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PSGI toolkit and server adapters
http://plackperl.org/
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Warning with Plack::App::WrapCGI and perl 5.20.0 #468

Closed eserte closed 9 years ago

eserte commented 10 years ago

There are new warnings when using Plack::App::WrapCGI with perl 5.20.0:

Use of uninitialized value in syswrite at /home/travis/perl5/perlbrew/perls/5.20/lib/site_perl/5.20.0/Plack/App/WrapCGI.pm line 56, <$io> line 1.

The same system does not emit these warnings on perl 5.18.2 or older.

Please let me hear if you need more details.

miyagawa commented 9 years ago

I can't seem to be able to reproduce.

rshingleton commented 9 years ago

e15:46:26 Use of uninitialized value in syswrite at /home/perl5/perls/mod_perl-5.20.0/lib/site_perl/5.20.0/Plack/App/WrapCGI.pm line 56, <$io> line 1.

I'm experiencing the same issue.

miyagawa commented 9 years ago

I cannot reproduce the same error and "I'm having the same issue" is not a helpful report at all.

rshingleton commented 9 years ago

You're right, I apologize for my lack of information. I was trying to point out that this was not a lone occurrence.

I get the error on any request to a wrapped cgi call.

System Info: CentOS release 5.8 (Final)

PerlBrew install: perl-5.20.0 Installed with the following options: -n --switch -D-A -Dccflags=-fPIC -f -Duseshrplib

Known Perl Non-Standard Modules: Dancer Net::LDAP Archive::Zip Authen::SASL JSON SOAP::Lite Spreadsheet::ParseExcel Spreadsheet::XLSX XML::Simple Plack::Runner YAML Dancer::Session::Storable Template Dancer::Template::TemplateToolkit MooX MooX::Singleton DateTime DateTime::Format::MySQL Class::HPLOO::Base DBD DBD::mysql FindBin Plack::Handler::Apache2 FCGI Starman Daemon::Control Plack::App::CGIBin Plack::Builder CGI::Emulate::PSGI CGI::Compile DBIx::Connector DBIx::Simple DBIx::Custom Net::SSH::Perl Net::SCP Net::OpenSSH Plack::Middleware::XForwardedFor

Installed system packages (yum list installed): Loaded plugins: fastestmirror, security Packages GConf2.i386 2.14.0-9.el5
GConf2.x86_64 2.14.0-9.el5
MAKEDEV.x86_64 3.23-1.2
NetworkManager.i386 1:0.7.0-13.el5
NetworkManager.x86_64 1:0.7.0-13.el5
NetworkManager-glib.i386 1:0.7.0-13.el5
NetworkManager-glib.x86_64 1:0.7.0-13.el5
ORBit2.i386 2.14.3-5.el5
ORBit2.x86_64 2.14.3-5.el5
OpenIPMI.x86_64 2.0.16-12.el5
OpenIPMI-libs.x86_64 2.0.16-12.el5
SysVinit.x86_64 2.86-17.el5
TIVsm-API64.x86_64 6.3.0-0
TIVsm-BA.x86_64 6.3.0-0
Xaw3d.x86_64 1.5E-10.1
acl.x86_64 2.2.39-8.el5
acpid.x86_64 1.0.4-12.el5
alsa-lib.i386 1.0.17-1.el5
alsa-lib.x86_64 1.0.17-1.el5
amtu.x86_64 1.0.6-2.el5
anacron.x86_64 2.3-45.el5.centos
aspell.i386 12:0.60.3-12
aspell.x86_64 12:0.60.3-12
aspell-en.x86_64 50:6.0-2.1
at.x86_64 3.1.8-84.el5
atk.i386 1.12.2-1.fc6
atk.x86_64 1.12.2-1.fc6
attr.x86_64 2.4.32-1.1
audiofile.i386 1:0.2.6-5
audiofile.x86_64 1:0.2.6-5
audit.x86_64 1.8-2.el5
audit-libs.i386 1.8-2.el5
audit-libs.x86_64 1.8-2.el5
audit-libs-python.x86_64 1.8-2.el5
authconfig.x86_64 5.3.21-7.el5
autofs.x86_64 1:5.0.1-0.rc2.163.el5
avahi.i386 0.6.16-10.el5_6
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basesystem.noarch 8.0-5.1.1.el5.centos
bash.x86_64 3.2-33.el5_10.4
bc.x86_64 1.06-21
bind-libs.x86_64 30:9.3.6-20.P1.el5
bind-utils.x86_64 30:9.3.6-20.P1.el5
binutils.x86_64 2.17.50.0.6-20.el5
bitstream-vera-fonts.noarch 1.10-7
bluez-gnome.x86_64 0.5-5.fc6
bluez-libs.x86_64 3.7-1.1
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hal.i386 0.5.8.1-62.el5
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initscripts.x86_64 8.45.42-1.el5.centos
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ipsec-tools.x86_64 0.6.5-14.el5_5.5
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iputils.x86_64 20020927-46.el5
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kernel.x86_64 2.6.18-308.el5
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udev.x86_64 095-14.27.el5_7.1
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miyagawa commented 9 years ago

