linux-kernel - Re: [2.6.39] crash in acm_ctrl

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Message-ID: <4DE36118.4050706@gmail.com>
Date:	Mon, 30 May 2011 11:19:20 +0200
From:	Riccardo Magliocchetti <riccardo.magliocchetti@...il.com>
To:	Oliver Neukum <oneukum@...e.de>
CC:	linux-usb@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Oliver Neukum <oliver@...kum.name>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: Re: [2.6.39] crash in acm_ctrl_msg+0x16/0x59

Hi,

Il 30/05/2011 07:54, Oliver Neukum ha scritto:
> Am Sonntag, 29. Mai 2011, 16:04:02 schrieb Riccardo Magliocchetti:
>
>> mtp-probe: bus: 6, device: 4 was not an MTP device
>> [20462.901834] cdc_acm 6-1:1.0: ttyACM0: USB ACM device
>> [20462.904417] usbcore: registered new interface driver cdc_acm
>> [20462.904420] cdc_acm: v0.26:USB Abstract Control Model driver for USB
>> modems and ISDN adapters
>> [20463.624142] usb 6-1: USB disconnect, device number 4
>> [20463.641859] CPU 0
>>
>> This is the stracktrace:
>>
>> acm_ctrl_msg+0x16/0x59
>> mutex_lock+0x13/0x2a
>> acm_port_down+0x4c/0xcb
>> acm_tty_close+0x75/0x93
>> tty_release+0x1b5/0x47c
>> ? compat_do_readv_write+0x199/0x1ae
>> fput+0xf8/0x1ad
>> filp_close+0x69/0x75
>> sys_close+0x8a/0xea
>> sysenter_dispatch+0x07/0x32
>
> So we are trying to talk to a device that is already gone.
> Is there anything unusual about your device? Could you
> post "lsusb -v"?

Yes, the unusual thing is that is very prone to freezing when booting, 
in fact it freezed when i got the crash in the laptop. Will post lsusb 
output later in the day.

thanks,
riccardo
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