Bug #4008: PHP crashes in module shutdown

From: dean.bennett@home.com Operating system: Windows 98 & NT PHP version: 3.0.15 PHP Bug Type: Reproduceable crash Bug description: PHP crashes in module shutdown I have been porting the Sybase module to work on Windows platforms, and had a crash that would occur after php processed the file. It would occur if the dll was loaded with extension= in the php3.ini file, but NOT if the dll was loaded with the dl() function. The sybase module allocates some memory in the php3_rinit_sybase() function and releases it in php3_rshutdown_sybase(). The crash occurs in the efree call (which does a memset to the memory when the module is compiled in DEBUG mode). In main.c, the function php3_module_startup() calls start_memory_manager(), a bunch of init routines, module_startup_modules(), and then shutdown_memory_manager(). The call to shutdown_memory_manager() nukes the memory on Windows (fills it with 0xdd), which causes it to crash when it tries to free the memory when the module shutdown is called. Removing the call to shutdown_memory_manager() prevents the crash. It seems a little odd to shutdown the memory manager in a startup routine. Perhaps this was meant to be called if the module startups failed? This only seems to happen on Windows platforms, I haven't seen a problem yet on any Unix platforms.