Public bug reported:
It looks like snapd in ubuntu-core (2.26.14 here) has been modified to
use a negative Nice value in systemd. Systemd seems to treat a failure
to apply the requested Nice value as critical to unit startup.
Unprivileged LXD containers do not allow the use of negative nice values
as those are restricted to the real root user. I believe the optimal fix
would be for systemd to ignore permission errors when attempting to
setup such custom nice values in containers but if that can't be
resolved quickly, then it means that snapd will now fail to start inside
containers.
Aug 09 05:54:37 core systemd[1]: snapd.service: Main process exited,
code=exited, status=201/NICE
Aug 09 05:54:37 core systemd[1]: snapd.service: Unit entered failed state.
Aug 09 05:54:37 core systemd[1]: snapd.service: Failed with result 'exit-code'.
I have confirmed that setting up a unit override by hand which sets Nice=0 does
resolve the problem, confirming that the negative Nice value is the problem
(snapd.service has Nice=-5 here).
** Affects: snapd
Importance: Undecided
Status: New
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags: lxd
** Also affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1709536
Title:
snapd 2.26.14 on ubuntu-core won't start in containers anymore
Status in snapd:
New
Status in systemd package in Ubuntu:
New
Bug description:
It looks like snapd in ubuntu-core (2.26.14 here) has been modified to
use a negative Nice value in systemd. Systemd seems to treat a failure
to apply the requested Nice value as critical to unit startup.
Unprivileged LXD containers do not allow the use of negative nice
values as those are restricted to the real root user. I believe the
optimal fix would be for systemd to ignore permission errors when
attempting to setup such custom nice values in containers but if that
can't be resolved quickly, then it means that snapd will now fail to
start inside containers.
Aug 09 05:54:37 core systemd[1]: snapd.service: Main process exited,
code=exited, status=201/NICE
Aug 09 05:54:37 core systemd[1]: snapd.service: Unit entered failed state.
Aug 09 05:54:37 core systemd[1]: snapd.service: Failed with result
'exit-code'.
I have confirmed that setting up a unit override by hand which sets Nice=0
does resolve the problem, confirming that the negative Nice value is the
problem (snapd.service has Nice=-5 here).
To manage notifications about this bug go to:
https://bugs.launchpad.net/snapd/+bug/1709536/+subscriptions
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