Hello,

Am Mittwoch, 19. November 2003 10:01 schrieb Zodel Wolfgang (MPI/SFS):

> we have built a linux kernel (version 2.4.22) with hot-plugging USB device

> I have successfully connected one USB serial device (tty console) to the
> USB bus and opened (/dev/usb/ttyUSB0) by an application (terminal session).
> Then I have disconnected the USB serial device from the USB bus, during the
> USB device is still opened. The disconnect operation fails and a kernel
> oops occurs!!

[oops is in kfree]

You are not alone. I have some bug report for my driver (auerswald) also. 
I also know that the AVM isdn drivers have the same problem. In the ancient 
days of 2.4.10, all was fine. I have not had enough time to debug. But this 
seems to be a general problem for all drivers.

The oops is only happened if there is some ongoing traffic (urbs submitted) at 
the time of the disconnect.

Has anybody an idea what is going on?

best regards
Wolfgang Mües



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