Also I have been affected by this same bug. Can reproduce this bug with two separate external USB3 harddisks. 

Example outputs from dmesg:

[maalis 3 21:01] sd 18:0:0:0: [sdf] tag#4 uas_eh_abort_handler 0 uas-tag 5 inflight: CMD OUT 
[  +0,000006] sd 18:0:0:0: [sdf] tag#4 CDB: Write(10) 2a 00 00 d9 c8 10 00 04 00 00
[  +0,000125] sd 18:0:0:0: [sdf] tag#3 uas_eh_abort_handler 0 uas-tag 4 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#3 CDB: Write(10) 2a 00 00 d9 c4 10 00 04 00 00
[  +0,000140] sd 18:0:0:0: [sdf] tag#2 uas_eh_abort_handler 0 uas-tag 3 inflight: CMD OUT 
[  +0,000002] sd 18:0:0:0: [sdf] tag#2 CDB: Write(10) 2a 00 00 d9 c0 10 00 04 00 00
[  +0,000122] sd 18:0:0:0: [sdf] tag#1 uas_eh_abort_handler 0 uas-tag 2 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#1 CDB: Write(10) 2a 00 00 d9 bc 10 00 04 00 00
[  +0,000128] sd 18:0:0:0: [sdf] tag#0 uas_eh_abort_handler 0 uas-tag 1 inflight: CMD OUT 
[  +0,000005] sd 18:0:0:0: [sdf] tag#0 CDB: Write(10) 2a 00 00 d9 b8 10 00 04 00 00
[  +0,000117] sd 18:0:0:0: [sdf] tag#26 uas_eh_abort_handler 0 uas-tag 27 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#26 CDB: Write(10) 2a 00 00 d9 b4 10 00 04 00 00
[  +0,000097] sd 18:0:0:0: [sdf] tag#25 uas_eh_abort_handler 0 uas-tag 26 inflight: CMD OUT 
[  +0,000002] sd 18:0:0:0: [sdf] tag#25 CDB: Write(10) 2a 00 00 d9 b0 10 00 04 00 00
[  +0,000166] sd 18:0:0:0: [sdf] tag#24 uas_eh_abort_handler 0 uas-tag 25 inflight: CMD OUT 
[  +0,000002] sd 18:0:0:0: [sdf] tag#24 CDB: Write(10) 2a 00 00 d9 ac 10 00 04 00 00
[  +0,000105] sd 18:0:0:0: [sdf] tag#23 uas_eh_abort_handler 0 uas-tag 24 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#23 CDB: Write(10) 2a 00 00 d9 a8 10 00 04 00 00
[  +0,000122] sd 18:0:0:0: [sdf] tag#22 uas_eh_abort_handler 0 uas-tag 23 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#22 CDB: Write(10) 2a 00 00 d9 a4 10 00 04 00 00
[  +0,000122] sd 18:0:0:0: [sdf] tag#21 uas_eh_abort_handler 0 uas-tag 22 inflight: CMD OUT 
[  +0,000004] sd 18:0:0:0: [sdf] tag#21 CDB: Write(10) 2a 00 00 d9 a0 10 00 04 00 00
[  +0,000121] sd 18:0:0:0: [sdf] tag#20 uas_eh_abort_handler 0 uas-tag 21 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#20 CDB: Write(10) 2a 00 00 d9 9c 10 00 04 00 00
[  +0,000122] sd 18:0:0:0: [sdf] tag#19 uas_eh_abort_handler 0 uas-tag 20 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#19 CDB: Write(10) 2a 00 00 d9 98 10 00 04 00 00
[  +0,000099] sd 18:0:0:0: [sdf] tag#18 uas_eh_abort_handler 0 uas-tag 19 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#18 CDB: Write(10) 2a 00 00 d9 94 10 00 04 00 00
[  +0,000145] sd 18:0:0:0: [sdf] tag#17 uas_eh_abort_handler 0 uas-tag 18 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#17 CDB: Write(10) 2a 00 00 d9 90 10 00 04 00 00
[  +0,000123] sd 18:0:0:0: [sdf] tag#16 uas_eh_abort_handler 0 uas-tag 17 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#16 CDB: Write(10) 2a 00 00 d9 8c 10 00 04 00 00
[  +0,000122] sd 18:0:0:0: [sdf] tag#15 uas_eh_abort_handler 0 uas-tag 16 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#15 CDB: Write(10) 2a 00 00 d9 88 10 00 04 00 00
[  +0,000126] sd 18:0:0:0: [sdf] tag#14 uas_eh_abort_handler 0 uas-tag 15 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#14 CDB: Write(10) 2a 00 00 d9 84 10 00 04 00 00
