netdev - Re: BNX2: Kernel crashes with 2.6.31 and 2.6.31.9

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Date:	Thu, 11 Mar 2010 10:38:58 -0800
From:	"Michael Chan" <mchan@...adcom.com>
To:	"David Miller" <davem@...emloft.net>
cc:	"brian.haley@...com" <brian.haley@...com>,
	"bonbons@...ux-vserver.org" <bonbons@...ux-vserver.org>,
	"Benjamin Li" <benli@...adcom.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: BNX2: Kernel crashes with 2.6.31 and 2.6.31.9


On Thu, 2010-03-11 at 10:05 -0800, David Miller wrote:
> From: "Michael Chan" <mchan@...adcom.com>
> Date: Thu, 11 Mar 2010 09:49:56 -0800
> 
> > 
> > On Wed, 2010-03-10 at 18:09 -0800, Brian Haley wrote:
> >> >> I'm able to cause a netdev_watchdog timeout by changing the coalesce
> >> >> settings on my bnx2, I built a little test program for it:
> >> > 
> >> > Do you run this program in a loop?  How quickly do you see the NETDEV
> >> > WATCHDOG?
> >> 
> >> It's run once, and we see it almost immediately after ETHTOOL_SCOALESCE.
> > 
> > What's the difference between running the test program and doing ethtool
> > -C?  Do you see the issue in either case?  I don't see the issue here
> > with ethtool -C.
> 
> Probably because the independent program runs faster and thus
> can trigger races more easily.
> 

That's what I thought, I thought he was running it in a loop and
triggering some race condition.  But he said he only ran it once.  His
program gets the coalesce settings, sleeps for 5 seconds, and then sets
the coalesce settings.

> In any case, you should be trying to reproduce his problem with
> his test program since he went through the effort of providing
> one.
> 

I just tried it and cannot reproduce the problem.

Brian, please provide more information.  Thanks.


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