[BUG bisected] WARNING: CPU: 0 PID: 1550 at net/wireless/chan.c:373 cfg80211_chandef

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* [BUG bisected] WARNING: CPU: 0 PID: 1550 at net/wireless/chan.c:373 cfg80211_chandef_usable+0x30/0x15f()
@ 2013-10-21 12:09 Dirk Gouders
  2013-10-22 13:23 ` Simon Wunderlich
  0 siblings, 1 reply; 5+ messages in thread
From: Dirk Gouders @ 2013-10-21 12:09 UTC (permalink / raw)
  To: Simon Wunderlich; +Cc: Mathias Kretschmer, Johannes Berg, Linux Kernel

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 ]---
------------------------------------------------------------------------

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [BUG bisected] WARNING: CPU: 0 PID: 1550 at net/wireless/chan.c:373 cfg80211_chandef_usable+0x30/0x15f()
  2013-10-21 12:09 [BUG bisected] WARNING: CPU: 0 PID: 1550 at net/wireless/chan.c:373 cfg80211_chandef_usable+0x30/0x15f() Dirk Gouders
@ 2013-10-22 13:23 ` Simon Wunderlich
  2013-10-22 15:14   ` Dirk Gouders
  0 siblings, 1 reply; 5+ messages in thread
From: Simon Wunderlich @ 2013-10-22 13:23 UTC (permalink / raw)
  To: Dirk Gouders
  Cc: Simon Wunderlich, Mathias Kretschmer, Johannes Berg, Linux Kernel,
	sw

[-- Attachment #1: Type: text/plain, Size: 4208 bytes --]

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 ]---
> ------------------------------------------------------------------------

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^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [BUG bisected] WARNING: CPU: 0 PID: 1550 at net/wireless/chan.c:373 cfg80211_chandef_usable+0x30/0x15f()
  2013-10-22 13:23 ` Simon Wunderlich
@ 2013-10-22 15:14   ` Dirk Gouders
  2013-10-22 20:00     ` Simon Wunderlich
  0 siblings, 1 reply; 5+ messages in thread
From: Dirk Gouders @ 2013-10-22 15:14 UTC (permalink / raw)
  To: Simon Wunderlich
  Cc: Simon Wunderlich, Mathias Kretschmer, Johannes Berg, Linux Kernel,
	sw

Sorry for the noise, Simon, here is the reply to _all_ recipients:

Simon Wunderlich <simon.wunderlich@s2003.tu-chemnitz.de> writes:

> 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?

Hi Simon,

thanks for your quick response.

No need for censorship, I did some quick tests and stripped down my
wpa_supplicant.conf to a single entry.  With this configuration I get a
lot of traces:

ctrl_interface=/var/run/wpa_supplicant
eapol_version=1
ap_scan=1
fast_reauth=1

network={
	frequency=2412
	group=TKIP
	key_mgmt=NONE
	mode=1
	pairwise=NONE
	ssid="Nokia_n9"
}

I will also attach a dmesg output of my tests.

>  * your wpa_supplicant command line parameters when running

It is running with a wpa_cli like this:

/usr/sbin/wpa_supplicant -c /etc/wpa_supplicant/wpa_supplicant.conf \
    -W -B -i wlp4s0 -P /var/run/wpa_supplicant-wlp4s0.pid
/usr/bin/wpa_cli -a /etc/wpa_supplicant/wpa_cli.sh \
    -p /var/run/wpa_supplicant -i wlp4s0 -P /var/run/wpa_cli-wlp4s0.pid -B

>  * environment infos - are there IBSS networks next to your notebook?

Here at home (where rabbit and hedgehog say good night to each other ;-)
I get no scan results -- except when I am using WiFi Hotspot on my Nokia
N9 what I use the entry in the above config for.

In the office where we have Wi-Fi networks, I have to comment out
matching config entries to get the traces.

I hope that answers your question -- I am not very fluent in Wi-Fi
terminology.

> 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 ...

I wished I could simply try to revert commit 3aede78aad2a7e to see if it
indeed is responsible but a simple revert failed.  If you want me to, I
could try to do that manually or whatever you might think helps to
ensure that we look at the proper commit.

