D44047.diff
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	diff --git a/sys/kern/uipc_usrreq.c b/sys/kern/uipc_usrreq.c
	--- a/sys/kern/uipc_usrreq.c
	+++ b/sys/kern/uipc_usrreq.c
	@@ -594,8 +594,19 @@
	error = mac_vnode_check_create(td->td_ucred, nd.ni_dvp, &nd.ni_cnd,
	&vattr);
	#endif
	- if (error == 0)
	+ if (error == 0) {
	+ /*
	+ * The prior lookup may have left LK_SHARED in cn_lkflags,
	+ * and VOP_CREATE technically only requires the new vnode to
	+ * be locked shared. Most filesystems will return the new vnode
	+ * locked exclusive regardless, but we should explicitly
	+ * specify that here since we require it and assert to that
	+ * effect below.
	+ */
	+ nd.ni_cnd.cn_lkflags = (nd.ni_cnd.cn_lkflags & ~LK_SHARED) \|
	+ LK_EXCLUSIVE;
	error = VOP_CREATE(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
	+ }
	NDFREE_PNBUF(&nd);
	if (error) {
	VOP_VPUT_PAIR(nd.ni_dvp, NULL, true);