (No such file or directory) open("/usr/lib64/postgresql-9.3/lib64/libssl.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/usr/lib64/postgresql-9.3/lib64"\, {st_mode=S_IFDIR|0755\, st_size=4096\, ...}) = 0 open("/usr/lib64/libssl.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\217\1\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0555\, st_size=432856\, ...}) = 0 mmap(NULL\, 2528496\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7f57df425000 mprotect(0x7f57df485000\, 2097152\, PROT_NONE) = 0 mmap(0x7f57df685000\, 40960\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x60000) = 0x7f57df685000 close(3) = 0 open("/usr/lib64/postgresql-9.3/lib64/libcrypto.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/usr/lib64/libcrypto.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\344\5\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0555\, st_size=2007880\, ...}) = 0 mmap(NULL\, 4118296\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7f57df037000 mprotect(0x7f57df1fa000\, 2097152\, PROT_NONE) = 0 mmap(0x7f57df3fa000\, 159744\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x1c3000) = 0x7f57df3fa000 mmap(0x7f57df421000\, 14104\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS\, -1\, 0) = 0x7f57df421000 close(3) = 0 open("/lib64/libdl.so.2"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p\16\0\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=14344\, ...}) = 0 mmap(NULL\, 2109712\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7f57dee33000 mprotect(0x7f57dee35000\, 2097152\, PROT_NONE) = 0 mmap(0x7f57df035000\, 8192\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x2000) = 0x7f57df035000 close(3) = 0 open("/lib64/libz.so.1"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260%\0\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=92416\, ...}) = 0 mmap(NULL\, 2187680\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7f57dec1c000 mprotect(0x7f57dec32000\, 2093056\, PROT_NONE) = 0 mmap(0x7f57dee31000\, 8192\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x15000) = 0x7f57dee31000 close(3) = 0 mprotect(0x7f57dee31000\, 4096\, PROT_READ) = 0 mprotect(0x7f57df035000\, 4096\, PROT_READ) = 0 mprotect(0x7f57df3fa000\, 114688\, PROT_READ) = 0 mprotect(0x7f57df685000\, 16384\, PROT_READ) = 0 mprotect(0x7f57df8b7000\, 8192\, PROT_READ) = 0 mprotect(0x7f57dfac0000\, 4096\, PROT_READ) = 0 munmap(0x7f57e0343000\, 33484) = 0 open("/etc/nss-pgsql.conf"\, O_RDONLY) = 3 fstat(3\, {st_mode=S_IFREG|0644\, st_size=482\, ...}) = 0 read(3\, "connectionstring = hostaddr=10.5"...\, 4096) = 482 read(3\, ""\, 4096) = 0 close(3) = 0 socket(AF_INET\, SOCK_STREAM\, IPPROTO_IP) = 3 setsockopt(3\, SOL_TCP\, TCP_NODELAY\, [1]\, 4) = 0 fcntl(3\, F_SETFL\, O_RDONLY|O_NONBLOCK) = 0 fcntl(3\, F_SETFD\, FD_CLOEXEC) = 0 setsockopt(3\, SOL_SOCKET\, SO_KEEPALIVE\, [1]\, 4) = 0 connect(3\, {sa_family=AF_INET\, sin_port=htons(5432)\, sin_addr=inet_addr("10.55.55.18")}\, 16) = -1 EINPROGRESS (Operation now in progress) poll([{fd=3\, events=POLLOUT|POLLERR}]\, 1\, 2000) = 1 ([{fd=3\, revents=POLLOUT}]) getsockopt(3\, SOL_SOCKET\, SO_ERROR\, [0]\, [4]) = 0 getsockname(3\, {sa_family=AF_INET\, sin_port=htons(47217)\, sin_addr=inet_addr("10.55.55.94")}\, [128->16]) = 0 poll([{fd=3\, events=POLLOUT|POLLERR}]\, 1\, 2000) = 1 ([{fd=3\, revents=POLLOUT}]) sendto(3\, "\0\0\0 \0\3\0\0user\0libnss\0database\0i\0\0"\, 32\, MSG_NOSIGNAL\, NULL\, 0) = 32 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, 2000) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "R\0\0\0\f\0\0\0\5\335\343\202j"\, 16384\, 0\, NULL\, NULL) = 13 sendto(3\, "p\0\0\0(md58c5ce3c0523bf78989929cc7"...\, 41\, MSG_NOSIGNAL\, NULL\, 0) = 41 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, 2000) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "R\0\0\0\10\0\0\0\0S\0\0\0\26application_name\0\0"...\, 16384\, 0\, NULL\, NULL) = 318 sendto(3\, "Q\0\0\0\26BEGIN TRANSACTION\0"\, 23\, MSG_NOSIGNAL\, NULL\, 0) = 23 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "C\0\0\0\nBEGIN\0Z\0\0\0\5T"\, 16384\, 0\, NULL\, NULL) = 17 sendto(3\, "Q\0\0\0lDECLARE nss_pgsql_internal_"...\, 109\, MSG_NOSIGNAL\, NULL\, 0) = 109 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "C\0\0\0\23DECLARE CURSOR\0Z\0\0\0\5T"\, 16384\, 0\, NULL\, NULL) = 26 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 131 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 82 fstat(1\, {st_mode=S_IFCHR|0622\, st_rdev=makedev(136\, 0)\, ...