Nut upsuser - Sep 2009 - usbhid-ups driver can't be killed...

Hello

I'm encountering a big problem with usbhid-ups driver : the driver hangs 
after loading some other modules (stale data message) !
And we can't restart it.

We load :
i2c-piix4
adm1021
adm9240
lm75

The unloading of the modules doesn't solve the problem.

# ps -eaf | grep usb
/root       188     2  0 07:29 ?        00:00:00 [ksuspend_usbd]
root       996     2  0 07:29 ?        00:00:00 [usbhid_resumer]
nut       5644     1  0 07:33 ?        00:01:02 /lib/nut/usbhid-ups -a 
ellipse
nut      17544     1  0 11:09 pts/0    00:00:00 /lib/nut/usbhid-ups -a 
ellipse
nut      17725     1  0 11:11 pts/0    00:00:00 /lib/nut/usbhid-ups -a 
ellipse
nut      18072     1  0 11:15 pts/0    00:00:00 /lib/nut/usbhid-ups -a 
ellipse
root     19518 14357  0 11:41 pts/0    00:00:00 lsusb
nut      20215     1  0 11:52 pts/2    00:00:00 /lib/nut/usbhid-ups -a 
ellipse -k
nut      20278     1  0 11:53 pts/2    00:00:00 /lib/nut/usbhid-ups -a 
ellipse -k
root     20290     1  0 11:53 ?        00:00:00 lsusb
nut      20497     1  0 11:58 pts/2    00:00:00 /lib/nut/usbhid-ups -a 
ellipse -k/

# upsdrvctl -DDD shutdown ellipse
/Network UPS Tools - UPS driver controller 2.4.1
Shutdown UPS: ellipse
exec: /lib/nut/usbhid-ups -a ellipse -k
Network UPS Tools - Generic HID driver 0.34 (2.4.1)
USB communication driver 0.31
Startup timer elapsed, continuing.../

After I've unplugged the ups from the usb port, lsusb has hanged too !

And the load average increases :
/load average: 10.24, 8.64, 6.58/

Is there a solution to kill these processes ?
kill -TERM, -QUIT or -9 don't work !

We are using nut 2.4.1-r1.

Any suggestions ? Is this a known bug ?
Thanks for your help.

Regards, Frederic

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On Sep 8, 2009, at 6:14 AM, Fr?d?ric Marchal wrote:
> Hello
>
> I'm encountering a big problem with usbhid-ups driver : the driver  
> hangs after loading some other modules (stale data message) !
> And we can't restart it.
>
> We load :
> i2c-piix4
> adm1021
> adm9240
> lm75
>
> The unloading of the modules doesn't solve the problem.
There is no direct connection between the kernel i2c drivers and  
userspace programs that interface to USB devices.

The only potential connection is that your USB root hub might be part  
of the same peripheral chip as the i2c bus master (PIIX4-compatible).
> After I've unplugged the ups from the usb port, lsusb has hanged too !
Definitely sounds like a kernel problem. When things are working  
properly, lsusb should not hang.

The best place to debug this is probably with your Linux distribution  
support channels (and you will need to give them much more specific  
information about your kernel version). There may be an interrupt  
issue with the i2c drivers. If you have another way of getting the  
sensor information (such as IPMI) you might want to look into that  
instead.