abort() in OOM case

Closes GH-22637

Author: realFlowControl

NEWS

@@ -11,6 +11,7 @@ PHP                                                                        NEWS
     iterator). (iliaal)
   . Lock unmodified readonly properties for modification after clone-with.
     (NickSdot)
+  . abort() instead of exit() on hard OOM. (realFlowControl)
 
 - Calendar:
   . Fixed bug GH-22602 (gregoriantojd() and juliantojd() integer overflow with

UPGRADING

@@ -533,6 +533,10 @@ PHP 8.6 UPGRADE NOTES
 13. Other Changes
 ========================================
 
+- Core:
+  . In case of a hard OOM PHP now calls abort() instead of exit(1), changing
+    the exit code to 134 and possibly creating a core dump.
+
 ========================================
 14. Performance Improvements
 ========================================

Zend/zend_alloc.c

@@ -2974,7 +2974,7 @@ ZEND_API void refresh_memory_manager(void)
 static ZEND_COLD ZEND_NORETURN void zend_out_of_memory(void)
 {
 	fprintf(stderr, "Out of memory\n");
-	exit(1);
+	abort();
 }
 
 #if ZEND_MM_CUSTOM