on my laptop, when I do ifup wlan0
, sometimes I get following call trace in dmesg
. Other times, the log looks perfectly normal, and there are no kernel Oops
messages.
In both cases (with errors and without), my network seems to work fine.
But I would like to understand what is happening. Could somebody please help me interpret the meaning of the call trace messages ?
kernel: [181794.747548] ------------[ cut here ]------------
kernel: [181794.747560] WARNING: CPU: 2 PID: 8430 at net/wireless/reg.c:1806 0xffffffff8147a677()
kernel: [181794.747570] CPU: 2 PID: 8430 Comm: kworker/2:0 Tainted: G W 3.16.6 #1
kernel: [181794.747574] Hardware name: Dell Inc. Latitude E7440/03HFCG, BIOS A09 05/01/2014
kernel: [181794.747579] Workqueue: events 0xffffffff8147a740
kernel: [181794.747584] 0000000000000000 0000000000000009 ffffffff814c43fb 0000000000000000
kernel: [181794.747592] ffffffff81058185 0000000000011500 ffffffff8147a677 ffff88040d4cb300
kernel: [181794.747598] ffff8804082e7e00 0000000000000003 ffff88040d440240 ffff8804082e7e00
kernel: [181794.747605] Call Trace:
kernel: [181794.747611] [<ffffffff814c43fb>] ? 0xffffffff814c43fb
kernel: [181794.747615] [<ffffffff81058185>] ? 0xffffffff81058185
kernel: [181794.747619] [<ffffffff8147a677>] ? 0xffffffff8147a677
kernel: [181794.747623] [<ffffffff8147a677>] ? 0xffffffff8147a677
kernel: [181794.747627] [<ffffffff8147a7ae>] ? 0xffffffff8147a7ae
kernel: [181794.747630] [<ffffffff81067c27>] ? 0xffffffff81067c27
kernel: [181794.747634] [<ffffffff8106806f>] ? 0xffffffff8106806f
kernel: [181794.747638] [<ffffffff81067d7d>] ? 0xffffffff81067d7d
kernel: [181794.747642] [<ffffffff8106cc2d>] ? 0xffffffff8106cc2d
kernel: [181794.747645] [<ffffffff8106cb68>] ? 0xffffffff8106cb68
kernel: [181794.747649] [<ffffffff814cb16c>] ? 0xffffffff814cb16c
kernel: [181794.747653] [<ffffffff8106cb68>] ? 0xffffffff8106cb68
kernel: [181794.747657] ---[ end trace 269bc2d623c15a61 ]---
kernel: [181794.747661] cfg80211: Calling CRDA for country: DE
kernel: [181794.790714] CPU: 2 PID: 8430 Comm: kworker/2:0 Tainted: G W 3.16.6 #1
kernel: [181794.790717] Hardware name: Dell Inc. Latitude E7440/03HFCG, BIOS A09 05/01/2014
kernel: [181794.790720] Workqueue: events 0xffffffff8147a740
kernel: [181794.790723] 0000000000000000 0000000000000009 ffffffff814c43fb 0000000000000000
kernel: [181794.790728] ffffffff81058185 0000000000011500 ffffffff8147a677 ffff88040d4cb300
kernel: [181794.790732] ffff8804082e7e00 0000000000000003 ffff88040d440240 ffff8804082e7e00
kernel: [181794.790736] Call Trace:
kernel: [181794.790740] [<ffffffff814c43fb>] ? 0xffffffff814c43fb
kernel: [181794.790743] [<ffffffff81058185>] ? 0xffffffff81058185
kernel: [181794.790745] [<ffffffff8147a677>] ? 0xffffffff8147a677
kernel: [181794.790747] [<ffffffff8147a677>] ? 0xffffffff8147a677
kernel: [181794.790750] [<ffffffff8147a7ae>] ? 0xffffffff8147a7ae
kernel: [181794.790752] [<ffffffff81067c27>] ? 0xffffffff81067c27
kernel: [181794.790754] [<ffffffff8106806f>] ? 0xffffffff8106806f
kernel: [181794.790757] [<ffffffff81067d7d>] ? 0xffffffff81067d7d
kernel: [181794.790759] [<ffffffff8106cc2d>] ? 0xffffffff8106cc2d
kernel: [181794.790761] [<ffffffff8106cb68>] ? 0xffffffff8106cb68
kernel: [181794.790763] [<ffffffff814cb16c>] ? 0xffffffff814cb16c
kernel: [181794.790766] [<ffffffff8106cb68>] ? 0xffffffff8106cb68
kernel: [181794.790768] ---[ end trace 269bc2d623c15a62 ]---
kernel: [181794.790771] cfg80211: Calling CRDA for country: DE
kernel: [181794.972483] ------------[ cut here ]------------
For completion, I might add that this is a new laptop, but I have replaced the original wifi card (Intel Dualband Wireless-AC 7260) with my own card (Intel Centrino Ultimate-N 6300)
I am using Debian Wheezy with my own kernel 3.16.6
Two consecutive Country IE hints on the same wiphy. This should be picked up early by the driver/stack