Comment 8 for bug 477321

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Schily (schilling-fokus) wrote :

-vv does not give helpful new information in your case.

The SCSI command timeout for the write commands for
a DVD is 100 seconds. If sending a kill signal does not
show any result after 100 seconds, there must be a kernel bug.

Even though, your problem may be caused by a cable
problem (that caused a hung DMA), the kernel should be able
to abort things after the intended timeout.

You should contact the Linux kernel folks for help.