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[2020-12-03 14:33 UTC] felix dot brucker at pickware dot de
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 ``` PatchesPull RequestsHistoryAllCommentsChangesGit/SVN commits
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Using a core dump and lldb i was able to generate a backtrace and output for the first frames: ``` (lldb) bt * thread #1, stop reason = signal SIGSTOP * frame #0: 0x000000011c3594c5 frame #1: 0x0000000105a8f4c9 php`zend_execute(op_array=0x0000000106e5f500, return_value=0x0000000000000000) at zend_vm_execute.h:58856:2 frame #2: 0x0000000105a5968d php`zend_execute_scripts(type=8, retval=0x0000000000000000, file_count=3) at zend.c:1680:4 frame #3: 0x00000001059a18a2 php`php_execute_script(primary_file=0x00007ffeea7c9088) at main.c:2488:13 frame #4: 0x0000000105b8bbfa php`do_cli(argc=2, argv=0x00007ffeea7c9728) at php_cli.c:949:5 frame #5: 0x0000000105b8ad3c php`main(argc=2, argv=0x00007ffeea7c9728) at php_cli.c:1336:18 frame #6: 0x00007fff20344631 libdyld.dylib`start + 1 frame #7: 0x00007fff20344631 libdyld.dylib`start + 1 (lldb) frame select 0 frame #0: 0x000000011c3594c5 -> 0x11c3594c5: vaddsd (%rax), %xmm0, %xmm0 0x11c3594c9: vmovsd %xmm0, (%rax) 0x11c3594ce: jmp 0x11c34e5ef 0x11c3594d3: movq %rax, %rdi (lldb) frame select 1 frame #1: 0x0000000105a8f4c9 php`zend_execute(op_array=0x0000000106e5f500, return_value=0x0000000000000000) at zend_vm_execute.h:58856:2 58853 EX(prev_execute_data) = EG(current_execute_data); 58854 i_init_code_execute_data(execute_data, op_array, return_value); 58855 ZEND_OBSERVER_FCALL_BEGIN(execute_data); -> 58856 zend_execute_ex(execute_data); 58857 /* Observer end handlers are called from ZEND_RETURN */ 58858 zend_vm_stack_free_call_frame(execute_data); 58859 } (lldb) frame select 2 frame #2: 0x0000000105a5968d php`zend_execute_scripts(type=8, retval=0x0000000000000000, file_count=3) at zend.c:1680:4 1677 } 1678 zend_destroy_file_handle(file_handle); 1679 if (op_array) { -> 1680 zend_execute(op_array, retval); 1681 zend_exception_restore(); 1682 if (UNEXPECTED(EG(exception))) { 1683 if (Z_TYPE(EG(user_exception_handler)) != IS_UNDEF) { (lldb) ```