Bug #70007 [NEW]: Segmentation fault in gc_remove_zval_from_buffer

From: pdecat at gmail dot com Operating system: Debian GNU/Linux 7.8 PHP version: 5.6.10 Package: Reproducible crash Bug Type: Bug Bug description:Segmentation fault in gc_remove_zval_from_buffer Description: ------------ Under heavy load, we eventually get a SIGSEGV on a single PHP script. Other scripts continue to work. The same script will always segfault until the php5-fpm service is restarted. This is with php5 packages version 5.6.10-1~dotdeb+7.3 from http://packages.dotdeb.org/dists/wheezy-php56/php5/binary-amd64/ Looks similar to https://bugs.php.net/bug.php?id=67314 Test script: --------------- <?php // Here is a suspicious code snippet that results to segfaults under heavy load final class Test { const IDS = [ 1, 2, 3, 4, ]; public static function is($id) { return in_array($id, self::IDS); } } for($i = 0; $i <= 1000000; $i++) { Test::is($i%10); } Expected result: ---------------- Never segfault. Possible workaround: @@ -1,7 +1,7 @@ <?php final class Test { - const IDS = [ + public static $IDS = [ 1, 2, 3, @@ -9,7 +9,7 @@ final class Test { ]; public static function is($id) { - return in_array($id, self::IDS); + return in_array($id, self::$IDS); } } Actual result: -------------- [05-Jul-2015 19:05:16] NOTICE: fpm is running, pid 12824 [05-Jul-2015 19:05:16] NOTICE: ready to handle connections [06-Jul-2015 09:23:35] WARNING: [pool mypool] child 18436 exited on signal 11 (SIGSEGV - core dumped) after 5408.796888 seconds from start [06-Jul-2015 09:23:35] NOTICE: [pool mypool] child 19100 started [06-Jul-2015 09:23:35] WARNING: [pool mypool] child 19031 exited on signal 11 (SIGSEGV - core dumped) after 523.790290 seconds from start [06-Jul-2015 09:23:35] NOTICE: [pool mypool] child 19101 started [06-Jul-2015 09:23:35] WARNING: [pool mypool] child 17563 exited on signal 11 (SIGSEGV - core dumped) after 11632.329569 seconds from start [06-Jul-2015 09:23:35] NOTICE: [pool mypool] child 19103 started [06-Jul-2015 09:23:35] NOTICE: Finishing ... [06-Jul-2015 09:24:05] NOTICE: Terminating ... [06-Jul-2015 09:24:07] NOTICE: exiting, bye-bye! [06-Jul-2015 09:24:07] NOTICE: fpm is running, pid 19129 Here is the backtrace: (gdb) bt #0 gc_remove_from_buffer (root=0x4) at /usr/src/builddir/Zend/zend_gc.h:189 #1 gc_remove_zval_from_buffer (zv=zv@entry=0x7f405dedb490) at /usr/src/builddir/Zend/zend_gc.c:260 #2 0x00000000007306b8 in i_zval_ptr_dtor (zval_ptr=0x7f405dedb490) at /usr/src/builddir/Zend/zend_execute.h:78 #3 _zval_ptr_dtor (zval_ptr=<optimized out>) at /usr/src/builddir/Zend/zend_execute_API.c:424 #4 0x000000000074f578 in zend_hash_destroy (ht=0x3bdf738) at /usr/src/builddir/Zend/zend_hash.c:548 #5 0x0000000000740393 in _zval_dtor_func (zvalue=0x3ed5458) at /usr/src/builddir/Zend/zend_variables.c:45 #6 0x00000000007e56f0 in _zval_dtor (zvalue=0x3ed5458) at /usr/src/builddir/Zend/zend_variables.h:35 #7 i_zval_ptr_dtor (zval_ptr=0x3ed5458) at /usr/src/builddir/Zend/zend_execute.h:79 #8 zend_vm_stack_clear_multiple (nested=0) at /usr/src/builddir/Zend/zend_execute.h:308 #9 zend_do_fcall_common_helper_SPEC (execute_data=0x7f40978a44b0) at /usr/src/builddir/Zend/zend_vm_execute.h:650 #10 0x00000000007aa848 in execute_ex (execute_data=0x7f40978a44b0) at /usr/src/builddir/Zend/zend_vm_execute.h:363 #11 0x00000000007303cd in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/builddir/Zend/zend_dtrace.c:73 #12 0x00007f408c2653bd in nr_php_execute_enabled () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:1051 #13 0x00007f408c265b52 in nr_php_execute () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:1162 #14 0x00000000007e5d08 in zend_do_fcall_common_helper_SPEC (execute_data=0x7f40978a4388) at /usr/src/builddir/Zend/zend_vm_execute.h:592 #15 0x00000000007aa848 in execute_ex (execute_data=0x7f40978a4388) at /usr/src/builddir/Zend/zend_vm_execute.h:363 #16 0x00000000007303cd in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/builddir/Zend/zend_dtrace.c:73 #17 0x00007f408c2653bd in nr_php_execute_enabled () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:1051 #18 0x00007f408c265b52 in nr_php_execute () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:1162 #19 0x0000000000732106 in zend_call_function (fci=fci@entry=0x7fff5732c490, fci_cache=0x33c6c60, fci_cache@entry=0x7fff5732c460) at /usr/src/builddir/Zend/zend_execute_API.c:829 #20 0x000000000066022f in zif_call_user_func_array (ht=<optimized out>, return_value=0x3ed4f78, return_value_ptr=<optimized out>, this_ptr=<optimized out>, return_value_used=<optimized out>) at /usr/src/builddir/ext/standard/basic_functions.c:4784 #21 0x00000000007304f9 in dtrace_execute_internal (execute_data_ptr=<optimized