lkml.org 
[lkml]   [2013]   [Oct]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [BUG bisected] WARNING: CPU: 0 PID: 1550 at net/wireless/chan.c:373 cfg80211_chandef_usable+0x30/0x15f()
Hey Dirk,

thanks a lot for your report. I have looked at your trace and the patch
again, but so far I'm not sure where the problem comes from. Could you
please help by providing:

* your wpa_supplicant config (censor your passwords!) - I guess you have
some ad-hoc networks configured?
* your wpa_supplicant command line parameters when running
* environment infos - are there IBSS networks next to your notebook?

From what I've seen so far:

* the following warning in cfg80211_chandef_usable() fails:

if (WARN_ON(!cfg80211_chandef_valid(chandef)))

* cfg80211_chandef_usable() is most probably called by
cfg80211_reg_can_beacon(), which is called from __ieee80211_sta_join_ibss()
* the worker appearently creates the IBSS network using ifibss->chandef,
which appearently turns out to be invalid.
* ifibss->chandef gets initialized from in ieee80211_ibss_join() from the upper
level parameters and is not changed later.
* at least nl80211 calls reg_can_bacon() as well and checks the chandef before
proceeding. wext looks ok too.

Therefore I'm not sure how the chandef gets broken ...

Thanks,
Simon

On Mon, Oct 21, 2013 at 02:09:40PM +0200, Dirk Gouders wrote:
> Hello Simon, all,
>
> Recently, I noticed many traces (find a sample attached) in situations
> when wpa_supplicant is running but no appropriate access-point available.
>
> I started a bisect and ended at commit 3aede78aad2a7e
> (mac80211: change IBSS channel state to chandef).
>
> Please let me know if you need more information to inspect this problem.
>
> Best regards,
>
> Dirk
>
> ------------------------------------------------------------------------
> Oct 21 13:56:06 lena kernel: ------------[ cut here ]------------
> Oct 21 13:56:06 lena kernel: WARNING: CPU: 0 PID: 1550 at net/wireless/chan.c:373 cfg80211_chandef_usable+0x30/0x15f()
> Oct 21 13:56:06 lena kernel: Modules linked in: brcmsmac cordic brcmutil bcma
> Oct 21 13:56:06 lena kernel: CPU: 0 PID: 1550 Comm: kworker/u4:5 Tainted: G W 3.12.0-rc6+ #20
> Oct 21 13:56:06 lena kernel: Hardware name: LENOVO 08946MG/MoutCook, BIOS 33CN14WW 05/10/2010
> Oct 21 13:56:06 lena kernel: Workqueue: phy0 ieee80211_iface_work
> Oct 21 13:56:06 lena kernel: 0000000000000000 0000000000000009 ffffffff8161e3c7 0000000000000000
> Oct 21 13:56:06 lena kernel: ffffffff81068b00 ffff88006f8be7c0 ffffffff815e79e4 0000000000000000
> Oct 21 13:56:06 lena kernel: 000000000000000f ffff8800703e5dc2 ffff8800703e5d50 ffff88006f8bc200
> Oct 21 13:56:06 lena kernel: Call Trace:
> Oct 21 13:56:06 lena kernel: [<ffffffff8161e3c7>] ? dump_stack+0x50/0x80
> Oct 21 13:56:06 lena kernel: [<ffffffff81068b00>] ? warn_slowpath_common+0x73/0x8b
> Oct 21 13:56:06 lena kernel: [<ffffffff815e79e4>] ? cfg80211_chandef_usable+0x30/0x15f
> Oct 21 13:56:06 lena kernel: [<ffffffff815e79e4>] ? cfg80211_chandef_usable+0x30/0x15f
> Oct 21 13:56:06 lena kernel: [<ffffffff815f7c2e>] ? __ieee80211_sta_join_ibss+0x162/0x6e2
> Oct 21 13:56:06 lena kernel: [<ffffffff8161b8cd>] ? printk+0x4f/0x54
> Oct 21 13:56:06 lena kernel: [<ffffffff815f8439>] ? ieee80211_sta_create_ibss+0xc8/0xce
> Oct 21 13:56:06 lena kernel: [<ffffffff815f91ed>] ? ieee80211_ibss_work+0x255/0x3c5
> Oct 21 13:56:06 lena kernel: [<ffffffff8107addb>] ? process_one_work+0x1c7/0x2e6
> Oct 21 13:56:06 lena kernel: [<ffffffff81078c58>] ? pwq_activate_delayed_work+0x1e/0x28
> Oct 21 13:56:06 lena kernel: [<ffffffff8107b346>] ? worker_thread+0x1cb/0x2c4
> Oct 21 13:56:06 lena kernel: [<ffffffff8107b17b>] ? rescuer_thread+0x25c/0x25c
> Oct 21 13:56:06 lena kernel: [<ffffffff8107ff37>] ? kthread+0xad/0xb5
> Oct 21 13:56:06 lena kernel: [<ffffffff81080000>] ? kthread_create_on_node+0xc1/0x115
> Oct 21 13:56:06 lena kernel: [<ffffffff8107fe8a>] ? kthread_freezable_should_stop+0x3b/0x3b
> Oct 21 13:56:06 lena kernel: [<ffffffff816247bc>] ? ret_from_fork+0x7c/0xb0
> Oct 21 13:56:06 lena kernel: [<ffffffff8107fe8a>] ? kthread_freezable_should_stop+0x3b/0x3b
> Oct 21 13:56:06 lena kernel: ---[ end trace ade89af8f1b5d90f ]---
> ------------------------------------------------------------------------
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2013-10-22 15:41    [W:0.081 / U:0.128 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site