This bug was fixed in the package dpkg - 1.18.4ubuntu1.5
---------------
dpkg (1.18.4ubuntu1.5) xenial; urgency=medium
* Apply patch from upstream to add frontend locking (LP: #1796081):
- Add support for frontend locking. This makes it possible for frontends
using this new protocol, to safely lock the dpkg database w/o risk of
race conditions with other dpkg instances or frontends supporting the
same protocol.
-- Julian Andres Klode <[email protected]> Thu, 04 Oct 2018 14:21:49
+0200
** Changed in: dpkg (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1796081
Title:
dpkg frontend locking
Status in dpkg package in Ubuntu:
Fix Released
Status in dpkg source package in Xenial:
Fix Released
Status in dpkg source package in Bionic:
Fix Committed
Status in dpkg source package in Cosmic:
Fix Released
Bug description:
[Impact]
Frontends of dpkg such as apt and programs using the apt libraries currently
acquire the dpkg "lock" lock file. They need to release it before running dpkg,
as dpkg also acquires it. Therefore, there is a race condition: In case the
application needs to run dpkg multiple times, another application could steal
the lock from under it, and the running application would fail in the middle of
the install, potentially rendering the system broken.
This fixes the problem by introducing an additional "lock-frontend"
file that frontends do not release when calling dpkg. When dpkg is not
called by a frontend using that file, it will try to acquire the
frontend lock as well, preventing it from interfering with such
frontends.
[Test case]
1. Hold lock, check that dpkg fails to run
2. Hold frontend lock, check that dpkg fails to run
3. Hold frontend lock, run dpkg with DPKG_FRONTEND_LOCKED set, it should
succeed
[Regression potential]
This is an isolated change adding a new lock file. Therefore, regressions can
only be expected in the form of that locking failing.
[Other info]
This is part of a wider series of SRUs for frontend locking
- dpkg (bug 1796081)
- apt (bug 1781169)
- python-apt (bug 1795407)
- packagekit (bug 1795614)
- unattended-upgrades (bug 1789637)
- aptdaemon (no bug filed yet)
Further details about frontend locking can be found in
https://lists.debian.org/debian-dpkg/2017/01/msg00044.html
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