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Perl 5.10.0 segfaults on Format with my variables #9219

Closed p5pRT closed 14 years ago

p5pRT commented 16 years ago

Migrated from rt.perl.org#50528 (status was 'resolved')

Searchable as RT50528$

p5pRT commented 16 years ago

From springl-perlbug@bfw-online.de

Created by springl-perlbug@bfw-online.de

Hi!

Thank you for your work on perl. Unfortunately\, perl 5.10.0 segfaults on the following program​:

============================================== sub f ($); # Comment out to get right result! sub f ($) {   my $test = $_[0];   write;   format STDOUT = @​\<\<\<\<\<\<\< $test . } f(1); f(2);

The problem is in the write statement. It only shows up in functions with a pre-declared prototype that use lexical variables in formats. Former perl versions (tested through 5.8.8) had a different problem​: They will will output "1" for f(1) as well as for f(2).

Perl Info ``` Flags: category=core severity=high Site configuration information for perl 5.10.0: Configured by springl at Mon Feb 4 15:06:18 CET 2008. Summary of my perl5 (revision 5 version 10 subversion 0) configuration: Platform: osname=linux, osvers=2.6.23-1-686-bigmem, archname=i686-linux uname='linux debian.bfw.de 2.6.23-1-686-bigmem #1 smp sun dec 23 21:43:22 cet 2007 i686 gnulinux ' config_args='' hint=recommended, useposix=true, d_sigaction=define useithreads=undef, usemultiplicity=undef useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef use64bitint=undef, use64bitall=undef, uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='cc', ccflags ='-fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64', optimize='-O2', cppflags='-fno-strict-aliasing -pipe -I/usr/local/include' ccversion='', gccversion='4.2.3 (Debian 4.2.3-1)', gccosandvers='' intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12 ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=4, prototype=define Linker and Libraries: ld='cc', ldflags =' -L/usr/local/lib' libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64 libs=-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc libc=/lib/libc-2.7.so, so=so, useshrplib=false, libperl=libperl.a gnulibc_version='2.7' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E' cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib' Locally applied patches: @INC for perl 5.10.0: /tmp/p/lib/perl5/5.10.0/i686-linux /tmp/p/lib/perl5/5.10.0 /tmp/p/lib/perl5/site_perl/5.10.0/i686-linux /tmp/p/lib/perl5/site_perl/5.10.0 . Environment for perl 5.10.0: HOME=/home/springl LANG (unset) LANGUAGE (unset) LD_LIBRARY_PATH (unset) LOGDIR (unset) PATH=/tmp/p/bin:/home/springl/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games PERL_BADLANG (unset) SHELL=/bin/bash Complete configuration data for perl 5.10.0: Author='' CONFIG='true' Date='$Date' Header='' Id='$Id' Locker='' Log='$Log' Mcc='Mcc' PATCHLEVEL='10' PERL_API_REVISION='5' PERL_API_SUBVERSION='0' PERL_API_VERSION='10' PERL_CONFIG_SH='true' PERL_REVISION='5' PERL_SUBVERSION='0' PERL_VERSION='10' RCSfile='$RCSfile' Revision='$Revision' SUBVERSION='0' Source='' State='' _a='.a' _exe='' _o='.o' afs='false' afsroot='/afs' alignbytes='4' ansi2knr='' aphostname='/bin/hostname' api_revision='5' api_subversion='0' api_version='10' api_versionstring='5.10.0' ar='ar' archlib='/tmp/p/lib/perl5/5.10.0/i686-linux' archlibexp='/tmp/p/lib/perl5/5.10.0/i686-linux' archname='i686-linux' archname64='' archobjs='' asctime_r_proto='0' awk='awk' baserev='5.0' bash='' bin='/tmp/p/bin' binexp='/tmp/p/bin' bison='bison' byacc='byacc' byteorder='1234' c='' castflags='0' cat='cat' cc='cc' cccdlflags='-fPIC' ccdlflags='-Wl,-E' ccflags='-fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64' ccflags_nolargefiles='-fno-strict-aliasing -pipe -I/usr/local/include ' ccflags_uselargefiles='-D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64' ccname='gcc' ccsymbols='' ccversion='' cf_by='springl' cf_email='springl@debian.bfw.de' cf_time='Mon Feb 4 15:06:18 CET 