linux-kernel - Re: 2.6.30-rc8 Oops whilst booting

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Message-ID: <4A2D4C6E.6080108@linux.intel.com>
Date:	Mon, 08 Jun 2009 10:37:50 -0700
From:	Arjan van de Ven <arjan@...ux.intel.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	James Bottomley <James.Bottomley@...senPartnership.com>,
	Chris Clayton <chris2553@...glemail.com>,
	Jaswinder Singh Rajput <jaswinder@...nel.org>,
	NeilBrown <neilb@...e.de>, linux-kernel@...r.kernel.org,
	scsi <linux-scsi@...r.kernel.org>, Tejun Heo <tj@...nel.org>
Subject: Re: 2.6.30-rc8 Oops whilst booting

Linus Torvalds wrote:
> 
> On Mon, 8 Jun 2009, James Bottomley wrote:
>> The root cause is a reordering of the devices caused by the async code.
> 
> That's NULL information.
> 
> OF COURSE the root cause is the async code. We know that. We're looking 
> for the specifics.
> 
> In particular, before that commit, at most you will wait for too _much_. 
> In other words, it's a "good" wait. 
> 
> Your commit caused it to wait for less, and that then showed a bug. Not 
> all that surprising - it's now not waiting enough.
> 
> You tried to avoid a deadlock situation of waiting for too much, but you 
> avoided the deadlock by now waiting for too little. 
> 
> I also think that your code is simply buggy. As far as I can tell, int he 
> case of having both running and pending events, you'll always pick the 
> pending cookie. But it's the _running_ cookie that has the lower event 
> number, isn't it?
> 
> I dunno. It all looks very fishy to me.
> 

that's likely my screwup, not james'

the patch looks ok to me, it indeed should fix the problem.
(and is simpler than the idea I had around using min() )
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