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From: Matthias Schiffer <mschiffer@universe-factory.net>
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Date: Thu, 20 Aug 2015 13:10:46 +0200
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Subject: Re: [B.A.T.M.A.N.] Kernel crashes when using more than one
 interface in bat0
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On 08/20/2015 12:08 PM, Hans-Werner Hilse wrote:
> Hi,
>=20
> Am 2015-08-18 18:35, schrieb Bjoern Franke:
>=20
>> Thanks for the hint, it did not work on the debian machines, but I got=

>> the systems running with crashkernel enabled. Now we got the first
>> crash:
>> https://p.rrbone.net/paste/nnNHrIJI#oHfBMOs2
>=20
> We've seen these on our Goettingen Freifunk gateways, too. There, too,
> batadv_frag_purge_orig was the smoking gun. However, I didn't report it=
,
> because:
>=20
> - first and foremost, we were using the outdated legacy 2013.4 version
> - it was most probably an issue with RCU lists
> - and either disabling SMP or using a much more current kernel fixed it=
=2E
>=20
> So I blamed a buggy RCU implementation in older kernels, plus maybe som=
e
> ill behaviour in the old batman-adv codebase. The crashing kernel was
> the old debian-wheezy one - pretty old, I'd say.
>=20
> -hwh

This is an independent bug (2013.4 uses a completely different
fragmentation implementation) that has been reported in
https://github.com/freifunk-gluon/batman-adv-legacy/issues/1 . Please
don't bother the upstream BATMAN developers with batman-adv-legacy bugs.

Matthias


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