}) = 0 write(1\, "skihead::5062:skihead\n"\, 22skihead::5062:skihead ) = 22 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 128 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 156 write(1\, "sudo::1001:asper\,vetaly\,feo\,fath"...\, 43sudo::1001:asper\,vetaly\,feo\,father\,sem\,mik ) = 43 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 127 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 78 write(1\, "feo::1029:feo\n"\, 14feo::1029:feo ) = 14 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 128 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 79 write(1\, "tuxw::5112:tuxw\n"\, 16tuxw::5112:tuxw ) = 16 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 129 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 80 write(1\, "kt315::5110:kt315\n"\, 18kt315::5110:kt315 ) = 18 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 129 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 80 write(1\, "asper::5019:asper\n"\, 18asper::5019:asper ) = 18 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 125 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 93\, MSG_NOSIGNAL\, NULL\, 0) = 93 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 110 write(1\, "root::0:dump\,root\,admin\n"\, 24root::0:dump\,root\,admin ) = 24 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 127 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 78 write(1\, "alx::5073:alx\n"\, 14alx::5073:alx ) = 14 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 130 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 81 write(1\, "father::3013:father\n"\, 20father::3013:father ) = 20 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 127 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 94\, MSG_NOSIGNAL\, NULL\, 0) = 94 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 206 write(1\, "wheel::10:father\,kt315\,sem\,root\,"...\, 62wheel::10:father\,kt315\,sem\,root\,mik\,feo\,admin\,master_gt\,asper ) = 62 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 127 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 78 write(1\, "aaa::1333:aaa\n"\, 14aaa::1333:aaa ) = 14 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 130 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 81 write(1\, "garret::3011:garret\n"\, 20garret::3011:garret ) = 20 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 133 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 115 write(1\, "nagioscmd::3005:nagios\,father\,ap"...\, 37nagioscmd::3005:nagios\,father\,apache ) = 37 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 129 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 80 write(1\, "drlex::5028:drlex\n"\, 18drlex::5028:drlex ) = 18 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 127 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 78 write(1\, "sem::1040:sem\n"\, 14sem::1040:sem ) = 14 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 133 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 273 write(1\, "mlsupport::1018:dashochek30\,maru"...\, 104mlsupport::1018:dashochek30\,marusya\,alx\,vetaly\,deduhm\,drlex\,shabby\,firstdan\,kt315\,dubochek\,anton\,garret ) = 104 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 130 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 114 write(1\, "nagios::3004:asper\,nagios\,father"...\, 33nagios::3004:asper\,nagios\,father ) = 33 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 133 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 84 write(1\, "master_gt::5119:master_gt\n"\, 26master_gt::5119:master_gt ) = 26 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 130 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 81 write(1\, "vetaly::1008:vetaly\n"\, 20vetaly::1008:vetaly ) = 20 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 132 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 83 write(1\, "firstdan::1027:firstdan\n"\, 24firstdan::1027:firstdan ) = 24 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 129 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 97 write(1\, "anton::1026:anton\,sysadm\n"\, 25anton::1026:anton\,sysadm ) = 25 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 127 sendto(3\, "P\0\0\0002\0SELECT * from nss_getgroup"...