linux-kernel - Re: [PATCH] writeback: fix NULL dereference when device is gone

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Message-ID: <20130904182117.GE26609@mtj.dyndns.org>
Date:	Wed, 4 Sep 2013 14:21:17 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Peter Wu <lekensteyn@...il.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH] writeback: fix NULL dereference when device is gone

Hello,

On Thu, Aug 29, 2013 at 12:31:11AM +0200, Peter Wu wrote:
> I applied your fix in the workfn, but now dd does not stop with EIO. If I run 
> `sync`, then I see:
> 
> [11882.645618] quiet_error: 591905 callbacks suppressed
> [11882.650589] Buffer I/O error on device sdd, logical block 129652880
> [11882.656850] lost page write due to I/O error on sdd
> [11882.661974] Buffer I/O error on device sdd, logical block 129652881
> ...
> 
> Any other ideas? For now I will stick to the original patch. That probably 
> does not solve the root issues, but it is at least a workaround to prevent the 
> machine from locking up.

I'm out of ideas at the moment and maybe we should just stick to your
patch for now.  :(

Thanks.

-- 
tejun
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