[php-src] Issue #10530: Segfaults after upgrade from 8.1.14 to 8.1.15

Issue: https://github.com/php/php-src/issues/10530 Author: Provoker ### Description Hi. After upgrading from 8.1.14 to 8.1.15, segfaults started occurring in code with fibers. Unfortunately we couldn't make a short reproduction example. I hope backtrace data from gdb will be enough to understand the problem. ``` Program received signal SIGSEGV, Segmentation fault. gc_mark_grey (stack=0x7fb4107facc0, ref=0x100000092) at ./Zend/zend_types.h:1211 1211 ./Zend/zend_types.h: No such file or directory. (gdb) bt #0 gc_mark_grey (stack=0x7fb4107facc0, ref=0x100000092) at ./Zend/zend_types.h:1211 #1 gc_mark_roots (stack=0x7fb4107facc0) at ./Zend/zend_gc.c:985 #2 zend_gc_collect_cycles () at ./Zend/zend_gc.c:1467 #3 0x0000560364deb867 in gc_possible_root_when_full (ref=0x7fb412563e38) at ./Zend/zend_gc.c:593 #4 0x0000560364debc97 in gc_possible_root (ref=<optimized out>) at ./Zend/zend_gc.c:643 #5 0x0000560364dc3ad1 in zend_assign_to_variable (strict=<optimized out>, value_type=4 '\004', value=<optimized out>, variable_ptr=<optimized out>) at ./Zend/zend_execute.h:163 #6 ZEND_ASSIGN_SPEC_CV_VAR_RETVAL_USED_HANDLER () at ./Zend/zend_vm_execute.h:46763 #7 0x0000560364dd6b3e in execute_ex (ex=0x7fb411486020) at ./Zend/zend_vm_execute.h:59714 #8 0x0000560364d619f4 in zend_call_function (fci=fci@entry=0x7fb412d62728, fci_cache=<optimized out>, fci_cache@entry=0x7fb412d62768) at ./Zend/zend_execute_API.c:912 #9 0x0000560364e07e71 in zend_fiber_execute (transfer=0x7fb4107fbfb0) at ./Zend/zend_fibers.c:484 #10 0x0000560364e08e4e in zend_fiber_trampoline (data=...) at ./Zend/zend_fibers.c:296 #11 0x0000560364d08f0f in make_fcontext () at make_x86_64_sysv_elf_gas.S:78 #12 0x0000000000000000 in ?? () ``` ### PHP Version 8.1.15 ### Operating System Debian 11