Re: new warning at net/wireless/util.c:1236

From: Kalle Valo
Date: Thu May 04 2017 - 00:36:00 EST

Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> writes:

> So my Dell XPS 13 seems to have grown a new warning as of the
> networking merge yesterday.
> Things still work, but when it starts warning, it generates a *lot* of
> noise (I got 36 of these within about ten minutes).
> I have no idea what triggered it, because when I rebooted (not because
> of this issue, but just to reboot into a newer kernel) I don't see it
> again.
> This is all pretty regular wireless - it's intel 8260 wireless in a
> fairly normal laptop.
> Things still seem to *work* ok, so the only problem here is the overly
> verbose and useless WARN_ON. It doesn't even print out *which* rate it
> is warning about, it just does that stupid unconditional WARN_ON()
> without ever shutting up about it..
> The WARN_ON() seems to be old, but my logs don't seem to have any
> mention of this until today, so there's something that has changed
> that now triggers it.
> Ideas?
> Linus
> ---
> WARNING: CPU: 3 PID: 1138 at net/wireless/util.c:1236
> cfg80211_calculate_bitrate+0x139/0x170 [cfg80211]

As this is with iwlwifi adding also Luca. There were some rate handling
changes in iwlwifi, like commit 77e409455f41, but don't know if that
could cause this.

Kalle Valo