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From Doug Hunt <dh...@ucar.edu>
Subject RE: mod_perl always segfault on thread creation
Date Wed, 22 Aug 2012 23:11:32 GMT
Hi Rommel:  Are you building statically or dynamically?  I had a problem 
with segfaulting mod_perl, the solution for which eluded me for a long 
time.  I had been doing a static apache/mod_perl build on CentOS 6.3 
(similar to RedHat Enterprise 6.3).

I finally cured the problem by just doing a dynamic build instead.  From 
what I can tell, static builds in my environment (x86_64, CentOS 6.3, perl 
5.16.1) are pretty well broken.  The dynamic build went just fine.

Just a thought...

--Doug Hunt

dhunt@ucar.edu
Software Engineer
UCAR - COSMIC, Tel. (303) 497-2611

On Wed, 22 Aug 2012, hack bear wrote:

> Thanks but the trick doesn't seem to help.
> 
> First the instruction seems wrong. With it, the resulting perl executable does not even
have useithreads defined.
> 
> Then I try
> 
> CFLAGS='-m64 -mtune=nocona' ./Configure -Dinstallusrbinperl -Dusethreads -Duseithreads
-Dprefix=/usr -des -A ccflags="-fPIC
> -m64 -mtune=nocona "
> 
> Now I get a perl with useithread and -mtune=nocona (versus -mtune=generic)
> 
> # perl -V
> Summary of my perl5 (revision 5 version 16 subversion 1) configuration:
>   
>   Platform:
>     osname=linux, osvers=2.6.32-131.12.1.el6.x86_64, archname=x86_64-linux-thread-multi
>     uname='linux alcatraz6 2.6.32-131.12.1.el6.x86_64 #1 smp wed sep 21 08:12:51 pdt
2011 x86_64 x86_64 x86_64 gnulinux '
>     config_args='-Dinstallusrbinperl -Dusethreads -Duseithreads -Dprefix=/usr -des
-A ccflags=-fPIC -m64 -mtune=nocona '
>     hint=previous, 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 -fPIC -fno-strict-aliasing -pipe
-fstack-protector -I/usr/local/include
> -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -fPIC -m64 -mtune=nocona',
> 
> Then I install the perl build, build mod_perl and install. Verify I'm using the new versions
in apache. But still the script
> produces segfault consistently.
> 
> Did people ever get threads to work in mod_perl/apache/redhat enterprise linux 6? May
someone send the "perl -V" output. This
> basic feature should work out of box on any environment.
> 
> 
> _______________________________________________________________________________________________________________________________
> From: rsharma51@sapient.com
> To: hackingbear@hotmail.com; modperl@perl.apache.org
> Subject: RE: mod_perl always segfault on thread creation
> Date: Tue, 21 Aug 2012 06:41:09 +0000
> 
> Hi,
> 
>  
> 
> You could try some options for configuring Perl given here:
> 
> http://perl.apache.org/docs/2.0/user/install/install.pod.orig
> 
>  
> 
> specially:
> 
> % CFLAGS='-m64 -mtune=nocona' ./Configure -des -A ccflags=-fPIC
> 
>  
> 
> Before doing a make.
> 
>  
> 
> Thanks,
> 
> Rommel.
> 
>  
> 
>  
> 
> From: hack bear [mailto:hackingbear@hotmail.com]
> Sent: Tuesday, August 21, 2012 2:06 AM
> To: modperl@perl.apache.org
> Subject: 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@localhost
> -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
> 
> 
>
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