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

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Date:	Mon, 30 May 2011 07:54:14 +0200
From:	Oliver Neukum <oneukum@...e.de>
To:	Riccardo Magliocchetti <riccardo.magliocchetti@...il.com>,
	linux-usb@...r.kernel.org
Cc:	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

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"?

	Regards
		Oliver


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