Bug #79088 [NEW]: Segmentation fault when instatiating a class

From: jakub at tuenti dot com Operating system: Linux PHP version: 7.4.1 Package: opcache Bug Type: Bug Bug description:Segmentation fault when instatiating a class Description: ------------ When executing the attached script with opcache enabled, I get segmentation faults. It can be reproduced by running it with the php docker images: $ docker run -v $PWD/test.php:/test.php -ti php:7.4.1 sh -c "php -dzend_extension=opcache -dopcache.enable_cli=1 /test.php; php -dzend_extension=opcache -dopcache.enable_cli=1 /test.php" Segmentation fault (core dumped) Segmentation fault (core dumped) The script runs fine on 7.3.13, but segfaults on all the 7.4 tags I tested (7.4.0alpha1, 7.4.0 and 7.4.1). The backtrace I attach is from a custom php image (based on debian buster and using the packages from deb.sury.org). Test script: --------------- <?php class A { const B = 'c'; } class D { public function __construct() { } } class E extends D { static $A = A::B; } new E(); Actual result: -------------- (gdb) bt #0 __strlen_avx2 () at ../sysdeps/x86_64/multiarch/strlen-avx2.S:65 #1 0x000055d097fe28f5 in xbuf_format_converter (xbuf=0x7ffc2a75f2a0, is_char=1 '\001', fmt=0x55d098128a4c "s::%s() from invalid context", ap=0x7ffc2a75f2f0) at ./main/spprintf.c:596 #2 0x000055d09803f005 in zend_vspprintf (pbuf=0x7ffc2a75f2e8, max_len=0, format=<optimized out>, ap=<optimized out>) at ./Zend/zend.c:190 #3 0x000055d097e8ec81 in zend_throw_error (exception_ce=0x55d0999a1d40, format=0x55d098128a40 "Call to %s %s::%s() from invalid context") at ./Zend/zend.c:1535 #4 0x000055d097e97a29 in zend_std_get_constructor (zobj=<optimized out>) at ./Zend/zend_object_handlers.c:1588 #5 0x000055d0980a40a6 in ZEND_NEW_SPEC_CONST_UNUSED_HANDLER () at ./Zend/zend_vm_execute.h:9226 #6 0x000055d0980bed0a in execute_ex (ex=0x18) at ./Zend/zend_vm_execute.h:54334 #7 0x000055d0980c6271 in zend_execute (op_array=0x7f89566702a0, return_value=<optimized out>) at ./Zend/zend_vm_execute.h:57664 #8 0x000055d0980402c3 in zend_execute_scripts (type=type@entry=8, retval=0x7f8956614020, retval@entry=0x0, file_count=file_count@entry=3) at ./Zend/zend.c:1663 #9 0x000055d097fdfd50 in php_execute_script (primary_file=<optimized out>) at ./main/main.c:2619 #10 0x000055d0980c8316 in do_cli (argc=5, argv=0x55d099944360) at ./sapi/cli/php_cli.c:961 #11 0x000055d097ea77cf in main (argc=5, argv=0x55d099944360) at ./sapi/cli/php_cli.c:1352 (gdb) dump_bt executor_globals.current_execute_data [0x7f8956614020] (main) /source/test.php:19 -- Edit bug report at https://bugs.php.net/bug.php?id=79088&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=79088&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=79088&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=79088&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=79088&r=needscript Try newer version: https://bugs.php.net/fix.php?id=79088&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=79088&r=support Expected behavior: https://bugs.php.net/fix.php?id=79088&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=79088&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=79088&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=79088&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=79088&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=79088&r=dst IIS Stability: https://bugs.php.net/fix.php?id=79088&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=79088&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=79088&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=79088&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=79088&r=mysqlcfg