\, 96\, MSG_NOSIGNAL\, NULL\, 0) = 96 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "1\0\0\0\0042\0\0\0\4T\0\0\0!\0\1username\0\0\0\0\0\0\0"...\, 16384\, 0\, NULL\, NULL) = 78 write(1\, "mik::1003:mik\n"\, 14mik::1003:mik ) = 14 sendto(3\, "Q\0\0\0001FETCH FROM nss_pgsql_intern"...\, 50\, MSG_NOSIGNAL\, NULL\, 0) = 50 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "T\0\0\0Q\0\3groupname\0\0\0\0\0\0\0\0\0\0\31\377\377\377\377\377"...\, 16384\, 0\, NULL\, NULL) = 101 open("/etc/ld.so.cache"\, O_RDONLY|O_CLOEXEC) = 4 fstat(4\, {st_mode=S_IFREG|0644\, st_size=33484\, ...}) = 0 mmap(NULL\, 33484\, PROT_READ\, MAP_PRIVATE\, 4\, 0) = 0x7f57e0343000 close(4) = 0 open("/lib64/libnss_files.so.2"\, O_RDONLY|O_CLOEXEC) = 4 read(4\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000\"\0\0\0\0\0\0"...\, 832) = 832 fstat(4\, {st_mode=S_IFREG|0755\, st_size=43216\, ...}) = 0 mmap(NULL\, 2164536\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 4\, 0) = 0x7f57dea0b000 mprotect(0x7f57dea15000\, 2093056\, PROT_NONE) = 0 mmap(0x7f57dec14000\, 8192\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 4\, 0x9000) = 0x7f57dec14000 mmap(0x7f57dec16000\, 22328\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS\, -1\, 0) = 0x7f57dec16000 close(4) = 0 mprotect(0x7f57dec14000\, 4096\, PROT_READ) = 0 munmap(0x7f57e0343000\, 33484) = 0 open("/etc/group"\, O_RDONLY|O_CLOEXEC) = 4 fstat(4\, {st_mode=S_IFREG|0644\, st_size=631\, ...}) = 0 read(4\, "root:x:0:root\nbin:x:1:root\,bin\,d"...\, 4096) = 631 write(1\, "root:x:0:root\n"\, 14root:x:0:root ) = 14 write(1\, "bin:x:1:root\,bin\,daemon\n"\, 24bin:x:1:root\,bin\,daemon ) = 24 write(1\, "daemon:x:2:root\,bin\,daemon\n"\, 27daemon:x:2:root\,bin\,daemon ) = 27 write(1\, "sys:x:3:root\,bin\,adm\n"\, 21sys:x:3:root\,bin\,adm ) = 21 write(1\, "adm:x:4:root\,adm\,daemon\n"\, 24adm:x:4:root\,adm\,daemon ) = 24 write(1\, "tty:x:5:\n"\, 9tty:x:5: ) = 9 write(1\, "disk:x:6:root\,adm\n"\, 18disk:x:6:root\,adm ) = 18 write(1\, "lp:x:7:lp\n"\, 10lp:x:7:lp ) = 10 write(1\, "mem:x:8:\n"\, 9mem:x:8: ) = 9 write(1\, "kmem:x:9:\n"\, 10kmem:x:9: ) = 10 write(1\, "wheel:x:10:root\n"\, 16wheel:x:10:root ) = 16 write(1\, "floppy:x:11:root\n"\, 17floppy:x:11:root ) = 17 write(1\, "news:x:13:news\n"\, 15news:x:13:news ) = 15 write(1\, "uucp:x:14:uucp\n"\, 15uucp:x:14:uucp ) = 15 write(1\, "console:x:17:\n"\, 14console:x:17: ) = 14 write(1\, "audio:x:18:\n"\, 12audio:x:18: ) = 12 write(1\, "cdrom:x:19:\n"\, 12cdrom:x:19: ) = 12 write(1\, "tape:x:26:root\n"\, 15tape:x:26:root ) = 15 write(1\, "video:x:27:root\n"\, 16video:x:27:root ) = 16 write(1\, "cdrw:x:80:\n"\, 11cdrw:x:80: ) = 11 write(1\, "usb:x:85:\n"\, 10usb:x:85: ) = 10 write(1\, "users:x:100:\n"\, 13users:x:100: ) = 13 write(1\, "portage:x:250:portage\n"\, 22portage:x:250:portage ) = 22 write(1\, "utmp:x:406:\n"\, 12utmp:x:406: ) = 12 write(1\, "nogroup:x:65533:\n"\, 17nogroup:x:65533: ) = 17 write(1\, "nobody:x:65534:\n"\, 16nobody:x:65534: ) = 16 write(1\, "man:x:15:\n"\, 10man:x:15: ) = 10 write(1\, "sshd:x:22:\n"\, 11sshd:x:22: ) = 11 write(1\, "cron:x:16:\n"\, 11cron:x:16: ) = 11 write(1\, "crontab:x:249:\n"\, 15crontab:x:249: ) = 15 write(1\, "nullmail:x:88:\n"\, 15nullmail:x:88: ) = 15 write(1\, "admin:x:1000:\n"\, 14admin:x:1000: ) = 14 write(1\, "mail:x:12:\n"\, 11mail:x:12: ) = 11 write(1\, "apache:x:81:\n"\, 13apache:x:81: ) = 13 write(1\, "nagios:x:248:icinga\n"\, 20nagios:x:248:icinga ) = 20 write(1\, "icinga:x:247:\n"\, 14icinga:x:247: ) = 14 write(1\, "mysql:x:60:\n"\, 12mysql:x:60: ) = 12 write(1\, "tcpdump:x:246:\n"\, 15tcpdump:x:246: ) = 15 write(1\, "input:x:245:\n"\, 13input:x:245: ) = 13 write(1\, "postgres:x:70:\n"\, 15postgres:x:70: ) = 15 write(1\, "postmaster:x:244:\n"\, 18postmaster:x:244: ) = 18 write(1\, "smtpd:x:25:\n"\, 12smtpd:x:25: ) = 12 write(1\, "smtpq:x:252:\n"\, 13smtpq:x:252: ) = 13 read(4\, ""\, 4096) = 0 sendto(3\, "Q\0\0\0\vCOMMIT\0"\, 12\, MSG_NOSIGNAL\, NULL\, 0) = 12 poll([{fd=3\, events=POLLIN|POLLERR}]\, 1\, -1) = 1 ([{fd=3\, revents=POLLIN}]) recvfrom(3\, "C\0\0\0\vCOMMIT\0Z\0\0\0\5I"\, 16384\, 0\, NULL\, NULL) = 18 sendto(3\, "X\0\0\0\4"\, 5\, MSG_NOSIGNAL\, NULL\, 0) = 5 close(3) = 0 close(4) = 0 exit_group(0) = ? +++ exited with 0 +++

