Bug #72147 [NEW]: Segmentation fault in /lib/x86_64-linux-gnu/libpcre.so.3 called by php_free_pcr

From: tom60 at op dot pl Operating system: Debian Jessie 64 bit PHP version: 7.0.6 Package: Reproducible crash Bug Type: Bug Bug description:Segmentation fault in /lib/x86_64-linux-gnu/libpcre.so.3 called by php_free_pcr Description: ------------ PHP 7.0.6 compiled with libpcre3:amd64 2:8.35-3.3+deb8u4 on Debian Jessie crashes from time to time. For us it occurs mostly when we deploy new PHP code to a webserver. During the deploy we call opcache_reset(). PHP 5.6.21 on the same server with the same libraries is rock-solid. That's why I think it might be the issue with the way PHP 7 uses the PCRE library. I've attached a backtrace from GDB. Please let me know if I should supply any more details. Actual result: -------------- Reading symbols from /opt/apache2/sbin/apache2...done. [New LWP 22823] [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1". Core was generated by `/opt/apache2/sbin/apache2 -k start'. Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007f62bd412ae5 in ?? () from /lib/x86_64-linux-gnu/libpcre.so.3 (gdb) bt #0 0x00007f62bd412ae5 in ?? () from /lib/x86_64-linux-gnu/libpcre.so.3 #1 0x00007f62bd438508 in ?? () from /lib/x86_64-linux-gnu/libpcre.so.3 #2 0x00007f62bd43a13c in pcre_free_study () from /lib/x86_64-linux-gnu/libpcre.so.3 #3 0x00007f62bb2a4863 in php_free_pcre_cache (data=<optimized out>) at /src/php-7.0.6/ext/pcre/php_pcre.c:113 #4 0x00007f62bb5e6534 in zend_hash_destroy (ht=0x7f62bbf3b940 <pcre_globals>) at /src/php-7.0.6/Zend/zend_hash.c:1284 #5 0x00007f62bb2a47e9 in zm_globals_dtor_pcre (pcre_globals=<optimized out>) at /src/php-7.0.6/ext/pcre/php_pcre.c:136 #6 0x00007f62bb5dc579 in module_destructor (module=module@entry=0x7f62bf28c3e0) at /src/php-7.0.6/Zend/zend_API.c:2516 #7 0x00007f62bb5d501c in module_destructor_zval (zv=<optimized out>) at /src/php-7.0.6/Zend/zend.c:615 #8 0x00007f62bb5e7049 in _zend_hash_del_el_ex (prev=<optimized out>, p=<optimized out>, idx=<optimized out>, ht=<optimized out>) at /src/php-7.0.6/Zend/zend_hash.c:1026 #9 _zend_hash_del_el (p=0x7f62bf2a4780, idx=4, ht=0x7f62bbf42840 <module_registry>) at /src/php-7.0.6/Zend/zend_hash.c:1050 #10 zend_hash_graceful_reverse_destroy (ht=ht@entry=0x7f62bbf42840 <module_registry>) at /src/php-7.0.6/Zend/zend_hash.c:1502 #11 0x00007f62bb5daa3c in zend_destroy_modules () at /src/php-7.0.6/Zend/zend_API.c:1984 #12 0x00007f62bb5d5fd5 in zend_shutdown () at /src/php-7.0.6/Zend/zend.c:840 #13 0x00007f62bb57a35b in php_module_shutdown () at /src/php-7.0.6/main/main.c:2362 #14 0x00007f62bb57a419 in php_module_shutdown_wrapper (sapi_globals=<optimized out>) at /src/php-7.0.6/main/main.c:2330 #15 0x00007f62bb667861 in php_apache_child_shutdown (tmp=<optimized out>) at /src/php-7.0.6/sapi/apache2handler/sapi_apache2.c:399 #16 0x00007f62bcb6bfae in run_cleanups (cref=<optimized out>) at memory/unix/apr_pools.c:2352 #17 apr_pool_destroy (pool=0x7f62bf3df8d8) at memory/unix/apr_pools.c:814 #18 0x00007f62bdfa37be in clean_child_exit (code=0) at prefork.c:227 #19 0x00007f62bdfa3ca8 in child_main (child_num_arg=-1110591680, child_bucket=1189753504) at prefork.c:744 #20 0x00007f62bdfa4050 in make_child (s=0x7f62bf1349a8, slot=45, bucket=0) at prefork.c:824 #21 0x00007f62bdfa4ea5 in perform_idle_server_maintenance (p=<optimized out>) at prefork.c:932 #22 prefork_run (_pconf=0x7f62bdcdb740, plog=0x7ffc46ea3390, s=0x7ffc46ea3350) at prefork.c:1128 #23 0x00007f62bdf2489e in ap_run_mpm (pconf=0x7f62bf101138, plog=0x7f62bf13a818, s=0x7f62bf1349a8) at mpm_common.c:94 #24 0x00007f62bdf1de15 in main (argc=3, argv=0x7ffc46ea3628) at main.c:778 -- Edit bug report at https://bugs.php.net/bug.php?id=72147&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=72147&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=72147&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=72147&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=72147&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=72147&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=72147&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=72147&r=needscript Try newer version: https://bugs.php.net/fix.php?id=72147&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=72147&r=support Expected behavior: https://bugs.php.net/fix.php?id=72147&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=72147&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=72147&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=72147&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=72147&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=72147&r=dst IIS Stability: https://bugs.php.net/fix.php?id=72147&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=72147&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=72147&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=72147&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=72147&r=mysqlcfg