Ubuntu
xcache package

php seg faults if both php5-xcache and php-apc installed

Bug #681167 reported by R. Tolga Korkunçkaya
12
This bug affects 2 people
Affects Status Importance Assigned to Milestone
php-apc (Ubuntu)
Confirmed
Low
Unassigned
php5 (Ubuntu)
Confirmed
Low
Unassigned
xcache (Ubuntu)
Fix Released
Low
Unassigned

Bug Description

Binary package hint: php5

There is a conflict in package dependencies for php5-xcache and php-apc packages. They both can be installed without warning, but php gives a segmentation fault with both installed.

Here is the error message:

PHP Warning: Cannot load module 'XCache' because conflicting module 'apc' is already loaded in Unknown on line 0
Segmentation fault

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: php5 5.3.3-1ubuntu9.1
ProcVersionSignature: Ubuntu 2.6.35-22.33-generic 2.6.35.4
Uname: Linux 2.6.35-22-generic i686
Architecture: i386
Date: Wed Nov 24 14:44:49 2010
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: php5

Revision history for this message
R. Tolga Korkunçkaya (tolga) wrote :
Chuck Short (zulcss)
affects: php5 (Ubuntu) → xcache (Ubuntu)
Revision history for this message
Michal Čihař (nijel) wrote :

The segfault is clearly a PHP bug, xcache module properly defines this conflict and PHP should just fail to load it.

Revision history for this message
Michal Čihař (nijel) wrote :

I've just commited conflict to php5-xcache package, fix will be part of next upload.

Changed in xcache (Ubuntu):
status: New → Fix Committed
Revision history for this message
Clint Byrum (clint-fewbar) wrote :

I do agree that the two should conflict, but the segfault is a different issue that may still be a problem with xcache:

(gdb) run
Starting program: /usr/bin/php
[Thread debugging using libthread_db enabled]
PHP Warning: Cannot load module 'XCache' because conflicting module 'apc' is already loaded in Unknown on line 0

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff561de50 in ?? ()
(gdb) bt
#0 0x00007ffff561de50 in ?? ()
#1 0x000000000068fa69 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /build/buildd/php5-5.3.3/Zend/zend.c:1258
#2 0x000000000063ca73 in php_execute_script (primary_file=0x7fffffffdd30) at /build/buildd/php5-5.3.3/main/main.c:2288
#3 0x0000000000729694 in main (argc=-5000, argv=0x0) at /build/buildd/php5-5.3.3/sapi/cli/php_cli.c:1196

Still I think its most likely that PHP or php-apc is handling the error condition poorly since xcache clearly isn't getting loaded.

Interestingly enough, php -i does not segfault, so its only when we try to execute a script.

Marking Confirmed in php5 *and* php-apc. Setting Importance to Low, since there are very few conflicting zend caching modules.

Changed in php5 (Ubuntu):
status: New → Confirmed
importance: Undecided → Low
Changed in xcache (Ubuntu):
importance: Undecided → Low
Changed in php-apc (Ubuntu):
status: New → Confirmed
importance: Undecided → Low
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package xcache - 1.3.1-2

---------------
xcache (1.3.1-2) experimental; urgency=low

  * Add conflict with php-apc (LP: #681167).

xcache (1.3.1-1) experimental; urgency=low

  * New upstream version.
  * Fix privileges on installed PHP files.
 -- Daniel Bond <email address hidden> Wed, 08 Dec 2010 21:33:46 +0000

Changed in xcache (Ubuntu):
status: Fix Committed → Fix Released
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