[Bug 1987663] Re: cinder-volume: "Failed to re-export volume, setting to ERROR" with "tgtadm: failed to send request hdr to tgt daemon, Transport endpoint is not connected" on service startup

Fri Apr 19 15:48:42 UTC 2024

The packages built successfully in Test PPA ppa:mfo/cinder-
lp1987663-lp1988942-lp1994521

All build-time unit tests passed in the Test PPA (as in the Ubuntu
Archive).

Mantic:
---

mantic-updates:

	BUILDLOG='https://launchpad.net/ubuntu/+source/cinder/2:23.0.0-0ubuntu1.1/+build/27741243/+files/buildlog_ubuntu-mantic-amd64.cinder_2%3A23.0.0-0ubuntu1.1_BUILDING.txt.gz'
	curl -sL "$BUILDLOG" -o - | gzip -dc | grep -e '^Ran .* tests' -e '^OK (skipped='

	Ran 17293 tests in 343.725s
	OK (skipped=44)

mantic test ppa:

	BUILDLOG='https://launchpadlibrarian.net/725471761/buildlog_ubuntu-mantic-amd64.cinder_2%3A23.0.0-0ubuntu1.2_BUILDING.txt.gz'
	curl -sL "$BUILDLOG" -o - | gzip -dc | grep -e '^Ran .* tests' -e '^OK (skipped='

	Ran 17293 tests in 333.393s
	OK (skipped=44)

Jammy:
---

jammy-updates:

	BUILDLOG='https://launchpad.net/ubuntu/+source/cinder/2:20.3.1-0ubuntu1.1/+build/27741270/+files/buildlog_ubuntu-jammy-amd64.cinder_2%3A20.3.1-0ubuntu1.1_BUILDING.txt.gz'
	curl -sL "$BUILDLOG" -o - | gzip -dc | grep -e '^Ran .* tests' -e '^OK (skipped='

	Ran 16048 tests in 367.044s
	OK (skipped=48)

jammy test ppa:

	BUILDLOG='https://launchpad.net/~mfo/+archive/ubuntu/cinder-lp1987663-lp1988942-lp1994521/+build/28125465/+files/buildlog_ubuntu-jammy-amd64.cinder_2%3A20.3.1-0ubuntu1.2_BUILDING.txt.gz'
	curl -sL "$BUILDLOG" -o - | gzip -dc | grep -e '^Ran .* tests' -e '^OK (skipped='

	Ran 16054 tests in 343.184s
	OK (skipped=48)

Focal:
---

focal-updates:

	BUILDLOG='https://launchpadlibrarian.net/666807464/buildlog_ubuntu-focal-amd64.cinder_2%3A16.4.2-0ubuntu2.4_BUILDING.txt.gz'
	curl -sL "$BUILDLOG" -o - | gzip -dc | sed -n -e '/^Ran:/,/^Sum of/p'

	Ran: 12772 tests in 205.1574 sec.
	 - Passed: 12760
	 - Skipped: 12
	 - Expected Fail: 0
	 - Unexpected Success: 0
	 - Failed: 0
	Sum of execute time for each test: 802.0120 sec.

focal test ppa:

	BUILDLOG='https://launchpad.net/~mfo/+archive/ubuntu/cinder-lp1987663-lp1988942-lp1994521/+build/28125762/+files/buildlog_ubuntu-focal-amd64.cinder_2%3A16.4.2-0ubuntu2.5_BUILDING.txt.gz'
	curl -sL "$BUILDLOG" -o - | gzip -dc | sed -n -e '/^Ran:/,/^Sum of/p'

	Ran: 12772 tests in 228.6830 sec.
	 - Passed: 12760
	 - Skipped: 12
	 - Expected Fail: 0
	 - Unexpected Success: 0
	 - Failed: 0
	Sum of execute time for each test: 866.5233 sec.