[  +0,000116] sd 18:0:0:0: [sdf] tag#13 uas_eh_abort_handler 0 uas-tag 14 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#13 CDB: Write(10) 2a 00 00 d9 80 10 00 04 00 00
[  +0,000099] sd 18:0:0:0: [sdf] tag#12 uas_eh_abort_handler 0 uas-tag 13 inflight: CMD OUT 
[  +0,000004] sd 18:0:0:0: [sdf] tag#12 CDB: Write(10) 2a 00 00 d9 7c 10 00 04 00 00
[  +0,000145] sd 18:0:0:0: [sdf] tag#11 uas_eh_abort_handler 0 uas-tag 12 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#11 CDB: Write(10) 2a 00 00 d9 78 10 00 04 00 00
[  +0,000121] sd 18:0:0:0: [sdf] tag#10 uas_eh_abort_handler 0 uas-tag 11 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#10 CDB: Write(10) 2a 00 00 d9 74 10 00 04 00 00
[  +0,000122] sd 18:0:0:0: [sdf] tag#9 uas_eh_abort_handler 0 uas-tag 10 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#9 CDB: Write(10) 2a 00 00 d9 70 10 00 04 00 00
[  +0,000101] sd 18:0:0:0: [sdf] tag#8 uas_eh_abort_handler 0 uas-tag 9 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#8 CDB: Write(10) 2a 00 00 d9 6c 10 00 04 00 00
[  +0,000143] sd 18:0:0:0: [sdf] tag#7 uas_eh_abort_handler 0 uas-tag 8 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#7 CDB: Write(10) 2a 00 00 d9 68 10 00 04 00 00
[  +0,000123] sd 18:0:0:0: [sdf] tag#6 uas_eh_abort_handler 0 uas-tag 7 inflight: CMD OUT 
[  +0,000003] sd 18:0:0:0: [sdf] tag#6 CDB: Write(10) 2a 00 00 d9 64 10 00 04 00 00
[  +0,001533] sd 18:0:0:0: [sdf] tag#5 uas_eh_abort_handler 0 uas-tag 6 inflight: CMD OUT 
[  +0,000005] sd 18:0:0:0: [sdf] tag#5 CDB: Write(10) 2a 00 00 d9 60 10 00 04 00 00
[  +0,000452] scsi host18: uas_eh_bus_reset_handler start
[  +0,115872] usb 4-1: reset SuperSpeed USB device number 4 using xhci_hcd
[  +0,021129] scsi host18: uas_eh_bus_reset_handler success

[maalis 3 22:33] sd 9:0:0:0: [sda] tag#12 uas_eh_abort_handler 0 uas-tag 13 inflight: CMD OUT 
[  +0,000008] sd 9:0:0:0: [sda] tag#12 CDB: Write(10) 2a 00 0a 6d a0 20 00 04 00 00
[  +0,000262] sd 9:0:0:0: [sda] tag#11 uas_eh_abort_handler 0 uas-tag 12 inflight: CMD OUT 
[  +0,000006] sd 9:0:0:0: [sda] tag#11 CDB: Write(10) 2a 00 0a 6d 9c 20 00 04 00 00
[  +0,000233] sd 9:0:0:0: [sda] tag#10 uas_eh_abort_handler 0 uas-tag 11 inflight: CMD OUT 
[  +0,000007] sd 9:0:0:0: [sda] tag#10 CDB: Write(10) 2a 00 0a 6d 98 20 00 04 00 00
[  +0,000251] sd 9:0:0:0: [sda] tag#9 uas_eh_abort_handler 0 uas-tag 10 inflight: CMD OUT 
[  +0,000007] sd 9:0:0:0: [sda] tag#9 CDB: Write(10) 2a 00 0a 6d 94 20 00 04 00 00
[  +0,000225] sd 9:0:0:0: [sda] tag#8 uas_eh_abort_handler 0 uas-tag 9 inflight: CMD OUT 
[  +0,000006] sd 9:0:0:0: [sda] tag#8 CDB: Write(10) 2a 00 0a 6d 90 20 00 04 00 00
[  +0,000136] sd 9:0:0:0: [sda] tag#7 uas_eh_abort_handler 0 uas-tag 8 inflight: CMD OUT 
[  +0,000006] sd 9:0:0:0: [sda] tag#7 CDB: Write(10) 2a 00 0a 6d 8c 20 00 04 00 00
[  +0,000201] sd 9:0:0:0: [sda] tag#6 uas_eh_abort_handler 0 uas-tag 7 inflight: CMD OUT 
[  +0,000004] sd 9:0:0:0: [sda] tag#6 CDB: Write(10) 2a 00 0a 6d 88 20 00 04 00 00
[  +0,000139] sd 9:0:0:0: [sda] tag#5 uas_eh_abort_handler 0 uas-tag 6 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#5 CDB: Write(10) 2a 00 0a 6d 84 20 00 04 00 00
[  +0,000122] sd 9:0:0:0: [sda] tag#4 uas_eh_abort_handler 0 uas-tag 5 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#4 CDB: Write(10) 2a 00 0a 6d 80 20 00 04 00 00
