[Bug 1829860] Update Released

[Łukasz Zemczak]

The verification of the Stable Release Update for apt has completed
successfully and the package has now been released to -updates.
Subsequently, the Ubuntu Stable Release Updates Team is being
unsubscribed and will not receive messages about this bug report.  In
the event that you encounter a regression using the package from
-updates please report a new bug using ubuntu-bug and tag the bug report
regression-update so we can easily find any regressions.

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https://bugs.launchpad.net/bugs/1829860

Title:
  APT unlocks in same order as it locks

Status in apt package in Ubuntu:
  Fix Released
Status in apt source package in Xenial:
  New
Status in apt source package in Bionic:
  Fix Released
Status in apt source package in Disco:
  Fix Released

Bug description:
  [Impact]
  APT releases the locks in the same order it acquires them, rather than reverse order. Given that we have no waiting for locks, this is not _super_ problematic, but it might be wrong: You'd get a lock failure on dpkg's lock, rather than lock-frontend.

  [Test case]
  Watch lock release with strace and see that it unlocks the right way.

  [Regression potential]
  Some other locking races or something?

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