linux-kernel - Re: Asterisk deadlocks since Kernel 4.1

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Date:	Thu, 19 Nov 2015 13:41:42 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	"Stefan Priebe - Profihost AG" <s.priebe@...fihost.ag>,
	Florian Weimer <fweimer@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, netdev@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Asterisk deadlocks since Kernel 4.1

On Thu, Nov 19, 2015, at 12:43, Stefan Priebe - Profihost AG wrote:
> 
> Am 19.11.2015 um 12:41 schrieb Hannes Frederic Sowa:
> > On Thu, Nov 19, 2015, at 10:56, Stefan Priebe - Profihost AG wrote:
> >> OK it had a livelock again. It just took more time.
> >>
> >> So here is the data:
> > 
> > Thanks, I couldn't reproduce it so far with simple threaded resolver
> > loop on your kernel. :/
> > 
> > Your data is useless if you don't also provide the file descriptor which
> > you are blocking on right now. ;)
> > 
> > Thanks,
> > Hannes
> 
> ah sorry. So we need the gdb backtrace with the rcvmsg and then the fd
> list + netlink list?

Yes, albeit the probability we find something new is minimal. We already
know it blocks deep down in netlink code. I tried to reproduce it in
multithreaded environment with no results so far. Can you even try a
newer kernel?

Bye,
Hannes
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