do not try to handle signals, when globals are inconsistent

Author: weltling

Zend/zend_signal.c

@@ -74,12 +74,17 @@ void zend_signal_handler_defer(int signo, siginfo_t *siginfo, void *context)
 {
 	int errno_save = errno;
 	zend_signal_queue_t *queue, *qtmp;
+	zend_bool is_handling_safe = 1;
 
 #ifdef ZTS
 	ZEND_TSRMLS_CACHE_UPDATE();
+	/* A signal could hit after TSRM shutdown, in this case globals are already freed. */
+	if (NULL == TSRMG_BULK_STATIC(zend_signal_globals_id, zend_signal_globals_t *)) {
+		is_handling_safe = 0;
+	}
 #endif
 
-	if (EXPECTED(SIGG(active))) {
+	if (EXPECTED(is_handling_safe && SIGG(active))) {
 		if (UNEXPECTED(SIGG(depth) == 0)) { /* try to handle signal */
 			if (UNEXPECTED(SIGG(blocked))) {
 				SIGG(blocked) = 0;
@@ -162,7 +167,14 @@ static void zend_signal_handler(int signo, siginfo_t *siginfo, void *context)
 	int errno_save = errno;
 	struct sigaction sa = {{0}};
 	sigset_t sigset;
-	zend_signal_entry_t p_sig = SIGG(handlers)[signo-1];
+	zend_signal_entry_t p_sig;
+#ifdef ZTS
+	if (NULL == TSRMG_BULK_STATIC(zend_signal_globals_id, zend_signal_globals_t *)) {
+		p_sig.flags = 0;
+		p_sig.handler = SIG_DFL;
+	} else 
+#endif
+	p_sig = SIGG(handlers)[signo-1];
 
 	if (p_sig.handler == SIG_DFL) { /* raise default handler */
 		if (sigaction(signo, NULL, &sa) == 0) {