linux-kernel - Re: [feature] automatically detect hung TASK

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Date:	Wed, 05 Dec 2007 17:31:28 -0500
From:	Mark Lord <lkml@....ca>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Radoslaw Szkodzinski <lkml@...ralstorm.puszkin.org>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [feature] automatically detect hung TASK_UNINTERRUPTIBLE tasks

Arjan van de Ven wrote:
> On Mon, 3 Dec 2007 11:27:15 +0100
> Andi Kleen <andi@...stfloor.org> wrote:
> 
>>> Kernel waiting 2 minutes on TASK_UNINTERRUPTIBLE is certainly
>>> broken.
>> What should it do when the NFS server doesn't answer anymore or 
>> when the network to the SAN RAID array located a few hundred KM away
>> develops some hickup?  Or just the SCSI driver decides to do lengthy
>> error recovery  -- you could argue that is broken if it takes longer 
>> than 2 minutes, but in practice these things are hard to test
>> and to fix.
>>
> 
> the scsi layer will have the IO totally aborted within that time anyway;
> the retry timeout for disks is 30 seconds after all.
..

Mmm.. but the SCSI layer may do many retries, each with 30sec timeouts..
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