#regzbot introduced: 44c57f205876 I have several different QLogic FC HBAs (8, 16, 32 Gbps) and several different FC LTO tape drives (IBM Ultrium 8 & 9). When I plug in the FC cable, the tape drive shows up as a SCSI device as expected. With older kernels, when I unplug the FC cable, the tape drive SCSI device would disappear after about 30 seconds. But with newer kernels (including 5.18), when I unplug the FC cable, the tape drive SCSI device never disappears. I have bisected the change in behavior to the following commit in kernel 5.15: 44c57f205876 ("scsi: qla2xxx: Changes to support FCP2 Target") This commit has been backported to various -stable kernels, so they are also affected. When testing with two different tape drives: 1) Plug FC cable into tape drive A. Tape drive A shows up as a SCSI device. 2) Unplug FC cable; wait 60 seconds. Tape drive A does not disappear. 3) Plug FC cable into tape drive B. Tape drive A disappears 30 seconds later, but tape drive B does not show up. 4) Unplug FC cable and plug it back into tape drive B. Tape drive B shows up as a SCSI device. So I can actually make a tape drive disappear by plugging the cable into a different tape drive, but then I have to reseat the cable again to make the new tape drive show up. lspci -n 83:00.0 0c04: 1077:2031 (rev 02) 83:00.1 0c04: 1077:2031 (rev 02) When plugging in cable: qla2xxx [0000:83:00.1]-500a:7: LOOP UP detected (8 Gbps). When unplugging cable with old kernel: qla2xxx [0000:83:00.1]-500b:7: LOOP DOWN detected (2 7 0 0). rport-7:0-2: blocked FC remote port time out: removing target and saving binding When unplugging cable with new kernel: qla2xxx [0000:83:00.1]-500b:7: LOOP DOWN detected (2 7 0 0). /sys/class/fc_remote_ports/rport-*/ dev_loss_tmo: 30 supported_classes: Class 3 port_state: Online (port_state remains Online even when FC cable unplugged) /proc/scsi/scsi Host: scsi7 Channel: 00 Id: 01 Lun: 00 Vendor: IBM Model: ULTRIUM-HH8 Rev: K4K1 Type: Sequential-Access ANSI SCSI revision: 06 Tony Battersby Cybernetics