D25914.id.diff
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	Index: head/sys/kern/vfs_bio.c
	===================================================================
	--- head/sys/kern/vfs_bio.c
	+++ head/sys/kern/vfs_bio.c
	@@ -1637,7 +1637,7 @@
	buf_alloc(struct bufdomain *bd)
	{
	struct buf *bp;
	- int freebufs;
	+ int freebufs, error;

	/*
	* We can only run out of bufs in the buf zone if the average buf
	@@ -1660,8 +1660,10 @@
	if (freebufs == bd->bd_lofreebuffers)
	bufspace_daemon_wakeup(bd);

	- if (BUF_LOCK(bp, LK_EXCLUSIVE \| LK_NOWAIT, NULL) != 0)
	- panic("getnewbuf_empty: Locked buf %p on free queue.", bp);
	+ error = BUF_LOCK(bp, LK_EXCLUSIVE, NULL);
	+ KASSERT(error == 0, ("%s: BUF_LOCK on free buf %p: %d.", __func__, bp,
	+ error));
	+ (void)error;

	KASSERT(bp->b_vp == NULL,
	("bp: %p still has vnode %p.", bp, bp->b_vp));