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hackingbear at hotmail

Aug 20, 2012, 1:36 PM


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mod_perl always segfault on thread creation

hi,

This is totally frustrating. My mod_perl script always causes segmentation fault when it tries to create a thread. I searched the Web and this forum, but there is still no definitive answers. My perl and mod_perl are of pretty recent versions and I check for the inclusion of useithreads config. I wrote a simple script to prove it:

use CGI;
use threads;
use Config;
use mod_perl;

our $LOGGER;
BEGIN {
$LOGGER = Apache2::ServerUtil->server->log;
$LOGGER->error("testhread starting (CGI version ".CGI->version.")");
}

my $q = CGI->new;
my $check = defined $Config{useithreads};
$LOGGER->error("useithread? $check");
my $v = mod_perl->VERSION;
$LOGGER->error("version $v");

my $thr = threads->create(sub { }); # comment out these two lines will work
$thr->join(); # already crashed at the line above

$q->header(-status => '200 OK');

It produces logs

Aug 20 13:07:50 (4216) [error] testhread starting (CGI version 3.51)
Aug 20 13:07:50 (4216) [error] useithread? 1
Aug 20 13:07:50 (4216) [error] version 2.000004
Aug 20 13:07:51 (4159) [notice] child pid 4216 exit signal Segmentation fault (11)

Any way I can solve this?

Thanks!

(Perl -V)
Summary of my perl5 (revision 5 version 10 subversion 1) configuration:

Platform:
osname=linux, osvers=2.6.18-274.3.1.el5, archname=x86_64-linux-thread-multi
uname='linux hs20-bc2-5.build.redhat.com 2.6.18-274.3.1.el5 #1 smp fri aug 26 18:49:02 edt 2011 x86_64 x86_64 x86_64 gnulinux '
config_args='-des -Doptimize=-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic -DDEBUGGING=-g -Dversion=5.10.1 -Dmyhostname=localhost -Dperladmin=root [at] localhos -Dcc=gcc -Dcf_by=Red Hat, Inc. -Dprefix=/usr -Dvendorprefix=/usr -Dsiteprefix=/usr/local -Dsitelib=/usr/local/share/perl5 -Dsitearch=/usr/local/lib64/perl5 -Dprivlib=/usr/share/perl5 -Darchlib=/usr/lib64/perl5 -Dvendorlib=/usr/share/perl5/vendor_perl -Dvendorarch=/usr/lib64/perl5/vendor_perl -Dinc_version_list=5.10.0 -Darchname=x86_64-linux-thread-multi -Dlibpth=/usr/local/lib64 /lib64 /usr/lib64 -Duseshrplib -Dusethreads -Duseithreads -Duselargefiles -Dd_dosuid -Dd_semctl_semun -Di_db -Ui_ndbm -Di_gdbm -Di_shadow -Di_syslog -Dman3ext=3pm -Duseperlio -Dinstallusrbinperl=n -Ubincompat5005 -Uversiononly -Dpager=/usr/bin/less -isr -Dd_gethostent_r_proto -Ud_endhostent_r_proto -Ud_sethostent_r_proto -Ud_endprotoent_r_proto -Ud_setprotoent_r_proto -Ud_endservent_r_proto -Ud_setservent_r_proto -Dscriptdir=/usr/bin'
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='gcc', ccflags ='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
optimize='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic',
cppflags='-D_REENTRANT -D_GNU_SOURCE -fno-strict-aliasing -pipe -fstack-protector -I/usr/local/include'
ccversion='', gccversion='4.4.5 20110214 (Red Hat 4.4.5-6)', 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='gcc', ldflags =' -fstack-protector'
libpth=/usr/local/lib64 /lib64 /usr/lib64
libs=-lresolv -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread -lc
perllibs=-lresolv -lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
libc=, so=so, useshrplib=true, libperl=libperl.so
gnulibc_version='2.12'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E -Wl,-rpath,/usr/lib64/perl5/CORE'
cccdlflags='-fPIC', lddlflags='-shared -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic'
Characteristics of this binary (from libperl):
Compile-time options: MULTIPLICITY PERL_DONT_CREATE_GVSV
PERL_IMPLICIT_CONTEXT PERL_MALLOC_WRAP USE_64_BIT_ALL
USE_64_BIT_INT USE_ITHREADS USE_LARGE_FILES
USE_PERLIO USE_REENTRANT_API
Built under linux
Compiled at Oct 4 2011 10:53:24
@INC:
/usr/local/lib64/perl5
/usr/local/share/perl5
/usr/lib64/perl5/vendor_perl
/usr/share/perl5/vendor_perl
/usr/lib64/perl5
/usr/share/perl5

Subject User Time
mod_perl always segfault on thread creation hackingbear at hotmail Aug 20, 2012, 1:36 PM
    RE: mod_perl always segfault on thread creation rsharma51 at sapient Aug 20, 2012, 11:41 PM
    RE: mod_perl always segfault on thread creation hackingbear at hotmail Aug 22, 2012, 4:04 PM
        RE: mod_perl always segfault on thread creation dhunt at ucar Aug 22, 2012, 4:11 PM
    RE: mod_perl always segfault on thread creation hackingbear at hotmail Aug 22, 2012, 4:16 PM
        Re: mod_perl always segfault on thread creation dmn at debian Aug 22, 2012, 11:17 PM
            RE: mod_perl always segfault on thread creation hackingbear at hotmail Aug 23, 2012, 4:38 PM
                RE: mod_perl always segfault on thread creation dhunt at ucar Aug 24, 2012, 9:36 AM
    RE: mod_perl always segfault on thread creation hackingbear at hotmail Aug 24, 2012, 10:29 AM
        RE: mod_perl always segfault on thread creation dhunt at ucar Aug 24, 2012, 11:54 AM

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