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Id: 77819
Status: rejected
Priority: 0/
Queue: threads-shared

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Owner: Nobody in particular
Requestors: matti.linnanvuori [...] portalify.com
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Subject: Hanging in leaving context
Date: Thu, 14 Jun 2012 13:52:56 +0300
To: bug-threads-shared [...] rt.cpan.org
From: Matti Linnanvuori <matti.linnanvuori [...] portalify.com>
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Hi! I think I have found a bug where a thread hangs when leaving a context and unlocking a locked variable. The code hangs after printing "Unlocking sendable". [Switching to thread 2 (Thread 0x7f71ab036710 (LWP 13223))]#0 0x00007f71acea90a4 in __lll_lock_wait () from /lib64/libpthread.so.0 (gdb) bt #0 0x00007f71acea90a4 in __lll_lock_wait () from /lib64/libpthread.so.0 #1 0x00007f71acea4429 in _L_lock_1004 () from /lib64/libpthread.so.0 #2 0x00007f71acea423e in pthread_mutex_lock () from /lib64/libpthread.so.0 #3 0x00007f71ac511cac in recursive_lock_release (my_perl=0x7b7100, lock=0x80) at shared.xs:200 #4 0x00000000004b7495 in Perl_leave_scope () #5 0x000000000047f9aa in Perl_pp_leavesub () #6 0x0000000000455ad3 in Perl_runops_debug () #7 0x0000000000479430 in Perl_call_sv () #8 0x00007f71ac938cf9 in S_ithread_run (arg=<value optimized out>) at threads.xs:517 #9 0x00007f71acea25f0 in start_thread () from /lib64/libpthread.so.0 #10 0x00007f71acc1184d in clone () from /lib64/libc.so.6 #11 0x0000000000000000 in ?? () sub send_line { my ( $self, $service, $type, $message, @line ) = @_; logf "Locking sendable"; lock $sendable; logf "Locked sendable"; if ( my $line = set_ctsds( $service, $type ) ) { unshift @line, $line; } $sendable = shared_clone($message); my $error; my $message_reference; for my $line (@line) { if ( $message->{'type'} eq 'dispatch' and substr( $line, 0, 2 ) ne 'AT' ) { $message_reference = hex( substr $line, 4, 2 ); $message[$message_reference] = $sendable; } logf "Locking response"; lock $response; logf "Locked response"; undef $response; $error = $self->send($line); unless ( $error or defined $response ) { logf "Waiting for response"; if ( cond_timedwait $response, time() + 60 ) { unless ($response) { logf "Failed to get a positive response"; return; } logf "Got a positive response"; } else { $error = 'Timeout'; logf "Got a timeout"; } } if ($error) { logf "Got error $error"; last; } logf "Unlocking response"; } if ( $error and $message->{'type'} eq 'dispatch' ) { $self->ack( 'transient_failure', $error, $message, $message_reference ); } logf "Unlocking sendable"; } threads::shared version 1.40. perl -V Summary of my perl5 (revision 5 version 10 subversion 0) configuration: Platform: osname=linux, osvers=2.6.32, archname=x86_64-linux-thread-multi uname='linux knorr 2.6.32 #1 smp 2010-04-12 12:31:11 +0200 x86_64 x86_64 x86_64 gnulinux ' config_args='-ds -e -Dprefix=/usr -Dvendorprefix=/usr -Dinstallusrbinperl -Dusethreads -Di_db -Di_dbm -Di_ndbm -Di_gdbm -Duseshrplib=true -Doptimize=-fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -Wall -pipe -Accflags=-DPERL_USE_SAFE_PUTENV' hint=recommended, useposix=true, d_sigaction=define useithreads=define, usemultiplicity=define useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef use64bitint=define, use64bitall=define, uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DPERL_USE_SAFE_PUTENV -DDEBUGGING -fno-strict-aliasing -pipe -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64', optimize='-fmessage-length=0 -O2 -Wall -D_FORTIFY_SOURCE=2 -fstack-protector -funwind-tables -fasynchronous-unwind-tables -g -Wall -pipe', cppflags='-D_REENTRANT -D_GNU_SOURCE -DPERL_USE_SAFE_PUTENV -DDEBUGGING -fno-strict-aliasing -pipe' ccversion='', gccversion='4.3.4 [gcc-4_3-branch revision 152973]', gccosandvers='' intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678 d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16 ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8 alignbytes=8, prototype=define Linker and Libraries: ld='cc', ldflags =' -L/usr/local/lib64' libpth=/lib64 /usr/lib64 /usr/local/lib64 libs=-lm -ldl -lcrypt -lpthread perllibs=-lm -ldl -lcrypt -lpthread libc=/lib64/libc-2.11.1.so, so=so, useshrplib=true, libperl=libperl.so gnulibc_version='2.11.1' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -Wl,-rpath,/usr/lib/perl5/5.10.0/x86_64-linux-thread-multi/CORE' cccdlflags='-fPIC', lddlflags='-shared -L/usr/local/lib64' Characteristics of this binary (from libperl): Compile-time options: DEBUGGING MULTIPLICITY PERL_DONT_CREATE_GVSV PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP PERL_TRACK_MEMPOOL PERL_USE_SAFE_PUTENV USE_64_BIT_ALL USE_64_BIT_INT USE_ITHREADS USE_LARGE_FILES USE_PERLIO USE_REENTRANT_API Built under linux Compiled at May 6 2010 06:53:26 @INC: /usr/lib/perl5/5.10.0/x86_64-linux-thread-multi /usr/lib/perl5/5.10.0 /usr/lib/perl5/site_perl/5.10.0/x86_64-linux-thread-multi /usr/lib/perl5/site_perl/5.10.0 /usr/lib/perl5/vendor_perl/5.10.0/x86_64-linux-thread-multi /usr/lib/perl5/vendor_perl/5.10.0 /usr/lib/perl5/vendor_perl . Linux iac-sles11sp1 2.6.32.12-0.7-default #1 SMP 2010-05-20 11:14:20 +0200 x86_64 x86_64 x86_64 GNU/Linux regards, Matti Linnanvuori
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On 2012-06-14 06:53:14, matti.linnanvuori@portalify.com wrote: Show quoted text
> I think I have found a bug where a thread hangs when leaving a context > and unlocking a locked variable. The code hangs after printing > "Unlocking sendable".
Unfortunately, I cannot work on this problem with the code fragment you submitted. If you can generate a self-contained script that reproduces the problem, that would be extremely helpful.
Closed for lack of response.


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