Show me the code, and how you run the app (which server options, command line args).

frioux commented 9 years ago

I think you all have an old version of plack. This was fixed in august: https://metacpan.org/changes/distribution/Plack#L28

frioux commented 9 years ago

Ok, if you guys are still having the issue after ensuring you are at the latest version of Plack, I suspect that the fix will be to change line 56ff to be:

        my $v = do {
            local $/;
            my $fh = $env->{'psgi.input'};
            <$fh>;
        };
        syswrite($stdinw, $v) if defined $v;
rshingleton commented 9 years ago

I was a minor revision behind on Plack, but still experienced the issue after updating: Successfully installed Plack-1.0033 (upgraded from 1.0031)

On your suggestion, I modified Plack/App/WrapCGI.pm to the following and it seems to have resolved the issue:

        my $v = do{
            local $/;
            my $fh = $env->{'psgi.input'};
            <$fh>;
        };
        syswrite($stdinw, $v) if defined $v;

        #syswrite($stdinw, do {
        #    local $/;
        #    my $fh = $env->{'psgi.input'};
        #    <$fh>;
        #});
        # close STDIN so child will stop waiting
        close $stdinw;
miyagawa commented 9 years ago

@frioux could you open a pull request so that your contribution can be correctly credited?

@rshingleton let me ask you one last time: what is your server environment (web server, PSGI server) and what kind of requests cause that warning?

eserte commented 9 years ago

I am not rshingleton, and I was never asked for details (see the very first post in this issue), but nevertheless I'll point you to my problematic project:

Sorry, it's a large project, so maybe not suitable for debugging...

miyagawa commented 9 years ago

@eserte it will be appreciated if you can replicate the problem with a few lines of code.

frioux commented 9 years ago

https://github.com/plack/Plack/pull/484

miyagawa commented 9 years ago

@eserte when I wrote "I cannot reproduce" I implied "re-open the issue with more details if you can reliably reproduce". It's my bad that I wasn't explicit about it, but when you report a bug, consider that there's no too much information.

eserte commented 9 years ago

I found out that it has to be starman. I cannot reproduce the issue with the standard plackup server. The following is enough to reproduce the problem (remember, perl 5.20.x is needed):

use Plack::Builder;
use Plack::App::WrapCGI;

builder {
    mount '/' => Plack::App::WrapCGI->new(
        script  => 'test.cgi',
        execute => 1,
    )->to_app;
};
#!/usr/bin/perl

use strict;
use CGI ':standard';

print header;
print "hello\n";

__END__

With starman I see the following warnings:

$ perl5.20.1 -S starman
2014/12/17-23:31:52 Starman::Server (type Net::Server::PreFork) starting! pid(49709)
Resolved [*]:5000 to [0.0.0.0]:5000, IPv4
Binding to TCP port 5000 on host 0.0.0.0 with IPv4
Setting gid to "1000 1000 1000 0 5 1023 1024"
Use of uninitialized value in syswrite at /usr/perl5.20.1/lib/site_perl/5.20.1/Plack/App/WrapCGI.pm line 56, <$io> line 1.
Use of uninitialized value in syswrite at /usr/perl5.20.1/lib/site_perl/5.20.1/Plack/App/WrapCGI.pm line 56, <$io> line 1.
miyagawa commented 9 years ago

@eserte thanks, I just was able to reproduce it as well.

rshingleton commented 9 years ago

First, thanks for all the input and sorry for the lack of detail on my part. I've been in and out of meetings and code work all day while following this, so my attention has been somewhat split.

I am running this in Starman (Starman 0.4011) as well. Any request seems to cause the error, post, get, etc.

I tested with @eserte's example and get the same result (error message).