[Bug 1829860] Autopkgtest regression report (apt/1.6.12)

[Ubuntu SRU Bot]

All autopkgtests for the newly accepted apt (1.6.12) for bionic have finished running.
The following regressions have been reported in tests triggered by the package:

sbuild/0.75.0-1ubuntu1 (ppc64el)
apport/2.20.9-0ubuntu7.7 (amd64, i386)


Please visit the excuses page listed below and investigate the failures, proceeding afterwards as per the StableReleaseUpdates policy regarding autopkgtest regressions [1].

https://people.canonical.com/~ubuntu-archive/proposed-
migration/bionic/update_excuses.html#apt

[1] https://wiki.ubuntu.com/StableReleaseUpdates#Autopkgtest_Regressions

Thank you!

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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 Committed
Status in apt source package in Disco:
  Fix Committed

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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