1 files changed, 4 insertions, 0 deletions

diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index 3e4b17f2373c..52ad0ef2434f 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -56,6 +56,7 @@
 #include <sys/fcntl.h>
 #include <sys/kernel.h>
 #include <sys/kthread.h>
+#include <sys/ktr.h>
 #include <sys/malloc.h>
 #include <sys/mount.h>
 #include <sys/namei.h>
@@ -68,6 +69,7 @@
 #include <sys/vnode.h>
 
 #include <machine/limits.h>
+#include <machine/mutex.h>
 
 #include <vm/vm.h>
 #include <vm/vm_object.h>
@@ -960,6 +962,8 @@ sched_sync(void)
 	int s;
 	struct proc *p = updateproc;
 
+	mtx_enter(&Giant, MTX_DEF);
+
 	EVENTHANDLER_REGISTER(shutdown_pre_sync, shutdown_kproc, p,
 	    SHUTDOWN_PRI_LAST);