2008' chgrp='' chmod='chmod' chown='' clocktype='clock_t' comm='comm' compress='' config_arg0='./Configure' config_argc='0' config_args='' contains='grep' cp='cp' cpio='' cpp='cpp' cpp_stuff='42' cppccsymbols='' cppflags='-fno-strict-aliasing -pipe -I/usr/local/include' cpplast='-' cppminus='-' cpprun='cc -E' cppstdin='cc -E' cppsymbols='_FILE_OFFSET_BITS=64 _LARGEFILE_SOURCE=1 _POSIX_C_SOURCE=200112L _POSIX_SOURCE=1 __CHAR_BIT__=8 __DBL_DENORM_MIN__=4.9406564584124654e-324 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d_dlopen='define' d_dlsymun='' d_dosuid='define' d_drand48_r='' d_drand48proto='define' d_dup2='define' d_eaccess='define' d_endgrent='define' d_endgrent_r='' d_endhent='define' d_endhostent_r='' d_endnent='define' d_endnetent_r='' d_endpent='define' d_endprotoent_r='' d_endpwent='define' d_endpwent_r='' d_endsent='define' d_endservent_r='' d_eofnblk='define' d_eunice='' d_faststdio='' d_fchdir='define' d_fchmod='define' d_fchown='define' d_fcntl='define' d_fcntl_can_lock='define' d_fd_macros='define' d_fd_set='define' d_fds_bits='' d_fgetpos='define' d_finite='define' d_finitel='define' d_flexfnam='define' d_flock='define' d_flockproto='define' d_fork='define' d_fp_class='' d_fpathconf='define' d_fpclass='' d_fpclassify='' d_fpclassl='' d_fpos64_t='' d_frexpl='define' d_fs_data_s='' d_fseeko='define' d_fsetpos='define' d_fstatfs='define' d_fstatvfs='define' d_fsync='define' d_ftello='define' d_ftime='' d_futimes='define' d_getcwd='define' d_getespwnam='' d_getfsstat='' d_getgrent='define' d_getgrent_r='' d_getgrgid_r='' d_getgrnam_r='' d_getgrps='define' d_gethbyaddr='define' d_gethbyname='define' d_gethent='define' d_gethname='define' d_gethostbyaddr_r='' d_gethostbyname_r='' d_gethostent_r='' d_gethostprotos='define' d_getitimer='define' d_getlogin='define' d_getlogin_r='' d_getmnt='' d_getmntent='define' d_getnbyaddr='define' d_getnbyname='define' d_getnent='define' d_getnetbyaddr_r='' d_getnetbyname_r='' d_getnetent_r='' d_getnetprotos='define' d_getpagsz='define' d_getpbyname='define' d_getpbynumber='define' d_getpent='define' d_getpgid='define' d_getpgrp='define' d_getpgrp2='' d_getppid='define' d_getprior='define' d_getprotobyname_r='' d_getprotobynumber_r='' d_getprotoent_r='' d_getprotoprotos='define' d_getprpwnam='' d_getpwent='define' d_getpwent_r='' d_getpwnam_r='' d_getpwuid_r='' d_getsbyname='define' d_getsbyport='define' d_getsent='define' d_getservbyname_r='' d_getservbyport_r='' d_getservent_r='' d_getservprotos='define' d_getspnam='define' d_getspnam_r='' d_gettimeod='define' d_gmtime_r='' d_gnulibc='define' d_grpasswd='define' d_hasmntopt='define' d_htonl='define' d_ilogbl='define' d_inc_version_list='' d_index='' d_inetaton='define' d_int64_t='define' d_isascii='define' d_isfinite='' d_isinf='define' d_isnan='define' d_isnanl='define' d_killpg='define' d_lchown='define' d_ldbl_dig='define' d_libm_lib_version='define' d_link='define' d_localtime_r='' d_localtime_r_needs_tzset='' d_locconv='define' d_lockf='define' d_longdbl='define' d_longlong='define' d_lseekproto='define' d_lstat='define' d_madvise='define' d_malloc_good_size='' d_malloc_size='' d_mblen='define' d_mbstowcs='define' d_mbtowc='define' d_memchr='define' d_memcmp='define' d_memcpy='define' d_memmove='define' d_memset='define' d_mkdir='define' d_mkdtemp='define' d_mkfifo='define' d_mkstemp='define' d_mkstemps='' d_mktime='define' d_mmap='define' d_modfl='define' d_modfl_pow32_bug='' d_modflproto='define' d_mprotect='define' d_msg='define' d_msg_ctrunc='define' d_msg_dontroute='define' d_msg_oob='define' d_msg_peek='define' d_msg_proxy='define' d_msgctl='define' d_msgget='define' d_msghdr_s='define' d_msgrcv='define' d_msgsnd='define' d_msync='define' d_munmap='define' d_mymalloc='' d_nice='define' d_nl_langinfo='define' d_nv_preserves_uv='define' d_nv_zero_is_allbits_zero='define' d_off64_t='' d_old_pthread_create_joinable='' d_oldpthreads='' d_oldsock='' d_open3='define' d_pathconf='define' d_pause='define' d_perl_otherlibdirs='' d_phostname='' d_pipe='define' d_poll='define