Bug #70111 [Csd]: Segfault when a function uses both an explicit return type and an explicit cast

Edit report at https://bugs.php.net/bug.php?id=70111&edit=1 ID: 70111 User updated by: malte dot skoruppa at gmail dot com Reported by: malte dot skoruppa at gmail dot com Summary: Segfault when a function uses both an explicit return type and an explicit cast Status: Closed Type: Bug Package: Reproducible crash Operating System: Ubuntu 14.04 LTS PHP Version: 7.0Git-2015-07-22 (Git) Assigned To: laruence Block user comment: N Private report: N New Comment: Great! That was incredibly fast. :) Please note that the bug did not happen everytime (especially the first 1-2 times when executing the script), so the test case you added might randomly pass even if the bug reappears. Is there a facility to run the regresstion test more than once? Previous Comments: ------------------------------------------------------------------------ [2015-07-22 14:48:33] laruence@php.net Automatic comment on behalf of laruence Revision: http://git.php.net/?p=php-src.git;a=commit;h=3e479ef424b2193f41a28fda18bde076a79ea71e Log: Fixed bug #70111 (Segfault when a function uses both an explicit return type and an explicit cast) ------------------------------------------------------------------------ [2015-07-22 11:30:21] laruence@php.net this is an opcache issue... ------------------------------------------------------------------------ [2015-07-22 10:31:27] malte dot skoruppa at gmail dot com Description: ------------ When a function both * specifies an explicit return type * AND uses an explicit cast of the return value, then the PHP interpreter segfaults non-deterministically with high probability. To reproduce, execute the following script with the PHP interpreter several times in a row. Sometimes it works, sometimes it segfaults. Test script: --------------- <?php foo(); function foo() : string { return (string) 42; } Expected result: ---------------- PHP interpreter should not crash, no matter how many times the script is run. Actual result: -------------- The PHP interpreter segfaults when running this script. Not always, but very often: $ php crash.php Segmentation fault (core dumped) gdb backtrace: Core was generated by `php crash.php'. Program terminated with signal SIGSEGV, Segmentation fault. #0 0x0000000000000000 in ?? () (gdb) bt #0 0x0000000000000000 in ?? () #1 0x0000000000888c20 in execute_ex (ex=0x7fa8daa14030) at /home/malte/php7/php-src/Zend/zend_vm_execute.h:406 #2 0x0000000000888d32 in zend_execute (op_array=0x7fa8daa75100, return_value=0x0) at /home/malte/php7/php-src/Zend/zend_vm_execute.h:450 #3 0x000000000082ee86 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /home/malte/php7/php-src/Zend/zend.c:1399 #4 0x000000000079aefc in php_execute_script (primary_file=0x7ffdb976c850) at /home/malte/php7/php-src/main/main.c:2475 #5 0x00000000008ec6ac in do_cli (argc=2, argv=0x2f6b0e0) at /home/malte/php7/php-src/sapi/cli/php_cli.c:971 #6 0x00000000008ed870 in main (argc=2, argv=0x2f6b0e0) at /home/malte/php7/php-src/sapi/cli/php_cli.c:1338 ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=70111&edit=1