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Date:	Sat, 6 Mar 2010 10:03:50 +0100
From:	Oliver Neukum <>
To:	Jeff Chua <>
Cc:	Linus Torvalds <>,
	Jeff Chua <>,
	Linux Kernel <>,
	"Greg Kroah-Hartman" <>,
	Frederic Weisbecker <>,,
	Eli Collins <>
Subject: Re: commit 554f76962d3a6eb5110415f1591aca83f96a84ae hangs USB for vmware 7.0.1

Am Samstag, 6. März 2010 06:22:48 schrieb Jeff Chua:
> It seems to hang trying to read from /proc/bus/usb/devices.
> So, next I just try to "cat /proc/bus/usb/devices" and it hangs as well.
> Reverting the commit makes "cat /proc/bus/usb/devices" works again.
> Does this happen to me only?

As far as I can tell, yes. I cannot replicate it.

Please get me at least a sysrq-T trace.
There's no obvious place usb_device_read() takes usbfs_mutex.

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