Bug 89001

Summary:	iwlwifi dvm: WARNING - reg_process_hint: net/wireless/reg.c:1806 - MWG100223400
Product:	Drivers	Reporter:	AS (aaron.soehnen)
Component:	network-wireless	Assignee:	drivers_network-wireless (drivers_network-wireless)
Status:	CLOSED CODE_FIX
Severity:	normal	CC:	devkid, ilw, linville, tigrangab, yuv.adm
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.17.4-1-ARCH	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	dmesg log of error another dmesg log

Description AS 2014-11-28 16:32:17 UTC

Created attachment 159021 [details]
dmesg log of error

When I connect to a wireless network, I get a crash on the iwlwifi module almost every time. This also happens irregularly while I'm already connected to a wireless LAN.
Additionally I sometimes get "fail to flush tx queue" errors, but far less frequently. Latter error seems to be the same as reported here: https://bugzilla.kernel.org/show_bug.cgi?id=56581

Every time 1 second before the crash, this line gets logged:
cfg80211: Calling CRDA for country: DE
Not sure if that's related.

I'm using a Thinkpad x220 with an "Intel Corporation Centrino Advanced-N 6205" wireless controller.

There is also an entry on the Arch Linux bugtracker with additional logs and information: https://bugs.archlinux.org/task/41906

Comment 1 Emmanuel Grumbach 2014-11-29 20:08:42 UTC

I'll check the regulatory thing - but that's in mac80211. I don't remember right now if we have a fix for this.

Regarding "fail to flush tx queue", the fix has been merged in 3.17.3 upstream. I don't know how that maps to ARCH linux kernels but I'd be very surprised if 3.17.4-1-ARCH wouldn't have that commit...

In any case, unfortunately, there isn't much more I can do for that bug.

Comment 2 Yuval Adam 2014-11-30 18:03:37 UTC

Same error here on a system with this wireless device:

    01:00.0 Network controller: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter (rev 01)

Attaching relevant dmesg log.

Comment 3 Yuval Adam 2014-11-30 18:04:11 UTC

Created attachment 159221 [details]
another dmesg log

Comment 4 Emmanuel Grumbach 2014-12-02 07:59:25 UTC

Patch published:
https://patchwork.kernel.org/patch/5417441/

I am leaving this bug open until the patch gets merged.

Comment 5 Alfred Krohmer 2014-12-02 12:39:57 UTC

If I unterstand your patch correctly it just removes the warning, but it won't actually fix the driver crash this bug report was submitted for. So why mark it as resolved?

Comment 6 Emmanuel Grumbach 2014-12-02 13:45:05 UTC

There is no real bug. The commit message explains this.

Comment 7 Emmanuel Grumbach 2014-12-02 20:23:57 UTC

FYI - this patch has been ACKed by the maintainer of the relevant code.

Comment 8 Emmanuel Grumbach 2014-12-12 12:43:12 UTC

patch was applied.