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[SOLVED] apache2 segfaults on php -> zlib
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myak
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Location: Cracow, PL

PostPosted: Tue Mar 20, 2012 10:11 pm    Post subject: [SOLVED] apache2 segfaults on php -> zlib Reply with quote

(Really) Long story short: I have apache2 with php installed, I tried running modx on it and apache's error_log tells me that the child process segfaults:
Code:
[Tue Mar 20 22:51:51 2012] [notice] child pid 31990 exit signal Segmentation fault (11), possible coredump in /tmp/apache-cores/

I think phpmyadmin gives the same results but haven't tried with coredumps. It's random too, the very same page will get served correctly and then after a refresh the process will crash. I enabled core dumps and here's what I get out of gdb /usr/sbin/apache2 core:


Code:
#0  0x00007f3d654a99b0 in deflateEnd () from /lib64/libz.so.1
(gdb) where
#0  0x00007f3d654a99b0 in deflateEnd () from /lib64/libz.so.1
#1  0x00007f3d61caee92 in ?? () from /usr/lib64/apache2/modules/libphp5.so
#2  0x00007f3d61caeef6 in ?? () from /usr/lib64/apache2/modules/libphp5.so
#3  0x00007f3d61ef0568 in zend_deactivate_modules () from /usr/lib64/apache2/modules/libphp5.so
#4  0x00007f3d61e7fc0a in php_request_shutdown () from /usr/lib64/apache2/modules/libphp5.so
#5  0x00007f3d61fa65e7 in ?? () from /usr/lib64/apache2/modules/libphp5.so
#6  0x000000000043b397 in ap_run_handler ()
#7  0x000000000043b7bc in ap_invoke_handler ()
#8  0x00000000004485a0 in ap_process_request ()
#9  0x00000000004456e0 in ?? ()
#10 0x0000000000441b27 in ap_run_process_connection ()
#11 0x000000000044e06e in ?? ()
#12 0x00007f3d6809cd0c in start_thread () from /lib64/libpthread.so.0
#13 0x00007f3d67bdf8dd in clone () from /lib64/libc.so.6


I reemerged zlib and pretty much everything related on the stack trace (php, apache, I even went as far as to reemerge glibc). Nothing helped.

Possibly relevant:
I updated to php 5.4 from 5.3 today, didn't use it before so can't say if I had issues with it or not.
zlib was installed with static-libs, I reemerged with -static-libs in a quest to solve this.
My CFLAGS aren't aggressive at all:
Code:
CFLAGS="-O2 -pipe -march=core2 -fomit-frame-pointer"


I am using ~amd64, USE flags here:
Code:
USE="-ipv6 mmx sse sse2 X aac a52 aalib acl acpi -aim alsa"
USE="$USE kde bash-completion bzip2 -bluetooth branding cairo cddb cdr"
USE="$USE cgi css cups curl cxx java6 java jabber -icq lame ldap lm_sensors"
USE="$USE mp3 -msn mplayer -networkmanager mysql mysqli ncurses nsplugin"
USE="$USE offsensive ogg opengl php pdf plasma qt4 rdesktop samba -scanner"
USE="$USE session sound win32codecs zsh-completion -yahoo ffmpeg"
USE="$USE nvidia semantic-desktop -accessibility -qt3support"
USE="$USE drm jpeg2k icu -perl -gnome upnp -ldap 3dnow 3dnowext mmxext"
USE="$USE -pulseaudio threads theora apache2 php gd truetype zip"
USE="$USE thumbnail fbcondecor git subversion btrfs fat ntfs ebook"
USE="$USE ipod lastfm mp3tunes acct lzma pdo"

(Yeah. First Gentoo installation in 5+ years so forgive me ;)

Emerging php with -zlib (and depending) -gd -truetype -exif seems to fix the issue but that's not really something I want. Any ideas as to what might be causing it?
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Marcin Jakubowski


Last edited by myak on Tue Mar 27, 2012 6:20 am; edited 1 time in total
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Mad Merlin
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PostPosted: Mon Mar 26, 2012 11:58 pm    Post subject: Reply with quote

PHP 5.4 is pretty bleeding edge at this point. At this point I would try and see if it happens with 5.3 as well. If not, it's probably a PHP bug that you should report and let the PHP developers handle.

Edit: The backtrace would be much more useful if you built debug symbols (hint: FEATURES=splitdebug).

Edit2: What Apache MPM are you using? If anything other than mod_prefork, try mod_prefork first.
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myak
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Location: Cracow, PL

PostPosted: Tue Mar 27, 2012 6:19 am    Post subject: Reply with quote

Switching to 5.3 seems to have fixed the issue, thanks a lot! On the MPM - I don't know honestly.
Code:
[ebuild   R    ] www-servers/apache-2.2.21-r2  USE="ssl threads -debug -doc -ldap (-selinux) -static -suexec" APACHE2_MODULES="actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias -asis -auth_digest -authn_dbd -cern_meta -charset_lite -dbd -dumpio -ident -imagemap -log_forensic -proxy -proxy_ajp -proxy_balancer -proxy_connect -proxy_ftp -proxy_http -proxy_scgi -reqtimeout -substitute -version" APACHE2_MPMS="-event -itk -peruser -prefork -worker" 0 kB


Seems as if no MPM was selected so... the default one? Or none? It's just a server for me to play with some CMS solutions, not a production one, I pretty much emerged apache, mysql and php :)

I'm rebuilding apache, php and zlib with splitdebug, I'll report to php guys if the error is still there.
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Mad Merlin
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PostPosted: Tue Mar 27, 2012 3:14 pm    Post subject: Reply with quote

I'm 99.9% sure the default MPM is prefork, so you're good there.
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