One reboot later with the JMS567 enclosure solely powered by the board we’re back in trouble land:
[ 126.480465] sd 1:0:0:0: [sdb] tag#17 uas_eh_abort_handler 0 uas-tag 1 inflight: CMD OUT
[ 126.480476] sd 1:0:0:0: [sdb] tag#17 CDB: opcode=0x2a 2a 00 00 f6 30 00 00 04 00 00
[ 162.321748] sd 1:0:0:0: [sdb] tag#5 uas_eh_abort_handler 0 uas-tag 2 inflight: CMD
[ 162.321758] sd 1:0:0:0: [sdb] tag#5 CDB: opcode=0x35 35 00 00 00 00 00 00 00 00 00
[ 162.338423] scsi host1: uas_eh_device_reset_handler start
[ 167.642039] xhci-hcd xhci-hcd.10.auto: Timeout while waiting for setup device command
[ 167.848680] usb 8-1: reset SuperSpeed Gen 1 USB device number 2 using xhci-hcd
[ 167.867319] scsi host1: uas_eh_device_reset_handler success
[ 198.162935] sd 1:0:0:0: [sdb] tag#0 uas_eh_abort_handler 0 uas-tag 1 inflight: CMD OUT
[ 198.162945] sd 1:0:0:0: [sdb] tag#0 CDB: opcode=0x2a 2a 00 00 f6 3c 00 00 04 00 00
This is not an UAS problem but underpowering. At least the board is stuck in I/O now and no benchmark is able to run. Well, since USB3 storage sucks anyway time to move on to something else…