Re: Hang in bcache/qemu

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On Thu, Jan 19, 2017 at 01:22:47PM +0100, Jan Wiele wrote:
> Am Mittwoch, 18. Januar 2017, 09:48:30 CET schrieb Andre Noll:
> > On Wed, Jan 18, 04:35, Kai Krakow wrote
> > 
> > FWIW, I'm seeing this as well on different hardware, and with both
> > deadline and CFQ, so it's not a scheduler issue. The problem seems to
> > be the bcache writeback thread calling down_write(&dc->writeback_lock)
> > while already holding this lock.
> Yes, the bug doesn't get triggered when the caching mechanism is set to 
> writethrough.

Is there something else blocked that's holding writeback_lock?
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