** Description changed:
+ [Impact]
+
+ * Unattended-upgrades fails to autoremove packages after installing
+ updates or fails to install updates due to a parallel process acquiring
+ apt or dpkg lock while u-u is running.
+
+ [Test Case]
+
+ * Set up a system with packages (> 30) to be upgraded. In case of
+ Bionic -security has a low number of updates, thus set up the system to
+ install -updates to have more packages for u-u to upgrade:
+
+ echo 'Unattended-Upgrade::Allowed-Origins::
+ "${distro_id}:${distro_codename}-updates";' >
+ /etc/apt/apt.conf.d/51-updates
+
+ * Set up two shells to run commands in parallel
+ * In shell "A" run sudo apt update && sudo unattended-upgrade --dry-run
--verbose --debug
+ * After u-u started run the following command in shell "B":
+ while sleep 1; do python3 -c 'import apt; import apt_pkg;
print(apt_pkg.pkgsystem_lock())' ; done
+ * Observe the following exception repeated while running u-u and True being
printed after u-u is finished:
+ ...
+ Traceback (most recent call last):
+ File "<string>", line 1, in <module>
+ apt_pkg.Error: E:Could not get lock /var/lib/dpkg/lock - open (11: Resource
temporarily unavailable), E:Unable to lock the administration directory
(/var/lib/dpkg/), is another process using it?
+ Traceback (most recent call last):
+ File "<string>", line 1, in <module>
+ apt_pkg.Error: E:Could not get lock /var/lib/dpkg/lock - open (11: Resource
temporarily unavailable), E:Unable to lock the administration directory
(/var/lib/dpkg/), is another process using it?
+ True
+ Traceback (most recent call last):
+ File "<string>", line 1, in <module>
+ apt_pkg.Error: E:Could not get lock /var/lib/dpkg/lock - open (11: Resource
temporarily unavailable), E:Unable to lock the administration directory
(/var/lib/dpkg/), is another process using it?
+ True
+ True
+ True
+ True
+ ...
+
+ [Regression Potential WIP]
+
+ * Unattended-upgrade may crash
+
+ [Original Bug Text]
+
The Ubuntu Error Tracker has been receiving reports about a problem
regarding unattended-upgrades. This problem was most recently seen with
version 0.90, the problem page at
https://errors.ubuntu.com/problem/19f99745d7dce5aea118eb31bfffcbdcdf238c4f
contains more details.
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https://bugs.launchpad.net/bugs/1602536
Title:
/usr/bin/unattended-upgrade:apt.cache.LockFailedException:/usr/bin
/unattended-
upgrade@1468:main:do_auto_remove:cache_commit:commit:_fetch_archives
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