' d_portable='define' d_printf_format_null='define' d_procselfexe='define' d_pseudofork='' d_pthread_atfork='' d_pthread_attr_setscope='define' d_pthread_yield='' d_pwage='' d_pwchange='' d_pwclass='' d_pwcomment='' d_pwexpire='' d_pwgecos='define' d_pwpasswd='define' d_pwquota='' d_qgcvt='define' d_quad='define' d_random_r='' d_readdir='define' d_readdir64_r='' d_readdir_r='' d_readlink='define' d_readv='define' d_recvmsg='define' d_rename='define' d_rewinddir='define' d_rmdir='define' d_safebcpy='' d_safemcpy='' d_sanemcmp='define' d_sbrkproto='define' d_scalbnl='define' d_sched_yield='define' d_scm_rights='define' d_seekdir='define' d_select='define' d_sem='define' d_semctl='define' d_semctl_semid_ds='define' d_semctl_semun='define' d_semget='define' d_semop='define' d_sendmsg='define' d_setegid='define' d_seteuid='define' d_setgrent='define' d_setgrent_r='' d_setgrps='define' d_sethent='define' d_sethostent_r='' d_setitimer='define' d_setlinebuf='define' d_setlocale='define' d_setlocale_r='' d_setnent='define' d_setnetent_r='' d_setpent='define' d_setpgid='define' d_setpgrp='define' d_setpgrp2='' d_setprior='define' d_setproctitle='' d_setprotoent_r='' d_setpwent='define' d_setpwent_r='' d_setregid='define' d_setresgid='define' d_setresuid='define' d_setreuid='define' d_setrgid='' d_setruid='' d_setsent='define' d_setservent_r='' d_setsid='define' d_setvbuf='define' d_sfio='' d_shm='define' d_shmat='define' d_shmatprototype='define' d_shmctl='define' d_shmdt='define' d_shmget='define' d_sigaction='define' d_signbit='define' d_sigprocmask='define' d_sigsetjmp='define' d_sitearch='define' d_snprintf='define' d_sockatmark='define' d_sockatmarkproto='define' d_socket='define' d_socklen_t='define' d_sockpair='define' d_socks5_init='' d_sprintf_returns_strlen='define' d_sqrtl='define' d_srand48_r='' d_srandom_r='' d_sresgproto='' d_sresuproto='' d_statblks='define' d_statfs_f_flags='' d_statfs_s='define' d_statvfs='define' d_stdio_cnt_lval='' d_stdio_ptr_lval='' d_stdio_ptr_lval_nochange_cnt='' d_stdio_ptr_lval_sets_cnt='' d_stdio_stream_array='' d_stdiobase='' d_stdstdio='' d_strchr='define' d_strcoll='define' d_strctcpy='define' d_strerrm='strerror(e)' d_strerror='define' d_strerror_r='' d_strftime='define' d_strlcat='' d_strlcpy='' d_strtod='define' d_strtol='define' d_strtold='define' d_strtoll='define' d_strtoq='define' d_strtoul='define' d_strtoull='define' d_strtouq='define' d_strxfrm='define' d_suidsafe='' d_symlink='define' d_syscall='define' d_syscallproto='define' d_sysconf='define' d_sysernlst='' d_syserrlst='define' d_system='define' d_tcgetpgrp='define' d_tcsetpgrp='define' d_telldir='define' d_telldirproto='define' d_time='define' d_times='define' d_tm_tm_gmtoff='define' d_tm_tm_zone='define' d_tmpnam_r='' d_truncate='define' d_ttyname_r='' d_tzname='define' d_u32align='' d_ualarm='define' d_umask='define' d_uname='define' d_union_semun='' d_unordered='' d_unsetenv='define' d_usleep='define' d_usleepproto='define' d_ustat='define' d_vendorarch='' d_vendorbin='' d_vendorlib='' d_vendorscript='' d_vfork='' d_void_closedir='' d_voidsig='define' d_voidtty='' d_volatile='define' d_vprintf='define' d_vsnprintf='define' d_wait4='define' d_waitpid='define' d_wcstombs='define' d_wctomb='define' d_writev='define' d_xenix='' date='date' db_hashtype='u_int32_t' db_prefixtype='size_t' db_version_major='4' db_version_minor='4' db_version_patch='20' defvoidused='15' direntrytype='struct dirent' dlext='so' dlsrc='dl_dlopen.xs' doublesize='8' drand01='drand48()' drand48_r_proto='0' dynamic_ext='B Compress/Raw/Zlib Cwd DB_File Data/Dumper Devel/DProf Devel/PPPort Devel/Peek Digest/MD5 Digest/SHA Encode Fcntl File/Glob Filter/Util/Call GDBM_File Hash/Util I18N/Langinfo IO IPC/SysV List/Util MIME/Base64 Math/BigInt/FastCalc Opcode POSIX PerlIO/encoding PerlIO/scalar PerlIO/via SDBM_File Socket Storable Sys/Hostname Sys/Syslog Text/Soundex Time/HiRes Time/Piece Unicode/Normalize XS/APItest XS/Typemap attrs re threads threads/shared