Re: Soft-Lockup/Race in networking in 2.6.31-rc1+195 (possibly causedby netem)

[Andres Freund]

On 07/02/2009 01:11 PM, Andres Freund wrote:
> On 07/02/2009 12:12 PM, Jarek Poplawski wrote:
> > On Thu, Jul 02, 2009 at 09:30:31AM +0000, Jarek Poplawski wrote:
> > > On Thu, Jul 02, 2009 at 02:37:24AM +0200, Andres Freund wrote:
> > > ...
> > > > So I tried - and I did not catch any lockdep output before the crash.
> > > > Unfortunately I do not have another machine on the same local
> > > > network to
> > > > catch any messages after the crash... So I could be missing some
> > > > warning
> > > > (I did synchronous logging though).
> > > > Will check with netconsole tomorrow.
> > >
> > > Could you try if this patch changes anything?
> >
> > ...and maybe CONFIG_PACKET_MMAP turned off.
> Ok. Removed the skb_orphan and turned of CONFIG_PACKET_MMAP. Seemingly
> the same game.
> I now had another computer to catch the netconsole output. Still no
> lockdep warnings.
>
> Unfortunately the other computer was a windows machine with its strange
> terminal, so long lines are wrapped at 80cols, but that shouldn't be too
> bad.
I will start trying to place the issue by testing with existing kernels 
between 2.6.30 and now.

Andres
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