p5pRT commented 7 years ago

From asper@tagan.ru

gbase ~ # strace perl -e 'while ($a =getgrent) {print $a . "\n";}' execve("/usr/bin/perl"\, ["perl"\, "-e"\, "while ($a =getgrent) {print $a ."...]\, [/* 32 vars */]) = 0 brk(NULL) = 0x1ad8000 mmap(NULL\, 4096\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_ANONYMOUS\, -1\, 0) = 0x7fa3c0aef000 access("/etc/ld.so.preload"\, R_OK) = -1 ENOENT (No such file or directory) open("/etc/ld.so.cache"\, O_RDONLY|O_CLOEXEC) = 3 fstat(3\, {st_mode=S_IFREG|0644\, st_size=33484\, ...}) = 0 mmap(NULL\, 33484\, PROT_READ\, MAP_PRIVATE\, 3\, 0) = 0x7fa3c0ae6000 close(3) = 0 open("/usr/lib64/libperl.so.5.24"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260m\3\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=1963056\, ...}) = 0 mmap(NULL\, 4062392\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7fa3c04ed000 mprotect(0x7fa3c06c2000\, 2097152\, PROT_NONE) = 0 mmap(0x7fa3c08c2000\, 40960\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x1d5000) = 0x7fa3c08c2000 mmap(0x7fa3c08cc000\, 3256\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS\, -1\, 0) = 0x7fa3c08cc000 close(3) = 0 open("/lib64/libc.so.6"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0`\t\2\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=1689416\, ...}) = 0 mmap(NULL\, 3796544\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7fa3c014e000 mprotect(0x7fa3c02e3000\, 2097152\, PROT_NONE) = 0 mmap(0x7fa3c04e3000\, 24576\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x195000) = 0x7fa3c04e3000 mmap(0x7fa3c04e9000\, 15936\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS\, -1\, 0) = 0x7fa3c04e9000 close(3) = 0 mmap(NULL\, 4096\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_ANONYMOUS\, -1\, 0) = 0x7fa3c0ae5000 open("/lib64/libpthread.so.0"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000a\0\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=133712\, ...}) = 0 mmap(NULL\, 2208872\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7fa3bff32000 mprotect(0x7fa3bff49000\, 2093056\, PROT_NONE) = 0 mmap(0x7fa3c0148000\, 8192\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x16000) = 0x7fa3c0148000 mmap(0x7fa3c014a000\, 13416\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS\, -1\, 0) = 0x7fa3c014a000 close(3) = 0 open("/lib64/libdl.so.2"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p\16\0\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=14344\, ...}) = 0 mmap(NULL\, 2109712\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7fa3bfd2e000 mprotect(0x7fa3bfd30000\, 2097152\, PROT_NONE) = 0 mmap(0x7fa3bff30000\, 8192\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x2000) = 0x7fa3bff30000 close(3) = 0 open("/lib64/libm.so.6"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300U\0\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=1067088\, ...}) = 0 mmap(NULL\, 3162416\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7fa3bfa29000 mprotect(0x7fa3bfb2d000\, 2093056\, PROT_NONE) = 0 mmap(0x7fa3bfd2c000\, 8192\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x103000) = 0x7fa3bfd2c000 close(3) = 0 open("/lib64/libcrypt.so.1"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\320\v\0\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=34840\, ...}) = 0 mmap(NULL\, 4096\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_ANONYMOUS\, -1\, 0) = 0x7fa3c0ae4000 mmap(NULL\, 2318880\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7fa3bf7f2000 mprotect(0x7fa3bf7fa000\, 2093056\, PROT_NONE) = 0 mmap(0x7fa3bf9f9000\, 8192\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x7000) = 0x7fa3bf9f9000 mmap(0x7fa3bf9fb000\, 184864\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS\, -1\, 0) = 0x7fa3bf9fb000 close(3) = 0 mmap(NULL\, 4096\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_ANONYMOUS\, -1\, 0) = 0x7fa3c0ae3000 mmap(NULL\, 4096\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_ANONYMOUS\, -1\, 0) = 0x7fa3c0ae2000 mmap(NULL\, 4096\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_ANONYMOUS\, -1\, 0) = 0x7fa3c0ae1000 arch_prctl(ARCH_SET_FS\, 0x7fa3c0ae2700) = 0 mprotect(0x7fa3c04e3000\, 16384\, PROT_READ) = 0 mprotect(0x7fa3bf9f9000\, 4096\, PROT_READ) = 0 mprotect(0x7fa3bfd2c000\, 4096\, PROT_READ) = 0 mprotect(0x7fa3bff30000\, 4096\, PROT_READ) = 0 mprotect(0x7fa3c0148000\, 4096\, PROT_READ) = 0 mprotect(0x7fa3c08c2000\, 24576\, PROT_READ) = 0 mprotect(0x601000\, 4096\, PROT_READ) = 0 mprotect(0x7fa3c0af0000\, 4096\, PROT_READ) = 0 munmap(0x7fa3c0ae6000\, 33484) = 0 set_tid_address(0x7fa3c0ae29d0) = 5856 set_robust_list(0x7fa3c0ae29e0\, 24) = 0 rt_sigaction(SIGRTMIN\, {sa_handler=0x7fa3bff37bc0\, sa_mask=[]\, sa_flags=SA_RESTORER|SA_SIGINFO\, sa_restorer=0x7fa3bff42f90}\, NULL\, 8) = 0 rt_sigaction(SIGRT_1\, {sa_handler=0x7fa3bff37c50\, sa_mask=[]\, sa_flags=SA_RESTORER|SA_RESTART|SA_SIGINFO\, sa_restorer=0x7fa3bff42f90}\, NULL\, 8) = 0 rt_sigprocmask(SIG_UNBLOCK\, [RTMIN RT_1]\, NULL\, 8) = 0 getrlimit(RLIMIT_STACK\, {rlim_cur=8192*1024\, rlim_max=RLIM64_INFINITY}) = 0 rt_sigaction(SIGFPE\, {sa_handler=SIG_IGN\, sa_mask=[FPE]\, sa_flags=SA_RESTORER|SA_RESTART\, sa_restorer=0x7fa3c01812a0}\, {sa_handler=SIG_DFL\, sa_mask=[]\, sa_flags=0}\, 8) = 0 brk(NULL) = 0x1ad8000 brk(0x1af9000) = 0x1af9000 getuid() = 0 geteuid() = 0 getgid() = 0 getegid() = 0 open("/usr/lib64/locale/locale-archive"\, O_RDONLY|O_CLOEXEC) = 3 fstat(3\, {st_mode=S_IFREG|0644\, st_size=2916416\, ...