Thanks,

Dirk

[  257.446207] brcmsmac bcma0:0: brcms_ops_bss_info_changed: qos enabled: false (implement)
[  257.446219] brcmsmac bcma0:0: brcms_ops_config: change power-save mode: false (implement)
[  257.446365] IPv6: ADDRCONF(NETDEV_UP): wlp4s0: link is not ready
[  325.100295] brcmsmac bcma0:0: brcms_ops_bss_info_changed: qos enabled: false (implement)
[  325.100308] brcmsmac bcma0:0: brcms_ops_config: change power-save mode: false (implement)
[  325.100452] IPv6: ADDRCONF(NETDEV_UP): wlp4s0: link is not ready
[  326.267812] brcmsmac bcma0:0: brcms_ops_bss_info_changed: qos enabled: true (implement)
[  326.267824] brcmsmac bcma0:0: brcms_ops_config: change power-save mode: false (implement)
[  326.268005] IPv6: ADDRCONF(NETDEV_UP): wlp4s0: link is not ready
[  326.268244] wlp4s0: Trigger new scan to find an IBSS to join
[  328.163335] brcmsmac bcma0:0: brcms_ops_bss_info_changed: Beacon enabled: false
[  328.163349] brcmsmac bcma0:0: brcms_ops_bss_info_changed: IBSS joined: false (implement)
[  330.778227] wlp4s0: Trigger new scan to find an IBSS to join
[  333.792921] wlp4s0: Trigger new scan to find an IBSS to join
[  336.791637] wlp4s0: Trigger new scan to find an IBSS to join
[  337.409105] wlp4s0: Creating new IBSS network, BSSID 9e:71:4a:12:ac:57
[  337.409112] ------------[ cut here ]------------
[  337.409124] WARNING: CPU: 0 PID: 1549 at net/wireless/chan.c:373 cfg80211_chandef_usable+0x30/0x15f()
[  337.409126] Modules linked in: option usb_wwan brcmsmac cordic brcmutil bcma
[  337.409143] CPU: 0 PID: 1549 Comm: kworker/u4:5 Not tainted 3.12.0-rc6+ #20
[  337.409145] Hardware name: LENOVO 08946MG/MoutCook, BIOS 33CN14WW        05/10/2010
[  337.409155] Workqueue: phy0 ieee80211_iface_work
[  337.409159]  0000000000000000 0000000000000009 ffffffff8161e3c7 0000000000000000
[  337.409164]  ffffffff81068b00 ffff88006dd607c0 ffffffff815e79e4 0000000000000000
[  337.409168]  000000000000000f ffff88006fc63dc2 ffff88006fc63d50 ffff88006fe1e200
[  337.409174] Call Trace:
[  337.409185]  [<ffffffff8161e3c7>] ? dump_stack+0x50/0x80
[  337.409193]  [<ffffffff81068b00>] ? warn_slowpath_common+0x73/0x8b
[  337.409198]  [<ffffffff815e79e4>] ? cfg80211_chandef_usable+0x30/0x15f
[  337.409202]  [<ffffffff815e79e4>] ? cfg80211_chandef_usable+0x30/0x15f
[  337.409207]  [<ffffffff815f7c2e>] ? __ieee80211_sta_join_ibss+0x162/0x6e2
[  337.409213]  [<ffffffff8161b8cd>] ? printk+0x4f/0x54
[  337.409218]  [<ffffffff815f8439>] ? ieee80211_sta_create_ibss+0xc8/0xce
[  337.409223]  [<ffffffff815f91ed>] ? ieee80211_ibss_work+0x255/0x3c5
[  337.409230]  [<ffffffff8107addb>] ? process_one_work+0x1c7/0x2e6
[  337.409236]  [<ffffffff81078c58>] ? pwq_activate_delayed_work+0x1e/0x28
[  337.409241]  [<ffffffff8107b346>] ? worker_thread+0x1cb/0x2c4
[  337.409246]  [<ffffffff8107b17b>] ? rescuer_thread+0x25c/0x25c
[  337.409252]  [<ffffffff8107ff37>] ? kthread+0xad/0xb5
[  337.409264]  [<ffffffff81080000>] ? kthread_create_on_node+0xc1/0x115
[  337.409271]  [<ffffffff8107fe8a>] ? kthread_freezable_should_stop+0x3b/0x3b
[  337.409284]  [<ffffffff816247bc>] ? ret_from_fork+0x7c/0xb0
[  337.409292]  [<ffffffff8107fe8a>] ? kthread_freezable_should_stop+0x3b/0x3b
[  337.409297] ---[ end trace 8c9c4e19c81db3fc ]---
[  337.409301] wlp4s0: Failed to join IBSS, beacons forbidden
[  340.018245] brcmsmac bcma0:0: brcms_ops_bss_info_changed: Beacon enabled: false
[  340.018256] brcmsmac bcma0:0: brcms_ops_bss_info_changed: IBSS joined: false (implement)
[  342.773061] wlp4s0: Trigger new scan to find an IBSS to join
