Bug #78280 [Asn]: _emalloc causes segfaults

Edit report at https://bugs.php.net/bug.php?id=78280&edit=1 ID: 78280 User updated by: grzegorz129 at gmail dot com Reported by: grzegorz129 at gmail dot com Summary: _emalloc causes segfaults Status: Assigned Type: Bug Package: Reproducible crash Operating System: Linux PHP Version: 7.3.7 Assigned To: krakjoe Block user comment: N Private report: N New Comment: And another valgrind output: https://pastebin.com/KVBjEeq5 Previous Comments: ------------------------------------------------------------------------ [2019-07-12 17:45:26] grzegorz129 at gmail dot com As expected it crashed. The valgrind output still has a lot of "??"s but I'm not sure if that's expected: https://pastebin.com/ygvC5aws ------------------------------------------------------------------------ [2019-07-12 17:13:39] grzegorz129 at gmail dot com Re-running with the options provided. After disabling opcache the result is the same. In fact I've got one crash after just seconds of running which is very short: https://pastebin.com/zxefix13 Another one took longer but crashed again: https://pastebin.com/hsC6nqGn So I think opcache is not a factor here. To be precise about parallel it's not a parallelized on php level, but rather run with GNU Parallel. ------------------------------------------------------------------------ [2019-07-12 17:01:06] nikic@php.net Assigning to Joe as it seems likely that this is related to parallel. The valgrind log is cut off due to too many spurious zend_string_equal_val errors. Could you please rerun with the suppressions file at https://gist.github.com/nikic/8d404c6799a1532b0c10280f5e57a888 and USE_ZEND_ALLOC=0 ZEND_DONT_UNLOAD_MODULES=1 valgrind --suppressions=php73.supp php script.php ------------------------------------------------------------------------ [2019-07-12 16:51:39] grzegorz129 at gmail dot com I asked around and the error is not a regress from a recent release. The code is pretty new so the last logged crash was on 7.3.3, it also happens on 7.3.6 from Ubuntu PPA. ------------------------------------------------------------------------ [2019-07-12 16:48:15] grzegorz129 at gmail dot com The code runs in CLI only via parallel. There's usually 5-8 copies running over different files and always one of them crashes withing 10-15 minutes. I checked the cli and it looks like opcache is enabled. I will try to disable it since it serves no purpose in CLI (correct me if I'm wrong). I'm not sure if environment variable populated properly but after longer than usual run I've got such a valgrind dump: https://pastebin.com/FA4vVxzz ------------------------------------------------------------------------ The remainder of the comments for this report are too long. To view the rest of the comments, please view the bug report online at https://bugs.php.net/bug.php?id=78280 -- Edit this bug report at https://bugs.php.net/bug.php?id=78280&edit=1