2 things for previous comment #75: 1) I pasted wrong pastebin URL. I'll describe the fix: its a service unit file that runs at the end of shutdown, right before it, re-using /run (tmpfs). Service has a preparation script that copies binaries from initrd image - so there is a minimum execution environment available - and runs the second script. Second script initializes iscsid daemon and waits in a loop for all the portals to be ONLINE and existing sessions to be LOGGED. After that it does the logout on all existing sessions (this case this would be leftovers from my previous comment AND / root disks).
2) I tested this approach and it works good for iscsi root disks because there is a network interface that stays connected all the time. In the case of leftovers from previous unsuccessful umount attempts, the network.target would be already gone (with networkd / ifupdown interfaces already shutdown). IF I keep my interfaces configured, then this approach works for root disks AND for leftovers. For this approach to be successful for this case, this "cleanup" service would have to raise existing interfaces up again for the iscsid to login and logout to work (OR the kernel hang be resolved, then leftovers would be just left there, without logouts). -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1569925 Title: Shutdown hang on 16.04 with iscsi targets Status in linux package in Ubuntu: In Progress Status in open-iscsi package in Ubuntu: In Progress Status in linux source package in Xenial: In Progress Status in open-iscsi source package in Xenial: In Progress Status in linux source package in Zesty: In Progress Status in open-iscsi source package in Zesty: In Progress Status in linux source package in Artful: In Progress Status in open-iscsi source package in Artful: In Progress Bug description: I have 4 servers running the latest 16.04 updates from the development branch (as of right now). Each server is connected to NetApp storage using iscsi software initiator. There are a total of 56 volumes spread across two NetApp arrays. Each volume has 4 paths available to it which are being managed by device mapper. While logged into the iscsi sessions all I have to do is reboot the server and I get a hang. I see a message that says: "Reached target Shutdown" followed by "systemd-shutdown[1]: Failed to finalize DM devices, ignoring" and then I see 8 lines that say: "connection1:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4311815***, last ping 43118164**, now 4311817***" "connection2:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4311815***, last ping 43118164**, now 4311817***" "connection3:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4311815***, last ping 43118164**, now 4311817***" "connection4:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4311815***, last ping 43118164**, now 4311817***" "connection5:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4311815***, last ping 43118164**, now 4311817***" "connection6:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4311815***, last ping 43118164**, now 4311817***" "connection7:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4311815***, last ping 43118164**, now 4311817***" "connection8:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4311815***, last ping 43118164**, now 4311817***" NOTE: the actual values of the *'s differ for each line above. This seems like a bug somewhere but I am unaware of any additional logging that I could turn on to pinpoint the problem. Note I also have similar setups that are not doing iscsi and they don't have this problem. Here is a screenshot of what I see on the shell when I try to reboot: (https://launchpadlibrarian.net/291303059/Screenshot.jpg) This is being tracked in NetApp bug tracker CQ number 860251. If I log out of all iscsi sessions before rebooting then I do not experience the hang: iscsiadm -m node -U all We are wondering if this could be some kind of shutdown ordering problem. Like the network devices have already disappeared and then iscsi tries to perform some operation (hence the ping timeouts). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1569925/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
