On Wed, 11 Aug 2004, Norbert Preining wrote:

> > Check in drivers/usb/core/usb.c and see if it mentions
> > usb_all_devices_rwsem anywhere.  I'd do it myself, but I don't know _any_
> 
> Not there, nowhere. Nothing with rwsem at all.
> 
> So we are back to a zero start again?

Not quite just yet.  The rwsem guess was wrong, but maybe you can still 
learn some more.  Going through the old messages in the email archive, I 
noticed that the stack dumps you posted don't include the khubd process.  
That is most likely the critical process to look at; when it hangs it 
tends to block everything else (like lsusb and cat /proc/bus/usb/devices).

In fact, I would guess that khubd is hanging at the point where one of 
your devices is recognized and its driver probed.  Knowing what khubd is 
doing would tell us which driver and where it is running into trouble.

Alan Stern



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