linux-kernel - Re: mdraid6 problem post 3.5.0

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Date:	Fri, 17 Aug 2012 18:57:44 -0400
From:	John Drescher <drescherjm@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: mdraid6 problem post 3.5.0

On Fri, Aug 17, 2012 at 6:30 PM, John Drescher <drescherjm@...il.com> wrote:
> For the last few weeks I have been doing some reliability testing on a
>  mdraid6 array. One of my test was to physically hot remove a raid
> member disk. This worked flawlessly with gentoo-sources-3.5.0 for the
> 5 or so times I tried it with my 12 disk + 1 spare mdraid6 array.
> After pulling a disk a few seconds later the array automatically
> rebuilds with a spare and after finishing all data checks out via
> btrfs a scrub. However trying this with gentoo-sources-3.5.2 or the
> latest kernel.org git sources the machine does not start the rebuild
> and any access to /proc/mdstat or and disk access that is not in cache
> for that array just leads to an a long (possibly infinite) wait
> eventually forcing me to have to use the reset button when the sysrq
> key combinations fail to shut down the machine. I do see some kernel
> debug message in the console alt-ctrl-f12 but I was unable to save
> that to copy.
>
> Is this a known problem? If not it may be possible that I could bisect
> this next week to the patch that causes this behavior.
>

The same problem appears on gentoo-sources-3.5.1 so it appears this
problem was introduced between kernels 3.5.0 and 3.5.1. I will have to
debug this next week..

John
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