linux-kernel - Re: [PATCH] [scsi]: Add offline state checking while dispatch a scsi cmd

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Date:	Mon, 12 Mar 2007 09:03:02 +0800
From:	Joe Jin <joe.jin@...cle.com>
To:	James Bottomley <James.Bottomley@...elEye.com>
Cc:	Joe Jin <joe.jin@...cle.com>, akpm@...l.org, dgilbert@...erlog.com,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	haobo.zhou@...cle.com
Subject: Re: [PATCH] [scsi]: Add offline state checking while dispatch a scsi cmd

> 
> This is a bug actually in the megaraid.

Aha, I'll track it.

> 
> And this is a direct command submission path:  it already passed both
> online check gates in this path *after* the device was offlined, so
> adding a third won't fix this. 

Yeah, I have notice that, however, from the logs, the device have offline, 
but why still can send cmd to device? isn't the sequences of printk suspectful?

> single disk, so the I/O was definitely bound for sda?  Secondly, can you
> reproduce with a modern (2.6.20) kernel.  Your trace strongly suggests
> that the device came back online for some reason and then the megaraid
> driver died.

It's hard to update the kernel for the system is a production system, and we
cannot debug it at the box :( 

I dont know if you have notice, the logs come from diskdump, if it caused by
diskdump?

Thanks,
Joe
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