John-Mark Gurney fb180e2186 fix a bug where we access a bread buffer after we have brelse'd it...
The kernel normally didn't unmap/context switch away before we accessed
the buffer most of the time, but under heavy I/O pressure and lots of
mount/unmounting this would cause a fault on nofault panic...

Reviewed by:	dteske
Approved by:	re (kib)
Sponsored by:	Vicor
MFC after:	3 days
2013-09-25 02:48:12 +00:00
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