Hash/Util/FieldHash' eagain='EAGAIN' ebcdic='' echo='echo' egrep='egrep' emacs='' endgrent_r_proto='0' endhostent_r_proto='0' endnetent_r_proto='0' endprotoent_r_proto='0' endpwent_r_proto='0' endservent_r_proto='0' eunicefix=':' exe_ext='' expr='expr' extensions='B Compress/Raw/Zlib Cwd DB_File Data/Dumper Devel/DProf Devel/PPPort Devel/Peek Digest/MD5 Digest/SHA Encode Fcntl File/Glob Filter/Util/Call GDBM_File Hash/Util I18N/Langinfo IO IPC/SysV List/Util MIME/Base64 Math/BigInt/FastCalc Opcode POSIX PerlIO/encoding PerlIO/scalar PerlIO/via SDBM_File Socket Storable Sys/Hostname Sys/Syslog Text/Soundex Time/HiRes Time/Piece Unicode/Normalize XS/APItest XS/Typemap attrs re threads threads/shared Hash/Util/FieldHash Compress/Zlib Errno IO_Compress_Base IO_Compress_Zlib' extras='' fflushNULL='define' fflushall='' find='' firstmakefile='makefile' flex='' fpossize='16' fpostype='fpos_t' freetype='void' from=':' full_ar='/usr/bin/ar' full_csh='/bin/csh' full_sed='/bin/sed' gccansipedantic='' gccosandvers='' gccversion='4.2.3 (Debian 4.2.3-1)' getgrent_r_proto='0' getgrgid_r_proto='0' getgrnam_r_proto='0' gethostbyaddr_r_proto='0' gethostbyname_r_proto='0' gethostent_r_proto='0' getlogin_r_proto='0' getnetbyaddr_r_proto='0' getnetbyname_r_proto='0' getnetent_r_proto='0' getprotobyname_r_proto='0' getprotobynumber_r_proto='0' getprotoent_r_proto='0' getpwent_r_proto='0' getpwnam_r_proto='0' getpwuid_r_proto='0' getservbyname_r_proto='0' getservbyport_r_proto='0' getservent_r_proto='0' getspnam_r_proto='0' gidformat='"lu"' gidsign='1' gidsize='4' gidtype='gid_t' glibpth='/usr/shlib /lib /usr/lib /usr/lib/386 /lib/386 /usr/ccs/lib /usr/ucblib /usr/local/lib /lib64 /usr/lib64 /usr/local/lib64 ' gmake='gmake' gmtime_r_proto='0' gnulibc_version='2.7' grep='grep' groupcat='cat /etc/group' groupstype='gid_t' gzip='gzip' h_fcntl='false' h_sysfile='true' hint='recommended' hostcat='cat /etc/hosts' html1dir=' ' html1direxp='' html3dir=' ' html3direxp='' i16size='2' i16type='short' i32size='4' i32type='long' i64size='8' i64type='long long' i8size='1' i8type='char' i_arpainet='define' i_bsdioctl='' i_crypt='define' i_db='define' i_dbm='' i_dirent='define' i_dld='' i_dlfcn='define' i_fcntl='' i_float='define' i_fp='' i_fp_class='' i_gdbm='define' i_grp='define' i_ieeefp='' i_inttypes='define' i_langinfo='define' i_libutil='' i_limits='define' i_locale='define' 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i_varhdr='stdarg.h' i_vfork='' ignore_versioned_solibs='y' inc_version_list=' ' inc_version_list_init='0' incpath='' inews='' initialinstalllocation='/tmp/p/bin' installarchlib='/tmp/p/lib/perl5/5.10.0/i686-linux' installbin='/tmp/p/bin' installhtml1dir='' installhtml3dir='' installman1dir='/tmp/p/man/man1' installman3dir='/tmp/p/man/man3' installprefix='/tmp/p' installprefixexp='/tmp/p' installprivlib='/tmp/p/lib/perl5/5.10.0' installscript='y' installsitearch='/tmp/p/lib/perl5/site_perl/5.10.0/i686-linux' installsitebin='/tmp/p/bin' installsitehtml1dir='' installsitehtml3dir='' installsitelib='/tmp/p/lib/perl5/site_perl/5.10.0' installsiteman1dir='/tmp/p/man/man1' installsiteman3dir='/tmp/p/man/man3' installsitescript='/tmp/p/bin' installstyle='lib/perl5' installusrbinperl='' installvendorarch='' installvendorbin='' installvendorhtml1dir='' installvendorhtml3dir='' installvendorlib='' installvendorman1dir='' installvendorman3dir='' installvendorscript='' intsize='4' issymlink='test -h' ivdformat='"ld"' ivsize='4' ivtype='long' known_extensions='B Compress/Raw/Zlib Cwd DB_File Data/Dumper Devel/DProf Devel/PPPort Devel/Peek Digest/MD5 Digest/SHA Encode Fcntl File/Glob Filter/Util/Call GDBM_File Hash/Util I18N/Langinfo IO IPC/SysV List/Util MIME/Base64 Math/BigInt/FastCalc NDBM_File ODBM_File Opcode POSIX PerlIO/encoding PerlIO/scalar PerlIO/via SDBM_File Socket Storable Sys/Hostname Sys/Syslog Text/Soundex Time/HiRes Time/Piece Unicode/Normalize Win32 Win32API/File Win32CORE XS/APItest XS/Typemap attrs re threads threads/shared Hash/Util/FieldHash' ksh='' ld='cc' lddlflags='-shared -O2 -L/usr/local/lib' ldflags=' -L/usr/local/lib' ldflags_nolargefiles=' -L/usr/local/lib' ldflags_uselargefiles='' ldlibpthname='LD_LIBRARY_PATH' less='less' lib_ext='.a' libc='/lib/libc-2.7.so' libdb_needs_pthread='N' libperl='libperl.a' libpth='/usr/local/lib /lib /usr/lib /lib64 /usr/lib64' libs='-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc' libs_nolargefiles='-lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc' libsdirs=' /usr/lib' libsfiles=' libnsl.so libgdbm.so libdb.so libdl.so libm.so libcrypt.so libutil.so libc.so' libsfound=' /usr/lib/libnsl.so /usr/lib/libgdbm.so /usr/lib/libdb.so /usr/lib/libdl.so /usr/lib/libm.so /usr/lib/libcrypt.so /usr/lib/libutil.so /usr/lib/libc.so' libspath=' /usr/local/lib /lib /usr/lib /lib64 /usr/lib64' libswanted='sfio socket inet nsl nm ndbm gdbm dbm db malloc dl dld ld sun m crypt sec util c cposix posix ucb BSD' libswanted_nolargefiles='sfio socket inet nsl nm ndbm gdbm dbm db malloc dl dld ld sun m crypt sec util c cposix posix ucb BSD' libswanted_uselargefiles='' line='' lint='' lkflags='' ln='ln' lns='/bin/ln -s' localtime_r_proto='0' locincpth='/usr/local/include /opt/local/include /usr/gnu/include /opt/gnu/include /usr/GNU/include /opt/GNU/include' loclibpth='/usr/local/lib /opt/local/lib /usr/gnu/lib /opt/gnu/lib /usr/GNU/lib /opt/GNU/lib' longdblsize='12' longlongsize='8' longsize='4' lp='' lpr='' ls='ls' lseeksize='8' lseektype='off_t' mad='' madlyh='' madlyobj='' madlysrc='' mail='' mailx='' make='make' make_set_make='#' mallocobj='' mallocsrc='' malloctype='void *' man1dir='/tmp/p/man/man1' man1direxp='/tmp/p/man/man1' man1ext='1' man3dir='/tmp/p/man/man3' man3direxp='/tmp/p/man/man3' man3ext='3' mips_type='' mistrustnm='' mkdir='mkdir' mmaptype='void *' modetype='mode_t' more='more' multiarch='' mv='' myarchname='i686-linux' mydomain='.bfw.de' myhostname='debian' myuname='linux debian.bfw.de 2.6.23-1-686-bigmem #1 smp sun dec 23 21:43:22 cet 2007 i686 gnulinux ' n='-n' need_va_copy='' netdb_hlen_type='size_t' netdb_host_type='const void *' netdb_name_type='const char *' netdb_net_type='in_addr_t' nm='nm' nm_opt='' nm_so_opt='--dynamic' nonxs_ext='Compress/Zlib Errno IO_Compress_Base IO_Compress_Zlib' nroff='nroff' nvEUformat='"E"' nvFUformat='"F"' nvGUformat='"G"' nv_preserves_uv_bits='32' nveformat='"e"' nvfformat='"f"' nvgformat='"g"' nvsize='8' nvtype='double' o_nonblock='O_NONBLOCK' obj_ext='.o' old_pthread_create_joinable='' optimize='-O2' orderlib='false' osname='linux' osvers='2.6.23-1-686-bigmem' otherlibdirs=' ' package='perl5' pager='/usr/bin/less' passcat='cat /etc/passwd' patchlevel='10' path_sep=':' perl='' perl5='/usr/bin/perl' perl_patchlevel='' perladmin='springl@debian.bfw.de' perllibs='-lnsl -ldl -lm -lcrypt -lutil -lc' perlpath='/tmp/p/bin/perl' pg='pg' phostname='hostname' pidtype='pid_t' plibpth='' pmake='' pr='' prefix='/tmp/p' prefixexp='/tmp/p' privlib='/tmp/p/lib/perl5/5.10.0' privlibexp='/tmp/p/lib/perl5/5.10.0' procselfexe='"/proc/self/exe"' prototype='define' ptrsize='4' quadkind='3' quadtype='long long' randbits='48' randfunc='drand48' random_r_proto='0' randseedtype='long' ranlib=':' rd_nodata='-1' readdir64_r_proto='0' readdir_r_proto='0' revision='5' rm='rm' rm_try='/bin/rm -f try try a.out .out try.[cho] try..o core core.try* try.core*' rmail='' run='' runnm='false' sPRIEUldbl='"LE"' sPRIFUldbl='"LF"' sPRIGUldbl='"LG"' sPRIXU64='"LX"' sPRId64='"Ld"' sPRIeldbl='"Le"' sPRIfldbl='"Lf"' sPRIgldbl='"Lg"' sPRIi64='"Li"' sPRIo64='"Lo"' sPRIu64='"Lu"' sPRIx64='"Lx"' sSCNfldbl='"Lf"' sched_yield='sched_yield()' scriptdir='y' scriptdirexp='y' sed='sed' seedfunc='srand48' selectminbits='32' selecttype='fd_set *' sendmail='' setgrent_r_proto='0' sethostent_r_proto='0' setlocale_r_proto='0' setnetent_r_proto='0' setprotoent_r_proto='0' setpwent_r_proto='0' setservent_r_proto='0' sh='/bin/sh' shar='' sharpbang='#!' shmattype='void *' shortsize='2' shrpenv='' shsharp='true' sig_count='65' sig_name='ZERO HUP INT QUIT ILL TRAP ABRT BUS FPE KILL USR1 SEGV USR2 PIPE