D28375.id.diff
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D28375.id.diff
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	diff --git a/sys/kern/vfs_bio.c b/sys/kern/vfs_bio.c
	--- a/sys/kern/vfs_bio.c
	+++ b/sys/kern/vfs_bio.c
	@@ -3888,8 +3888,15 @@

	/* Attempt lockless lookup first. */
	bp = gbincore_unlocked(bo, blkno);
	- if (bp == NULL)
	+ if (bp == NULL) {
	+ /*
	+ * With GB_NOCREAT we must be sure about not finding the buffer
	+ * as it may have been reassigned during unlocked lookup.
	+ */
	+ if ((flags & GB_NOCREAT) != 0)
	+ goto loop;
	goto newbuf_unlocked;
	+ }

	error = BUF_TIMELOCK(bp, LK_EXCLUSIVE \| LK_NOWAIT, NULL, "getblku", 0,
	0);