from Zend/zend_list.c

Note that list is passed in, but &EG(regular_list) is used wherever list should be used.

static inline int zend_list_do_delete(HashTable *list,int id)
{
	zend_rsrc_list_entry *le;
	ELS_FETCH();
	
	if (zend_hash_index_find(&EG(regular_list), id, (void **) &le)==SUCCESS) {
/*		printf("del(%d): %d->%d\n", id, le->refcount, le->refcount-1); */
		if (--le->refcount<=0) {
			return zend_hash_index_del(&EG(regular_list), id);
		} else {
			return SUCCESS;
		}
	} else {
		return FAILURE;
	}
}

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.
.

Scroll down, and we see that both zend_list_delete and zend_plist_delete are calling this with different hashtable args.  It looks as though we must be leaking memory whenever zend_plist_delete is called.

ZEND_API int zend_list_delete(int id)
{
	ELS_FETCH();

	return zend_list_do_delete(&EG(regular_list), id);
}


ZEND_API int zend_plist_delete(int id)
{
	ELS_FETCH();

	return zend_list_do_delete(&EG(persistent_list), id);
}