Re: iwlwifi + wpa2-leap + multiple AP's = call trace

[Arend Van Spriel <arend.vanspriel@broadcom.com>]

On 13-7-2016 2:29, Ismael Farfán wrote:
> Hello list
> 
> I searched this error around and didn't find anything, so here it goes.
> 
> Today I tried to connect to an enterprise network, which means,
> literally, tens of AP's sharing the same name... the network requieres
> user/password authentication (wpa2-leap).
> 
> I'm using Arch
> $ uname -a
> Linux 4.6.3-1-ARCH #1 SMP PREEMPT Fri Jun 24 21:19:13 CEST 2016 x86_64 GNU/Linux
> 
> Since the thing just didn't connect, I checked dmesg and found this:
> 
> Any ideas?

>From the stack trace it seems wpa_supplicant on Arch is using WEXT API.
You could try and change it to use NL80211 API. Personally, I have not
used Arch Linux so no idea where to change that.

The warning is here [1]:

503         IWL_DEBUG_TE(mvm, "Add new TE, duration %d TU\n",
504                      le32_to_cpu(te_cmd->duration));
505
506         spin_lock_bh(&mvm->time_event_lock);
507         if (WARN_ON(te_data->id != TE_MAX)) {
508                 spin_unlock_bh(&mvm->time_event_lock);
509                 return -EIO;
510         }

It seems this function is called with te_data that is already in use,
but that is my uneducated guess so I may be wrong.

Regards,
Arend

[1]
http://lxr.free-electrons.com/source/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c#L507
> 
> [   83.030072] wifi0: aborting authentication with xx:xx:xx:xx:xx:xx
> by local choice (Reason: 3=DEAUTH_LEAVING)
> [   83.030073] ------------[ cut here ]------------
> [   83.030082] WARNING: CPU: 2 PID: 1087 at
> drivers/net/wireless/intel/iwlwifi/mvm/time-event.c:507 iwl_mvm_tim
> e_event_send_add+0x1c6/0x200 [iwlmvm]
> [   83.030157] CPU: 2 PID: 1087 Comm: wpa_supplicant Tainted: G
>    O    4.6.3-1-ARCH #1
> [   83.030158] Hardware name: Notebook
> P65_P67SA                       /P65_P67SA
>                 , BIOS 1.03.01 07/22/2015
> [   83.030160]  0000000000000286 0000000009e998bc ffff880403a5b940
> ffffffff812e54c2
> [   83.030162]  0000000000000000 0000000000000000 ffff880403a5b980
> ffffffff8107a6bb
> [   83.030164]  000001fb81a8a180 ffff88041b443580 ffff88041c329548
> 00000000fffffffb
> [   83.030167] Call Trace:
> [   83.030172]  [<ffffffff812e54c2>] dump_stack+0x63/0x81
> [   83.030174]  [<ffffffff8107a6bb>] __warn+0xcb/0xf0
> [   83.030176]  [<ffffffff8107a7ed>] warn_slowpath_null+0x1d/0x20
> [   83.030181]  [<ffffffffa0b068d6>]
> iwl_mvm_time_event_send_add+0x1c6/0x200 [iwlmvm]
> [   83.030184]  [<ffffffff810c4772>] ? up+0x32/0x50
> [   83.030187]  [<ffffffff810d371b>] ? wake_up_klogd+0x3b/0x50
> [   83.030189]  [<ffffffff810d3c19>] ? console_unlock+0x4e9/0x590
> [   83.030193]  [<ffffffffa0b07520>]
> iwl_mvm_protect_session+0x220/0x280 [iwlmvm]
> [   83.030196]  [<ffffffffa0af100e>] ? iwl_mvm_ref_sync+0x2e/0x140 [iwlmvm]
> [   83.030199]  [<ffffffff810d423f>] ? vprintk_default+0x1f/0x30
> [   83.030202]  [<ffffffffa0af154a>]
> iwl_mvm_mac_mgd_prepare_tx+0x5a/0xa0 [iwlmvm]
> [   83.030216]  [<ffffffffa0c8e198>] ieee80211_mgd_deauth+0x338/0x4d0 [mac80211]
> [   83.030219]  [<ffffffff810b2333>] ? enqueue_entity+0x323/0xd70
> [   83.030228]  [<ffffffffa0c579b8>] ieee80211_deauth+0x18/0x20 [mac80211]
> [   83.030237]  [<ffffffffa05a1b8f>] cfg80211_mlme_deauth+0x9f/0x1a0 [cfg80211]
> [   83.030242]  [<ffffffffa05a62da>] cfg80211_disconnect+0x9a/0x200 [cfg80211]
> [   83.030248]  [<ffffffffa05c4529>]
> cfg80211_mgd_wext_siwessid+0xa9/0x170 [cfg80211]
> [   83.030255]  [<ffffffffa05c3512>] cfg80211_wext_siwessid+0x22/0x40 [cfg80211]
> [   83.030258]  [<ffffffff815af803>] ioctl_standard_iw_point+0x133/0x350
> [   83.030264]  [<ffffffffa05c34f0>] ?
> cfg80211_wext_giwessid+0x50/0x50 [cfg80211]
> [   83.030266]  [<ffffffff810a4a82>] ? wake_up_q+0x32/0x70
> [   83.030268]  [<ffffffff815b0930>] ? iw_handler_get_private+0x60/0x60
> [   83.030271]  [<ffffffff815afd07>] ioctl_standard_call+0x87/0xd0
> [   83.030273]  [<ffffffff815afc80>] ? call_commit_handler.part.4+0x30/0x30
> [   83.030275]  [<ffffffff815afc10>] wireless_process_ioctl+0x1f0/0x230
> [   83.030278]  [<ffffffff814b52fe>] ? dev_get_by_name_rcu+0x5e/0x80
> [   83.030280]  [<ffffffff815aff58>] wext_handle_ioctl+0x78/0xd0
> [   83.030283]  [<ffffffff814d7777>] dev_ioctl+0x2a7/0x5a0
> [   83.030285]  [<ffffffff8149dc86>] sock_ioctl+0x126/0x290
> [   83.030287]  [<ffffffff81209be3>] do_vfs_ioctl+0xa3/0x5d0
> [   83.030290]  [<ffffffff811f7362>] ? vfs_write+0x142/0x190
> [   83.030292]  [<ffffffff8120a189>] SyS_ioctl+0x79/0x90
> [   83.030294]  [<ffffffff815c71b2>] entry_SYSCALL_64_fastpath+0x1a/0xa4
> [   83.030296] ---[ end trace 8247b235a66a1a21 ]---
> 
> 
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