[  345.787767] wlp4s0: Trigger new scan to find an IBSS to join
[  348.786469] wlp4s0: Trigger new scan to find an IBSS to join
[  349.403920] wlp4s0: Creating new IBSS network, BSSID 3a:7b:c4:91:7f:7f
[  349.403927] ------------[ cut here ]------------
[  349.403939] WARNING: CPU: 0 PID: 1550 at net/wireless/chan.c:373 cfg80211_chandef_usable+0x30/0x15f()
[  349.403941] Modules linked in: option usb_wwan brcmsmac cordic brcmutil bcma
[  349.403956] CPU: 0 PID: 1550 Comm: kworker/u4:6 Tainted: G        W    3.12.0-rc6+ #20
[  349.403958] Hardware name: LENOVO 08946MG/MoutCook, BIOS 33CN14WW        05/10/2010
[  349.403965] Workqueue: phy0 ieee80211_iface_work
[  349.403968]  0000000000000000 0000000000000009 ffffffff8161e3c7 0000000000000000
[  349.403973]  ffffffff81068b00 ffff88006dd607c0 ffffffff815e79e4 0000000000000000
[  349.403978]  000000000000000f ffff88006fc43dc2 ffff88006fc43d50 ffff88006fe1e200
[  349.403983] Call Trace:
[  349.403995]  [<ffffffff8161e3c7>] ? dump_stack+0x50/0x80
[  349.404003]  [<ffffffff81068b00>] ? warn_slowpath_common+0x73/0x8b
[  349.404007]  [<ffffffff815e79e4>] ? cfg80211_chandef_usable+0x30/0x15f
[  349.404011]  [<ffffffff815e79e4>] ? cfg80211_chandef_usable+0x30/0x15f
[  349.404016]  [<ffffffff815f7c2e>] ? __ieee80211_sta_join_ibss+0x162/0x6e2
[  349.404022]  [<ffffffff8161b8cd>] ? printk+0x4f/0x54
[  349.404027]  [<ffffffff815f8439>] ? ieee80211_sta_create_ibss+0xc8/0xce
[  349.404032]  [<ffffffff815f91ed>] ? ieee80211_ibss_work+0x255/0x3c5
[  349.404039]  [<ffffffff8107addb>] ? process_one_work+0x1c7/0x2e6
[  349.404045]  [<ffffffff81078c58>] ? pwq_activate_delayed_work+0x1e/0x28
[  349.404050]  [<ffffffff8107b346>] ? worker_thread+0x1cb/0x2c4
[  349.404055]  [<ffffffff8107b17b>] ? rescuer_thread+0x25c/0x25c
[  349.404060]  [<ffffffff8107ff37>] ? kthread+0xad/0xb5
[  349.404065]  [<ffffffff81080000>] ? kthread_create_on_node+0xc1/0x115
[  349.404070]  [<ffffffff8107fe8a>] ? kthread_freezable_should_stop+0x3b/0x3b
[  349.404076]  [<ffffffff816247bc>] ? ret_from_fork+0x7c/0xb0
[  349.404081]  [<ffffffff8107fe8a>] ? kthread_freezable_should_stop+0x3b/0x3b
[  349.404084] ---[ end trace 8c9c4e19c81db3fd ]---
[  349.404087] wlp4s0: Failed to join IBSS, beacons forbidden
[  351.877102] brcmsmac bcma0:0: brcms_ops_bss_info_changed: Beacon enabled: false
[  351.877112] brcmsmac bcma0:0: brcms_ops_bss_info_changed: IBSS joined: false (implement)
[  355.767433] wlp4s0: Trigger new scan to find an IBSS to join
[  358.782189] wlp4s0: Trigger new scan to find an IBSS to join
[  359.399618] wlp4s0: Creating new IBSS network, BSSID 66:8d:31:ac:40:2a
[  359.399626] ------------[ cut here ]------------
[  359.399638] WARNING: CPU: 1 PID: 1549 at net/wireless/chan.c:373 cfg80211_chandef_usable+0x30/0x15f()
[  359.399640] Modules linked in: option usb_wwan brcmsmac cordic brcmutil bcma
[  359.399656] CPU: 1 PID: 1549 Comm: kworker/u4:5 Tainted: G        W    3.12.0-rc6+ #20
[  359.399658] Hardware name: LENOVO 08946MG/MoutCook, BIOS 33CN14WW        05/10/2010
[  359.399664] Workqueue: phy0 ieee80211_iface_work
[  359.399667]  0000000000000000 0000000000000009 ffffffff8161e3c7 0000000000000000
[  359.399672]  ffffffff81068b00 ffff88006dd607c0 ffffffff815e79e4 0000000000000000
[  359.399677]  000000000000000f ffff88006fc63dc2 ffff88006fc63d50 ffff88006fe1e200
[  359.399683] Call Trace:
[  359.399694]  [<ffffffff8161e3c7>] ? dump_stack+0x50/0x80
[  359.399702]  [<ffffffff81068b00>] ? warn_slowpath_common+0x73/0x8b