out>, fci=<optimized out>, return_value_used=<optimized out>) at /usr/src/builddir/Zend/zend_dtrace.c:97 #22 0x00000000007e56d1 in zend_do_fcall_common_helper_SPEC (execute_data=0x7f40978a4190) at /usr/src/builddir/Zend/zend_vm_execute.h:560 #23 0x00000000007aa848 in execute_ex (execute_data=0x7f40978a4190) at /usr/src/builddir/Zend/zend_vm_execute.h:363 #24 0x00000000007303cd in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/builddir/Zend/zend_dtrace.c:73 #25 0x00007f408c2653bd in nr_php_execute_enabled () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:1051 #26 0x00007f408c265b52 in nr_php_execute () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:1162 #27 0x00000000007e5d08 in zend_do_fcall_common_helper_SPEC (execute_data=0x7f40978a4030) at /usr/src/builddir/Zend/zend_vm_execute.h:592 #28 0x00000000007aa848 in execute_ex (execute_data=0x7f40978a4030) at /usr/src/builddir/Zend/zend_vm_execute.h:363 #29 0x00000000007303cd in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/builddir/Zend/zend_dtrace.c:73 #30 0x00007f408c2653bd in nr_php_execute_enabled () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:1051 #31 0x00007f408c265b52 in nr_php_execute () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:1162 #32 0x00000000007e5d08 in zend_do_fcall_common_helper_SPEC (execute_data=0x7f40978a3eb8) at /usr/src/builddir/Zend/zend_vm_execute.h:592 #33 0x00000000007aa848 in execute_ex (execute_data=0x7f40978a3eb8) at /usr/src/builddir/Zend/zend_vm_execute.h:363 #34 0x00000000007303cd in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/builddir/Zend/zend_dtrace.c:73 #35 0x00007f408c2653bd in nr_php_execute_enabled () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:1051 #36 0x00007f408c265b52 in nr_php_execute () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:1162 #37 0x00000000007e5d08 in zend_do_fcall_common_helper_SPEC (execute_data=0x7f40978a3d80) at /usr/src/builddir/Zend/zend_vm_execute.h:592 #38 0x00000000007aa848 in execute_ex (execute_data=0x7f40978a3d80) at /usr/src/builddir/Zend/zend_vm_execute.h:363 #39 0x00000000007303cd in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/builddir/Zend/zend_dtrace.c:73 #40 0x00007f408c2653bd in nr_php_execute_enabled () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:1051 #41 0x00007f408c265b52 in nr_php_execute () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:1162 #42 0x00000000007e5d08 in zend_do_fcall_common_helper_SPEC (execute_data=0x7f40978a3c48) at /usr/src/builddir/Zend/zend_vm_execute.h:592 #43 0x00000000007aa848 in execute_ex (execute_data=0x7f40978a3c48) at /usr/src/builddir/Zend/zend_vm_execute.h:363 #44 0x00000000007303cd in dtrace_execute_ex (execute_data=<optimized out>) at /usr/src/builddir/Zend/zend_dtrace.c:73 #45 0x00007f408c2655f2 in nr_php_execute_enabled () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:899 #46 0x00007f408c265b52 in nr_php_execute () at /home/hudson/slave-workspace/workspace/PHP_Release_Agent/label/centos5-64-nrcamp/agent/php_execute.c:1162 #47 0x0000000000742d28 in zend_execute_scripts (type=type@entry=8, retval=retval@entry=0x0, file_count=file_count@entry=3) at /usr/src/builddir/Zend/zend.c:1341 #48 0x00000000006de3c2 in php_execute_script (primary_file=primary_file@entry=0x7fff5732f510) at /usr/src/builddir/main/main.c:2597 #49 0x0000000000474b12 in main (argc=<optimized out>, argv=<optimized out>) at /usr/src/builddir/sapi/fpm/fpm/fpm_main.c:1964 -- Edit bug report at https://bugs.php.net/bug.php?id=70007&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=70007&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=70007&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=70007&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=70007&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=70007&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=70007&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=70007&r=needscript Try newer version: https://bugs.php.net/fix.php?id=70007&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=70007&r=support Expected behavior: https://bugs.php.net/fix.php?id=70007&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=70007&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=70007&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=70007&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=70007&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=70007&r=dst IIS Stability: https://bugs.php.net/fix.php?id=70007&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=70007&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=70007&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=70007&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=70007&r=mysqlcfg