Index: ddb/db_command.c
===================================================================
RCS file: /cvsroot/src/sys/ddb/db_command.c,v
retrieving revision 1.148.8.2
diff -p -u -r1.148.8.2 db_command.c
--- ddb/db_command.c	31 Jul 2018 17:01:20 -0000	1.148.8.2
+++ ddb/db_command.c	7 Sep 2018 01:17:12 -0000
@@ -1351,6 +1351,10 @@ db_reboot_cmd(db_expr_t addr, bool have_
 	 * called from cpu_reboot.
 	 */
 	db_recover = 0;
+	/* Avoid all mutex errors */
+#ifdef LOCKDEBUG
+	lockdebug_dismiss();
+#endif
 	panicstr = "reboot forced via kernel debugger";
 	cpu_reboot((int)bootflags, NULL);
 #else	/* _KERNEL */
Index: kern/subr_lockdebug.c
===================================================================
RCS file: /cvsroot/src/sys/kern/subr_lockdebug.c,v
retrieving revision 1.57.2.1
diff -p -u -r1.57.2.1 subr_lockdebug.c
--- kern/subr_lockdebug.c	2 Apr 2018 09:07:52 -0000	1.57.2.1
+++ kern/subr_lockdebug.c	7 Sep 2018 01:17:12 -0000
@@ -977,6 +977,19 @@ lockdebug_show_lockstats(void (*pr)(cons
 #endif	/* DDB */
 
 /*
+ * lockdebug_dismiss:
+ *
+ *      The system is rebooting, and potentially from an unsafe
+ *      place so avoid any future aborts.
+ */
+void
+lockdebug_dismiss(void)
+{
+
+	atomic_inc_uint_nv(&ld_panic);
+}
+
+/*
  * lockdebug_abort:
  *
  *	An error has been trapped - dump lock info and call panic().
Index: sys/lockdebug.h
===================================================================
RCS file: /cvsroot/src/sys/sys/lockdebug.h,v
retrieving revision 1.15.6.1
diff -p -u -r1.15.6.1 lockdebug.h
--- sys/lockdebug.h	2 Apr 2018 09:07:53 -0000	1.15.6.1
+++ sys/lockdebug.h	7 Sep 2018 01:17:12 -0000
@@ -53,6 +53,7 @@ typedef	struct lockops {
 #define	LOCKDEBUG_ABORT(f, ln, l, o, m) \
     lockdebug_abort(f, ln, l, o, m)
 
+void	lockdebug_dismiss(void);
 void	lockdebug_abort(const char *, size_t, volatile void *, lockops_t *,
     const char *);