[  359.399706]  [<ffffffff815e79e4>] ? cfg80211_chandef_usable+0x30/0x15f
[  359.399711]  [<ffffffff815e79e4>] ? cfg80211_chandef_usable+0x30/0x15f
[  359.399716]  [<ffffffff815f7c2e>] ? __ieee80211_sta_join_ibss+0x162/0x6e2
[  359.399721]  [<ffffffff8161b8cd>] ? printk+0x4f/0x54
[  359.399727]  [<ffffffff815f8439>] ? ieee80211_sta_create_ibss+0xc8/0xce
[  359.399731]  [<ffffffff815f91ed>] ? ieee80211_ibss_work+0x255/0x3c5
[  359.399739]  [<ffffffff8107addb>] ? process_one_work+0x1c7/0x2e6
[  359.399744]  [<ffffffff81078c58>] ? pwq_activate_delayed_work+0x1e/0x28
[  359.399749]  [<ffffffff8107b346>] ? worker_thread+0x1cb/0x2c4
[  359.399754]  [<ffffffff8107b17b>] ? rescuer_thread+0x25c/0x25c
[  359.399760]  [<ffffffff8107ff37>] ? kthread+0xad/0xb5
[  359.399764]  [<ffffffff81080000>] ? kthread_create_on_node+0xc1/0x115
[  359.399769]  [<ffffffff8107fe8a>] ? kthread_freezable_should_stop+0x3b/0x3b
[  359.399776]  [<ffffffff816247bc>] ? ret_from_fork+0x7c/0xb0
[  359.399780]  [<ffffffff8107fe8a>] ? kthread_freezable_should_stop+0x3b/0x3b
[  359.399784] ---[ end trace 8c9c4e19c81db3fe ]---
[  359.399786] wlp4s0: Failed to join IBSS, beacons forbidden
[  361.764903] wlp4s0: Trigger new scan to find an IBSS to join
[  362.382331] wlp4s0: Creating new IBSS network, BSSID 42:b3:7c:d2:ed:eb
[  362.382337] ------------[ cut here ]------------
[  362.382346] WARNING: CPU: 0 PID: 1550 at net/wireless/chan.c:373 cfg80211_chandef_usable+0x30/0x15f()
[  362.382348] Modules linked in: option usb_wwan brcmsmac cordic brcmutil bcma
[  362.382363] CPU: 0 PID: 1550 Comm: kworker/u4:6 Tainted: G        W    3.12.0-rc6+ #20
[  362.382365] Hardware name: LENOVO 08946MG/MoutCook, BIOS 33CN14WW        05/10/2010
[  362.382371] Workqueue: phy0 ieee80211_iface_work
[  362.382373]  0000000000000000 0000000000000009 ffffffff8161e3c7 0000000000000000
[  362.382378]  ffffffff81068b00 ffff88006dd607c0 ffffffff815e79e4 0000000000000000
[  362.382383]  000000000000000f ffff88006fc43dc2 ffff88006fc43d50 ffff88006fe1e200
[  362.382388] Call Trace:
[  362.382397]  [<ffffffff8161e3c7>] ? dump_stack+0x50/0x80
[  362.382403]  [<ffffffff81068b00>] ? warn_slowpath_common+0x73/0x8b
[  362.382408]  [<ffffffff815e79e4>] ? cfg80211_chandef_usable+0x30/0x15f
[  362.382412]  [<ffffffff815e79e4>] ? cfg80211_chandef_usable+0x30/0x15f
[  362.382417]  [<ffffffff815f7c2e>] ? __ieee80211_sta_join_ibss+0x162/0x6e2
[  362.382422]  [<ffffffff8161b8cd>] ? printk+0x4f/0x54
[  362.382427]  [<ffffffff815f8439>] ? ieee80211_sta_create_ibss+0xc8/0xce
[  362.382432]  [<ffffffff815f91ed>] ? ieee80211_ibss_work+0x255/0x3c5
[  362.382438]  [<ffffffff8107addb>] ? process_one_work+0x1c7/0x2e6
[  362.382443]  [<ffffffff81078c58>] ? pwq_activate_delayed_work+0x1e/0x28
[  362.382448]  [<ffffffff8107b346>] ? worker_thread+0x1cb/0x2c4
[  362.382453]  [<ffffffff8107b17b>] ? rescuer_thread+0x25c/0x25c
[  362.382458]  [<ffffffff8107ff37>] ? kthread+0xad/0xb5
[  362.382462]  [<ffffffff81080000>] ? kthread_create_on_node+0xc1/0x115
[  362.382467]  [<ffffffff8107fe8a>] ? kthread_freezable_should_stop+0x3b/0x3b
[  362.382479]  [<ffffffff816247bc>] ? ret_from_fork+0x7c/0xb0
[  362.382486]  [<ffffffff8107fe8a>] ? kthread_freezable_should_stop+0x3b/0x3b
[  362.382491] ---[ end trace 8c9c4e19c81db3ff ]---
[  362.382494] wlp4s0: Failed to join IBSS, beacons forbidden
[  363.739997] brcmsmac bcma0:0: brcms_ops_bss_info_changed: Beacon enabled: false
[  363.740008] brcmsmac bcma0:0: brcms_ops_bss_info_changed: IBSS joined: false (implement)


