Re: kernel BUG at kernel/workqueue.c:104!

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Karl Hiramoto <karl <at>> writes:

> Hi,  i get this a lot now when doing:  "rmmod  cp2101 io_edgeport "
> I try and do the rmmod, because i loose comunications on the USB to 
> RS-232 adapters.
> ------------[ cut here ]------------
> kernel BUG at kernel/workqueue.c:104!
> invalid operand: 0000 [#1]

Thats because the scheduled work became empty before it was executed.
        --  BUG_ON(!list_empty(&work->entry)); --

Looks like someone forgot to flush_scheduled_work() before exiting. Can you 
try putting flush_scheduled_work() as the first line in cp2101_exit and 
whatever is the exit function of io_edgeport?

Just a wild guess. Things might be more complicated than this, but no harm in 


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