ALRM TERM STKFLT CHLD CONT STOP TSTP TTIN TTOU URG XCPU XFSZ VTALRM PROF WINCH IO PWR SYS NUM32 NUM33 RTMIN NUM35 NUM36 NUM37 NUM38 NUM39 NUM40 NUM41 NUM42 NUM43 NUM44 NUM45 NUM46 NUM47 NUM48 NUM49 NUM50 NUM51 NUM52 NUM53 NUM54 NUM55 NUM56 NUM57 NUM58 NUM59 NUM60 NUM61 NUM62 NUM63 RTMAX IOT CLD POLL UNUSED ' sig_name_init='"ZERO", "HUP", "INT", "QUIT", "ILL", "TRAP", "ABRT", "BUS", "FPE", "KILL", "USR1", "SEGV", "USR2", "PIPE", "ALRM", "TERM", "STKFLT", "CHLD", "CONT", "STOP", "TSTP", "TTIN", "TTOU", "URG", "XCPU", "XFSZ", "VTALRM", "PROF", "WINCH", "IO", "PWR", "SYS", "NUM32", "NUM33", "RTMIN", "NUM35", "NUM36", "NUM37", "NUM38", "NUM39", "NUM40", "NUM41", "NUM42", "NUM43", "NUM44", "NUM45", "NUM46", "NUM47", "NUM48", "NUM49", "NUM50", "NUM51", "NUM52", "NUM53", "NUM54", "NUM55", "NUM56", "NUM57", "NUM58", "NUM59", "NUM60", "NUM61", "NUM62", "NUM63", "RTMAX", "IOT", "CLD", "POLL", "UNUSED", 0' sig_num='0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 6 17 29 31 ' sig_num_init='0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 6, 17, 29, 31, 0' sig_size='69' signal_t='void' sitearch='/tmp/p/lib/perl5/site_perl/5.10.0/i686-linux' sitearchexp='/tmp/p/lib/perl5/site_perl/5.10.0/i686-linux' sitebin='/tmp/p/bin' sitebinexp='/tmp/p/bin' sitehtml1dir='' sitehtml1direxp='' sitehtml3dir='' sitehtml3direxp='' sitelib='/tmp/p/lib/perl5/site_perl/5.10.0' sitelib_stem='/tmp/p/lib/perl5/site_perl' sitelibexp='/tmp/p/lib/perl5/site_perl/5.10.0' siteman1dir='/tmp/p/man/man1' siteman1direxp='/tmp/p/man/man1' siteman3dir='/tmp/p/man/man3' siteman3direxp='/tmp/p/man/man3' siteprefix='/tmp/p' siteprefixexp='/tmp/p' sitescript='/tmp/p/bin' sitescriptexp='/tmp/p/bin' sizesize='4' sizetype='size_t' sleep='' smail='' so='so' sockethdr='' socketlib='' socksizetype='socklen_t' sort='sort' spackage='Perl5' spitshell='cat' srand48_r_proto='0' srandom_r_proto='0' src='.' ssizetype='ssize_t' startperl='#!/tmp/p/bin/perl' startsh='#!/bin/sh' static_ext=' ' stdchar='char' stdio_base='((fp)->_IO_read_base)' stdio_bufsiz='((fp)->_IO_read_end - (fp)->_IO_read_base)' stdio_cnt='((fp)->_IO_read_end - (fp)->_IO_read_ptr)' stdio_filbuf='' stdio_ptr='((fp)->_IO_read_ptr)' stdio_stream_array='' strerror_r_proto='0' strings='/usr/include/string.h' submit='' subversion='0' sysman='/usr/share/man/man1' tail='' tar='' targetarch='' tbl='' tee='' test='test' timeincl='/usr/include/sys/time.h /usr/include/time.h ' timetype='time_t' tmpnam_r_proto='0' to=':' touch='touch' tr='tr' trnl='\n' troff='' ttyname_r_proto='0' u16size='2' u16type='unsigned short' u32size='4' u32type='unsigned long' u64size='8' u64type='unsigned long long' u8size='1' u8type='unsigned char' uidformat='"lu"' uidsign='1' uidsize='4' uidtype='uid_t' uname='uname' uniq='uniq' uquadtype='unsigned long long' use5005threads='' use64bitall='' use64bitint='' usecrosscompile='' usedl='define' usefaststdio='' useithreads='' uselargefiles='define' uselongdouble='' usemallocwrap='define' usemorebits='' usemultiplicity='' usemymalloc='n' usenm='false' useopcode='true' useperlio='define' useposix='true' usereentrant='' userelocatableinc='' usesfio='false' useshrplib='false' usesitecustomize='' usesocks='' usethreads='' usevendorprefix='' usevfork='false' usrinc='/usr/include' uuname='' uvXUformat='"lX"' uvoformat='"lo"' uvsize='4' uvtype='unsigned long' uvuformat='"lu"' uvxformat='"lx"' vendorarch='' vendorarchexp='' vendorbin='' vendorbinexp='' vendorhtml1dir=' ' vendorhtml1direxp='' vendorhtml3dir=' ' vendorhtml3direxp='' vendorlib='' vendorlib_stem='' vendorlibexp='' vendorman1dir=' ' vendorman1direxp='' vendorman3dir=' ' vendorman3direxp='' vendorprefix='' vendorprefixexp='' vendorscript='' vendorscriptexp='' version='5.10.0' version_patchlevel_string='version 10 subversion 0' versiononly='' vi='' voidflags='15' xlibpth='/usr/lib/386 /lib/386' yacc='yacc' yaccflags='' zcat='' zip='zip' -- Stephan Springl BFW Werner Völk GmbH Mail: springl-perlbug@bfw-online.de Energiemesstechnik & Service ```
p5pRT commented 16 years ago