}) = 0 mmap(NULL\, 2916416\, PROT_READ\, MAP_PRIVATE\, 3\, 0) = 0x7fa3bf529000 close(3) = 0 open("/dev/urandom"\, O_RDONLY) = 3 read(3\, "\372\245\206\6"\, 4) = 4 close(3) = 0 readlink("/proc/self/exe"\, "/usr/bin/perl"\, 4095) = 13 stat("/usr/local/lib64/perl5/5.24.2/x86_64-linux"\, 0x7ffdb8b02970) = -1 ENOENT (No such file or directory) stat("/usr/local/lib64/perl5/5.24.2"\, 0x7ffdb8b02970) = -1 ENOENT (No such file or directory) stat("/usr/local/lib64/perl5/5.24.1/x86_64-linux"\, 0x7ffdb8b02970) = -1 ENOENT (No such file or directory) stat("/usr/local/lib64/perl5/5.24.1"\, 0x7ffdb8b02970) = -1 ENOENT (No such file or directory) stat("/usr/local/lib64/perl5/5.24.0/x86_64-linux"\, 0x7ffdb8b02970) = -1 ENOENT (No such file or directory) stat("/usr/local/lib64/perl5/5.24.0"\, 0x7ffdb8b02970) = -1 ENOENT (No such file or directory) stat("/usr/lib64/perl5/vendor_perl/5.24.2/x86_64-linux"\, 0x7ffdb8b02970) = -1 ENOENT (No such file or directory) stat("/usr/lib64/perl5/vendor_perl/5.24.2"\, 0x7ffdb8b02970) = -1 ENOENT (No such file or directory) stat("/usr/lib64/perl5/vendor_perl/5.24.1/x86_64-linux"\, 0x7ffdb8b02970) = -1 ENOENT (No such file or directory) stat("/usr/lib64/perl5/vendor_perl/5.24.1"\, 0x7ffdb8b02970) = -1 ENOENT (No such file or directory) stat("/usr/lib64/perl5/vendor_perl/5.24.0/x86_64-linux"\, 0x7ffdb8b02970) = -1 ENOENT (No such file or directory) stat("/usr/lib64/perl5/vendor_perl/5.24.0"\, 0x7ffdb8b02970) = -1 ENOENT (No such file or directory) ioctl(0\, TCGETS\, {B38400 opost isig icanon echo ...}) = 0 lseek(0\, 0\, SEEK_CUR) = -1 ESPIPE (Illegal seek) ioctl(1\, TCGETS\, {B38400 opost isig icanon echo ...}) = 0 lseek(1\, 0\, SEEK_CUR) = -1 ESPIPE (Illegal seek) ioctl(2\, TCGETS\, {B38400 opost isig icanon echo ...}) = 0 lseek(2\, 0\, SEEK_CUR) = -1 ESPIPE (Illegal seek) open("/dev/null"\, O_RDONLY) = 3 ioctl(3\, TCGETS\, 0x7ffdb8b028d0) = -1 ENOTTY (Inappropriate ioctl for device) lseek(3\, 0\, SEEK_CUR) = 0 fcntl(3\, F_SETFD\, FD_CLOEXEC) = 0 fstat(3\, {st_mode=S_IFCHR|0666\, st_rdev=makedev(1\, 3)\, ...}) = 0 getuid() = 0 geteuid() = 0 getgid() = 0 getegid() = 0 rt_sigaction(SIGCHLD\, NULL\, {sa_handler=SIG_DFL\, sa_mask=[]\, sa_flags=0}\, 8) = 0 close(3) = 0 brk(0x1b1a000) = 0x1b1a000 open("/etc/nsswitch.conf"\, O_RDONLY|O_CLOEXEC) = 3 fstat(3\, {st_mode=S_IFREG|0644\, st_size=646\, ...}) = 0 read(3\, "# /etc/nsswitch.conf:\n# $Header:"...\, 4096) = 646 read(3\, ""\, 4096) = 0 close(3) = 0 open("/etc/ld.so.cache"\, O_RDONLY|O_CLOEXEC) = 3 fstat(3\, {st_mode=S_IFREG|0644\, st_size=33484\, ...}) = 0 mmap(NULL\, 33484\, PROT_READ\, MAP_PRIVATE\, 3\, 0) = 0x7fa3c0ae6000 close(3) = 0 open("/usr/lib64/libnss_pgsql.so.2"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@\36\0\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=26872\, ...}) = 0 mmap(NULL\, 2123752\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7fa3bf322000 mprotect(0x7fa3bf328000\, 2093056\, PROT_NONE) = 0 mmap(0x7fa3bf527000\, 8192\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x5000) = 0x7fa3bf527000 close(3) = 0 open("/usr/lib64/libpq.so.5"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0000\213\0\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=180088\, ...}) = 0 mmap(NULL\, 2275488\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7fa3bf0f6000 mprotect(0x7fa3bf11f000\, 2093056\, PROT_NONE) = 0 mmap(0x7fa3bf31e000\, 16384\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x28000) = 0x7fa3bf31e000 close(3) = 0 open("/usr/lib64/postgresql-9.3/lib64/tls/x86_64/libssl.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/usr/lib64/postgresql-9.3/lib64/tls/x86_64"\, 0x7ffdb8b01c40) = -1 ENOENT (No such file or directory) open("/usr/lib64/postgresql-9.3/lib64/tls/libssl.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/usr/lib64/postgresql-9.3/lib64/tls"\, 0x7ffdb8b01c40) = -1 ENOENT (No such file or directory) open("/usr/lib64/postgresql-9.3/lib64/x86_64/libssl.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/usr/lib64/postgresql-9.3/lib64/x86_64"\, 0x7ffdb8b01c40) = -1 ENOENT (No such file or directory) open("/usr/lib64/postgresql-9.3/lib64/libssl.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) stat("/usr/lib64/postgresql-9.3/lib64"\, {st_mode=S_IFDIR|0755\, st_size=4096\, ...}) = 0 open("/usr/lib64/libssl.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\300\217\1\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0555\, st_size=432856\, ...}) = 0 mmap(NULL\, 2528496\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7fa3bee8c000 mprotect(0x7fa3beeec000\, 2097152\, PROT_NONE) = 0 mmap(0x7fa3bf0ec000\, 40960\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x60000) = 0x7fa3bf0ec000 close(3) = 0 open("/usr/lib64/postgresql-9.3/lib64/libcrypto.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) open("/usr/lib64/libcrypto.so.1.0.0"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0\344\5\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0555\, st_size=2007880\, ...}) = 0 mmap(NULL\, 4118296\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7fa3bea9e000 mprotect(0x7fa3bec61000\, 2097152\, PROT_NONE) = 0 mmap(0x7fa3bee61000\, 159744\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x1c3000) = 0x7fa3bee61000 mmap(0x7fa3bee88000\, 14104\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS\, -1\, 0) = 0x7fa3bee88000 close(3) = 0 open("/lib64/libz.so.1"\, O_RDONLY|O_CLOEXEC) = 3 read(3\, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\260%\0\0\0\0\0\0"...\, 832) = 832 fstat(3\, {st_mode=S_IFREG|0755\, st_size=92416\, ...}) = 0 mmap(NULL\, 2187680\, PROT_READ|PROT_EXEC\, MAP_PRIVATE|MAP_DENYWRITE\, 3\, 0) = 0x7fa3be887000 mprotect(0x7fa3be89d000\, 2093056\, PROT_NONE) = 0 mmap(0x7fa3bea9c000\, 8192\, PROT_READ|PROT_WRITE\, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE\, 3\, 0x15000) = 0x7fa3bea9c000 close(3) = 0 mprotect(0x7fa3bea9c000\, 4096\, PROT_READ) = 0 mprotect(0x7fa3bee61000\, 114688\, PROT_READ) = 0 mprotect(0x7fa3bf0ec000\, 16384\, PROT_READ) = 0 mprotect(0x7fa3bf31e000\, 8192\, PROT_READ) = 0 mprotect(0x7fa3bf527000\, 4096\, PROT_READ) = 0 munmap(0x7fa3c0ae6000\, 33484) = 0 futex(0x7fa3bf528260\, FUTEX_WAIT_PRIVATE\, 2\, NULL^Cstrace: Process 5856 detached \<detached ...> gbase ~ #

