[B.A.T.M.A.N.] Kernel crashes when using more than one interface in bat0

Matthias Schiffer mschiffer at universe-factory.net
Thu Aug 20 13:10:46 CEST 2015


On 08/20/2015 12:08 PM, Hans-Werner Hilse wrote:
> Hi,
> 
> Am 2015-08-18 18:35, schrieb Bjoern Franke:
> 
>> 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
> 
> 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:
> 
> - first and foremost, we were using the outdated legacy 2013.4 version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.
> 
> So I blamed a buggy RCU implementation in older kernels, plus maybe some
> ill behaviour in the old batman-adv codebase. The crashing kernel was
> the old debian-wheezy one - pretty old, I'd say.
> 
> -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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