[php-src] Issue #7877: Segfaults with PHP 7.4.27 fpm and mysqlnd driver

Issue: https://github.com/php/php-src/issues/7877 Comment Author: derickr On 3 January 2022 15:36:52 GMT, Niclas Hoyer ***@***.***> wrote: >### Description > >We started to get a lot of segfaults recently using PHP 7.4.27 FPM. Every segfault is related to >the mysqlnd extension and it seems that something goes wrong while >executing a PDO statement. > >I could provide the full backtrace if needed. I just need some secure place to upload it. > >**To Reproduce** >I tried to reproduce the error in a minimal example using similar queries, but that did not >trigger the problem. > >**Expected behavior** >A call to PDOStatement->execute should not run into a >segfault. > >**Package(s) (please complete the following information):** > >``` >php7.4-fpm: > Installed: 7.4.27-1+ubuntu20.04.1+deb.sury.org+1 > Candidate: 7.4.27-1+ubuntu20.04.1+deb.sury.org+1 > Version table: > *** 7.4.27-1+ubuntu20.04.1+deb.sury.org+1 500 > 500 http://ppa.launchpad.net/ondrej/php/ubuntu > focal/main amd64 Packages > 100 /var/lib/dpkg/status > 7.4.3-4ubuntu2.8 500 > 500 http://de.archive.ubuntu.com/ubuntu > focal-updates/universe amd64 Packages > 500 http://mirror.hetzner.de/ubuntu/packages > focal-updates/universe amd64 Packages > 7.4.3-4ubuntu2.7 500 > 500 http://security.ubuntu.com/ubuntu > focal-security/universe amd64 Packages > 500 http://mirror.hetzner.de/ubuntu/packages > focal-security/universe amd64 Packages > 7.4.3-4ubuntu1 500 > 500 http://de.archive.ubuntu.com/ubuntu focal/universe > amd64 Packages > 500 http://mirror.hetzner.de/ubuntu/packages > focal/universe amd64 Packages >``` > >**Additional context** >Backtrace using gdb: > >``` >Program terminated with signal SIGSEGV, Segmentation fault. >#0 0x00007f3157ed21bb in ?? () from /usr/lib/php/20190902/mysqlnd.so >(gdb) bt >#0 0x00007f3157ed21bb in ?? () from /usr/lib/php/20190902/mysqlnd.so >#1 0x00007f3157ed3708 in ?? () from /usr/lib/php/20190902/mysqlnd.so >#2 0x00007f3157ede815 in ?? () from /usr/lib/php/20190902/mysqlnd.so >#3 0x00007f3157edaf6d in ?? () from /usr/lib/php/20190902/mysqlnd.so >#4 0x00007f3157eddd8d in ?? () from /usr/lib/php/20190902/mysqlnd.so >#5 0x00007f3157eccaaf in ?? () from /usr/lib/php/20190902/mysqlnd.so >#6 0x00007f3154b20bc6 in ?? () from /usr/lib/php/20190902/pdo_mysql.so >#7 0x00007f3157eab191 in ?? () from /usr/lib/php/20190902/pdo.so >#8 0x000055775c2aafe5 in ZEND_DO_FCALL_SPEC_RETVAL_USED_HANDLER () at >./Zend/zend_vm_execute.h:1730 >#9 execute_ex (ex=0x7ffcfb317090) at ./Zend/zend_vm_execute.h:53525 >#10 0x000055775c213f6f in zend_call_function ***@***.***=0x7ffcfb317b80, >fci_cache=0x7f31452277c8, ***@***.***=0x7ffcfb317b60) > at ./Zend/zend_execute_API.c:820 >#11 0x000055775c23ee5c in zend_call_method (object=0x7f30e56e3430, obj_ce=<optimized out>, >fn_proxy=0x7f3142c29cd0, > function_name=0x55775c2e5bdd "getiterator", function_name_len=<optimized > out>, retval_ptr=0x7ffcfb317c60, param_count=0, arg1=0x0, arg2=0x0) > at ./Zend/zend_interfaces.c:103 >#12 0x000055775c23f623 in zend_user_it_new_iterator ***@***.***=0x7f3142c21040, >***@***.***=0x7f30e56e3430, ***@***.***=0x7ffcfb317c60) > at ./Zend/zend_interfaces.c:127 >``` > >### PHP Version > >PHP 7.4.27 > >### Operating System > >Ubuntu 20.04 > Is this a problem with 7.4.26 as well?