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Date: Fri, 14 Jul 2006 08:00:06 -0700
From: Andrew Morton <akpm@osdl.org>
To: Reuben Farrelly <reuben-lkml@reub.net>
Cc: linux-kernel@vger.kernel.org, linux-usb-devel@lists.sourceforge.net
Subject: Re: 2.6.18-rc1-mm2
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On Fri, 14 Jul 2006 23:30:22 +1200
Reuben Farrelly <reuben-lkml@reub.net> wrote:

> 
> 
> On 14/07/2006 5:48 p.m., Andrew Morton wrote:
> > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.18-rc1/2.6.18-rc1-mm2/
> > 
> > - Patches were merged, added, dropped and fixed.  Nothing particularly exciting.
> > 
> > - Added the avr32 architecture.  Review is sought, please.
> 
> Another oops, USB related perhaps?

Yes, or driver core.

> Fedora Core release 5.90 (Test)
> Kernel 2.6.18-rc1-mm2 on an x86_64
> 
> tornado.reub.net login: Unable to handle kernel NULL pointer dereference at 
> 0000000000000020 RIP:
>   [<ffffffff8029a9b1>] __lock_acquire+0x81/0xcbb
> PGD 27153067 PUD 27152067 PMD 0
> Oops: 0000 [1] SMP
> last sysfs file: /devices/pci0000:00/0000:00:1d.0/usb2/2-1/2-1.2/usbdev2.4/dev
> CPU 0
> Modules linked in: hidp rfcomm l2cap bluetooth ipv6 ip_gre iptable_filter 
> iptable_nat ip_nat ip_conntrack nfnetlink iptable_mangle ip_tables binfmt_misc 
> iTCO_wdt i2c_i801 serio_raw
> Pid: 104, comm: khubd Not tainted 2.6.18-rc1-mm2 #1
> RIP: 0010:[<ffffffff8029a9b1>]  [<ffffffff8029a9b1>] __lock_acquire+0x81/0xcbb
> RSP: 0018:ffff81003f2ddc98  EFLAGS: 00010046
> RAX: 0000000000000002 RBX: 0000000000000246 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
> RBP: ffff81003f2ddd08 R08: 0000000000000001 R09: 0000000000000000
> R10: ffffffff80488338 R11: 0000000000000001 R12: 0000000000000000
> R13: ffffffff805ac760 R14: ffff810037f96140 R15: 0000000000000018
> FS:  0000000000000000(0000) GS:ffffffff808af000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0018 ES: 0018 CR0: 000000008005003b
> CR2: 0000000000000020 CR3: 000000002725c000 CR4: 00000000000006e0
> Process khubd (pid: 104, threadinfo ffff81003f2dc000, task ffff810037f96140)
> Stack:  ffffffff80263d05 0000000000000246 ffff81003ec0f4f0 ffff810012202370
>   000000003f2ddcd8 0000000000000002 0000000000000000 ffff81003ec0f4e8
>   ffff81003f2ddd08 0000000000000246 0000000000000000 ffffffff805ac760
> Call Trace:
>   [<ffffffff8029b63a>] lock_acquire+0x4f/0x75
>   [<ffffffff802654fa>] _spin_lock+0x25/0x34
>   [<ffffffff80488338>] klist_remove+0x15/0x36
>   [<ffffffff803b63fe>] bus_remove_device+0xa7/0xc9
>   [<ffffffff803b4d4d>] device_del+0x162/0x195
>   [<ffffffff803f5b96>] usb_disconnect+0xbb/0x10e
>   [<ffffffff803f69df>] hub_thread+0x3ff/0xc36
>   [<ffffffff802332a3>] kthread+0xd3/0x100
>   [<ffffffff802602f2>] child_rip+0x8/0x12
> 
> Code: 49 8b 5f 08 48 85 db 0f 85 4e 03 00 00 49 83 3f 00 75 03 4d
> RIP  [<ffffffff8029a9b1>] __lock_acquire+0x81/0xcbb
>   RSP <ffff81003f2ddc98>
> CR2: 0000000000000020
> 
> I didn't see this one but more than likely it happened when my 2 yr old hit the 
> KVM "change console" button (it's a USB KVM and there are no other USB devices 
> on the system).
> 

n->n_klist is NULL in klist_remove().