Kernel panic hosting 5Ghz AP

Kalle Valo kvalo at
Sun Nov 26 22:21:47 PST 2017

Konstantin Bogomolov <konstantin.bogomolov at> writes:

> Hello Kalle,
> The panic happens after hostapd outputs "ACS-STARTED". Usually, the
> first attempt for me to start hostapd fails to create the AP (I think
> this is a separate issue with the 5Ghz AP), but the second attempt
> always initiates a panic on Debian 4.9 drivers.
> I don't think this is a regression, because I saw the same behaviour
> on a custom 4.1 kernel. I have also tried using backported drivers
> from 4.12.0 to both 4.1 and 4.9, where the panic was also reproducible
> on the second hostapd attempt, but didn't happen every time as it does
> on Debian 4.9. So the AP did work on some occasions using the
> backports, but the panic still happened very frequently. Sadly I don't
> have logs at this time using those backports.
> I'll try and reproduce this using a recent kernel and let you know the results.

Also try without ACS (meaning specify a channel mannually hostapd config
file) just to see if the crash is ACS related.

Kalle Valo

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