D9786.diff
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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
	@@ -45,6 +45,7 @@
	#ifdef GPROF
	#include <sys/gmon.h>
	#endif
	+#include <sys/kdb.h>
	#include <sys/kernel.h>
	#include <sys/ktr.h>
	#include <sys/lock.h>
	@@ -1269,6 +1270,12 @@
	CPU_CLR_ATOMIC(cpu, &started_cpus);
	CPU_CLR_ATOMIC(cpu, &stopped_cpus);

	+ /*
	+ * We don't broadcast TLB invalidations to other CPUs when they are
	+ * stopped. Hence, we clear the TLB before resuming.
	+ */
	+ invltlb_glob();
	+
	#if defined(__amd64__) && defined(DDB)
	amd64_db_resume_dbreg();
	#endif
	@@ -1427,6 +1434,10 @@
	uint32_t generation;
	int cpu;

	+ /* It is not necessary to signal other CPUs while in the debugger. */
	+ if (kdb_active \|\| panicstr != NULL)
	+ return;
	+
	/*
	* Check for other cpus. Return if none.
	*/