Arch Linux

I've attached an strace of apachectl -k start FWIW: http://pastebin.com/EqTrhyVT

Same exact thing happens to me on Arch on arm - on a 100% fresh and updated install, where the only change made to the stock apache config is the line for loading mod_perl. The stack trace from the core file:

(gdb) bt
#0 0x40a3b270 in modperl_env_clear () from /etc/httpd/modules/mod_perl.so
#1 0x40a2bf58 in ?? () from /etc/httpd/modules/mod_perl.so
Cannot access memory at address 0x0
#2 0x40a2bf58 in ?? () from /etc/httpd/modules/mod_perl.so
Cannot access memory at address 0x0
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

apache 2.2.19-1 and mod_perl 2.0.5-6

Are you using worker or prefork? mod_perl 2.0.5 won't work together with the worker mpm when perl 5.14 is used. In that case this bug is already solved in a development snapshot of mod_perl.

It's all default config other than loading mod_perl, so prefork unless I'm missing something here:

$ apachectl -l
Compiled in modules:
core.c
prefork.c
http_core.c
mod_so.c

I can also confirm that my apache server is using prefork

I believe that the arch compiles prefork into apache by default

[me@host:~] httpd -l
Compiled in modules:
core.c
prefork.c
http_core.c
mod_so.c

I can't reproduce your crash on x86_64. mod_perl loads fine here. Where did you place the LoadModule exactly?

Right after all other LoadModule commands:

diff httpd.conf httpd.conf.orig
121d120
< LoadModule perl_module modules/mod_perl.so

Complete http.conf is at http://pastie.org/2164269 but that was literally the only change.

Note that I'm running this on ARM so 32-bit...

Just deployed a fresh ArchLinux64 with apache and mod_perl

Everything worked fine; can't seem to reproduce on 64 bit.

FWIW; all of my tests have been done on a xen-based VPS

So what officially supported platform is it that fails? i686 or x86_64? ARM is not supported.

Fair point - I meant to file it with archlinuxarm.org but then bumped into this and figured the problem could me more generic. I'll try it out on a 32-bit x86 in a few days and report how it goes.

I can confirm that this fails on the i686 officially supported platform, but does not fail on x86_64

I have mod_perl working fine on x86_64 but apache seg faults on i686.

I can confirm that this fails on i686.
I tried to remake perl & mod_perl, and latest dev version of mod_perl, with the same segmentation fault at httpd start.

Yeah, it's segfaulting for me on a freshly installed and fully updated i686 as well. The stack trace:


(gdb) bt
#0 0xb7102cf4 in modperl_env_clear () from /etc/httpd/modules/mod_perl.so
#1 0xb70f0f3a in ?? () from /etc/httpd/modules/mod_perl.so
#2 0xb704b601 in Perl_leave_scope () from /usr/lib/perl5/core_perl/CORE/libperl.so
#3 0xb704c5a3 in Perl_pop_scope () from /usr/lib/perl5/core_perl/CORE/libperl.so
#4 0xb6fab341 in perl_parse () from /usr/lib/perl5/core_perl/CORE/libperl.so
#5 0xb70f12f6 in modperl_startup () from /etc/httpd/modules/mod_perl.so
#6 0xb70f126c in modperl_startup () from /etc/httpd/modules/mod_perl.so
#7 0xb70f17a6 in modperl_init () from /etc/httpd/modules/mod_perl.so
#8 0xb70f195e in modperl_hook_init () from /etc/httpd/modules/mod_perl.so
#9 0x08079689 in ap_run_open_logs ()
#10 0x08064a1a in main ()

Same versions of apache and mod_perl as above: apache 2.2.19-1 and mod_perl 2.0.5-6, perl 5.14.1-1

I just checked out the latest mod_perl subversion (r1143539) and compiled/installed and this bug still exists on i686 with the latest version in svn:

:: Restarting Apache Web Server[BUSY]
/usr/sbin/apachectl: line 84: 678 Segmentation fault $HTTPD -k $ARGV [FAIL]

This is probably similar to the issues seen in  FS#24540  and  FS#24577 - I'm guessing CFLAGS are involved somehow, and we only saw those break on i686 as well.

I am experiencing the same issue on i686 as soon as mod_perl is introduced.

/usr/sbin/apachectl: line 84: 13947 Segmentation fault $HTTPD -k $ARGV

I can confirm this issue on i686 as well with apache 2.2.19-1 and mod_perl 2.0.5-7.

/usr/sbin/apachectl: line 84: 1351 Segmentation fault $HTTPD -k $ARGV

dmesg shows:
httpd[1351]: segfault at d ip b720bcf4 sp bf89f2e0 error 4 in mod_perl.so[b71ee000+34000]

Guys, this isn't the Ubuntu bugtracker. We don't need or want useless confirmation of an already confirmed bug.

Applied a patch from openSUSE which appears to solve these segfaults.

A couple of confirmations that the issue doesn't exist in mod_perl 2.0.5-8 would be nice. :)

Works for me in mod_perl 2.0.5-8 with i686 . \o/

Thanks so much !!!

I can also confirm, mod_perl 2.0.5-8 solves this issue. Huge thanks!