[php-src] Issue #7982: Segmentation fault caused by updating to 8.1

Issue: https://github.com/php/php-src/issues/7982 Comment Author: JimmyBanks @damianwadley I have gotten the backtraces, there seems to be multiple different backtraces being generated by the segfaults, I have found three unique backtrace patterns, with the three line one consisting of 90% of the crashes. ``` Core was generated by php-fpm: pool www Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007f10442fa743 in ?? () [Current thread is 1 (LWP 6495)] (gdb) bt #0 0x00007f10442fa743 in ?? () #1 0x00007f1044306064 in ?? () #2 0x0000000000000000 in ?? () ``` ``` Core was generated by php-fpm: pool www Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007f104430f653 in ?? () [Current thread is 1 (LWP 6391)] (gdb) bt #0 0x00007f104430f653 in ?? () #1 0x00007f1044305d28 in ?? () #2 0x00007f1057213620 in ?? () #3 0x00007ffc8cb4eb60 in ?? () #4 0x00000000428d1b50 in ?? () #5 0x0000000000000006 in ?? () #6 0x00007f1057213550 in ?? () #7 0x00007f10442fbf4e in ?? () #8 0x00007f1057213550 in ?? () #9 0x00007f10442fd747 in ?? () #10 0x00007f1057266960 in ?? () #11 0x00007f1000000308 in ?? () #12 0x00007f10572135c0 in ?? () #13 0xc46124777e9cf200 in ?? () #14 0x000055fa39e7b000 in ?? () #15 0x00007f1057202fc8 in ?? () #16 0x00000000428d1b50 in ?? () #17 0x00007f1044301db5 in ?? () #18 0x0000000000000002 in ?? () #19 0x00007f1057213620 in ?? () #20 0x0000000043c400d8 in ?? () #21 0x00007f10443060b8 in ?? () #22 0x0000000000000000 in ?? () ``` ``` Core was generated by php-fpm: pool www Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007f104430c04c in ?? () [Current thread is 1 (LWP 12143)] (gdb) bt #0 0x00007f104430c04c in ?? () #1 0x00007f1057272730 in ?? () #2 0x00007f1044313429 in ?? () #3 0x00007f1057276348 in ?? () #4 0x00007f10442ff9c5 in ?? () #5 0x00007f1057213330 in ?? () #6 0x00007f1057276348 in ?? () #7 0x0000000044008f88 in ?? () #8 0x00007f10443060a3 in ?? () #9 0x0000000000000000 in ?? () ```