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

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  new warning at net/wireless/util.c:1236 Linus Torvalds <torvalds@linux-foundation.org> - 2017-05-04 04:30 +0200
    Re: new warning at net/wireless/util.c:1236 Kalle Valo <kvalo@codeaurora.org> - 2017-05-04 06:40 +0200
      Re: new warning at net/wireless/util.c:1236 "Coelho, Luciano" <luciano.coelho@intel.com> - 2017-05-04 08:10 +0200
    Re: new warning at net/wireless/util.c:1236 Johannes Berg <johannes@sipsolutions.net> - 2017-05-04 08:50 +0200

#1635376 — new warning at net/wireless/util.c:1236

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]
Modules linked in: rfcomm fuse ccm ip6t_rpfilter ip6t_REJECT
nf_reject_ipv6 xt_conntrack ip_set nfnetlink ebtable_broute bridge stp
llc ebtable_nat ip6table_security ip6table_mangle ip6table_nat nf_con
 snd_hda_codec iwlmvm irqbypass snd_hwdep snd_hda_core intel_cstate
mac80211 snd_seq intel_rapl_perf snd_seq_device snd_pcm iwlwifi
rtsx_pci_ms snd_timer cfg80211 memstick snd soundcore i2c_i801 shpchp
 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt
fb_sys_fops drm i2c_hid video
CPU: 3 PID: 1138 Comm: NetworkManager Tainted: G        W
4.11.0-06543-g2f34c1231bfc #60
Hardware name: Dell Inc. XPS 13 9350/09JHRY, BIOS 1.4.13 12/28/2016
task: ffff9c1d1bfcbb80 task.stack: ffffbb95c337c000
RIP: 0010:cfg80211_calculate_bitrate+0x139/0x170 [cfg80211]
RSP: 0018:ffffbb95c337f5b8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff9c1cb080cc00 RCX: 0000000000000000
RDX: 0000000000000005 RSI: 0000000000000002 RDI: ffffbb95c337f76e
RBP: ffffbb95c337f5b8 R08: 0000000000000004 R09: ffff9c1cc36fe0c4
R10: 00000000f7c00472 R11: ffffffffc0682000 R12: ffff9c1cc36fe0c0
R13: ffffbb95c337f76e R14: 0000000000000000 R15: ffff9c1cc36fe030
FS:  00007f000015f980(0000) GS:ffff9c1d3ed80000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd1ae62748 CR3: 0000000469f4f000 CR4: 00000000003406e0
Call Trace:
 nl80211_put_sta_rate+0x56/0x210 [cfg80211]
 nl80211_send_station.isra.63+0x639/0xd60 [cfg80211]
 nl80211_get_station+0x1e4/0x250 [cfg80211]
 genl_family_rcv_msg+0x1fa/0x3e0
 genl_rcv_msg+0x4c/0x90
 netlink_rcv_skb+0xde/0x110
 genl_rcv+0x28/0x40
 netlink_unicast+0x189/0x220
 netlink_sendmsg+0x2ba/0x3b0
 sock_sendmsg+0x38/0x50
 ___sys_sendmsg+0x2b6/0x2d0
 __sys_sendmsg+0x54/0x90
 SyS_sendmsg+0x12/0x20
 entry_SYSCALL_64_fastpath+0x13/0x94
RIP: 0033:0x7efffebf82fd
RSP: 002b:00007fff97d4af30 EFLAGS: 00000293 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efffebf82fd
RDX: 0000000000000000 RSI: 00007fff97d4afc0 RDI: 0000000000000010
RBP: 00007fff97d4b070 R08: 0000000000000000 R09: 00007efffcc7b168
R10: 000055eb69e6d110 R11: 0000000000000293 R12: 00007fff97d4b0e0
R13: 0000000000000001 R14: 0000000000000000 R15: 000055eb68a32760
Code: 89 d0 f7 e1 d1 ea 8d 14 92 01 d2 81 c2 50 c3 00 00 b9 c5 5a 7c
0a c1 ea 05 89 d0 f7 e1 5d 89 d0 c1 e8 07 c3 31 c0 80 f9 02 74 b7 <0f>
ff 31 c0 eb b1 0f ff 31 c0 5d c3 0f ff 31 c0 5d c3 8d 04 40

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#1635407

Linus Torvalds <torvalds@linux-foundation.org> 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

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#1635424

On Thu, 2017-05-04 at 07:35 +0300, Kalle Valo wrote:
> Linus Torvalds <torvalds@linux-foundation.org> 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.

Thanks Kalle.  I don't see anything in the iwlwifi driver that could be
causing this.  Johannes suspects some RX rate changes he made in
mac80211...

--
Luca.

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#1635437

Hi,

> Things still work, but when it starts warning, it generates a *lot*
> of noise (I got 36 of these within about ten minutes).

Yeah, that's kinda dumb - I just sent a patch to make that just warn
once and actually report the configuration.

> 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.

That's odd. Perhaps you connected to a different wireless network on
the next boot? I'm pretty sure I found the cause for this, and will
send out a patch in a minute, but that wouldn't go away with a
different kernel.

johannes

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