Re: Cpu stall caused by hostapd running two interfaces

[Stanislaw Gruszka <sgruszka@redhat.com>]

On Mon, Aug 13, 2018 at 03:03:56PM +0300, Kalle Valo wrote:
> Stanislaw Gruszka <sgruszka@redhat.com> writes:
> 
> > (cc Haim and Johannes)
> >
> > On Sun, Aug 12, 2018 at 09:54:00PM +0200, Grzegorz Duszyński wrote:
> >> Hello,
> >> 
> >> I'm running into problems while trying to start AP's on 2 interfaces.
> >> Devices are:
> >> - Compex WLE900VX (QCA9880)
> >> - Killer 1535 (QCA6174)
> >> 
> >> The 1535 is a new addition to the system.
> >> Compex by itself runs fine, Killer also can run alone.
> >> 
> >> But when running them together all hell breaks lose.
> >> System is unusable, cannot even reboot.
> >> 
> >> I'm running Arch Linux.
> >> My system was updated before testing & posting.
> >> 
> >> Attachments:
> >> dmesg - https://pastebin.com/wf3Fq8gh
> >> 
> >> Please let me know if additional info is required.
> >
> > This is oops in ieee80211_regulatory_limit_wmm_params().
> > Looks like new regulatory code do not like ath10k.
> > I have another bug report with reg.c WARNING also on ath10k:
> > https://bugzilla.redhat.com/show_bug.cgi?id=1612537
> 
> I think bug #1612537 is with ath9k, not ath10k. But anyway, both use
> ath.ko which has some custom regulatory code.

Actually warning from #1612537 is not driver depended. It can be
reproduced just by loading cfg80211 with ieee80211_regdom parameter,
for example:

sudo modprobe cfg80211 ieee80211_regdom=AQ

Regards
Stanislaw