From @iabyn

On Mon\, Feb 04\, 2008 at 07​:22​:29AM -0800\, Stephan Springl wrote​:

Thank you for your work on perl. Unfortunately\, perl 5.10.0 segfaults on the following program​:

============================================== sub f ($); # Comment out to get right result! sub f ($) { my $test = $_[0]; write; format STDOUT = @​\<\<\<\<\<\<\< $test . } f(1); f(2);

Thanks for the concise test case.

P5Pers​:

The bug is due to the fact that in the presence of prototypes\, after the real sub is compiled\, its body is physically copied across to a new CV\, which messes the CvOUTSIDE field of any child anon or format subs. The anon subs are fixed up by looking through the parent's pad for any '&' entries which point to the children that need fixing. There isn't a similar way to find formats\, so they can't be fixed up.

The two solutions seem to be​:

a) have pointers in parent pads to formats\, or b) rejig newATTRSUB in such a way that it doesn't have to do the abomination of copying the CV body.

Don't really have time to look at this further yet.

-- "Strange women lying in ponds distributing swords is no basis for a system of government. Supreme executive power derives from a mandate from the masses\, not from some farcical aquatic ceremony."   -- Dennis\, "Monty Python and the Holy Grail"

p5pRT commented 16 years ago

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

p5pRT commented 15 years ago

From @nwc10

Dave notes​:

a closure/format segfault in 5.10

p5pRT commented 15 years ago

From chromatic@wgz.org

On Tuesday 05 February 2008 16​:29​:12 Dave Mitchell wrote​:

The bug is due to the fact that in the presence of prototypes\, after the real sub is compiled\, its body is physically copied across to a new CV\, which messes the CvOUTSIDE field of any child anon or format subs. The anon subs are fixed up by looking through the parent's pad for any '&' entries which point to the children that need fixing. There isn't a similar way to find formats\, so they can't be fixed up.

The two solutions seem to be​:

a) have pointers in parent pads to formats\, or b) rejig newATTRSUB in such a way that it doesn't have to do the abomination of copying the CV body.

Don't really have time to look at this further yet.

I don't think b) is tractable. If anything's taken a reference to a sub prototype\, it points to the first CV. If you stuff a new CV (a properly mangled PL_compcv\, for example) in the GV (or wherever)\, you break at least an AutoLoader test in the core\, and some expectations elsewhere. My failed attempt produced failures in​:

  ../ext/Math-BigInt-FastCalc/t/bigintfc.t   ../lib/AutoLoader/t/01AutoLoader.t   ../lib/Exporter.t   ../lib/Math/BigInt/t/sub_mbf.t   ../lib/bignum/t/bninfnan.t   ../lib/bignum/t/brinfnan.t   op/closure.t   op/method.t

... along these lines​:

not ok 41 # Failed at t/op/method.t line 136 # got 'B​: In B​::e\, 2' # expected 'C​: In C​::e\, 1' not ok 42 # Failed at t/op/method.t line 138 # got 'B​: In A​::ee\, 3' # expected 'B​: In A​::ee\, 2' not ok 43 # Failed at t/op/method.t line 139 # got 'B​: In A​::ee\, 3' # expected 'B​: In A​::ee\, 2'

-- c

p5pRT commented 15 years ago

From p5p@spam.wizbit.be

----Program---- #!/usr/bin/perl -l

sub f ($); # Comment out to get right result! sub f ($) {   my $test = $_[0];   write;   format STDOUT = @​\<\<\<\<\<\<\< $test . } f(1); f(2);

----Output of .../pd2oePD/perl-5.8.0@​19648/bin/perl---- 1 1

----EOF ($?='0')---- ----Output of .../pKd6Hks/perl-5.8.0@​19649/bin/perl----

----EOF ($?='11')----

http​://perl5.git.perl.org/perl.git/commit/ 71f882da828ecd892a162839f27e4625d69023fb uthor Dave Mitchell \davem@&#8203;fdisolutions\.com   Sat\, 31 May 2003 19​:54​:48 +0000 (20​:54 +0100) committer Rafael Garcia-Suarez \rgarciasuarez@&#8203;gmail\.com   Sat\, 31 May 2003 18​:33​:07 +0000 (18​:33 +0000) commit 71f882da828ecd892a162839f27e4625d69023fb tree aec07a1ff1cac538c9b9c2426fbb4b427a03e341 tree | snapshot parent 0aeb64d0d71d7345dba69c9999c49f4fbb55b24b commit | diff

jumbo closure patch broke formats Message-ID​: \20030531185448\.GA6055@&#8203;fdgroup\.com Plus restore the original test script for bug #22372

p4raw-id​: //depot/perl@​19649

p5pRT commented 15 years ago

From andy@hexten.net

On Thu Jun 25 14​:50​:51 2009\, chromatic@​wgz.org wrote​:

On Tuesday 05 February 2008 16​:29​:12 Dave Mitchell wrote​:

The bug is due to the fact that in the presence of prototypes\, after the real sub is compiled\, its body is physically copied across to a new CV\, which messes the CvOUTSIDE field of any child anon or format subs. The anon subs are fixed up by looking through the parent's pad for any '&' entries which point to the children that need fixing. There isn't a similar way to find formats\, so they can't be fixed up.

