linux-kernel - Re: 2.6.36-rc1 hangs during XFS barrier test for /

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Message-ID: <AANLkTimN1u2fq3LEEGKQfF_+RkVKtqDbUS70mXTKTSq=@mail.gmail.com>
Date:	Sun, 22 Aug 2010 18:39:27 +0200
From:	Torsten Kaiser <just.for.lkml@...glemail.com>
To:	paulmck@...ux.vnet.ibm.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 2.6.36-rc1 hangs during XFS barrier test for /

On Fri, Aug 20, 2010 at 9:32 PM, Paul E. McKenney
<paulmck@...ux.vnet.ibm.com> wrote:
> On Fri, Aug 20, 2010 at 05:08:17PM +0200, Torsten Kaiser wrote:
>> Hello,
>>
>> after installing 2.6.36-rc1 my system gets stuck during "Mounting root..."
>>
>> I'm using an initramfs to mount the root fs, because I'm using a
>> stacked setup with md (raid1) -> dm-crypt -> xfs.

My initramfs seems to have eaten the real OOPS. It was the (already
reported) "kernel BUG at drivers/scsi/scsi_lib.c:1113".

I will just test with -rc2 again. :-)

>> Strange side effect: sometimes the cursor stops blinking for a few
>> seconds, but then resumes blinking. Each of these blinking stalls are
>> accompanied by a RCU stall message.
>
> This indicates that you have a "longer than average loop", probably
> with interrupts disabled across the loop.  Documentation/RCU/stallwarn.txt
> has more information on this condition.

The stall was detected on CPU #2, the same CPU that got the
scsi_lib-BUG. So that very much just looks like a fallout from that.

Thanks for you tipp, but I think, I will only bother you again, if I'm
still seeing this after that OOPS has gotten fixed.

Thanks,

Torsten
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