Description:
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apc crashes php on windows when php is running as an apache fcgi executable. It is not 100% reproducible but often happens when several php-cgi.exe instances are running simultaneously - i used phpmyadmin front page for tests which has multiple frames.
I made a custom build ob php_apc with debug info enabled to find code location where the crash happens:

Stack trace:

008af480 68f47de4 php_apc!apc_cache_find_slot+0x77 [c:\tmp\php_pecl\php-5.4.32-src\ext\apc-3.1.13\apc_cache.c @ 648]
008af500 68f51bc9 php_apc!apc_cache_find+0x44 [c:\tmp\php_pecl\php-5.4.32-src\ext\apc-3.1.13\apc_cache.c @ 699]
008af71c 5f7c6e67 php_apc!my_compile_file+0x1c9 [c:\tmp\php_pecl\php-5.4.32-src\ext\apc-3.1.13\apc_main.c @ 520]
WARNING: Stack unwind information not available. Following frames may be wrong.
008af7cc 5f85e33b php5ts!zend_save_lexical_state+0x207
008af840 5f814ffd php5ts!inet_ntop+0x27b
008af85c 5f84382c php5ts!execute+0x1fd
008af874 765ead55 php5ts!zend_execute_scripts+0x14c
00000000 00000000 USER32!PostThreadMessageA+0x4c

Source line:
while (*slot) {
      if(key.type == (*slot)->key.type) {  <---- it crashes here
        if(key.type == APC_CACHE_KEY_FILE) {
 
For some reason windbg didn't show me variable values but i guess that something was NULL here,