linux-kernel - Re: FDTI-SIO: kernel-oops after resume

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Date:	Wed, 10 Jun 2009 00:50:18 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Martin Zwickel <martin.zwickel@...abasedigitaltv.de>
Cc:	linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	linux-usb@...r.kernel.org
Subject: Re: FDTI-SIO: kernel-oops after resume

On Tue, 9 Jun 2009 08:39:48 +0200 Martin Zwickel <martin.zwickel@...abasedigitaltv.de> wrote:

> Hi all,
> 
> I got an oops after resuming from suspend S3 state.
> 
> I had the ttyUSB0 opened with minicom and went to suspend S3.
> While in suspend I removed the physical serial device converter.
> While resuming I got this kernel oops:
> 
> [output]
> BUG: unable to handle kernel NULL pointer dereference at 00000044
> IP: [<c012ba40>] del_timer+0xc/0x4c
> *pde = 00000000 
> Oops: 0000 [#1] PREEMPT SMP 
> last sysfs file: /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
> Modules linked in: iptable_filter ip_tables x_tables i915 fb drm
> i2c_algo_bit cfbcopyarea i2c_core cfbimgblt cfbfillrect ipv6
> snd_hda_codec_conexant snd_hda_intel ftdi_sio iwlagn usbserial iwlcore
> snd_hda_codec pcspkr evdev
> 
> Pid: 16129, comm: minicom Not tainted (2.6.29.4 #3) ESPRIMO Mobile V5505           
>    
> EIP: 0060:[<c012ba40>] EFLAGS: 00210286 CPU: 0
> EIP is at del_timer+0xc/0x4c
> EAX: 00000044 EBX: 00000044 ECX: f2224b00 EDX: 00000044
> ESI: 00000000 EDI: 00000000 EBP: f6489df0 ESP: f6489de4
>  DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068
> Process minicom (pid: 16129, ti=f6488000 task=f1b54000 task.ti=f6488000)
> Stack:
>  00000000 f1a31c00 00000034 f6489e38 c01311a3 00000044 00200246 f6489e20
>  00200246 00000000 c0609e00 00000002 00000000 f6489e44 00200246 f6489e30
>  c014e2a6 c1aa7f80 f1a31c00 00000400 00000000 f6489e40 c01312c3 f6489e58
> Call Trace:
>  [<c01311a3>] ? __cancel_work_timer+0x20/0x135
>  [<c014e2a6>] ? __pagevec_free+0x17/0x1e
>  [<c01312c3>] ? cancel_delayed_work_sync+0xb/0xd
>  [<f8103692>] ? ftdi_close+0xc3/0xe2 [ftdi_sio]
>  [<c0175977>] ? fasync_helper+0xb3/0xbc
>  [<f820d722>] ? serial_close+0x7b/0x113 [usbserial]
>  [<c02a165c>] ? tty_release_dev+0x15b/0x392
>  [<c014e2a6>] ? __pagevec_free+0x17/0x1e
>  [<c0167c27>] ? add_partial+0x44/0x49
>  [<c017d860>] ? mntput_no_expire+0x18/0xe7
>  [<c0178b67>] ? dput+0x1d/0xfc
>  [<c02a18a5>] ? tty_release+0x12/0x1c
>  [<c016d193>] ? __fput+0xaf/0x155
>  [<c016d45d>] ? fput+0x17/0x19
>  [<c016ae36>] ? filp_close+0x51/0x5b
>  [<c0125870>] ? put_files_struct+0x68/0xaa
>  [<c01258e9>] ? exit_files+0x37/0x3c
>  [<c012681d>] ? do_exit+0x150/0x62e
>  [<c0126d5a>] ? do_group_exit+0x5f/0x88
>  [<c0126d92>] ? sys_exit_group+0xf/0x13
>  [<c0102df1>] ? sysenter_do_call+0x12/0x25
> Code: 04 0f 0b eb fe 39 50 08 75 0a 83 38 00 b9 01 00 00 00 75 07 e8 10 fe ff ff 89 c1 5d 89 c8 c3 55 89 e5 56 31 f6 53 89 c3 83 ec 04 <83> 38 00 74 34 8d 55 f4 e8 4c fd ff ff 83 3b 00 89 c1 74 1b 8b 
> EIP: [<c012ba40>] del_timer+0xc/0x4c SS:ESP 0068:f6489de4
> ---[ end trace 679defbdbe4aa1e4 ]---
> [/output]
> 
> Minicom said it lost the device, but was unable to close it.
> 
> The attached device:
> [output]
> USB Serial support registered for FTDI USB Serial Device
> ftdi_sio 6-1:1.0: FTDI USB Serial Device converter detected
> usb 6-1: Detected FT8U232AM
> usb 6-1: FTDI USB Serial Device converter now attached to ttyUSB0
> usbcore: registered new interface driver ftdi_sio
> ftdi_sio: v1.4.3:USB FTDI Serial Converters Driver
> [/output]
> 
> 
> My kernel runs with SMP and HIGHMEM if it matters:
> Linux tt-business 2.6.29.4 #3 SMP PREEMPT Fri Jun 5 00:03:39 WEST 2009 i686 Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00GHz GenuineIntel GNU/Linux
> 

The oops is very very similar to the one which Daniel Mack reported,
and which was fixed by

commit c16199fcd341f10147eb2e29a60aed41ceca55b4
Author: Alan Stern <stern@...land.harvard.edu>
Date:   Thu Apr 30 10:06:19 2009 -0400

    usb-serial: ftdi_sio: fix reference counting of ftdi_private

but your 2.6.29.4 contained that fix, so it seems that we still have a
problem here?
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