From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kent Overstreet <kmo-PEzghdH756F8UrSeD/g0lQ@public.gmane.org>
Subject: Re: bcache disabled due to inconsistent ptrs
Date: Mon, 29 Jul 2013 12:13:05 -0700
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To: sheng qiu <herbert1984106-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
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On Sun, Jul 28, 2013 at 06:57:42PM -0500, sheng qiu wrote:
> generally the flash size is 40GB, RAM is 8GB. The workload first
> writes about 65GB of data and then do read/writes (10 threads) on
> those data.
> it runs less than 1 hour during the read/write step and nearly
> happened each time. now i was testing with less threads and see if
> this is the case.

Some kind of garbage collection bug... :/

Could you try the bcache-testing branch? It's got significantly improved
garbage collection code - if it's not fixed there, at least that code
should be easier to debug...