On Thu, 4 Jan 2007, Alan Stern wrote:

> > > > I suspect it has something to do with sysfs or usbfs.  This USB
> > > > keyboard hang has not happened before (and I have the same hardware in
> > > > this box for over a year, and I compile and test most of the rcX
> > > > kernels).  My workloads are CPU intensive (simulations, optimization
> > > > problems, data clustering) and this is the first serious I/O stress
> > > > test, but I would have noticed if it ever happened.
> > > Do USB and your network card share an interrupt line?
> > No, they do not.
> > > Could you enable DEBUG in drivers/usb/input/hid-core.c?
> > Will do and report back.
> Any results yet?

Hi Alan,

a few days ago I have received message from Florian off-list, where he 
provided me the following: (I have also CCed it to linux-usb-devel, as can 
be seen on [1]):

== cut here ==
I have recompiled the kernel with DEBUG defined to 1 in hid-core.c but
I have't got anything except that the keyboard was disconnected then
reattached:

  [ 3583.910202] usb 1-3: USB disconnect, address 3
  [ 3583.910208] usb 1-3.2: USB disconnect, address 5
  [17524.627801] usb 1-3: new high speed USB device using ehci_hcd and address 
6>
  [17524.688175] usb 1-3: configuration #1 chosen from 1 choice
  [17524.688243] hub 1-3:1.0: USB hub found
  [17524.688283] hub 1-3:1.0: 4 ports detected
  [17524.833265] usb 1-3.2: new low speed USB device using ehci_hcd and address 
7
  [17524.885024] usb 1-3.2: configuration #1 chosen from 1 choice
== cut here ==

I first thought whether this is not a HID-layer issue, but this kind of 
convinced me that the problem is USB-related.

I am trying to reproduce it here, but so far with no luck.

[1] 
http://www.mail-archive.com/linux-usb-devel@lists.sourceforge.net/msg49484.html

-- 
Jiri Kosina

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