[Stgt-devel] Open connections

[Niels de Carpentier]

I'm having an issue where old connections keep being listed in tgt, while
they are not in use anymore.

I'm running a diskless system with an iscsi root, which uses open-iscsi as
the initiator. The initrd mount does the initial mounting, and on the
final image iscsid is started, which does a reconnect.

After the system has booted, the follow status is available on the target:

Target 1: iqn.2008-04.com.test:storage.front001
    System information:
        Driver: iscsi
        Status: running
    I_T nexus information:
        I_T nexus: 1
            Initiator: front_dom0
            Connection: 0
                IP Address: 10.0.0.84
        I_T nexus: 2
            Initiator: front_dom0
            Connection: 0
                IP Address: 10.0.0.84
    LUN information:
        LUN: 0
            Type: controller
            SCSI ID: deadbeaf1:0
            SCSI SN: beaf10
            Size: 0 MB
            Online: Yes
            Poweron/Reset: Yes
            Removable media: No
            Backing store: No backing store
        LUN: 1
            Type: disk
            SCSI ID: deadbeaf1:1
            SCSI SN: beaf11
            Size: 2147 MB
            Online: Yes
            Poweron/Reset: No
            Removable media: No
            Backing store: /dev/vg_images/frontend001
        LUN: 2
            Type: disk
            SCSI ID: deadbeaf1:2
            SCSI SN: beaf12
            Size: 1074 MB
            Online: Yes
            Poweron/Reset: No
            Removable media: No
            Backing store: /dev/vg_images/frontend001_swap
    Account information:
        frontend
    ACL information:
        10.0.0.0/24

However, netstat shows only a single connection active:

netstat -an | grep 3260

tcp        0      0 0.0.0.0:3260                0.0.0.0:*                 
 LISTEN
tcp        0      0 10.0.0.17:3260              10.0.0.84:53025           
 ESTABLISHED
tcp        0      0 :::3260                     :::*                      
 LISTEN

If I reboot the iscsi root system without restarting tgtd, the initial
connect will fail. A logout and a new login is necessary to get a working
connection in this case.

The following is logged by tgtd during this time:

Mar 15 12:54:58 rbk tgtd: iscsi_task_queue(1437) unexpected cmd_sn (0,7551)
Mar 15 12:55:17 rbk tgtd: iscsi_task_queue(1437) unexpected cmd_sn (1,7551)
Mar 15 12:55:23 rbk tgtd: iscsi_task_queue(1437) unexpected cmd_sn (2,7551)
Mar 15 12:55:42 rbk tgtd: iscsi_task_queue(1437) unexpected cmd_sn (3,7551)

I can provide more information on request.

Niels de Carpentier