The kernel seems to lock up when data transfer starts, not while head position. But the software watchdog is able to reboot the machine. Up to 1.3.68, I never had any problems with the mcdx-driver. With the new 1.7 mcdx the cd light flickers fast, when the kernel locks up. Using 1.3.68 with the same cds, there are no problems.
Any help is really welcome.