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	Index: head/sys/x86/x86/mp_x86.c
	===================================================================
	--- head/sys/x86/x86/mp_x86.c
	+++ head/sys/x86/x86/mp_x86.c
	@@ -1406,8 +1406,17 @@
	CPU_SET_ATOMIC(cpu, &stopped_cpus);

	/* Wait for restart */
	- while (!CPU_ISSET(cpu, &started_cpus))
	- ia32_pause();
	+ while (!CPU_ISSET(cpu, &started_cpus)) {
	+ ia32_pause();
	+
	+ /*
	+ * Halt non-BSP CPUs on panic -- we're never going to need them
	+ * again, and might as well save power / release resources
	+ * (e.g., overprovisioned VM infrastructure).
	+ */
	+ while (__predict_false(!IS_BSP() && panicstr != NULL))
	+ halt();
	+ }

	cpustop_handler_post(cpu);
	}