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Description of problem: Could not stop tgtd service when backstore device was having timeout. Version-Release number of selected component (if applicable): scsi-target-utils-1.0.24-16.el6.x86_64 How reproducible: 100% Steps to Reproduce: 1. Use scsi_debug as backstore device # modprobe scsi_debug scsi_level=1 dev_size_mb=100 # lsscsi [1:0:0:0] cd/dvd TSSTcorp CD-ROM TS-H192C B504 /dev/sr0 [7:0:0:0] disk Linux scsi_debug 0004 /dev/sda # cat /etc/tgt/targets.conf default-driver iscsi <target iqn.2009-10.com.redhat:storage-1> write-cache off allow-in-use yes <direct-store /dev/sda> </direct-store> </target> 2. Start tgtd service # service tgtd restart 3. Discover iSCSI target # iscsiadm -m discovery -I default -p 127.0.0.1 -t st 4. Login to target # iscsiadm -m node -l 5. Set timeout on scsi_debug device # echo 4 > /sys/bus/pseudo/drivers/scsi_debug/opts # echo 1 > /sys/bus/pseudo/drivers/scsi_debug/every_nth 6. Try to perform IO using the iSCSI device # dd if=/dev/sdb of=/dev/null dd: reading `/dev/sdb': Input/output error 40+0 records in 40+0 records out 20480 bytes (20 kB) copied, 90.5412 s, 0.2 kB/s 6. Logout from iSCSI device # iscsiadm -m node -u 7. Remove iSCSI discovery information # iscsiadm -m discoverydb --portal "127.0.0.1" -t sendtargets -o delete 8. Stop tgtd # service tgtd stop Actual results: # service tgtd stop Stopping SCSI target daemon: initiators still connected[FAILED] # service tgtd force-stop Force-stopping SCSI target daemon: tgtadm: this target is still active Command: tgtadm -C 0 --mode target --op delete --tid=1 exited with code: 22. tgtadm: invalid request [FAILED] # tgtadm --lld iscsi -m target -o show Target 1: iqn.2009-10.com.redhat:storage-1 System information: Driver: iscsi State: offline I_T nexus information: I_T nexus: 1 Initiator: iqn.1994-05.com.redhat:tcp-general Connection: 0 IP Address: 127.0.0.1 LUN information: LUN: 0 Type: controller SCSI ID: IET 00010000 SCSI SN: beaf10 Size: 0 MB, Block size: 1 Online: Yes Removable media: No Prevent removal: No Readonly: No Backing store type: null Backing store path: None Backing store flags: LUN: 1 Type: disk SCSI ID: IET 00010001 SCSI SN: 8000 Size: 105 MB, Block size: 512 Online: Yes Removable media: No Prevent removal: No Readonly: No Backing store type: rdwr Backing store path: /dev/sda Backing store flags: Account information: ACL information: