Bug #80480 [NEW]: Segmentation fault with opcache enabled

From: felix dot brucker at pickware dot de Operating system: Mac OS 11.0.1 PHP version: 8.0.0 Package: opcache Bug Type: Bug Bug description:Segmentation fault with opcache enabled Description: ------------ The test script produces a segmentation fault with PHP 8.0.0 and opcache enabled on Mac OS (tested with 11.0.1). On Ubuntu 20.04 with PHP 8.0.0 and opcache enabled the script does not produce a segmentation fault. The segmentation fault happens on both CLI and when using php with apache2. Initially i used the PHP 8 install via https://github.com/shivammathur/homebrew-php and to try to get the backtrace i built PHP locally via ``` PATH="/usr/local/opt/bison/bin:/usr/local/opt/re2c/bin:$PATH" ./configure --enable-debug --with-os-sdkpath=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk --enable-bcmath --enable-calendar --enable-dba --enable-dtrace --enable-exif --enable-ftp --enable-gd --enable-mbregex --enable-mbstring --enable-mysqlnd --enable-pcntl --enable-phpdbg --enable-phpdbg-readline --enable-phpdbg-webhelper --enable-shmop --enable-soap --enable-sockets --enable-sysvmsg --enable-sysvsem --enable-sysvshm --with-bz2=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr --with-curl --with-external-gd --with-external-pcre --with-ffi --with-gettext=/usr/local/opt/gettext --with-gmp=/usr/local/opt/gmp --with-iconv=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr --with-layout=GNU --with-libxml --with-libedit --with-mhash=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr --with-pic --with-sodium --with-xsl --with-zip --with-zlib --with-pspell=/usr/local/opt/aspell --sysconfdir=/usr/local/etc/php/8.0 --with-config-file-path=/usr/local/etc/php/8.0 --with-config-file-scan-dir=/usr/local/etc/php/8.0/conf.d --enable-opcache PATH="/usr/local/opt/bison/bin:/usr/local/opt/re2c/bin:$PATH" make -j 8 ``` The resulting binary reports: ``` ./sapi/cli/php -v PHP 8.0.0-dev (cli) (built: Dec 3 2020 14:40:00) ( NTS DEBUG ) Copyright (c) The PHP Group Zend Engine v4.0.0-dev, Copyright (c) Zend Technologies with Zend OPcache v8.0.0-dev, Copyright (c), by Zend Technologies ./sapi/cli/php -m [PHP Modules] bcmath bz2 calendar Core ctype curl date dba dom exif FFI fileinfo filter ftp gd gettext gmp hash iconv json libxml mbstring mysqlnd pcntl pcre PDO pdo_sqlite Phar phpdbg_webhelper posix pspell readline Reflection session shmop SimpleXML soap sockets sodium SPL sqlite3 standard sysvmsg sysvsem sysvshm tokenizer xml xmlreader xmlwriter xsl Zend OPcache zip zlib [Zend Modules] Zend OPcache ``` Using gdb to run the php test script results in no error being thrown, it just hangs: ``` sudo gdb ./sapi/cli/php Password: GNU gdb (GDB) 10.1 Copyright (C) 2020 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. Type "show copying" and "show warranty" for details. This GDB was configured as "x86_64-apple-darwin20.1.0". Type "show configuration" for configuration details. For bug reporting instructions, please see: <https://www.gnu.org/software/gdb/bugs/>. Find the GDB manual and other documentation resources online at: <http://www.gnu.org/software/gdb/documentation/>. For help, type "help". Type "apropos word" to search for commands related to "word"... Reading symbols from ./sapi/cli/php... (gdb) run test_script.php Starting program: /Users/felixbrucker/php-src/sapi/cli/php test_script.php [New Thread 0x2403 of process 86826] ``` At this point i can only kill the process via kill. So far i also tried to reduce the optimizations of opcache to zero like so: opcache.optimization_level=0, but the segmentation fault persists. Test script: --------------- https://gist.github.com/felixbrucker/f8f4623f69b16fc873dbf654db699208 ``` php test_script.php ``` Expected result: ---------------- No segmentation fault Actual result: -------------- ``` ./sapi/cli/php test_script.php [1] 87335 segmentation fault ./sapi/cli/php test_script.php ``` -- Edit bug report at https://bugs.php.net/bug.php?id=80480&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=80480&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=80480&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=80480&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=80480&r=needscript Try newer version: https://bugs.php.net/fix.php?id=80480&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=80480&r=support Expected behavior: https://bugs.php.net/fix.php?id=80480&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=80480&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=80480&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=80480&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=80480&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=80480&r=dst IIS Stability: https://bugs.php.net/fix.php?id=80480&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=80480&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=80480&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=80480&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=80480&r=mysqlcfg