netdev - Re: Linux 3.1-rc9

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Message-ID: <20111103001721.GK5971@hostway.ca>
Date:	Wed, 2 Nov 2011 17:17:21 -0700
From:	Simon Kirby <sim@...tway.ca>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	David Miller <davem@...emloft.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Ingo Molnar <mingo@...e.hu>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: Linux 3.1-rc9

On Wed, Nov 02, 2011 at 08:15:51PM -0400, Steven Rostedt wrote:

> On Wed, 2011-11-02 at 17:09 -0700, Simon Kirby wrote:
> >  
> > [   49.032008] other info that might help us debug this:
> > [   49.032008] 
> > [   49.032008]  Possible unsafe locking scenario:
> > [   49.032008] 
> > [   49.032008]        CPU0                    CPU1
> > [   49.032008]        ----                    ----
> > [   49.032008]   lock(slock-AF_INET);
> > [   49.039565]                                lock(slock-AF_INET/1);
> > [   49.039565]                                lock(slock-AF_INET);
> > [   49.039565]   lock(slock-AF_INET/1);
> > [   49.039565] 
> > [   49.039565]  *** DEADLOCK ***
> > [   49.039565] 
> 
> > Did that help? I'm not sure if that's what you wanted to see...
> 
> 
> Yes, this looks much better than what you previously showed. The added
> "/1" makes a world of difference.
> 
> Thanks!
> 
> I'll add your "Tested-by". Seems rather strange as we didn't fix the bug
> you are chasing, but instead fixed the output of what the bug
> produced ;)

Well, I was testing this without Eric's patch as I figured you wanted to
see the splat. :) Testing again with Eric's patch now.

Simon-
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