D22689.diff
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	Index: sys/kern/vfs_subr.c
	===================================================================
	--- sys/kern/vfs_subr.c
	+++ sys/kern/vfs_subr.c
	@@ -4340,34 +4340,33 @@
	{
	struct vnode vp, mvp;
	struct vm_object *obj;
	+ struct thread *td;

	CTR2(KTR_VFS, "%s: mp %p", __func__, mp);

	if ((mp->mnt_kern_flag & MNTK_NOMSYNC) != 0)
	return;

	+ td = curthread;
	MNT_VNODE_FOREACH_ACTIVE(vp, mp, mvp) {
	obj = vp->v_object;
	if (obj != NULL && vm_object_mightbedirty(obj) &&
	(flags == MNT_WAIT \|\| VOP_ISLOCKED(vp) == 0)) {
	- if (!vget(vp,
	- LK_EXCLUSIVE \| LK_RETRY \| LK_INTERLOCK,
	- curthread)) {
	- if (vp->v_vflag & VV_NOSYNC) { /* unlinked */
	- vput(vp);
	- continue;
	- }
	-
	- obj = vp->v_object;
	- if (obj != NULL) {
	- VM_OBJECT_WLOCK(obj);
	- vm_object_page_clean(obj, 0, 0,
	- flags == MNT_WAIT ?
	- OBJPC_SYNC : OBJPC_NOSYNC);
	- VM_OBJECT_WUNLOCK(obj);
	- }
	+ vget(vp, LK_EXCLUSIVE \| LK_RETRY \| LK_INTERLOCK, td);
	+ if (vp->v_vflag & VV_NOSYNC) { /* unlinked */
	vput(vp);
	+ continue;
	+ }
	+
	+ obj = vp->v_object;
	+ if (obj != NULL) {
	+ VM_OBJECT_WLOCK(obj);
	+ vm_object_page_clean(obj, 0, 0,
	+ flags == MNT_WAIT ?
	+ OBJPC_SYNC : OBJPC_NOSYNC);
	+ VM_OBJECT_WUNLOCK(obj);
	}
	+ vput(vp);
	} else
	VI_UNLOCK(vp);
	}