> 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 ]---
>> ------------------------------------------------------------------------


^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [BUG bisected] WARNING: CPU: 0 PID: 1550 at net/wireless/chan.c:373 cfg80211_chandef_usable+0x30/0x15f()
  2013-10-22 15:14   ` Dirk Gouders
@ 2013-10-22 20:00     ` Simon Wunderlich
  2013-10-23  5:41       ` Dirk Gouders
  0 siblings, 1 reply; 5+ messages in thread
From: Simon Wunderlich @ 2013-10-22 20:00 UTC (permalink / raw)
  To: Dirk Gouders
  Cc: Simon Wunderlich, Simon Wunderlich, Mathias Kretschmer,
	Johannes Berg, Linux Kernel

Hey Dirk,

> No need for censorship, I did some quick tests and stripped down my
> wpa_supplicant.conf to a single entry.  With this configuration I get a
> lot of traces:
> 
> ctrl_interface=/var/run/wpa_supplicant
> eapol_version=1
> ap_scan=1
> fast_reauth=1
> 
> network={
> 	frequency=2412
> 	group=TKIP
> 	key_mgmt=NONE
> 	mode=1
> 	pairwise=NONE
> 	ssid="Nokia_n9"
> }
> 
> I will also attach a dmesg output of my tests.
> 
> >  * your wpa_supplicant command line parameters when running
> 
> It is running with a wpa_cli like this:
> 
> /usr/sbin/wpa_supplicant -c /etc/wpa_supplicant/wpa_supplicant.conf \
>     -W -B -i wlp4s0 -P /var/run/wpa_supplicant-wlp4s0.pid
> /usr/bin/wpa_cli -a /etc/wpa_supplicant/wpa_cli.sh \
>     -p /var/run/wpa_supplicant -i wlp4s0 -P /var/run/wpa_cli-wlp4s0.pid -B
> 

Thanks a lot for this, I could reproduce the issue and fix it, will send the fix 
in a minute - please try and report back. 

