Am 12.12.18 um 20:28 schrieb Chris Murphy:
But upon reboot, total implosion. Piles of USB errors and disconnects (the boot device is a Samsung FIT USB stick which fits flush in an Intel NUC). I didn't have time to troubleshoot what's causing this problem, other than to plug the USB stick into another computer to verify the stick is good and hasn't been corrupted. It's possibly related the mq-blk bug in 4.19.0 through 4.19.7 - so I've since upgraded to 4.19.8 which as those patches, but I haven't had a chance to retest.
this was NOT fixed in 4.19.7 Fedora had a patch for the distro kernel