netdev - Re: 2.6.35->2.6.36 regression, vanilla kernel panic, ppp or hrtimers crashing

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Message-Id: <201011030947.54464.nuclearcat@nuclearcat.com>
Date:	Wed, 3 Nov 2010 09:47:53 +0200
From:	Denys Fedoryshchenko <nuclearcat@...learcat.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: 2.6.35->2.6.36 regression, vanilla kernel panic, ppp or hrtimers crashing

I try to reverse and got very weird lockups (no netconsole logs and no 
watchdog triggered reboot on that remote machine).
I will try to cook something to reboot it, because it is very remote machine

On Wednesday 03 November 2010 09:38:54 Jarek Poplawski wrote:
> On Tue, Nov 02, 2010 at 03:49:47PM +0200, Denys Fedoryshchenko wrote:
> > I didn't try yet, but i enable more debugs and catch linked list
> > corruption.
> 
> It should be very useful but it seems there were no significant changes
> in ppp locking between 2.6.35 and .36 except the patch I mentioned, so
> it would be nice to check this first and try to fix it properly later.
> 
> Jarek P.
> 
> > Here is dumps from netconsole:
> > http://www.nuclearcat.com/ll.txt
> > http://www.nuclearcat.com/ll2.txt
> > 
> > I have another PC, also fails to run 2.6.36, but netconsole don't give
> > anything.
> > Both PC's have strange issue with clock drifting away too much (on 2.6.35
> > and maybe even before).
> > 
> > On Thursday 28 October 2010 10:05:50 Jarek Poplawski wrote:
> > > On 2010-10-25 11:22, Denys Fedoryshchenko wrote:
> > > > Hi
> > > > 
> > > > Here is what i got from netconsole
> > > > 
> > > >  [  259.238755] BUG: unable to handle kernel
> > > >  paging request
> > > >  at f8ba001c9999
> > > >  [  259.238953] IP:
> > > >  [<c0199ebe>] do_select+0x2cc/0x502
> > > 
> > > ...
> > > 
> > > > It is not easy to do full git bisect(it is semi-embedded distro), but
> > > > i can try reversing particular commits, if someone can give idea
> > > > which one, and can try debug patches.
> > > 
> > > Hi,
> > > Nothing concrete, but you might try reverting this one:
> > > 
> > > http://git.kernel.org/?p=linux/kernel/git/stable/linux-2.6.36.y.git;a=c
> > > ommi tdiff;h=15fd0cd9a2ad24a78fbee369dec8ca660979d57e
> > > 
> > > Jarek P.
> > > --
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