p5pRT commented 7 years ago

From asper@tagan.ru

I want to inform you that I found a solution to the problem.

I rebuilt in the debugging mode\, glibc\, linss-pgsgl\, perl 5.24 and through the tracer found a function in which hangs.

This is a function in the libnss_pgsqll library.

after changing the lock type in a libnss_pgsql with MUTEX to RECURSIVE_MUTEX\, the getgrent function stops hanging.

however I still do not understand what changed in the perl after version 5.20 and caused the getgrent to hang

30.10.2017 15:09\, ÐÐ¸ÑÐ°Ð¸Ð» ÐÐ°Ð½ÐµÑÐºÐ¾ Ð¿Ð¸ÑÐµÑ:

Under the script\, I meant

perl -e 'while ($a =getgrent) {print $a . "\n";}'

AND

# perl use strict; use warnings; use 5.10.1; use User::grent;

while (my $y = getgrent()) { say join('|' => ( $y->name\, $y->passwd\, $y->gid\, "@{$y->members}"\, ) ); }

I do not know how to get hung without a postgres database

for testing\, I tried to use another library nss-userfiles with it the function getgrent does not hang

I am attaching two trace files. One trace of the execution of the perl script. The second system utility.

29.10.2017 03:40\, James E Keenan via RT Ð¿Ð¸ÑÐµÑ:

On Sat\, 28 Oct 2017 22:25:19 GMT\, asper@tagan.ru wrote:

using the User::grent module\, the grant also causes a hang.

I ran the test script that you sent - it hangs.

To verify\, you really need a library of libnss and a postgres database

x2go server is not needed

I also checked this script in ubuntu with the included libnsss library there\, too\, hangs

Could you clarify what you mean exactly by that? Which script is "this script"? When you refer to "the included libnss library"\, are you referring\, say\, to libnss3? Or to something else?

I ask this because if we can demonstrate a problem with libnss (of some sort) not connected to PostgreSQL\, then we may have a better handle on the problem.

Thank you very much.

-- Regards\, Michael A. Manerko

Megalink Company\, Engineer 318\, Chehova street\, Taganrog\, Russia\, 347932 tel work: +7 8634 431431 (ext 159) tel mobile: +7 999 6939428 sip: 159@tagan.ru www.tagan.ru

p5pRT commented 7 years ago

From @jkeenan

On 11/01/2017 09:49 AM\, ÐÐ¸ÑÐ°Ð¸Ð» ÐÐ°Ð½ÐµÑÐºÐ¾ wrote:

I want to inform you that I found a solution to the problem.

I rebuilt in the debugging mode\, glibc\, linss-pgsgl\, perl 5.24 and through the tracer found a function in which hangs.

Would you be able to post that trace and your work-around? Even if we can't track down the perl problem it would be good for future reference in case someone with expertise in linss-pgsql stumbles upon this problem.

This is a function in the libnss_pgsqll library.

after changing the lock type in a libnss_pgsql with MUTEX to RECURSIVE_MUTEX\, the getgrent function stops hanging.

however I still do not understand what changed in the perl after version 5.20 and caused the getgrent to hang

Nor do I. I couldn't see any modifications to the source code for getgrent after 5.20 (though I may not have known every place to look).

