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Date:	Thu, 20 Dec 2012 14:40:22 +0100
From:	Jens Axboe <>
To:	Arthur Marsh <>
Subject: Re: git-bisect points to block: discard granularity might not be
 power of 2

On 2012-12-20 14:33, Arthur Marsh wrote:
> Hi,
>       one of my machines is locking up fairly early in the boot process (about 1.4 seconds in) with recent kernels and a git-bisect lead to:
> commit 8dd2cb7e880d2f77fba53b523c99133ad5054cfd
> Author: Shaohua Li <>
> Date:   Fri Dec 14 11:15:36 2012 +0800
>     block: discard granularity might not be power of 2
>     In MD raid case, discard granularity might not be power of 2, for example, a
>     4-disk raid5 has 3*chunk_size discard granularity. Correct the calculation for
>     such cases.
>     Reported-by: Neil Brown <>
>     Signed-off-by: Shaohua Li <>
>     Signed-off-by: Jens Axboe <>
> The machine is a dual core Pentium IV with 2 IDE and one SCSI disk. I've tried pulling the SCSI card out and the problem still occurs.
> There are no software raid arrays assembled in the boot process.
> Short of taking a photo of the monitor with the dump on it I'm a bit stuck as to what to do to further identify the problem.

Should be fixed in Linus' tree as-of yesterday. So please try that and
report back if it doesn't work.

Jens Axboe

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