diff --git a/sys/kern/kern_shutdown.c b/sys/kern/kern_shutdown.c
--- a/sys/kern/kern_shutdown.c
+++ b/sys/kern/kern_shutdown.c
@@ -229,6 +229,7 @@
 
 int dumping __read_mostly;		/* system is dumping */
 int rebooting __read_mostly;		/* system is rebooting */
+bool dumped_core __read_mostly;		/* system successfully dumped core */
 /*
  * Used to serialize between sysctl kern.shutdown.dumpdevname and list
  * modifications via ioctl.
@@ -415,8 +416,10 @@
 
 		TAILQ_FOREACH(di, &dumper_configs, di_next) {
 			error = dumpsys(di);
-			if (error == 0)
+			if (error == 0) {
+				dumped_core = true;
 				break;
+			}
 		}
 	}
 
diff --git a/sys/sys/conf.h b/sys/sys/conf.h
--- a/sys/sys/conf.h
+++ b/sys/sys/conf.h
@@ -358,6 +358,7 @@
 };
 
 extern int dumping;		/* system is dumping */
+extern bool dumped_core;	/* system successfully dumped kernel core */
 
 /*
  * Save registers for later extraction from a kernel dump.