From: Jan Wiele <jan@wiele.org>
To: Kent Overstreet <kent.overstreet@gmail.com>
Cc: linux-bcache@vger.kernel.org
Subject: Re: Hang in bcache/qemu
Date: Thu, 19 Jan 2017 15:06:15 +0100 [thread overview]
Message-ID: <2468407.km8j8RHp0H@j-t460p> (raw)
In-Reply-To: <20170119134244.f6bydzrfsghq57ll@moria.home.lan>
Am Donnerstag, 19. Januar 2017, 04:42:44 CET schrieb Kent Overstreet:
> 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?
I'm not seeing any other blocked tasks in the kernel log, if it is that what
you mean.
If you could provide me with some instructions to follow on a hang, I will try
to reproduce it next weekend.
prev parent reply other threads:[~2017-01-19 14:06 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-11 17:34 Hang in bcache/qemu Jan Wiele
2017-01-18 3:35 ` Kai Krakow
2017-01-18 8:48 ` Andre Noll
2017-01-19 12:22 ` Jan Wiele
2017-01-19 13:42 ` Kent Overstreet
2017-01-19 14:06 ` Jan Wiele [this message]
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