[perl #60724] Segmentation fault in Perl_csighandler when receiving SIGCHLD during thread creation

From:

Pascal Hofmann

Date:

November 21, 2008 02:55

Subject:

[perl #60724] Segmentation fault in Perl_csighandler when receiving SIGCHLD during thread creation

Message ID:

rt-3.6.HEAD-10965-1227256791-888.60724-75-0@perl.org

# New Ticket Created by Pascal Hofmann # Please include the string: [perl #60724] # in the subject line of all future correspondence about this issue. # <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=60724 > I'have a program which uses threads and has a custom signal handler for SIGCHLD. If a SIGCHLD is received during thread creation perl produces a segfault. Here is the stacktrace from two gdb-sessions: Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0xb7ee08c0 (LWP 1328)] 0x0809ad07 in Perl_csighandler () (gdb) bt #0 0x0809ad07 in Perl_csighandler () #1 <signal handler called> #2 0xb7f8538c in ?? () from /lib/tls/i686/cmov/libc.so.6 #3 0xb7f86865 in malloc () from /lib/tls/i686/cmov/libc.so.6 #4 0x0809498c in Perl_safesysmalloc () #5 0x080a8373 in Perl_av_extend () #6 0x080a8e13 in Perl_av_store () #7 0x080a9523 in Perl_av_push () #8 0x080cc700 in perl_clone () #9 0xb7dbafc4 in XS_threads_create () from /usr/lib/perl/5.10/auto/threads/threads.so #10 0x080b3f02 in Perl_pp_entersub () #11 0x080b22e9 in Perl_runops_standard () #12 0x080b0750 in perl_run () #13 0x08063ebd in main () --------------------------------------------- Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0xb7df18c0 (LWP 16487)] 0x0809ad07 in Perl_csighandler () (gdb) bt #0 0x0809ad07 in Perl_csighandler () #1 <signal handler called> #2 0xb7e9cb56 in memcpy () from /lib/tls/i686/cmov/libc.so.6 #3 0x09804638 in ?? () #4 0x080bc91f in Perl_sv_dup () #5 0x080bd13d in Perl_sv_dup () #6 0x080bd13d in Perl_sv_dup () #7 0x080bd196 in Perl_sv_dup () #8 0x080bdfa1 in Perl_gp_dup () #9 0x080bd2c6 in Perl_sv_dup () #10 0x080a73da in Perl_he_dup () #11 0x080bcd54 in Perl_sv_dup () #12 0x080bc970 in Perl_sv_dup () #13 0x080bda18 in Perl_rvpv_dup () #14 0x080bcfb7 in Perl_sv_dup () #15 0x080bdeaa in Perl_gp_dup () #16 0x080bd2c6 in Perl_sv_dup () #17 0x080bd13d in Perl_sv_dup () #18 0x080bd13d in Perl_sv_dup () #19 0x080bd196 in Perl_sv_dup () #20 0x080bd093 in Perl_sv_dup () #21 0x080bda18 in Perl_rvpv_dup () #22 0x080bc91f in Perl_sv_dup () #23 0x080a73da in Perl_he_dup () #24 0x080bcd54 in Perl_sv_dup () #25 0x080bdf59 in Perl_gp_dup () #26 0x080bd2c6 in Perl_sv_dup () #27 0x080bd13d in Perl_sv_dup () #28 0x080bd13d in Perl_sv_dup () #29 0x080bd196 in Perl_sv_dup () #30 0x080bdfa1 in Perl_gp_dup () #31 0x080bd2c6 in Perl_sv_dup () #32 0x080a73da in Perl_he_dup () #33 0x080bcd54 in Perl_sv_dup () #34 0x080bdf59 in Perl_gp_dup () #35 0x080bd2c6 in Perl_sv_dup () #36 0x080a73da in Perl_he_dup () #37 0x080bcd54 in Perl_sv_dup () #38 0x080bca54 in Perl_sv_dup () #39 0x080bdfa1 in Perl_gp_dup () #40 0x080bd2c6 in Perl_sv_dup () #41 0x080a73da in Perl_he_dup () #42 0x080bcd54 in Perl_sv_dup () #43 0x080bca54 in Perl_sv_dup () #44 0x080bdfa1 in Perl_gp_dup () #45 0x080bd2c6 in Perl_sv_dup () #46 0x080a73da in Perl_he_dup () #47 0x080bcd54 in Perl_sv_dup () #48 0x080bc970 in Perl_sv_dup () #49 0x080bded5 in Perl_gp_dup () #50 0x080bd2c6 in Perl_sv_dup () #51 0x080bd13d in Perl_sv_dup () #52 0x080bd13d in