Description:
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Custom PHP extension compiled in Visual Studio 2005. (which means it is compiled with CRT library msvcr80.dll)
Extension declares internal class for exception. PHP cause crash (0xc0000005 Access denied) during shutdown of execution.
Problem is that extension allocates string in its own CRT. This string used then by php5ts without copying content of string (just using pointer). During shutdown procedure extension is already unloaded, but php5ts tries to free memory allocated in extension and cause crash.

Reproduce code:
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Declaring exception in ZEND_MINIT_FUNCTION(myownextension):

zend_class_entry ce, *pce;
INIT_CLASS_ENTRY(ce, "MyOwnException", NULL);
pce = zend_register_internal_class_ex(&ce, zend_exception_get_default(TSRMLS_C), NULL TSRMLS_CC);



Expected result:
----------------
Expected: No crash.

Proposed fix is:
--- Zend/zend_API.c	Fri Mar 07 00:28:47 2008
+++ Zend/zend_API.c	Thu Jun 18 08:40:53 2009
@@ -1992,6 +1992,7 @@
 	zend_class_entry *class_entry = malloc(sizeof(zend_class_entry));
 	char *lowercase_name = malloc(orig_class_entry->name_length + 1);
 	*class_entry = *orig_class_entry;
+	class_entry->name = strdup(orig_class_entry->name);
 
 	class_entry->type = ZEND_INTERNAL_CLASS;
 	zend_initialize_class_data(class_entry, 0 TSRMLS_CC);

Probably you should change also logic of INIT_CLASS_ENTRY macros to avoid memory leak.


Actual result:
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Crash occurs at the following call stack:

# ZEND_API void destroy_zend_class(zend_class_entry **pce)
# zend_hash_destroy(compiler_globals->class_table);
# static void compiler_globals_dtor(zend_compiler_globals *compiler_globals TSRMLS_DC)

Line that cause exception is zend_opcode.c (200):
free(ce->name);