Dear Maintainer,

   * What are you trying to do?

I'm trying to scan networks in a place where two cells on 2.4Ghz and 5Gz have
the same SSID.

   * What was the outcome of this action?

The scan returns only one cell (not the one with double frequency, a third
one), and subsequent scan return nothing. It seems that the scan itself somehow
crashes.

   * What outcome did you expect instead?

The scan would return all cells.

   * What's a potential explanation?

Somewhere in the stack, there is a confusion regarding having the same SSID in
both the 2.4Ghz and 5Gz frequency range.

Best regards,

Martin Monperrus wrote on 09/06/2019:

Thanks for your report. I can't reproduce the problem locally, but I
have no reason to doubt of what you observed. However I think you are
correct saying "somewhere in the stack": I doubt iw(1) is to blame here,
as it merely reports the results of the scan. While this means this bug
report should probably be against the kernel, and it's probably an
upstream bug, I have nothing against tracking the issue here.

Paride

Hi Paride,

Thanks for your answer. Would you recommend to report it on https://bugzilla.kernel.org/?

Martin Monperrus wrote on 14/06/2019:

Hi Martin,

I'd say the bug belongs there, but keep in mind that for your report to
be considered I think you'll be asked to compile the latest version of
the vanilla kernel.

IF your WiFi adapter needs a firmware it may be worth trying to use the
latest version released by the manufacturer.

Paride

Thanks Paride for the advice.

Hi,

If you do end up reporting this upstream, please make sure you indicate
the driver that's being used - this is highly unusual behaviour and for
most drivers that correctly use cfg80211 it shouldn't even be possible
to end up with this behaviour.

johannes