Index: head/sys/kern/kern_shutdown.c
===================================================================
--- head/sys/kern/kern_shutdown.c
+++ head/sys/kern/kern_shutdown.c
@@ -134,6 +134,14 @@
 SYSCTL_INT(_kern, OID_AUTO, sync_on_panic, CTLFLAG_RWTUN,
 	&sync_on_panic, 0, "Do a sync before rebooting from a panic");
 
+static bool poweroff_on_panic = 0;
+SYSCTL_BOOL(_kern, OID_AUTO, poweroff_on_panic, CTLFLAG_RWTUN,
+	&poweroff_on_panic, 0, "Do a power off instead of a reboot on a panic");
+
+static bool powercycle_on_panic = 0;
+SYSCTL_BOOL(_kern, OID_AUTO, powercycle_on_panic, CTLFLAG_RWTUN,
+	&powercycle_on_panic, 0, "Do a power cycle instead of a reboot on a panic");
+
 static SYSCTL_NODE(_kern, OID_AUTO, shutdown, CTLFLAG_RW, 0,
     "Shutdown environment");
 
@@ -797,6 +805,10 @@
 	/* thread_unlock(td); */
 	if (!sync_on_panic)
 		bootopt |= RB_NOSYNC;
+	if (poweroff_on_panic)
+		bootopt |= RB_POWEROFF;
+	if (powercycle_on_panic)
+		bootopt |= RB_POWERCYCLE;
 	kern_reboot(bootopt);
 }
 
Index: head/tools/tools/sysdoc/tunables.mdoc
===================================================================
--- head/tools/tools/sysdoc/tunables.mdoc
+++ head/tools/tools/sysdoc/tunables.mdoc
@@ -1035,6 +1035,20 @@
 This is a read-only variable.
 
 ---
+kern.powercycle_on_panic
+bool
+
+In the event of a panic, this variable controls whether or not the
+system should try to power cycle instead of rebooting.
+
+---
+kern.poweroff_on_panic
+bool
+
+In the event of a panic, this variable controls whether or not the
+system should try to power off instead of rebooting.
+
+---
 kern.proc.all
 
 ---