Bug #72179 [NEW]: Segfault in gc_possible_root on CLI

From: webmaster at tom-geiger dot de Operating system: Ubuntu 16.04 PHP version: 7.0.6 Package: Reproducible crash Bug Type: Bug Bug description:Segfault in gc_possible_root on CLI Description: ------------ PHP CLI segfaults during a loop handling events from a database. At some point the GC segfaults the script. Adding gc_disable() at the start of the script will let it run through without error. gdb bt attached. See filed Ubuntu Bug: https://bugs.launchpad.net/bugs/1559693 "Segmentation fault (core dumped) while running an CLI "daemon" script that does a multitude of database operations onto a mysql database. (mysqli) Happens randomly, and not always at the same position of test data after processing multiple thousand different SQL queries (Select, insert, update, delete). Restarting the script after crash will successfully complete all test data. Test data sadly can't be published because of privacy concerns." StacktraceTop: gc_possible_root (ref=0x7f1599693620) at /build/php7.0-XlnpcA/php7.0-7.0.4/Zend/zend_gc.c:262 zend_assign_to_variable (value_type=16 '\020', value=0x7f15996f4980, variable_ptr=0x7f15afc15b30) at /build/php7.0-XlnpcA/php7.0-7.0.4/Zend/zend_execute.h:109 ZEND_FE_FETCH_R_SPEC_VAR_HANDLER () at /build/php7.0-XlnpcA/php7.0-7.0.4/Zend/zend_vm_execute.h:15938 execute_ex (ex=ex@entry=0x7f15afc15ab0) at /build/php7.0-XlnpcA/php7.0-7.0.4/Zend/zend_vm_execute.h:414 dtrace_execute_ex (execute_data=0x7f15afc15ab0) at /build/php7.0-XlnpcA/php7.0-7.0.4/Zend/zend_dtrace.c:83 Expected result: ---------------- No segfault. Actual result: -------------- 0x000055c1fb3dcabf in execute_ex () (gdb) cont Continuing. Program received signal SIGSEGV, Segmentation fault. 0x000055c1fb3c54bf in gc_possible_root () (gdb) bt #0 0x000055c1fb3c54bf in gc_possible_root () #1 0x000055c1fb3e3870 in ?? () #2 0x000055c1fb3dcacb in execute_ex () #3 0x000055c1fb38c511 in dtrace_execute_ex () #4 0x00007fe1ceb434ef in xdebug_execute_ex (execute_data=0x7fe1cf4168c0) at /build/xdebug-QTCpEl/xdebug-2.4.0/build-7.0/xdebug.c:1890 #5 0x000055c1fb4215ad in ?? () #6 0x000055c1fb3dcacb in execute_ex () #7 0x000055c1fb38c511 in dtrace_execute_ex () #8 0x00007fe1ceb434ef in xdebug_execute_ex (execute_data=0x7fe1cf416580) at /build/xdebug-QTCpEl/xdebug-2.4.0/build-7.0/xdebug.c:1890 #9 0x000055c1fb4215ad in ?? () #10 0x000055c1fb3dcacb in execute_ex () #11 0x000055c1fb38c511 in dtrace_execute_ex () #12 0x00007fe1ceb434ef in xdebug_execute_ex (execute_data=0x7fe1cf4164c0) at /build/xdebug-QTCpEl/xdebug-2.4.0/build-7.0/xdebug.c:1890 #13 0x000055c1fb4215ad in ?? () #14 0x000055c1fb3dcacb in execute_ex () #15 0x000055c1fb38c511 in dtrace_execute_ex () #16 0x00007fe1ceb434ef in xdebug_execute_ex (execute_data=0x7fe1cf4163f0) at /build/xdebug-QTCpEl/xdebug-2.4.0/build-7.0/xdebug.c:1890 #17 0x000055c1fb4215ad in ?? () #18 0x000055c1fb3dcacb in execute_ex () #19 0x000055c1fb38c511 in dtrace_execute_ex () #20 0x00007fe1ceb434ef in xdebug_execute_ex (execute_data=0x7fe1cf415db0) at /build/xdebug-QTCpEl/xdebug-2.4.0/build-7.0/xdebug.c:1890 #21 0x000055c1fb4215ad in ?? () #22 0x000055c1fb3dcacb in execute_ex () #23 0x000055c1fb38c511 in dtrace_execute_ex () #24 0x00007fe1ceb434ef in xdebug_execute_ex (execute_data=0x7fe1cf415b60) at /build/xdebug-QTCpEl/xdebug-2.4.0/build-7.0/xdebug.c:1890 #25 0x000055c1fb4215ad in ?? () #26 0x000055c1fb3dcacb in execute_ex () #27 0x000055c1fb38c511 in dtrace_execute_ex () #28 0x00007fe1ceb434ef in xdebug_execute_ex (execute_data=0x7fe1cf415280) at /build/xdebug-QTCpEl/xdebug-2.4.0/build-7.0/xdebug.c:1890 #29 0x000055c1fb4215ad in ?? () #30 0x000055c1fb3dcacb in execute_ex () #31 0x000055c1fb38c511 in dtrace_execute_ex () #32 0x00007fe1ceb434ef in xdebug_execute_ex (execute_data=0x7fe1cf414ae0) at /build/xdebug-QTCpEl/xdebug-2.4.0/build-7.0/xdebug.c:1890 #33 0x000055c1fb4215ad in ?? () #34 0x000055c1fb3dcacb in execute_ex () #35 0x000055c1fb38c511 in dtrace_execute_ex () #36 0x00007fe1ceb434ef in xdebug_execute_ex (execute_data=0x7fe1cf4149b0) at /build/xdebug-QTCpEl/xdebug-2.4.0/build-7.0/xdebug.c:1890 #37 0x000055c1fb4215ad in ?? () #38 0x000055c1fb3dcacb in execute_ex () #39 0x000055c1fb38c511 in dtrace_execute_ex () #40 0x00007fe1ceb434ef in xdebug_execute_ex (execute_data=0x7fe1cf414650) at /build/xdebug-QTCpEl/xdebug-2.4.0/build-7.0/xdebug.c:1890 #41 0x000055c1fb4215ad in ?? () #42 0x000055c1fb3dcacb in execute_ex () #43 0x000055c1fb38c511 in dtrace_execute_ex () #44 0x00007fe1ceb434ef in xdebug_execute_ex (execute_data=0x7fe1cf4144d0) at /build/xdebug-QTCpEl/xdebug-2.4.0/build-7.0/xdebug.c:1890 #45 0x000055c1fb4215ad in ?? () #46 0x000055c1fb3dcacb in execute_ex () #47 0x000055c1fb38c511 in dtrace_execute_ex () #48 0x00007fe1ceb434ef in xdebug_execute_ex (execute_data=0x7fe1cf414030) at /build/xdebug-QTCpEl/xdebug-2.4.0/build-7.0/xdebug.c:1890 #49 0x000055c1fb430537 in zend_execute () ---Type <return> to continue, or q <return> to quit---bt #50 0x000055c1fb39c713 in zend_execute_scripts () #51 0x000055c1fb33d130 in php_execute_script () #52 0x000055c1fb4321f7 in ?? () #53 0x000055c1fb221f64 in main () -- Edit bug report at https://bugs.php.net/bug.php?id=72179&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=72179&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=72179&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=72179&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=72179&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=72179&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=72179&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=72179&r=needscript Try newer version: https://bugs.php.net/fix.php?id=72179&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=72179&r=support Expected behavior: https://bugs.php.net/fix.php?id=72179&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=72179&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=72179&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=72179&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=72179&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=72179&r=dst IIS Stability: https://bugs.php.net/fix.php?id=72179&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=72179&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=72179&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=72179&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=72179&r=mysqlcfg