Kernel panic from usb-ohci

Kernel panic from usb-ohci

[Jean-Francois De Rudder]

Apologies if I am at the wrong place, thought a kernel panic would
justify the message.

Got this kernel bug on Mandrake 8.1 installing a Speedtouch ADSL modem
(USB). Unfortunately, I cannot copy and paste the content of the error
as as get a kernel panic straight away and the PC has'nt got kbd/mouse.

Basically everything works fine until I start running the modem_run
command, the pppd daemon and finally my iptables script. I get a
connection for anything from 1 to 5 minutes, which then results in the
following output:

usb-ohci.c : bus 00:0c.0 devnum 2 deletion in interrupt
Kernel BUG at usb_ohci.c: 886!
Invalid operand: 0000
CPU: 0
EIP: 0010 [<c8851de8>]
EFLAGS: 00010082

I stopped writing down all the values at this stage... I can supply them
if anybody needs them for further analysis...

I am running on an old Pentium 133 (Internet Gateway PC) with a DLINK
USB card (added on as no USB initially on PC) 

Thanks a lot!
Jean.

Re: Kernel panic from usb-ohci

[David Brownell]

The problem is the driver you're using on top of usb-ohci,
seemingly whatever talks to that ADSL modem.  It might
be fixed in a more recent kernel, I wouldn't know.

> usb-ohci.c : bus 00:0c.0 devnum 2 deletion in interrupt
> Kernel BUG at usb_ohci.c: 886!

As it says in the comment on line 884, the problem is likely
(all but certainly) that "some interface's driver has a refcount
bug".  Specifically, the OHCI driver is being told the device
has gone away.  Because it's in_interrupt(), that's a lie ...
only khubd is allowed to declare that, and of course that can't
ever say that in_interrupt().

- Dave