[php-src] Issue #8927: Crash on restart PHP FPM

Issue: https://github.com/php/php-src/issues/8927 Author: erlandl4g ### Description A restart was issued on Ubuntu 20.04: systemctl restart apache2 systemctl restart php7.4-fpm Which resulted in PHP and PHP FPM crash Not very valuable dump as I have no core file available but might help: ``` Id Target Id Frame * 1 Thread 0x7f399f3d4500 (LWP 1537188) 0x0000557950ee0083 in execute_ex () Thread 1 (Thread 0x7f399f3d4500 (LWP 1537188)): #0 0x0000557950ee0083 in execute_ex () #1 0x0000557950ee778b in zend_execute () #2 0x0000557950e5e6bc in zend_execute_scripts () #3 0x0000557950dfe300 in php_execute_script () #4 0x0000557950ee98c2 in ?? () #5 0x0000557950cc5978 in ?? () #6 0x00007f39a12ed083 in __libc_start_main (main=0x557950cc5570, argc=18, argv=0x7ffd257687d8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd257687c8) at ../csu/libc-start.c:308 #7 0x0000557950cc5b1e in _start () #0 0x0000557950ee0083 in execute_ex () No symbol table info available. #1 0x0000557950ee778b in zend_execute () No symbol table info available. #2 0x0000557950e5e6bc in zend_execute_scripts () No symbol table info available. #3 0x0000557950dfe300 in php_execute_script () No symbol table info available. #4 0x0000557950ee98c2 in ?? () No symbol table info available. #5 0x0000557950cc5978 in ?? () No symbol table info available. #6 0x00007f39a12ed083 in __libc_start_main (main=0x557950cc5570, argc=18, argv=0x7ffd257687d8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffd257687c8) at ../csu/libc-start.c:308 self = <optimized out> result = <optimized out> unwind_buf = {cancel_jmp_buf = {{jmp_buf = {93979537254944, -897266838300228344, 93979534973680, 140725231978448, 0, 0, 897921108148258056, 1008532319663719688}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x12, 0x7ffd257687d8}, data = {prev = 0x0, cleanup = 0x0, canceltype = 18}}} not_first_call = <optimized out> #7 0x0000557950cc5b1e in _start () No symbol table info available. No symbol table info available. No core file now. ``` ### PHP Version PHP 7.4.3 ### Operating System Ubuntu 20.04