Perl_sv_dup () #53 0x080bd196 in Perl_sv_dup () #54 0x080bdfa1 in Perl_gp_dup () #55 0x080bd2c6 in Perl_sv_dup () #56 0x080a73da in Perl_he_dup () #57 0x080bcd54 in Perl_sv_dup () #58 0x080bdf59 in Perl_gp_dup () #59 0x080bd2c6 in Perl_sv_dup () #60 0x080a73da in Perl_he_dup () #61 0x080a7380 in Perl_he_dup () #62 0x080a7380 in Perl_he_dup () #63 0x080bcd54 in Perl_sv_dup () #64 0x080bca54 in Perl_sv_dup () #65 0x080bdfa1 in Perl_gp_dup () #66 0x080bd2c6 in Perl_sv_dup () #67 0x080a73da in Perl_he_dup () #68 0x080bcd54 in Perl_sv_dup () #69 0x080bd2ab in Perl_sv_dup () #70 0x080cc2cc in perl_clone () #71 0xb7ccbfc4 in XS_threads_create () from /usr/lib/perl/5.10/auto/threads/threads.so #72 0x080b3f02 in Perl_pp_entersub () #73 0x080b22e9 in Perl_runops_standard () #74 0x080b0750 in perl_run () #75 0x08063ebd in main () --- Flags: category= severity= --- Site configuration information for perl 5.10.0: Configured by Debian Project at Thu Jul 24 09:01:44 UTC 2008. Summary of my perl5 (revision 5 version 10 subversion 0) configuration: Platform: osname=linux, osvers=2.6.24-15-server, archname=i486-linux-gnu-thread-multi uname='linux palmer 2.6.24-15-server #1 smp tue apr 8 01:08:17 utc 2008 i686 gnulinux ' config_args='-Dusethreads -Duselargefiles -Dccflags=-DDEBIAN -Dcccdlflags=-fPIC -Darchname=i486-linux-gnu -Dprefix=/usr -Dprivlib=/usr/share/perl/5.10 -Darchlib=/usr/lib/perl/5.10 -Dvendorprefix=/usr -Dvendorlib=/usr/share/perl5 -Dvendorarch=/usr/lib/perl5 -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl/5.10.0 -Dsitearch=/usr/local/lib/perl/5.10.0 -Dman1dir=/usr/share/man/man1 -Dman3dir=/usr/share/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Dsiteman3dir=/usr/local/man/man3 -Dman1ext=1 -Dman3ext=3perl -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm -Uusesfio -Uusenm -DDEBUGGING=-g -Doptimize=-O2 -Duseshrplib -Dlibperl=libperl.so.5.10.0 -Dd_dosuid -des' hint=recommended, useposix=true, d_sigaction=define useithreads=define, usemultiplicity=define useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef use64bitint=undef, use64bitall=undef, uselongdouble=undef usemymalloc=n, bincompat5005=undef Compiler: cc='cc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64', optimize='-O2 -g', cppflags='-D_REENTRANT -D_GNU_SOURCE -DDEBIAN -fno-strict-aliasing -pipe -I/usr/local/include' ccversion='', gccversion='4.3.1', 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 /usr/lib64 libs=-lgdbm -lgdbm_compat -ldb -ldl -lm -lpthread -lc -lcrypt perllibs=-ldl -lm -lpthread -lc -lcrypt libc=/lib/libc-2.8.90.so, so=so, useshrplib=true, libperl=libperl.so.5.10.0 gnulibc_version='2.8.90' Dynamic Linking: dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E' cccdlflags='-fPIC', lddlflags='-shared -O2 -g -L/usr/local/lib' Locally applied patches: --- @INC for perl 5.10.0: /etc/perl /usr/local/lib/perl/5.10.0 /usr/local/share/perl/5.10.0 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl . --- Environment for perl 5.10.0: HOME=/home/pascal LANG=de_DE.UTF-8 LANGUAGE=de LD_LIBRARY_PATH (unset) LOGDIR (unset) PATH=/home/pascal/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games PERL_BADLANG (unset) SHELL=/bin/bash

[perl #60724] Segmentation fault in Perl_csighandler when receiving SIGCHLD during thread creation by Pascal Hofmann

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