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Bug #70004 PHP segfaults on exit when imagick is loaded
Submitted: 2015-07-07 02:27 UTC Modified: 2015-07-07 12:36 UTC
From: charlie at atechmedia dot com Assigned:
Status: Closed Package: imagick (PECL)
PHP Version: 5.6.10 OS: Linux 3.11.0-26 Ubuntu LXC
Private report: No CVE-ID: None
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 [2015-07-07 02:27 UTC] charlie at atechmedia dot com 
Description:
------------
PHP 5.6.10 (also 5.6.9)
Ubuntu 14.04 running in LXC container
Linux 3.11.0-26-generic #45~precise1-Ubuntu
ImageMagick 6.9.0-10 Q16 x86_64 2015-03-09 http://www.imagemagick.org
imagick 3.1.2 (also 3.1.1, 3.1.0, 3.3.0RC2)

PHP dies with a segmentation fault when it exits.

Stack trace included below. This is possibly a duplicate of #59339 which was closed as a kernel issue.


Test script:
---------------
This bug occurs when executing no code.

Actual result:
--------------
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x00007f76880e38fc in gvFreeContext () from /usr/lib/libgvc.so.6
(gdb) bt
#0  0x00007f76880e38fc in gvFreeContext () from /usr/lib/libgvc.so.6
#1  0x00007f768ad0c27c in UnregisterDOTImage () at coders/dot.c:243
#2  0x00007f768ac9b97f in UnregisterStaticModules () at magick/static.c:384
#3  0x00007f768ac2d51a in MagickCoreTerminus () at magick/magick.c:1389
#4  0x00007f768b2369e2 in MagickWandTerminus () at wand/magick-wand.c:1035
#5  0x00007f768b4ed628 in zm_shutdown_imagick (type=<optimised out>, module_number=52)
    at /tmp/pear/temp/imagick/imagick.c:2772
#6  0x000000000082c4a3 in module_destructor (module=0x305d4a0) at /tmp/php-5.6.10/Zend/zend_API.c:2376
#7  0x0000000000831726 in i_zend_hash_bucket_delete (p=0x307eff0, ht=0x116a740 <module_registry>)
    at /tmp/php-5.6.10/Zend/zend_hash.c:182
#8  zend_hash_bucket_delete (ht=ht@entry=0x116a740 <module_registry>, p=0x307eff0) at /tmp/php-5.6.10/Zend/zend_hash.c:192
#9  0x0000000000832e88 in zend_hash_graceful_reverse_destroy (ht=0x116a740 <module_registry>)
    at /tmp/php-5.6.10/Zend/zend_hash.c:613
#10 0x000000000082adac in zend_destroy_modules () at /tmp/php-5.6.10/Zend/zend_API.c:1894
#11 0x0000000000824fdf in zend_shutdown () at /tmp/php-5.6.10/Zend/zend.c:836
#12 0x00000000007c43fb in php_module_shutdown () at /tmp/php-5.6.10/main/main.c:2461
#13 0x0000000000437c76 in main (argc=1, argv=0x2fbba90) at /tmp/php-5.6.10/sapi/cli/php_cli.c:1393

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 [2015-07-07 02:53 UTC] charlie at atechmedia dot com 
Possibly a duplicate of: https://bugs.php.net/bug.php?id=59752

I will try building IM without OpenMP to confirm.
 [2015-07-07 12:35 UTC] charlie at atechmedia dot com 
This does not appear to be a bug in PHP or imagick. It is also not a problem with OpenMP.

The crash is reproducible in "convert". It appears to be a bug in gvc and compiling imagemagick --with-gvc=no resolves the problem.
 [2015-07-07 12:36 UTC] charlie at atechmedia dot com
-Status: Open +Status: Closed
 [2015-07-07 12:36 UTC] charlie at atechmedia dot com 
I'm closing this as the bug isn't specific to PHP.
 
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