[Bug 280546] iwlwifi panic in BT COEX code

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=280546

--- Comment #15 from Bjoern A. Zeeb <bz@FreeBSD.org> ---
(In reply to Robin Haberkorn from comment #14)

Hi Robin,

thanks a lot for going the full way of finding a reproducer.
That should also make it easier here to go and see about it if it works equally
well in my setup.

I've got this on the radar but there's only so much fish I can fry a days too
;-)  If you find patching your iwlwifi with extra NULL pointer checks help
it'll be good.  It might still be that it'll just make it harder to his a race
against something else but in the end everything will help at the moment.

What would be interesting to know if you can panic this reliably and have the
opportunity to further debug is what happens on the other CPUs at that time so
we could identify the case we are racing against.

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