I am using Nette Tester on Windows, which is a framework to test applications written in Nette (another PHP-based web development network), to test my apps. Up until XDebug 3.3.2, inclusive, there was no problem with it.

With XDebug 3.4.0 beta 1, all the tests crash with C0000005 error (Access Violation) in php8ts.dll. So far, I was unable to transform my unwieldy Nette Tester script complex to a nimble 20-line test script which would reproduce the issue... but I was at least able to run it under gdb and the gdb crash stack says

Thread 1 received signal SIGSEGV, Segmentation fault.
0x00007ff81da52cd8 in zend_hash_str_find@@24 () from C:\xampp\php\php8ts.dll
(gdb) bt full
#0 0x00007ff81da52cd8 in zend_hash_str_find@@24 () from C:\xampp\php\php8ts.dll
No symbol table info available.
#1 0x00007ff86bc7878c in xdebug_init_oparray () from C:\xampp\php\ext\php_xdebug.dll
No symbol table info available.
0000002 0x00007ff86bc8d615 in xdebug_init_oparray () from C:\xampp\php\ext\php_xdebug.dll
No symbol table info available.
0000003 0x00007ff86bc8d9ea in xdebug_init_oparray () from C:\xampp\php\ext\php_xdebug.dll
No symbol table info available.
0000004 0x00007ff86bc74ef4 in xdebug_init_oparray () from C:\xampp\php\ext\php_xdebug.dll
No symbol table info available.
0000005 0x00007ff86bc73b9b in xdebug_init_oparray () from C:\xampp\php\ext\php_xdebug.dll
No symbol table info available.
0000006 0x00007ff81dfb6f03 in zend_objects_store_mark_destructed@@8 () from C:\xampp\php\php8ts.dll
No symbol table info available.
0000007 0x00007ff81dea9d01 in php8ts!libiconv_set_relocation_prefix () from C:\xampp\php\php8ts.dll
No symbol table info available.
0000008 0x00007ff81dc158b9 in php_free_shutdown_functions () from C:\xampp\php\php8ts.dll
No symbol table info available.
0000009 0x00007ff81da802df in zend_hash_apply@@16 () from C:\xampp\php\php8ts.dll
No symbol table info available.
0000010 0x00007ff81dc0e797 in php_call_shutdown_functions () from C:\xampp\php\php8ts.dll
No symbol table info available.
0000011 0x00007ff81da4da7a in php_request_shutdown () from C:\xampp\php\php8ts.dll
No symbol table info available.
0000012 0x00007ff77cfd241e in ?? ()
No symbol table info available.

I was unable to find the symbol file for the dll online.

My suspicion is that the problem is caused by multi-process character of Nette Tester. It uses proc_open to create multiple independent php instances. But I was as of now unable to reproduce the problem in a short script. My attempts to just create a separate php interpreter using proc_open, running some hello world script in a separate process and wait for its exit, never reproduced the problem.

In the Nette Tester context, though, the problem appears always, at the exit of each thread. Maybe I could at least gain some better data if I could get the symbol file for the dll.