Edit report at https://bugs.php.net/bug.php?id=65200&edit=1
ID: 65200 Updated by: a...@php.net Reported by: mmucklo at corp dot oodle dot com Summary: Seg faults in php_free_pcre_cache on child exit Status: Feedback Type: Bug Package: *General Issues Operating System: RHEL 6.4 PHP Version: 5.4.16 Block user comment: N Private report: N New Comment: >From what i could analyse yet, this issue locale related. It happens on >prefork child shutdown, so also PHP module shutdown. From this point not very bad. The PCRE patterns are cached by locale, so it might be reproduceable with a scenario like this - set locale - do some pcre stuff - change locale - do some pcre stuff ....... This is most likely a race condition in MSHUTDOWN while freeing PCRE cache under Apache prefork. You could try a simple script with this scenario. I'll be doing the same in the meantime. Or maybe you recognize this pattern in your app? Unfortunately that's all I could read from the BT so far. Thanks Previous Comments: ------------------------------------------------------------------------ [2013-07-06 00:59:14] mmucklo at corp dot oodle dot com It's probably not possible to boil into a single script as we're running symfony2 which is pulling in probably hundreds of files and various dependencies just to generate a single page. It does seem to happen rather consistently under simple manual testing of our site on a QA machine. Is there anything else we can do to help isolate the issue? ------------------------------------------------------------------------ [2013-07-04 06:36:07] a...@php.net Thank you for this bug report. To properly diagnose the problem, we need a short but complete example script to be able to reproduce this bug ourselves. A proper reproducing script starts with <?php and ends with ?>, is max. 10-20 lines long and does not require any external resources such as databases, etc. If the script requires a database to demonstrate the issue, please make sure it creates all necessary tables, stored procedures etc. Please avoid embedding huge scripts into the report. ------------------------------------------------------------------------ [2013-07-03 23:18:56] mmucklo at corp dot oodle dot com Description: ------------ Seeing regular Seg faults during child process clean up. Apache 2.2.24 PHP 5.4.16 Backtrace: Core was generated by `/service/local/apache/bin/httpd -f /service/conf/httpd.qvc.conf'. Program terminated with signal 6, Aborted. #0 0x00000031d26328a5 in raise () from /lib64/libc.so.6 Missing separate debuginfos, use: debuginfo-install cyrus-sasl-lib-2.1.23- 13.el6_3.1.x86_64 glibc-2.12-1.107.el6.x86_64 libgcc-4.4.7-3.el6.x86_64 libstdc++-4.4.7-3.el6.x86_64 nss-softokn-freebl-3.12.9-11.el6.x86_64 (gdb) bt #0 0x00000031d26328a5 in raise () from /lib64/libc.so.6 #1 0x00000031d2634085 in abort () from /lib64/libc.so.6 #2 0x00000031d26707b7 in __libc_message () from /lib64/libc.so.6 #3 0x00000031d26760e6 in malloc_printerr () from /lib64/libc.so.6 #4 0x00000031d267656d in malloc_consolidate () from /lib64/libc.so.6 #5 0x00000031d2678ba8 in _int_free () from /lib64/libc.so.6 #6 0x00007fbc90e882f3 in php_free_pcre_cache (data=0x3c9c220) at /workspace/source/external/build/php-5.4.16-apache/ext/pcre/php_pcre.c:96 #7 0x00007fbc913a8453 in zend_hash_destroy (ht=0x7fbc91c48060) at /workspace/source/external/build/php-5.4.16-apache/Zend/zend_hash.c:560 #8 0x00007fbc90e88382 in zm_globals_dtor_pcre (pcre_globals=0x7fbc91c48060) at /workspace/source/external/build/php-5.4.16-apache/ext/pcre/php_pcre.c:113 #9 0x00007fbc9139fe71 in module_destructor (module=0x1d80480) at /workspace/source/external/build/php-5.4.16-apache/Zend/zend_API.c:2308 #10 0x00007fbc913a8840 in zend_hash_apply_deleter (ht=0x7fbc91c50480, p=0x1d80420) at /workspace/source/external/build/php-5.4.16- apache/Zend/zend_hash.c:650 #11 0x00007fbc913a89db in zend_hash_graceful_reverse_destroy (ht=0x7fbc91c50480) at /workspace/source/external/build/php-5.4.16-apache/Zend/zend_hash.c:687 #12 0x00007fbc9139e01e in zend_destroy_modules () at /workspace/source/external/build/php-5.4.16-apache/Zend/zend_API.c:1832 #13 0x00007fbc91394fb2 in zend_shutdown () at /workspace/source/external/build/php-5.4.16-apache/Zend/zend.c:820 #14 0x00007fbc91302145 in php_module_shutdown () at /workspace/source/external/build/php-5.4.16-apache/main/main.c:2367 #15 0x00007fbc91302111 in php_module_shutdown_wrapper (sapi_globals=0x7fbc91c2c680) at /workspace/source/external/build/php-5.4.16- apache/main/main.c:2335 #16 0x00007fbc91440916 in php_apache_child_shutdown (tmp=0x0) at /workspace/source/external/build/php-5.4.16- apache/sapi/apache2handler/sapi_apache2.c:398 #17 0x00007fbc91c6ff2e in run_cleanups (pool=0x2310c08) at memory/unix/apr_pools.c:2352 #18 apr_pool_destroy (pool=0x2310c08) at memory/unix/apr_pools.c:814 #19 0x00000000004b8d0e in clean_child_exit (code=0) at prefork.c:196 #20 0x00000000004b9129 in child_main (child_num_arg=<value optimized out>) at prefork.c:692 #21 0x00000000004b9374 in make_child (s=0x1bf0c80, slot=12) at prefork.c:768 #22 0x00000000004b9fc7 in perform_idle_server_maintenance (_pconf=<value optimized out>, plog=<value optimized out>, s=<value optimized out>) at prefork.c:903 #23 ap_mpm_run (_pconf=<value optimized out>, plog=<value optimized out>, s= <value optimized out>) at prefork.c:1107 #24 0x000000000042e564 in main (argc=3, argv=0x7fff92dd5198) at main.c:753 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=65200&edit=1
