Index: head/share/man/man9/Makefile
===================================================================
--- head/share/man/man9/Makefile
+++ head/share/man/man9/Makefile
@@ -1135,6 +1135,7 @@
 	osd.9 osd_get.9 \
 	osd.9 osd_register.9 \
 	osd.9 osd_set.9
+MLINKS+=panic.9 vpanic.9
 MLINKS+=pbuf.9 getpbuf.9 \
 	pbuf.9 relpbuf.9 \
 	pbuf.9 trypbuf.9
Index: head/share/man/man9/panic.9
===================================================================
--- head/share/man/man9/panic.9
+++ head/share/man/man9/panic.9
@@ -31,7 +31,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd August 11, 1995
+.Dd April 23, 2015
 .Dt PANIC 9
 .Os
 .Sh NAME
@@ -42,10 +42,14 @@
 .In sys/systm.h
 .Ft void
 .Fn panic "const char *fmt" ...
+.Ft void
+.Fn vpanic "const char *fmt" "va_list ap"
 .Sh DESCRIPTION
 The
 .Fn panic
-function terminates the running system.
+and
+.Fn vpanic
+functions terminate the running system.
 The message
 .Fa fmt
 is a
Index: head/sys/kern/kern_shutdown.c
===================================================================
--- head/sys/kern/kern_shutdown.c
+++ head/sys/kern/kern_shutdown.c
@@ -154,7 +154,6 @@
 static void shutdown_halt(void *junk, int howto);
 static void shutdown_panic(void *junk, int howto);
 static void shutdown_reset(void *junk, int howto);
-static void vpanic(const char *fmt, va_list ap) __dead2;
 
 /* register various local shutdown events */
 static void
@@ -676,7 +675,7 @@
 	vpanic(fmt, ap);
 }
 
-static void
+void
 vpanic(const char *fmt, va_list ap)
 {
 #ifdef SMP
Index: head/sys/sys/systm.h
===================================================================
--- head/sys/sys/systm.h
+++ head/sys/sys/systm.h
@@ -187,6 +187,7 @@
 void	g_waitidle(void);
 
 void	panic(const char *, ...) __dead2 __printflike(1, 2);
+void	vpanic(const char *, __va_list) __dead2 __printflike(1, 0);
 
 void	cpu_boot(int);
 void	cpu_flush_dcache(void *, size_t);