[  +0,000102] sd 9:0:0:0: [sda] tag#3 uas_eh_abort_handler 0 uas-tag 4 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#3 CDB: Write(10) 2a 00 0a 6d 7c 20 00 04 00 00
[  +0,000119] sd 9:0:0:0: [sda] tag#2 uas_eh_abort_handler 0 uas-tag 3 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#2 CDB: Write(10) 2a 00 0a 6d 78 20 00 04 00 00
[  +0,000122] sd 9:0:0:0: [sda] tag#1 uas_eh_abort_handler 0 uas-tag 2 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#1 CDB: Write(10) 2a 00 0a 6d 74 20 00 04 00 00
[  +0,000121] sd 9:0:0:0: [sda] tag#0 uas_eh_abort_handler 0 uas-tag 1 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#0 CDB: Write(10) 2a 00 0a 6d 70 20 00 04 00 00
[  +0,000123] sd 9:0:0:0: [sda] tag#26 uas_eh_abort_handler 0 uas-tag 27 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#26 CDB: Write(10) 2a 00 0a 6d 6c 20 00 04 00 00
[  +0,000144] sd 9:0:0:0: [sda] tag#25 uas_eh_abort_handler 0 uas-tag 26 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#25 CDB: Write(10) 2a 00 0a 6d 68 20 00 04 00 00
[  +0,000123] sd 9:0:0:0: [sda] tag#24 uas_eh_abort_handler 0 uas-tag 25 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#24 CDB: Write(10) 2a 00 0a 6d 64 20 00 04 00 00
[  +0,000121] sd 9:0:0:0: [sda] tag#23 uas_eh_abort_handler 0 uas-tag 24 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#23 CDB: Write(10) 2a 00 0a 6d 60 20 00 04 00 00
[  +0,000100] sd 9:0:0:0: [sda] tag#22 uas_eh_abort_handler 0 uas-tag 23 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#22 CDB: Write(10) 2a 00 0a 6d 5c 20 00 04 00 00
[  +0,000122] sd 9:0:0:0: [sda] tag#21 uas_eh_abort_handler 0 uas-tag 22 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#21 CDB: Write(10) 2a 00 0a 6d 58 20 00 04 00 00
[  +0,000121] sd 9:0:0:0: [sda] tag#20 uas_eh_abort_handler 0 uas-tag 21 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#20 CDB: Write(10) 2a 00 0a 6d 54 20 00 04 00 00
[  +0,000144] sd 9:0:0:0: [sda] tag#19 uas_eh_abort_handler 0 uas-tag 20 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#19 CDB: Write(10) 2a 00 0a 6d 50 20 00 04 00 00
[  +0,000123] sd 9:0:0:0: [sda] tag#18 uas_eh_abort_handler 0 uas-tag 19 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#18 CDB: Write(10) 2a 00 0a 6d 4c 20 00 04 00 00
[  +0,000122] sd 9:0:0:0: [sda] tag#17 uas_eh_abort_handler 0 uas-tag 18 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#17 CDB: Write(10) 2a 00 0a 6d 48 20 00 04 00 00
[  +0,000099] sd 9:0:0:0: [sda] tag#16 uas_eh_abort_handler 0 uas-tag 17 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#16 CDB: Write(10) 2a 00 0a 6d 44 20 00 04 00 00
[  +0,000144] sd 9:0:0:0: [sda] tag#15 uas_eh_abort_handler 0 uas-tag 16 inflight: CMD OUT 
[  +0,000003] sd 9:0:0:0: [sda] tag#15 CDB: Write(10) 2a 00 0a 6d 40 20 00 04 00 00
[  +0,000122] sd 9:0:0:0: [sda] tag#14 uas_eh_abort_handler 0 uas-tag 15 inflight: CMD OUT 
[  +0,000004] sd 9:0:0:0: [sda] tag#14 CDB: Write(10) 2a 00 0a 6d 3c 20 00 04 00 00
[  +0,000099] sd 9:0:0:0: [sda] tag#13 uas_eh_abort_handler 0 uas-tag 14 inflight: 
[  +0,000003] sd 9:0:0:0: [sda] tag#13 CDB: Write(10) 2a 00 0a 6d 3c 18 00 00 08 00
[  +0,000019] scsi host9: uas_eh_bus_reset_handler start
[  +0,117287] usb 4-1: reset SuperSpeed USB device number 4 using xhci_hcd
[  +0,020824] scsi host9: uas_eh_bus_reset_handler success