Re: bcache oops in bch_insert_data with the latest stables fixes (3.10.15)

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Le 06/10/2013 17:50, Gabriel de Perthuis a écrit :
> Le 06/10/2013 12:38, Cyril B. a écrit :
>> Hello,
>>
>> I get the following oops immediately after booting on 3.10.15.
>> Everything works fine in 3.10.10. Both the backing and cache devices are
>> on top of mdadm.
> 
> Reverting c0f04d88e46d14de51f4baebb6efafb7d59e9f96 fixes it; it was one
> of the few commits that's in 3.12 and -stable but not in
> bcache-for-3.11.  That commit causes bch_insert_data to be called with
> an unset op.cache_bio.

Pinging stable,
http://git.kernel.org/linus/c0f04d88e46d14de51f4baebb6efafb7d59e9f96
should be reverted.  It was in 3.11.4 and 3.10.15 (and 3.12-rc3).
It breaks bcache's writeback mode by calling bch_writeback_data without
setting cache_bio (it's more visible here[1]).  There's a bit of
indirection through closure calls, but it could never work.

|1]
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c0f04d88e46d14de51f4baebb6efafb7d59e9f96&context=8

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