From: Matthias Ferdinand <bcache@mfedv.net>
To: Kent Overstreet <kmo@daterainc.com>
Cc: nks@daterainc.com, linux-bcache@vger.kernel.org
Subject: Re: md-raid5 with bcache member devices => kernel panic
Date: Fri, 6 Dec 2013 00:08:13 +0100 [thread overview]
Message-ID: <20131205230813.GF1848@teapot> (raw)
In-Reply-To: <20131205225234.GA4054@kmo>
On Thu, Dec 05, 2013 at 02:52:34PM -0800, Kent Overstreet wrote:
> On Thu, Dec 05, 2013 at 10:29:13PM +0100, Matthias Ferdinand wrote:
> Erk. I thought I was done with these bugs. Nick, do you think you could try and
> track this down?
>
> Looking at this:
> http://dl.mfedv.net/md5raid_on_bcache_panic/mdraid5_on_bcache_panic_3.12.2.txt
>
> that's a null pointer deref; if Matthias could get the exact line number it
I have no idea how to do that - can you help me out on that?
> Matthias - I'm running bcache on top of a raid6 at home and I've never seen
I only get panics when I use md-raid on top of bcaches:
LVM
|
md-raid5
/ | \
bcache0 bcache1 bcache2
| | |
sdb6 sdc6 sdd6
(probably an unusual setup; just playing around...)
To reproduce, just writing anything to an LV on top of this should do
(linear writes). If some r/w random i/o is then added (start of VM in my
setup), it breaks.
Regards
Matthias
next prev parent reply other threads:[~2013-12-05 23:08 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-05 21:29 md-raid5 with bcache member devices => kernel panic Matthias Ferdinand
2013-12-05 22:52 ` Kent Overstreet
2013-12-05 23:08 ` Matthias Ferdinand [this message]
2013-12-05 23:15 ` Kent Overstreet
2013-12-06 0:00 ` Matthias Ferdinand
2013-12-06 3:22 ` Paul B. Henson
2013-12-08 23:53 ` Matthias Ferdinand
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