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[Launchpad Bug Tracker <1569925@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package linux - 4.15.0-10.11

---------------
linux (4.15.0-10.11) bionic; urgency=medium

  * linux: 4.15.0-10.11 -proposed tracker (LP: #1749250)

  * "swiotlb: coherent allocation failed" dmesg spam with linux 4.15.0-9.10
    (LP: #1749202)
    - swiotlb: suppress warning when __GFP_NOWARN is set
    - drm/ttm: specify DMA_ATTR_NO_WARN for huge page pools

  * linux-tools: perf incorrectly linking libbfd (LP: #1748922)
    - SAUCE: tools -- add ability to disable libbfd
    - [Packaging] correct disablement of libbfd

  * [Artful] Realtek ALC225: 2 secs noise when a headset plugged in
    (LP: #1744058)
    - ALSA: hda/realtek - update ALC225 depop optimize

  * [Artful] Support headset mode for DELL WYSE (LP: #1723913)
    - SAUCE: ALSA: hda/realtek - Add support headset mode for DELL WYSE

  * headset mic can't be detected on two Dell machines (LP: #1748807)
    - ALSA: hda/realtek - Support headset mode for ALC215/ALC285/ALC289
    - ALSA: hda - Fix headset mic detection problem for two Dell machines

  * Bionic update to v4.15.3 stable release (LP: #1749191)
    - ip6mr: fix stale iterator
    - net: igmp: add a missing rcu locking section
    - qlcnic: fix deadlock bug
    - qmi_wwan: Add support for Quectel EP06
    - r8169: fix RTL8168EP take too long to complete driver initialization.
    - tcp: release sk_frag.page in tcp_disconnect
    - vhost_net: stop device during reset owner
    - ipv6: addrconf: break critical section in addrconf_verify_rtnl()
    - ipv6: change route cache aging logic
    - Revert "defer call to mem_cgroup_sk_alloc()"
    - net: ipv6: send unsolicited NA after DAD
    - rocker: fix possible null pointer dereference in
      rocker_router_fib_event_work
    - tcp_bbr: fix pacing_gain to always be unity when using lt_bw
    - cls_u32: add missing RCU annotation.
    - ipv6: Fix SO_REUSEPORT UDP socket with implicit sk_ipv6only
    - soreuseport: fix mem leak in reuseport_add_sock()
    - net_sched: get rid of rcu_barrier() in tcf_block_put_ext()
    - net: sched: fix use-after-free in tcf_block_put_ext
    - media: mtk-vcodec: add missing MODULE_LICENSE/DESCRIPTION
    - media: soc_camera: soc_scale_crop: add missing
      MODULE_DESCRIPTION/AUTHOR/LICENSE
    - media: tegra-cec: add missing MODULE_DESCRIPTION/AUTHOR/LICENSE
    - gpio: uniphier: fix mismatch between license text and MODULE_LICENSE
    - crypto: tcrypt - fix S/G table for test_aead_speed()
    - Linux 4.15.3

  * bnx2x_attn_int_deasserted3:4323 MC assert! (LP: #1715519) //
    CVE-2018-1000026
    - net: create skb_gso_validate_mac_len()
    - bnx2x: disable GSO where gso_size is too big for hardware

  * ethtool -p fails to light NIC LED on HiSilicon D05 systems (LP: #1748567)
    - net: hns: add ACPI mode support for ethtool -p

  * CVE-2017-5715 (Spectre v2 Intel)
    - [Packaging] retpoline files must be sorted
    - [Packaging] pull in retpoline files

  * [Feature] PXE boot with Intel Omni-Path (LP: #1712031)
    - d-i: Add hfi1 to nic-modules

  * CVE-2017-5715 (Spectre v2 retpoline)
    - [Packaging] retpoline -- add call site validation
    - [Config] disable retpoline checks for first upload

  * Do not duplicate changelog entries assigned to more than one bug or CVE
    (LP: #1743383)
    - [Packaging] git-ubuntu-log -- handle multiple bugs/cves better

 -- Seth Forshee <seth.forshee@xxxxxxxxxxxxx>  Tue, 13 Feb 2018 11:33:58
-0600

** Changed in: linux (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

** CVE added: https://cve.mitre.org/cgi-
bin/cvename.cgi?name=2018-1000026

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1569925

Title:
  Shutdown hang on 16.04 with iscsi targets

Status in linux package in Ubuntu:
  Fix Released
Status in open-iscsi package in Ubuntu:
  Opinion
Status in linux source package in Trusty:
  Fix Committed
Status in open-iscsi source package in Trusty:
  Opinion
Status in linux source package in Xenial:
  Fix Released
Status in open-iscsi source package in Xenial:
  Opinion
Status in linux source package in Artful:
  Fix Released
Status in open-iscsi source package in Artful:
  Opinion
Status in linux source package in Bionic:
  Fix Released
Status in open-iscsi source package in Bionic:
  Opinion

Bug description:
  [Impact]

   * open-iscsi users might face hangs during OS shutdown.
   * hangs can be caused by manual iscsi configuration/setup.
   * hangs can also be caused by bad systemd unit ordering.
   * if transport layer interface vanishes before lun is
     disconnected, then the hang will happen.
   * check comment #89 for the fix decision.
   
  [Test Case]

   * a simple way of reproducing the kernel hang is to disable
     the open-iscsi logouts. this simulates a situation when
     a service has shutdown the network interface, used by
     the transport layer, before proper iscsi logout was done.

     $ log into all iscsi luns
    
     $ systemctl edit --full open-iscsi.service
     ...
     #ExecStop=/lib/open-iscsi/logout-all.sh
     ...
    
     $ sudo reboot # this will make server to hang forever
                   # on shutdown

  [Regression Potential]

   * the regression is low because the change acts on the iscsi
     transport layer code ONLY when the server is in shutdown 
     state.

   * any error in logic would only appear during shutdown and
     would not cause any harm to data.

  [Other Info]
   
   * ORIGINAL 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).

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