Just two notes on your setup in case you are interested:

 * Your wpa-supplicant setup looks a little like an old WPA-NONE setup, but 
this is not supported anymore and will not encrypt your messages. Please have 
a look at IBSS/RSN if you want encryption.
 * Your wpa_supplicant uses the old wext interface to the kernel. This is 
deprecated, it would better to use the (not so) new nl80211 interface instead. 
You will also get goodies such as 802.11n rates in ad-hoc mode if your 
hardware supports it. :)

Thanks again for reporting,
   Simon

^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [BUG bisected] WARNING: CPU: 0 PID: 1550 at net/wireless/chan.c:373 cfg80211_chandef_usable+0x30/0x15f()
  2013-10-22 20:00     ` Simon Wunderlich
@ 2013-10-23  5:41       ` Dirk Gouders
  0 siblings, 0 replies; 5+ messages in thread
From: Dirk Gouders @ 2013-10-23  5:41 UTC (permalink / raw)
  To: Simon Wunderlich
  Cc: Simon Wunderlich, Simon Wunderlich, Mathias Kretschmer,
	Johannes Berg, Linux Kernel

Hi Simon,

Simon Wunderlich <sw@simonwunderlich.de> writes:

> Hey Dirk,
>
>> No need for censorship, I did some quick tests and stripped down my
>> wpa_supplicant.conf to a single entry.  With this configuration I get a
>> lot of traces:
>> 
>> ctrl_interface=/var/run/wpa_supplicant
>> eapol_version=1
>> ap_scan=1
>> fast_reauth=1
>> 
>> network={
>> 	frequency=2412
>> 	group=TKIP
>> 	key_mgmt=NONE
>> 	mode=1
>> 	pairwise=NONE
>> 	ssid="Nokia_n9"
>> }
>> 
>> I will also attach a dmesg output of my tests.
>> 
>> >  * your wpa_supplicant command line parameters when running
>> 
>> It is running with a wpa_cli like this:
>> 
>> /usr/sbin/wpa_supplicant -c /etc/wpa_supplicant/wpa_supplicant.conf \
>>     -W -B -i wlp4s0 -P /var/run/wpa_supplicant-wlp4s0.pid
>> /usr/bin/wpa_cli -a /etc/wpa_supplicant/wpa_cli.sh \
>>     -p /var/run/wpa_supplicant -i wlp4s0 -P /var/run/wpa_cli-wlp4s0.pid -B
>> 
>
> Thanks a lot for this, I could reproduce the issue and fix it, will send the fix 
> in a minute - please try and report back. 

thanks a lot, will send my test result immediately.

> Just two notes on your setup in case you are interested:

Yes, I am interested - I was just afraid to ask, because I didn't want
to cause too much noise with probably trivial problems ;-)

>  * Your wpa-supplicant setup looks a little like an old WPA-NONE setup, but 
> this is not supported anymore and will not encrypt your messages. Please have 
> a look at IBSS/RSN if you want encryption.

Yes, I very rarely use that connection and always have in mind that it
is unencrypted.  I will have a look at this but expect the mobile phone
side to be the hard one to get it to offer reliable encryption.

>  * Your wpa_supplicant uses the old wext interface to the kernel. This is 
> deprecated, it would better to use the (not so) new nl80211 interface instead. 
> You will also get goodies such as 802.11n rates in ad-hoc mode if your 
> hardware supports it. :)

Thats good to know, I will change my setup accordingly.

Thanks again for your help,

Dirk

> Thanks again for reporting,
>    Simon

^ permalink raw reply	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2013-10-23  5:41 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-10-21 12:09 [BUG bisected] WARNING: CPU: 0 PID: 1550 at net/wireless/chan.c:373 cfg80211_chandef_usable+0x30/0x15f() Dirk Gouders
2013-10-22 13:23 ` Simon Wunderlich
2013-10-22 15:14   ` Dirk Gouders
2013-10-22 20:00     ` Simon Wunderlich
2013-10-23  5:41       ` Dirk Gouders

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