Bug 89001

Summary: iwlwifi dvm: WARNING - reg_process_hint: net/wireless/reg.c:1806 - MWG100223400
Product: Drivers Reporter: AS (aaron.soehnen)
Component: network-wirelessAssignee: drivers_network-wireless (drivers_network-wireless)
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:

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.