The two solutions seem to be​:

a) have pointers in parent pads to formats\, or b) rejig newATTRSUB in such a way that it doesn't have to do the abomination of copying the CV body.

Don't really have time to look at this further yet.

I don't think b) is tractable. If anything's taken a reference to a sub prototype\, it points to the first CV. If you stuff a new CV (a properly mangled PL_compcv\, for example) in the GV (or wherever)\, you break at least an AutoLoader test in the core\, and some expectations elsewhere. My failed attempt produced failures in​:

    \.\./ext/Math\-BigInt\-FastCalc/t/bigintfc\.t
    \.\./lib/AutoLoader/t/01AutoLoader\.t
    \.\./lib/Exporter\.t
    \.\./lib/Math/BigInt/t/sub\_mbf\.t
    \.\./lib/bignum/t/bninfnan\.t
    \.\./lib/bignum/t/brinfnan\.t
    op/closure\.t
    op/method\.t

... along these lines​:

not ok 41 # Failed at t/op/method.t line 136 # got 'B​: In B​::e\, 2' # expected 'C​: In C​::e\, 1' not ok 42 # Failed at t/op/method.t line 138 # got 'B​: In A​::ee\, 3' # expected 'B​: In A​::ee\, 2' not ok 43 # Failed at t/op/method.t line 139 # got 'B​: In A​::ee\, 3' # expected 'B​: In A​::ee\, 2'

What happens if we don't throw away the newly compiled sub after copying it into the prototype? That seems to solve the dangling reference problem but I have no idea what else it might break. The naive test I just did does indeed make the test case behave - but causes other breakage. But that may just be because I'm not quite sure which refcounts I need to bump.

p5pRT commented 14 years ago

From zefram@fysh.org

I wrote​:

Attached patch fixes bug #22977. make regen_perly after applying.

Should also fix bug #50528\, apparently a duplicate.

-zefram

p5pRT commented 14 years ago

@rgs - Status changed from 'open' to 'resolved'

p5pRT commented 12 years ago

From @cpansprout

On Tue Feb 05 16​:33​:41 2008\, davem wrote​:

On Mon\, Feb 04\, 2008 at 07​:22​:29AM -0800\, Stephan Springl wrote​:

Thank you for your work on perl. Unfortunately\, perl 5.10.0 segfaults on the following program​:

============================================== sub f ($); # Comment out to get right result! sub f ($) { my $test = $_[0]; write; format STDOUT = @​\<\<\<\<\<\<\< $test . } f(1); f(2);

Thanks for the concise test case.

That was actually your own test case\, from #22977. :-)

P5Pers​:

The bug is due to the fact that in the presence of prototypes\, after the real sub is compiled\, its body is physically copied across to a new CV\, which messes the CvOUTSIDE field of any child anon or format subs. The anon subs are fixed up by looking through the parent's pad for any '&' entries which point to the children that need fixing. There isn't a similar way to find formats\, so they can't be fixed up.

The two solutions seem to be​:

a) have pointers in parent pads to formats\, or

Zefram did that in commit 421f30ed1e\, but it can cause a crash. A format’s CvOUTSIDE must never be touched\, because a format can be cloned at any time\, so its CvOUTSIDE must always be available for it to close over. If CvOUTSIDE is weakened\, the outer sub could be freed\, causing the format to point to its grandfather. Then cloning will read random pad items from the wrong pad.

b) rejig newATTRSUB in such a way that it doesn't have to do the abomination of copying the CV body.

Like copying it in perly.y​:subname instead?

An alternative fix would be to have the outer pad hold a weak reference on the format.

--

Father Chrysostomos

p5pRT commented 12 years ago

From @cpansprout

On Thu Jun 28 13​:17​:40 2012\, sprout wrote​:

On Tue Feb 05 16​:33​:41 2008\, davem wrote​:

The two solutions seem to be​:

a) have pointers in parent pads to formats\, or

Zefram did that in commit 421f30ed1e\, but it can cause a crash. A format’s CvOUTSIDE must never be touched\, because a format can be cloned at any time\, so its CvOUTSIDE must always be available for it to close over. If CvOUTSIDE is weakened\, the outer sub could be freed\, causing the format to point to its grandfather. Then cloning will read random pad items from the wrong pad.

I changed the direction of the weak reference\, in commit e09ac07\, since that seemed the easiest fix.

b) rejig newATTRSUB in such a way that it doesn't have to do the abomination of copying the CV body.

Like copying it in perly.y​:subname instead?

That is problematic\, in that newATTRSUB is an API function\, so we would have to do it in both places\, solving nothing.

If we could change that\, with the new op slab allocator (not merged yet)\, after errors we would end up with stubs floating around with slabs attached to them--not something I find comforting.

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Father Chrysostomos