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Date: Sat, 22 Jul 2006 08:44:29 -0700
From: Andrew Morton <akpm@osdl.org>
To: Ian Stirling <tandra@mauve.plus.com>
Cc: linux-kernel@vger.kernel.org, linux-usb-devel@lists.sourceforge.net
Subject: Re: USB snd-usb-audio wedges lsusb when unplugged while playing
 sound.
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On Sat, 22 Jul 2006 13:12:37 +0100
Ian Stirling <tandra@mauve.plus.com> wrote:

> Config/... as my earlier message on USB - though with the bandwidth 
> enforcement
> turned off so it actually plays sound, when plugged into the USB1 port.
> 
> 2.6.17.
> 
> Basically - playing sound with
> mplayer -ao alsa:device=hw=1 or whatever - and then unplugging the
> soundcard completely wedges lsusb/usb configuration, until the mplayer 
> process is killed.
> 
> cat /proc/bus/usb/devices stalls.

Please get the machine into the wedged state, then do

	dmesg -c
	echo t > /proc/sysrq-trigger
	dmesg -s 1000000 > foo

then send foo, thanks.