30.10.2017 15:09\, ÐÐ¸ÑÐ°Ð¸Ð» ÐÐ°Ð½ÐµÑÐºÐ¾ Ð¿Ð¸ÑÐµÑ:

Under the script\, I meant

perl -e 'while ($a =getgrent) {print $a . "\n";}'

AND

# perl use strict; use warnings; use 5.10.1; use User::grent;

while (my $y = getgrent()) { say join('|' => ( $y->name\, $y->passwd\, $y->gid\, "@{$y->members}"\, ) ); }

I do not know how to get hung without a postgres database

for testing\, I tried to use another library nss-userfiles with it the function getgrent does not hang

I am attaching two trace files. One trace of the execution of the perl script. The second system utility.

29.10.2017 03:40\, James E Keenan via RT Ð¿Ð¸ÑÐµÑ:

On Sat\, 28 Oct 2017 22:25:19 GMT\, asper@tagan.ru wrote:

using the User::grent module\, the grant also causes a hang.

I ran the test script that you sent - it hangs.

To verify\, you really need a library of libnss and a postgres database

x2go server is not needed

I also checked this script in ubuntu with the included libnsss library there\, too\, hangs

Could you clarify what you mean exactly by that? Which script is "this script"? When you refer to "the included libnss library"\, are you referring\, say\, to libnss3? Or to something else?

I ask this because if we can demonstrate a problem with libnss (of some sort) not connected to PostgreSQL\, then we may have a better handle on the problem.

Thank you very much.

p5pRT commented 7 years ago

From @tonycoz

On Wed\, Nov 01\, 2017 at 04:49:05PM +0300\, ÐÐ¸ÑÐ°Ð¸Ð» ÐÐ°Ð½ÐµÑÐºÐ¾ wrote:

I want to inform you that I found a solution to the problem.

I rebuilt in the debugging mode\, glibc\, linss-pgsgl\, perl 5.24 and through the tracer found a function in which hangs.

This is a function in the libnss_pgsqll library.

after changing the lock type in a libnss_pgsql with MUTEX to RECURSIVE_MUTEX\, the getgrent function stops hanging.

however I still do not understand what changed in the perl after version 5.20 and caused the getgrent to hang

Is there any chance you switched from an unthreaded build of perl to a threaded build?

You might want to try building with -Ud_getgrent_r

Looking at the ChangeLog for libnss-pgsql2\, I see:

* Fixed bug where if you used getpwent\, then getspnam\, then getpwent you would end up hanging the application (common perl operation)

I wonder if there's a similar problem with groups.

Tony

p5pRT commented 7 years ago

From asper@tagan.ru

02.11.2017 08:55\, Tony Cook via RT Ð¿Ð¸ÑÐµÑ:

Is there any chance you switched from an unthreaded build of perl to a threaded build?

I downloaded the perl from the git repository. switched to branch 5.24 compiled with default settings

asper@a ~/INSTALL/perl $ git remote -v origin https://perl5.git.perl.org/perl.git (fetch) origin https://perl5.git.perl.org/perl.git (push) asper@a ~/INSTALL/perl $ git status ÐÐ° Ð²ÐµÑÐºÐµ maint-5.24 ÐÐ°ÑÐ° Ð²ÐµÑÐºÐ° Ð¾Ð±Ð½Ð¾Ð²Ð»ÐµÐ½Ð° Ð² ÑÐ¾Ð¾ÑÐ²ÐµÑÑÑÐ²Ð¸Ð¸ Ñ Â«origin/maint-5.24Â». Ð½ÐµÑÐµÐ³Ð¾ ÐºÐ¾Ð¼Ð¼Ð¸ÑÐ¸ÑÑ\, Ð½ÐµÑ Ð¸Ð·Ð¼ÐµÐ½ÐµÐ½Ð¸Ð¹ Ð² ÑÐ°Ð±Ð¾ÑÐµÐ¼ ÐºÐ°ÑÐ°Ð»Ð¾Ð³Ðµ

You might want to try building with -Ud_getgrent_r

I rebuild perl with ./Configure -de -Dprefix=/opt/perl5 -Ud_getgrent_r nothing will change functions hang

Looking at the ChangeLog for libnss-pgsql2\, I see:

    \* Fixed bug where if you used getpwent\, then getspnam\, then getpwent
    you would end up hanging the application \(common perl operation\)

I saw the commit described in Cgangelog libnss_pgsql2\, these fixes relate to lib_nss of the function getent_close and backend_close.

partial sequence is called when getgrent in libnss_pgsql2

... _nss_pgsql_getgrent_r __libc_lock_lock(lock); _nss_pgsql_setgrent(); __libc_lock_lock(lock); \<-- hangs here if getgrent is called from perl version greater than 5.20\, but does not hang if getgrent is called from c program like this #include \<sys/types.h> #include \<grp.h> #include \<stdio.h> void main(void) { printf ("name: %s\n"\,getgrent()->gr_name); }

I wonder if there's a similar problem with groups.

Tony

A more detailed study showed that a pearl above 5.20 hides using two functions\, getgrent and getpwent.

Here is the patch I applied to the libnss_pgsql2 library\, this patch fixes both functions \, getgrent and getpwent.

