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	Mon, 15 Jul 2013 05:27:34 -0400
Date: Mon, 15 Jul 2013 11:27:30 +0200
From: Krzysztof Mazur <krzysiek@podlesie.net>
To: Felix Fietkau <nbd@openwrt.org>
Cc: Sedat Dilek <sedat.dilek@gmail.com>, peizhao.research@gmail.com,
	linux-wireless@vger.kernel.org
Subject: Re: kernel panic on 3.10.0-rc7
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On Mon, Jul 15, 2013 at 11:06:27AM +0200, Felix Fietkau wrote:
> Please post the actual message output. Saying "it looks like something
> wrong with the rate control mechanism" doesn't give me anything useful
> to work with.
> 

Sorry, I added you to Cc after I removed the original Oops.

On Mon, Jul 1, 2013 at 8:55 AM, Peizhao Hu wrote:
> Hi,
>
> Is there anyone has the same problem with me? I have a cm9 radio card with
> the node.
>
> The kernel compiled and booted alright, but crashed short after I set it up
> in the ad hoc mode. From the debug message output, it looks like something
> wrong with the rate control mechanism when it is trying to the rate
> (minstreal_get_rate function in this case).
>
> Is this a bug?
>
> Kernel version
> 3.10.0-rc7
>
> root@alix-router:~# i[  250.809354] BUG: unable to handle kernel NULL
> pointe8
> [  250.812875] IP: [<d0952afa>] minstrel_get_rate+0x1a/0x220 [mac80211]
> [  250.812875] *pde = 00000000
> [  250.812875] Oops: 0000 [#1] SMP
> [  250.812875] Modules linked in: ath5k ath mac80211 cfg80211 arc4
> gpio_cs55]
> [  250.812875] CPU: 0 PID: 6 Comm: kworker/u2:0 Not tainted 3.10.0-rc7-cca+
> 1
> [  250.812875] Workqueue: phy0 ieee80211_iface_work [mac80211]
> [  250.812875] task: c002bfc0 ti: c0076000 task.ti: c0076000
> [  250.812875] EIP: 0060:[<d0952afa>] EFLAGS: 00010292 CPU: 0
> [  250.812875] EIP is at minstrel_get_rate+0x1a/0x220 [mac80211]
> [  250.812875] EAX: 00000000 EBX: 00000000 ECX: 00000000 EDX: cc2bf1c0
> [  250.812875] ESI: ce6cf900 EDI: c0077d00 EBP: c0077cac ESP: c0077c94
> [  250.812875]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
> [  250.812875] CR0: 8005003b CR2: 00000038 CR3: 0c245000 CR4: 00000090
> [  250.812875] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> [  250.812875] DR6: ffff0ff0 DR7: 00000400
> [  250.812875] Stack:
> [  250.812875]  00017901 cc101500 00000180 cc133500 d0967920 cc2bf1e1
> c0077cd
> [  250.812875]  c0077d00 00000180 ce525170 00000000 cc2bf1e0 c0077d00
> cc2bf10
> [  250.812875]  c0077d24 c0077d30 d0927651 c02c5550 c0077cec d092001c
> cc1335c
> [  250.812875] Call Trace:
> [  250.812875]  [<d091a8dd>] rate_control_get_rate+0x9d/0xe0 [mac80211]
> [  250.812875]  [<d0927651>] ieee80211_beacon_get_tim+0x1a1/0x330 [mac80211]
> [  250.812875]  [<d092001c>] ? ieee80211_assign_beacon+0x1bc/0x1c0
> [mac80211]
> [  250.812875]  [<d0da3fb9>] ath5k_beacon_update+0x29/0x340 [ath5k]
> [  250.812875]  [<d0d99366>] ? ath5k_hw_get_frame_duration+0xa6/0xc0 [ath5k]
> [  250.812875]  [<d0d99140>] ? ath5k_hw_set_ifs_intervals+0x110/0x1b0
> [ath5k]
> [  250.812875]  [<d0da92d3>] ath5k_bss_info_changed+0x113/0x1f0 [ath5k]
> [  250.812875]  [<d0da91c0>] ? ath5k_configure_filter+0x1c0/0x1c0 [ath5k]
> [  250.812875]  [<d0908903>] ieee80211_bss_info_change_notify+0xc3/0x1c0
> [ma]
> [  250.812875]  [<d09141db>] ? __ieee80211_sta_join_ibss+0x19b/0x660
> [mac802]
> [  250.812875]  [<d091442c>] __ieee80211_sta_join_ibss+0x3ec/0x660
> [mac80211]
> [  250.812875]  [<c157be33>] ? printk+0x4d/0x4f
> [  250.812875]  [<d0915b4d>] ieee80211_ibss_work+0x31d/0x3d0 [mac80211]
> [  250.812875]  [<d0916d2d>] ieee80211_iface_work+0x18d/0x310 [mac80211]
> [  250.812875]  [<c105025f>] process_one_work+0x10f/0x380
> [  250.812875]  [<c104e485>] ? start_worker+0x25/0x30
> [  250.812875]  [<c1051000>] ? manage_workers.isra.24+0x180/0x290
> [  250.812875]  [<c105120a>] worker_thread+0xfa/0x310
> [  250.812875]  [<c1051110>] ? manage_workers.isra.24+0x290/0x290
> [  250.812875]  [<c1056674>] kthread+0x94/0xa0
> [  250.812875]  [<c158b1f7>] ret_from_kernel_thread+0x1b/0x28
> [  250.812875]  [<c10565e0>] ? flush_kthread_worker+0x90/0x90
> [  250.812875] Code: 3d fe 93 f0 5d c3 90 90 90 90 90 90 90 90 90 90 90 55
> 88
> [  250.812875] EIP: [<d0952afa>] minstrel_get_rate+0x1a/0x220 [mac80211]
> SS:4
> [  250.812875] CR2: 0000000000000038
> [  250.815950] ---[ end trace 87b8337e77cb6664 ]---
> [  250.817834] Kernel panic - not syncing: Fatal exception in interrupt
>
>
>
> --
> Regards;
>
> Peizhao

Krzysiek