Hmm have not seen this till now, but may be. ctrl+c is a bit difficult to handle because it stops program immediately, so I even can not catch this to wait until cards have stopped what they just did to exit gracefully. Maybe I must think of an other way to stop the miner.
Ok, my bad. I tried to double up a single power cable to one of the Vega 64's instead of using two separate power inputs. Correcting that config resolved the crash (which never had a kernel, panic, btw. It would simply reboot, which spoke to hardware level behavior).
Sorry for the false alarm.
