On Wednesday 03 February 2016 16:41:30 Johannes Berg wrote: > On Wed, 2016-02-03 at 10:26 -0500, Josh Boyer wrote: > > On Wed, Feb 3, 2016 at 10:24 AM, Josh Boyer <jwboyer@xxxxxxxxxxxxxxxx > > g> wrote: > > > Hi All, > > > > > > We've had a user report the backtrace below when loading batman-adv > > > on > > > his machine. It looks like the cfg80211 layer is complaining about > > > a > > > null bss returned, but I cannot tell if the rtlwifi driver or > > > batman-adv is in error here. > > > > > > Thoughts? > > > > Sorry, forgot to include the link to the actual bug report: > > > > https://bugzilla.redhat.com/show_bug.cgi?id=1304428 > > > > Reporter says this is new with 4.3.y and did not happen on e.g. > > 4.2.8. > > > > AFAICT this should be a driver (or perhaps mac80211) issue, but I don't > see any information about the driver used. It doesn't really look like it is batman-adv specific. batman-adv also doesn't be active because the message "batman_adv: bat0: Adding interface: " is missing. batman-adv is also not responsible for the underlying device. So it will not join IBSS and thus should not trigger the "wlp0s26u1u4: Selected IBSS BSSID" seen in the log. But that said, I already saw weirder things happen because of memory corruptions. So I will not say that batman-adv cannot be the culprit but right now I don't see how. The user can also try (when he thinks that batman-adv is to blame) to bisect the batman-adv versions via the git of the out-of-tree module [1]. The version [2] from 4.1 should be roughly v2015.0 (b6ff92aa334083dee8a1f5f0c5aa0f7c4c2584cf), v4.2 should be v2015.1 (95b64b1cef38340f48f4eba99689e0fb1feddcd0) and v4.3 should not be newer than v2015.2 (e25bd38b0f8b4aeca85ef24884fa5eadd6270709). So bisecting between b6ff92aa334083dee8a1f5f0c5aa0f7c4c2584cf and e25bd38b0f8b4aeca85ef24884fa5eadd6270709 (~6 steps) should cover it. I personally would recommend to start on 4.2.8 with v2015.2 (e25bd38b0f8b4aeca85ef24884fa5eadd6270709) Kind regards, Sven [1] https://git.open-mesh.org/batman-adv.git [2] https://www.open-mesh.org/projects/open-mesh/wiki/Download#batman-adv-in-the-Linux-tree
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