Bug #77751 [Opn->Fbk]: Writing to SplFileObject in ob_start gives segfault

Edit report at https://bugs.php.net/bug.php?id=77751&edit=1 ID: 77751 Updated by: requinix@php.net Reported by: michael dot mauch at gmx dot de Summary: Writing to SplFileObject in ob_start gives segfault -Status: Open +Status: Feedback Type: Bug Package: Output Control Operating System: Ubuntu 16.04 PHP Version: 7.3.3 Block user comment: N Private report: N New Comment: Thank you for this bug report. To properly diagnose the problem, we need a backtrace to see what is happening behind the scenes. To find out how to generate a backtrace, please read http://bugs.php.net/bugs-generating-backtrace.php for *NIX and http://bugs.php.net/bugs-generating-backtrace-win32.php for Win32 Once you have generated a backtrace, please submit it to this bug report and change the status back to "Open". Thank you for helping us make PHP better. Previous Comments: ------------------------------------------------------------------------ [2019-03-15 19:08:23] michael dot mauch at gmx dot de Description: ------------ I'm using a function like below to redirect all output to a log file in PHP CLI scripts. It works until PHP 7.1, but crashes with SIGSEGV in 7.2 and 7.3. If I use old fopen() instead of SplFileObject, it also works with 7.2 and 7.3. Oracle Linux 7.x at work, Ubuntu 16.04 at home, or even in docker with the official images. Test script: --------------- <?php $logfilename = "/tmp/crash.log"; $logfile = new SplFileObject($logfilename, "w"); ob_start(function ($buffer) use ($logfile) { $logfile->fwrite($buffer); $logfile->fflush(); return ""; }); echo "hmm\n"; Expected result: ---------------- # Like with PHP 7.1: % docker run -it --rm -v "$PWD":/tmp -w /tmp php:7.1-cli /bin/bash -c 'ulimit -c unlimited; php -v; php ./crash.php && echo ok' PHP 7.1.27 (cli) (built: Mar 9 2019 02:51:22) ( NTS ) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.1.0, Copyright (c) 1998-2018 Zend Technologies ok Actual result: -------------- # But with PHP 7.3: % docker run -it --rm -v "$PWD":/tmp -w /tmp php:cli /bin/bash -c 'ulimit -c unlimited; php -v; php ./crash.php && echo ok' PHP 7.3.3 (cli) (built: Mar 9 2019 00:27:53) ( NTS ) Copyright (c) 1997-2018 The PHP Group Zend Engine v3.3.3, Copyright (c) 1998-2018 Zend Technologies /bin/bash: line 1: 7 Segmentation fault (core dumped) php ./crash.php ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=77751&edit=1