@Gustavo, Liang's comment in patch set 3 [1] can explain your problem, he said:
The dev can disappear momentarily right after 'multipath -r "dev"'. So it doesn't happen for every single path. If it did, it would cause a lot more issues. The multipath dev removal path reloads the dev near the beginning of the operation (_rescan_multipath). Thus the "stat" here can fail if it is executed before the dev node being re-created. 1, 'multipath -r' in _rescan_multipath() [10] can make the multipath dev disappear momentarily [9] due to the bug [9]. 2, _get_multipath_device_name() [2] uses 'multipath -ll' command to find multipath device name [3], so we saw: Jan 25 09:24:40 Lock "connect_volume" acquired by "os_brick.initiator.connector.disconnect_volume" :: waited 0.000s ... Jan 25 09:24:40 multipath ['-ll', u'/dev/sdr']: stdout=360080e5000297ea40000050658885f45 dm-6 NETAPP,INF-01-00#012 3, _linuxscsi.remove_multipath_device() [4] will invoke remove_multipath_device() [4], so we saw: Jan 25 09:24:40 remove multipath device /dev/sdr' 4, then find_multipath_device() will be invoked [5], then 'multipath -l' will be invoked [6] 5, the "stat" right after 'multipath -r' here [7] can fail if it is executed before the dev node being re-created. so we saw: Jan 25 09:24:40 Couldn't find multipath device /dev/mapper/360080e5000297ea40000050658885f45 So the fix [1] was trying to fix this problem, but it was abandoned later because we already have the fix [8], that's also why I am trying to backport it. FYI, the root cause of your problem is a bug in multipath-tools [9], you can also fix the problem by upgrading multipath-tools. [1] https://review.openstack.org/#/c/366065 [2] https://github.com/openstack/os-brick/blob/stable/mitaka/os_brick/initiator/connector.py#L925 [3] https://github.com/openstack/os-brick/blob/stable/mitaka/os_brick/initiator/connector.py#L1200 [4] https://github.com/openstack/os-brick/blob/stable/mitaka/os_brick/initiator/connector.py#L935 [5] https://github.com/openstack/os-brick/blob/stable/mitaka/os_brick/initiator/linuxscsi.py#L124 [6] https://github.com/openstack/os-brick/blob/stable/mitaka/os_brick/initiator/linuxscsi.py#L263 [7] https://github.com/openstack/os-brick/blob/stable/mitaka/os_brick/initiator/linuxscsi.py#L288 [8] https://review.openstack.org/#/c/374421/ [9] https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1621340 [10] https://github.com/openstack/os-brick/blob/stable/mitaka/os_brick/initiator/connector.py#L918 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1623700 Title: [SRU] multipath iscsi does not logout of sessions on xenial To manage notifications about this bug go to: https://bugs.launchpad.net/cloud-archive/+bug/1623700/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