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https://bugs.launchpad.net/bugs/1987663

Title:
  cinder-volume: "Failed to re-export volume, setting to ERROR" with
  "tgtadm: failed to send request hdr to tgt daemon, Transport endpoint
  is not connected" on service startup

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive antelope series:
  New
Status in Ubuntu Cloud Archive bobcat series:
  New
Status in Ubuntu Cloud Archive caracal series:
  Fix Released
Status in Ubuntu Cloud Archive ussuri series:
  Incomplete
Status in Ubuntu Cloud Archive victoria series:
  Won't Fix
Status in Ubuntu Cloud Archive wallaby series:
  Won't Fix
Status in Ubuntu Cloud Archive xena series:
  Won't Fix
Status in Ubuntu Cloud Archive yoga series:
  New
Status in Ubuntu Cloud Archive zed series:
  Won't Fix
Status in cinder package in Ubuntu:
  Fix Released
Status in cinder source package in Bionic:
  Won't Fix
Status in cinder source package in Focal:
  New
Status in cinder source package in Jammy:
  New
Status in cinder source package in Lunar:
  Won't Fix
Status in cinder source package in Mantic:
  New
Status in cinder source package in Noble:
  Fix Released

Bug description:
  [Impact]

   * The cinder-volume service might fail to re-export volumes
     in-use on startup if tgt.service isn't fully started yet.

   * This affects the 'lvm' driver with 'tgtadm' target helper
     (which runs 'tgtadm' commands that need the service ready).

   * Snippets from /var/log/cinder/cinder-volume.log:

     Failed to re-export volume, setting to ERROR.
     ...
     Command: tgtadm --lld iscsi --op show --mode target
     ...
     Stderr: 'tgtadm: failed to send request hdr to tgt daemon,
     Transport endpoint is not connected\n'

   * This issue is more common in openstack compute nodes
     with networking (ovs/ovn) that takes long to startup,
     which might delay the startup of tgt.service _after_
     cinder-volume.service.

  [Test Steps]

   * Steps to reproduce are detailed in comment #3.
     Summary:

   * Install mysql, rabbitmq-server, keystone, and cinder
     (controller and storage nodes; backup node unneeded).

   * Configure cinder-volume (storage node) for LVM backend
     and tgtadm iSCSI helper (tgt.service).

   * Create a cinder volume, and configure it as 'in-use'.

   * Simulate a start delay on tgt.service with a drop-in.

   * Restart services: cinder-volume.service tgt.service

   * Check sequence of service startup.

   * Check status of the cinder volume:
     'in-use' (expected) or 'error' (bug).

   * Check log file /var/log/cinder/cinder-volume.log for
     'tgtadm: failed to send request hdr to tgt daemon'.

  [Regression Potential]

   * The fix introduces systemd unit 'After=' and 'Wants='
     properties for tgt.service in cinder-volume.service,
     thus might delay the boot process (multi-user.target).

       $ systemctl show cinder-volume.service | grep WantedBy=
       WantedBy=multi-user.target

   * However, the boot process already waits on tgt.service
     anyway, thus the difference (if any) should not be big,
     and would provide more correct behavior.

       $ systemctl show tgt.service | grep WantedBy=
       WantedBy=multi-user.target

   * If tgt.service is not present (tgt package not installed)
     _no errors_ occur, as both 'After=' and 'Wants=' are weak
     ordering/dependency properties (man 5 systemd.unit).

  [Other Info]

   * The fix uses a systemd service drop-in snippet because
     the service unit is generated by openstack-pkg-tools
     (pkgos-gen-systemd-unit) based on the 'init' service,
     and it only emits 'Wants=' for network-online.target.

   * Changing that in openstack-pkg-tools changes behavior
     in stable releases, and only manifest at build time,
     for many openstack packages that have no issues now.

   * We'll continue to pursue the general improvement in
     Debian, so it comes into Ubuntu development release,
     but for the Ubuntu stable releases, this should do.

  [Original Bug Description]

  Real-world example in comment #2.

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