linux-kernel - Re: Asterisk deadlocks since Kernel 4.1

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Message-Id: <1448283451.4019628.447573353.3659E447@webmail.messagingengine.com>
Date:	Mon, 23 Nov 2015 13:57:31 +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 Mon, Nov 23, 2015, at 13:44, Stefan Priebe - Profihost AG wrote:
> Am 19.11.2015 um 20:51 schrieb Stefan Priebe:
> > 
> > Am 19.11.2015 um 14:19 schrieb Florian Weimer:
> >> On 11/19/2015 01:46 PM, Stefan Priebe - Profihost AG wrote:
> >>
> >>> I can try Kernel 4.4-rc1 next week. Or something else?
> >>
> >> I found this bug report which indicates that 4.1.10 works:
> >>
> >>    <https://issues.asterisk.org/jira/browse/ASTERISK-25251>
> >>
> >> But in your original report, you said that 4.1.13 is broken.
> > 
> > That's correct i'm running 4.1.13.
> > 
> >> This backtrace:
> >>
> >>    <https://issues.asterisk.org/jira/secure/attachment/52702/bt.txt>
> >>
> >> shows a lot of waiting on quite different netlink sockets.  So if this
> >> is due to a race in Asterisk, it must have happened several times in a
> >> row.
> 
> Kernel 4.4-rc2 works fine. How can we grab / get an idea which is
> causing the isse in 4.1? It's an LTE kernel so it should be fixed!

Thanks for testing. I was not able to reproduce it at all, with as much
parallelism and threads as possible on any kernel. Could you try to do a
git bisect?

Thanks,
Hannes
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