linux-kernel - Re: [linux-usb-devel] 2.6.21-rc6 USB Keyboard hangs (EHCI/UHCI/HID)

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Date:	Sat, 14 Apr 2007 22:11:04 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Matthias Andree <matthias.andree@....de>
cc:	linux-kernel@...r.kernel.org,
	<linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] 2.6.21-rc6 USB Keyboard hangs (EHCI/UHCI/HID)

On Sat, 14 Apr 2007, Matthias Andree wrote:

> I arrived at the computer today, to find khubd in D state again, but
> unfortunately, it does not show up in Alt-SysRq-T output. Do kernel
> threads show up there at all? 2.6.18.8-0.1 with SUSE patches on openSUSE
> 10.2.

As far as I know, all tasks including kernel threads should show up.  They 
certainly do on my machine.  However you're the second person to report 
that khubd doesn't appear after getting stuck in a D state.

Clearly something strange is going on.  I wish I knew what it was...

> I had stopped usbmon before however, so I don't know what the events
> have been leading to this lockup. Sorry. I'll leave usbmon running now.

Something else you can do is turn on CONFIG_USB_DEBUG and then check the
dmesg log for anything significant.

Alan Stern

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