[Bug 1915678] Please test proposed package

[Corey Bryant]

Hello Takashi, or anyone else affected,

Accepted python-os-brick into stein-proposed. The package will build now
and be available in the Ubuntu Cloud Archive in a few hours, and then in
the -proposed repository.

Please help us by testing this new package. To enable the -proposed
repository:

  sudo add-apt-repository cloud-archive:stein-proposed
  sudo apt-get update

Your feedback will aid us getting this update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-stein-needed to verification-stein-done. If it does
not fix the bug for you, please add a comment stating that, and change
the tag to verification-stein-failed. In either case, details of your
testing will help us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance!

** Changed in: cloud-archive/stein
       Status: In Progress => Fix Committed

** Tags added: verification-stein-needed

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https://bugs.launchpad.net/bugs/1915678

Title:
  [SRU] iSCSI+Multipath: Volume attachment hungs if sessiong scanning
  fails

Status in Ubuntu Cloud Archive:
  Fix Released
Status in Ubuntu Cloud Archive stein series:
  Fix Committed
Status in Ubuntu Cloud Archive train series:
  Fix Committed
Status in Ubuntu Cloud Archive ussuri series:
  Fix Committed
Status in Ubuntu Cloud Archive victoria series:
  Fix Committed
Status in os-brick:
  Fix Released
Status in python-os-brick package in Ubuntu:
  Fix Released
Status in python-os-brick source package in Bionic:
  Fix Committed
Status in python-os-brick source package in Focal:
  Fix Committed
Status in python-os-brick source package in Hirsute:
  Fix Released
Status in python-os-brick source package in Impish:
  Fix Released
Status in python-os-brick source package in Jammy:
  Fix Released

Bug description:
  [Impact]

   * If some commands like "iscsiadm -m session" fail, the thread can abort immediately without updating any counters like failed_logins or stopped_threads properly, because there are no try-except block to catch exceptions.
   * The main thread keeps waiting until these counters are updated, and this results in stuck of volume attachment process.

  [Test Case]

   * Deploy Cinder with a backend that uses an iSCSI driver and configure Multipath
   * Attach a volume to an instance (first attachment for a period
   * See log line like:
  2021-12-01 00:23:24.044 2679 WARNING os_brick.initiator.connectors.iscsi [...] iscsiadm stderr output when getting sessions: iscsiadm: No active sessions.
   * Volume attachment never completes
   * Passing test: Log line appears but volume attachment succeeds.

  [Where problems could occur]

   * Change primarily introduces error handling and doesn't change implementation details.
     As such we may see an error condition logged.

  --- Original Description ---

  Currently we execute login to iscsi portals and device discovery in
  multiple threads concurrently when multipath is enabled.

  However if some commands like "iscsiadm -m session" fail, the thread can abort immediately without updating any counters like failed_logins or stopped_threads properly, because there are no try-except block to catch  exceptions.
  However the main thread keeps waiting until these counters are updated, and this results in stuck of volume attachment process.

  This issue was initially reported in downstream bug https://bugzilla.redhat.com/show_bug.cgi?id=1923975 , and maybe is caused by a bug in iscsiadm command.
  However we should handle the error more properly because current behavior requires operators to restart services like cinder-volume to resolve the stuck.

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