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Date: Wed, 02 Dec 2015 18:15:18 +0100
From: Philipp Hahn <pmhahn@pmhahn.de>
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To: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>,
	Hannes Frederic Sowa <hannes@stressinduktion.org>,
	Florian Weimer <fweimer@redhat.com>
CC: Thomas Gleixner <tglx@linutronix.de>, netdev@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	herbert@gondor.apana.org.au
Subject: Re: Asterisk deadlocks since Kernel 4.1
References: <564B3D35.50004@profihost.ag> <alpine.DEB.2.11.1511171936030.3761@nanos> <564B7F9D.5060701@profihost.ag> <alpine.DEB.2.11.1511172041480.3761@nanos> <564CDE2F.8000201@profihost.ag> <564CEB0C.40006@redhat.com> <564CEF5D.3080005@profihost.ag> <564D9A17.6080305@redhat.com> <564D9B21.302@profihost.ag> <564D9CE6.2090104@profihost.ag> <1447933294.1974772.444210441.67F1AC5E@webmail.messagingengine.com> <564DB5F5.9060208@profihost.ag> <1447936902.1986892.444251921.3928A049@webmail.messagingengine.com> <564DC4A5.70104@profihost.ag> <564DCC4C.1090009@redhat.com> <564E2852.8000200@profihost.ag> <56530A42.6030609@profihost.ag> <1448283451.4019628.447573353.3659E447@webmail.messagingengine.com> <565EBDC1.1090808@profihost.ag>
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Hi,

Am 02.12.2015 um 10:45 schrieb Stefan Priebe - Profihost AG:
> here are the results.
> 
> It works with 4.1.
> It works with 4.2.
> It does not work with 4.1.13.

the patches were first commitet in v4.3-rc3 and appear as backports only
since v4.2.3 and v4.1.10

> git bisect tells me it stopped working after those two commits were applied:
> 
> commit d48623677191e0f035d7afd344f92cf880b01f8e
> Author: Herbert Xu <herbert@gondor.apana.org.au>
> Date:   Tue Sep 22 11:38:56 2015 +0800
> 
>     netlink: Replace rhash_portid with bound
> 
> commit 4e27762417669cb459971635be550eb7b5598286
> Author: Herbert Xu <herbert@gondor.apana.org.au>
> Date:   Fri Sep 18 19:16:50 2015 +0800
> 
>     netlink: Fix autobind race condition that leads to zero port ID

I identified the same two patches for our prpblem; see mail from
2015-11-17 16:53 with subject "Strange PF_NETLINK NETLINK_ROUTE stall:
netlink: Fix autobind race condition that leads to zero port ID"

<http://marc.info/?l=linux-kernel&m=144863837825887&w=2>

Philipp