Inline Patch

```diff diff --git a/src/interface.c b/src/interface.c index 7c6475c..ced21c6 100644 --- a/src/interface.c +++ b/src/interface.c @@ -10,12 +10,13 @@ * */ +#define _GNU_SOURCE #include "nss-pgsql.h" #include #include #include -static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; +static pthread_mutex_t lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP; /* * passwd functions @@ -250,7 +251,7 @@ _nss_pgsql_getspent_r(struct spwd *result, char *buffer, { enum nss_status retval = NSS_STATUS_UNAVAIL; int lerrno = 0; - + pthread_mutex_lock(&lock); // Make sure the database is opened in case no one has called setspent() -- ```

Regards\, Michael A. Manerko

Megalink Company\, Engineer 318\, Chehova street\, Taganrog\, Russia\, 347932 tel work: +7 8634 431431 (ext 159) tel mobile: +7 999 6939428 sip: 159@tagan.ru www.tagan.ru

p5pRT commented 7 years ago

From @tonycoz

On Thu\, Nov 02\, 2017 at 01:50:57PM +0300\, ÐÐ¸ÑÐ°Ð¸Ð» ÐÐ°Ð½ÐµÑÐºÐ¾ wrote:

02.11.2017 08:55\, Tony Cook via RT Ð¿Ð¸ÑÐµÑ:

Is there any chance you switched from an unthreaded build of perl to a threaded build?

I downloaded the perl from the git repository. switched to branch 5.24 compiled with default settings

asper@a ~/INSTALL/perl $ git remote -v origin https://perl5.git.perl.org/perl.git (fetch) origin https://perl5.git.perl.org/perl.git (push) asper@a ~/INSTALL/perl $ git status ÐÐ° Ð²ÐµÑÐºÐµ maint-5.24 ÐÐ°ÑÐ° Ð²ÐµÑÐºÐ° Ð¾Ð±Ð½Ð¾Ð²Ð»ÐµÐ½Ð° Ð² ÑÐ¾Ð¾ÑÐ²ÐµÑÑÑÐ²Ð¸Ð¸ Ñ Â«origin/maint-5.24Â». Ð½ÐµÑÐµÐ³Ð¾ ÐºÐ¾Ð¼Ð¼Ð¸ÑÐ¸ÑÑ\, Ð½ÐµÑ Ð¸Ð·Ð¼ÐµÐ½ÐµÐ½Ð¸Ð¹ Ð² ÑÐ°Ð±Ð¾ÑÐµÐ¼ ÐºÐ°ÑÐ°Ð»Ð¾Ð³Ðµ

You might want to try building with -Ud_getgrent_r

I rebuild perl with ./Configure -de -Dprefix=/opt/perl5 -Ud_getgrent_r nothing will change functions hang

Ok\, thanks.

Looking at the ChangeLog for libnss-pgsql2\, I see:
    \* Fixed bug where if you used getpwent\, then getspnam\, then getpwent
    you would end up hanging the application $common perl operation$
I saw the commit described in Cgangelog libnss_pgsql2\, these fixes relate to lib_nss of the function getent_close and backend_close.

partial sequence is called when getgrent in libnss_pgsql2

... _nss_pgsql_getgrent_r __libc_lock_lock(lock); _nss_pgsql_setgrent(); __libc_lock_lock(lock); \<-- hangs here if getgrent is called from perl version greater than 5.20\, but does not hang if getgrent is called from c program like this #include \<sys/types.h> #include \<grp.h> #include \<stdio.h> void main(void) { printf ("name: %s\n"\,getgrent()->gr_name); }

I wonder if there's a similar problem with groups.

Tony

A more detailed study showed that a pearl above 5.20 hides using two functions\, getgrent and getpwent.

Here is the patch I applied to the libnss_pgsql2 library\, this patch fixes both functions \, getgrent and getpwent.

Yes\, but I can only see that lock being held if there's a bug in libnss_pgsql.

I had a look\, getgrent() (from 1.4.0) is:

enum nss_status _nss_pgsql_getgrent_r(struct group *result\, char *buffer\, size_t buflen\, int *errnop) { enum nss_status retval = NSS_STATUS_UNAVAIL;

__libc_lock_lock(lock);

// Make sure the database is opened in case no one has called setpwent() if(!backend_isopen(CONNECTION_USERGROUP)) { retval = _nss_pgsql_setgrent(); }

if(backend_isopen(CONNECTION_USERGROUP)) { retval = backend_getgrent(result\, buffer\, buflen\, errnop); } __libc_lock_unlock(lock);

return retval; }

Note the call to _nss_pgsql_setgrent() with the lock held.

enum nss_status _nss_pgsql_setgrent(void) { enum nss_status retval = NSS_STATUS_UNAVAIL;

__libc_lock_lock(lock); if(backend_open(CONNECTION_USERGROUP)) { getent_prepare("allgroups"); retval = NSS_STATUS_SUCCESS; } __libc_lock_unlock(lock);

return NSS_STATUS_SUCCESS; }

attempts to lock too\, and in the call from _nss_pgsql_getgrent_r() it will attempt to lock again.

So this appears to be a libnss_pgsql bug\, which your change to recursive locks works around.

Tony

jkeenan commented 2 years ago

Reviewing this older ticket, it appears that @tonycoz diagnosed the problem as being in an outside library. Since we haven't heard anything more in 4 years, I will take this ticket for the purpose of closing it within 7 days unless someone has a serious objection.

Thank you very much. Jim Keenan

jkeenan commented 2 years ago

Reviewing this older ticket, it appears that @tonycoz diagnosed the problem as being in an outside library. Since we haven't heard anything more in 4 years, I will take this ticket for the purpose of closing it within 7 days unless someone has a serious objection.

Thank you very much. Jim Keenan

No objections heard; closing ticket as per previous post.

Perl / perl5