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-rw-r--r--sys/kern/vfs_subr.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/sys/kern/vfs_subr.c b/sys/kern/vfs_subr.c
index 0a8b352..053c385 100644
--- a/sys/kern/vfs_subr.c
+++ b/sys/kern/vfs_subr.c
@@ -3511,6 +3511,11 @@ vop_lock_pre(void *ap)
{
struct vop_lock_args *a = ap;
+ if (a->a_vp->v_iflag & VI_XLOCK &&
+ a->a_vp->v_vxthread != curthread) {
+ vprint("vop_lock_pre:", a->a_vp);
+ panic("vop_lock_pre: locked while xlock held.\n");
+ }
if ((a->a_flags & LK_INTERLOCK) == 0)
ASSERT_VI_UNLOCKED(a->a_vp, "VOP_LOCK");
else
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