Bug #78476 [Ver]: Segfault when running Monolog test suite on 7.4snapshot

Edit report at https://bugs.php.net/bug.php?id=78476&edit=1 ID: 78476 Updated by: seld@php.net Reported by: seld@php.net Summary: Segfault when running Monolog test suite on 7.4snapshot Status: Verified Type: Bug Package: Reproducible crash Operating System: Linux PHP Version: 7.4Git-2019-08-30 (snap) Block user comment: N Private report: N New Comment: Ok thanks for the find. I fixed it in https://github.com/Seldaek/monolog/commit/0f39561898a66334fe5f2a6768eb8043d2f34cd5 which fixes the build. It seems to pass without notice either so I am not sure how this is possible. If opcache caused the notice which then crashed with the segfault the notice should still be there. If opcache had only an issue with the error handler then it should show a notice now? Previous Comments: ------------------------------------------------------------------------ [2019-09-02 08:10:51] nikic@php.net @seld: The problematic error handler is set up here: https://github.com/Seldaek/monolog/blob/21b1705c3e6a6312687a275870e3e539af0a3896/tests/Monolog/ErrorHandlerTest.php#L40-L42 So while there is presumably also an opcache bug here that causes the notice in the first place, this code should probably also be fixed to make sure that any notice thrown in the testsuite does not automatically turn into a stack overflow segfault. ------------------------------------------------------------------------ [2019-09-02 07:57:29] nikic@php.net Heh, this is a stack overflow caused by infinite recursion in the error handler for a "Trying to access array offset on value of type null" notice. The original notice is triggered in https://github.com/Seldaek/monolog/blob/21b1705c3e6a6312687a275870e3e539af0a3896/src/Monolog/Handler/ElasticsearchHandler.php#L150 and the infinite recursion occurs in https://github.com/Seldaek/monolog/blob/21b1705c3e6a6312687a275870e3e539af0a3896/src/Monolog/ErrorHandler.php#L201. Not sure where the opcache-specific bit in this is. ------------------------------------------------------------------------ [2019-09-01 13:28:23] nikic@php.net Can reproduce with opcache ... didn't know that's enabled on Travis. ------------------------------------------------------------------------ [2019-08-30 13:57:59] nikic@php.net Can't reproduce with current 7.4 HEAD. ------------------------------------------------------------------------ [2019-08-30 13:50:15] seld@php.net Description: ------------ See Travis job output. That's all the info I have sorry no time to dig further at the moment. https://travis-ci.org/Seldaek/monolog/jobs/578742282 Test script: --------------- composer create-project monolog/monolog cd monolog vendor/bin/phpunit Expected result: ---------------- No segfault :) Actual result: -------------- Segfault :( ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=78476&edit=1