linux-kernel - Re: [BUG] wireless : cpu stuck for 61s

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Date:	Tue, 29 Jul 2008 14:32:04 +0200
From:	Johannes Berg <johannes@...solutions.net>
To:	Dave Young <hidave.darkstar@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: [BUG] wireless : cpu stuck for 61s

On Tue, 2008-07-29 at 13:57 +0800, Dave Young wrote:
> While set my wlan0 to ad-hoc mode and then set the essid to something,
> this bug triggered.
> 
> I suspect it's related to debugfs or mutex? But I'm not sure.
> 
> Jul 29 13:01:46 darkstar kernel: [ 8033.736493] BUG: soft lockup - CPU#0 stuck for 61s! [events/0:9]
> Jul 29 13:01:46 darkstar kernel: [ 8033.736493] 
> Jul 29 13:01:46 darkstar kernel: [ 8033.736493] Pid: 9, comm: events/0 Tainted: G        W (2.6.26-smp #3)
> Jul 29 13:01:46 darkstar kernel: [ 8033.736493] EIP: 0060:[<c0450bc3>] EFLAGS: 00000246 CPU: 0
> Jul 29 13:01:46 darkstar kernel: [ 8033.736493] EIP is at mutex_lock_nested+0x1b3/0x280
> Jul 29 13:01:46 darkstar kernel: [ 8033.736493] EAX: 00000000 EBX: f7bf5284 ECX: f7c7e000 EDX: f7bf52a8
> Jul 29 13:01:46 darkstar kernel: [ 8033.736493] ESI: f7bf5288 EDI: 00000246 EBP: f7c7fedc ESP: f7c7fe9c
> Jul 29 13:01:46 darkstar kernel: [ 8033.736493]  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> Jul 29 13:01:46 darkstar kernel: [ 8033.736493] CR0: 8005003b CR2: b800c5ac CR3: 36e71000 CR4: 000006d0
> Jul 29 13:01:46 darkstar kernel: [ 8033.736493] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
> Jul 29 13:01:46 darkstar kernel: [ 8033.736493] DR6: ffff0ff0 DR7: 00000400
> Jul 29 13:01:46 darkstar kernel: [ 8033.736493]  [<c02375a6>] ? debugfs_create_file+0x46/0x210

It looks like it's getting stuck on
mutex_lock(&parent->d_inode->i_mutex);

inside debugfs_create_by_name, but I have no idea why that would happen.

johannes

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