** Changed in: systemd (Ubuntu Bionic)
Assignee: (unassigned) => Dan Streetman (ddstreet)
** Changed in: systemd (Ubuntu Bionic)
Importance: Undecided => Medium
** Changed in: systemd (Ubuntu Bionic)
Status: New => In Progress
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https://bugs.launchpad.net/bugs/1905245
Title:
"Failed to parse bus message: Invalid argument" with Linux 5.8
Status in systemd package in Ubuntu:
Fix Released
Status in systemd source package in Bionic:
In Progress
Status in systemd source package in Focal:
In Progress
Bug description:
[impact]
newer kernels introduced a new capability, and existing systemd
doesn't have the name mapping for the new cap (since the mapping table
is generated at systemd compile time), so it fails when trying to map
the capability to a user-facing name, which causes failure when
running commands like 'systemctl show'
[test case]
install a focal system, and install the 5.8 (or newer) kernel, e.g.
from linux-generic-hwe-20.04-edge, and reboot into the new kernel.
Find any service that does not specify its CapabilityBoundingSet; e.g.
'apparmor', and run systemctl show on it:
ubuntu@lp1905245-f:~$ systemctl show -p CapabilityBoundingSet apparmor
Failed to parse bus message: Invalid argument
the command should correctly show the value, e.g.:
$ systemctl show -p CapabilityBoundingSet apparmor
CapabilityBoundingSet=cap_chown cap_dac_override ...etc...
[regression potential]
a regression would likely occur while systemd is parsing or printing
or otherwise handling kernel capabilities. A regression could happen
when running systemd commands, such as systemctl, or when pid1 is
managing services.
[scope]
this is needed only in focal (and possibly bionic).
This is fixed upstream by PR 16424:
https://github.com/systemd/systemd/pull/16424
which was first included in v246, so this is already fixed in groovy and
later.
this was introduced externally from systemd, with the new capability in the
kernel, so this fix technically is needed in x/b/f. However, x is unlikely to
get a new kernel capability during the rest of its life cycle.
For b, unless a kernel is added that includes a new capability, this patch is
not needed.
[original description]
When I run `systemctl show myservice.service`, I get the following
error message:
Failed to parse bus message: Invalid argument
systemd version: 245.4-4ubuntu3.3
linux version: 5.8.0-29-generic #31~20.04.1-Ubuntu (From
linux-generic-hwe-20.04-edge)
This is a bug that has been fixed in Debian. See
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=964926
Please can we port the fix to the ubuntu 20.04 version.
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