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Buffer cache mistake

This morning at 15:48 UTC, while aiming to add some dtrace probes to
the buffer cache (normally a totally innocuous change so I wasn't
paying very close attention), I committed a mistake that totally
screwed it up -- causing bbusy to return a result indicating success
even if it actually failed:

This can kinda badly screw up file systems (primarily metadata but
corruption in data too), so I recommend you update to the fix which I
committed as soon as I noticed this evening at 02:04 UTC:


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