linux-kernel - Re: [PATCH] block: avoid infinite loop in get_task_io

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Message-ID: <4FC74E6A.3030606@fusionio.com>
Date:	Thu, 31 May 2012 12:56:42 +0200
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>, Alan Cox <alan@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] block: avoid infinite loop in get_task_io_context()

On 05/31/2012 12:51 PM, Eric Dumazet wrote:
> On Thu, 2012-05-31 at 12:47 +0200, Jens Axboe wrote:
>>  BUG: soft lockup - CPU#3 stuck for 22s ! [mountall.1603]
>>
>> Eric, do you have a task trace to go with this lockup, where task !=
>> current?
>>
>> In any case, it is a legit bug fix. I have applied it.
>>
> 
> Unfortunately I couldn't get netconsole working at this stage...
> 
> syscall was sys_ioprio_set()

That's good enough, then it all makes sense. I guess we could be
checking PF_EXITING earlier, but I think the patch is fine as-is.

-- 
Jens Axboe

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