D31450.diff
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	diff --git a/sys/kern/vfs_mount.c b/sys/kern/vfs_mount.c
	--- a/sys/kern/vfs_mount.c
	+++ b/sys/kern/vfs_mount.c
	@@ -2084,10 +2084,15 @@
	* just re-enqueue on the end of the taskqueue.
	*/
	if ((flags & MNT_DEFERRED) == 0) {
	- while (!TAILQ_EMPTY(&mp->mnt_uppers)) {
	+ while (error == 0 && !TAILQ_EMPTY(&mp->mnt_uppers)) {
	mp->mnt_kern_flag \|= MNTK_TASKQUEUE_WAITER;
	- msleep(&mp->mnt_taskqueue_link, MNT_MTX(mp), 0,
	- "umntqw", 0);
	+ error = msleep(&mp->mnt_taskqueue_link,
	+ MNT_MTX(mp), PCATCH, "umntqw", 0);
	+ }
	+ if (error != 0) {
	+ MNT_REL(mp);
	+ MNT_IUNLOCK(mp);
	+ return (error);
	}
	} else if (!TAILQ_EMPTY(&mp->mnt_uppers)) {
	MNT_IUNLOCK(mp);