The release of this SRU has been rolled back in jammy because of bug
#2035406 which appears to be a regression introduced in the new version
of systemd.
** Changed in: systemd (Ubuntu Jammy)
Status: Fix Released => Triaged
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https://bugs.launchpad.net/bugs/1999275
Title:
systemd-binfmt.service fails in tests-in-lxd
Status in systemd package in Ubuntu:
Fix Released
Status in systemd source package in Jammy:
Triaged
Bug description:
[Impact]
systemd-binfmt.service fails in LXD because access
/proc/sys/binfmt_misc is prevented by LXD apparmor config. This causes
our autopkgtest to fail, and leaves systemd-binfmt.service in a failed
state:
root@jammy:~# systemctl status systemd-binfmt
× systemd-binfmt.service - Set Up Additional Binary Formats
Loaded: loaded (/lib/systemd/system/systemd-binfmt.service; static)
Active: failed (Result: exit-code) since Thu 2023-08-17 18:54:18 UTC;
1min 12s ago
Docs: man:systemd-binfmt.service(8)
man:binfmt.d(5)
https://www.kernel.org/doc/html/latest/admin-guide/binfmt-misc.html
https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
Main PID: 118 (code=exited, status=1/FAILURE)
CPU: 5ms
Aug 17 18:54:18 jammy systemd[1]: Starting Set Up Additional Binary Formats...
Aug 17 18:54:18 jammy systemd-binfmt[118]: Failed to add binary format:
Permission denied
Aug 17 18:54:18 jammy systemd[1]: systemd-binfmt.service: Main process
exited, code=exited, status=1/FAILURE
Aug 17 18:54:18 jammy systemd[1]: systemd-binfmt.service: Failed with result
'exit-code'.
Aug 17 18:54:18 jammy systemd[1]: Failed to start Set Up Additional Binary
Formats.
[Test Plan]
1. test_no_failed from boot-and-services should pass.
2. Manual test:
* Start a Jammy LXD container:
$ lxc launch ubuntu-daily:jammy jammy
$ lxc exec jammy bash
* In the container, check systemd-binfmt.service:
root@jammy:~# systemctl status systemd-binfmt
● systemd-binfmt.service - Set Up Additional Binary Formats
Loaded: loaded (/lib/systemd/system/systemd-binfmt.service; static)
Drop-In: /etc/systemd/system/systemd-binfmt.service.d
└─override.conf
Active: active (exited) since Thu 2023-08-17 19:01:00 UTC; 2min 27s ago
Docs: man:systemd-binfmt.service(8)
man:binfmt.d(5)
https://www.kernel.org/doc/html/latest/admin-guide/binfmt-misc.html
https://www.freedesktop.org/wiki/Software/systemd/APIFileSystems
Main PID: 122 (code=exited, status=0/SUCCESS)
CPU: 5ms
Aug 17 19:01:00 jammy systemd[1]: Starting Set Up Additional Binary Formats...
Aug 17 19:01:00 jammy systemd[1]: Finished Set Up Additional Binary Formats.
root@jammy:~# journalctl -t systemd-binfmt -b
Aug 17 19:01:00 jammy systemd-binfmt[122]: /proc/sys/fs/binfmt_misc is not
mounted in read-write mode, skipping.
[ Where problems could occur]
The patches are contained to binfmt logic in systemd, and so any
regressions would be within systemd-binfmt itself. The patches make it
so that systemd-binfmt checks if /proc/sys/binfmt_misc is mounted as
rw before trying to make any changes. If it is mounted, but read-only,
then systemd-binfmt will exit cleanly and log a message indicating so.
If the patch was incorrect, it could make it so that systemd-binfmt is
not fully executed on systems where it should be.
[Original Description]
The systemd-binfmt.service requires read-write access to
/proc/sys/fs/binfmt_misc, but this is not possible in unprivileged LXD
containers without binfmt_misc namespace support in the kernel [1].
When this service is triggered, we get the following failure from
test_no_failed within tests-in-lxd:
No failed units ... -------- journal for failed service
systemd-binfmt.service -----------
Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd[1]: Starting Set Up Additional
Binary Formats...
Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd-binfmt[99]: Failed to flush
binfmt_misc rules, ignoring: Permission denied
Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd-binfmt[99]:
/usr/lib/binfmt.d/python3.10.conf:1: Failed to delete rule 'python3.10',
ignoring: Permission denied
Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd-binfmt[99]:
/usr/lib/binfmt.d/python3.10.conf:1: Failed to add binary format 'python3.10':
Permission denied
Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd[1]: systemd-binfmt.service:
Main process exited, code=exited, status=1/FAILURE
Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd[1]: systemd-binfmt.service:
Failed with result 'exit-code'.
Dec 08 10:43:37 autopkgtest-lxd-qicaxl systemd[1]: Failed to start Set Up
Additional Binary Formats.
FAIL
test_rsyslog (__main__.ServicesTest) ... ok
test_tmp_cleanup (__main__.ServicesTest) ... ok
test_tmp_mount (__main__.ServicesTest) ... ok
test_udev (__main__.ServicesTest) ... skipped 'udev does not work in
containers'
======================================================================
FAIL: test_no_failed (__main__.ServicesTest)
No failed units
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/tmp/autopkgtest.METFVA/build.LjB/real-tree/debian/tests/boot-and-services",
line 74, in test_no_failed
self.assertEqual(failed, [])
AssertionError: Lists differ: ['systemd-binfmt.service loaded failed failed
Set Up Additional Binary Formats'] != []
First list contains 1 additional elements.
First extra element 0:
'systemd-binfmt.service loaded failed failed Set Up Additional Binary Formats'
- ['systemd-binfmt.service loaded failed failed Set Up Additional Binary
Formats']
+ []
The systemd-binfmt.service is only started if there is a configuration
to be loaded from one of the valid configuration directories (e.g.
/usr/lib/binfmt.d/python3.10.conf). Previously, no such file was
installed in the test LXD images, but a recent upload of python3.10
added support for systemd-binfmt [2].
[1]
https://discuss.linuxcontainers.org/t/3-1-0-binfmt-support-service-in-unprivileged-guest-requires-write-access-on-hosts-proc-sys-fs-binfmt-misc/5249
[2]
https://launchpadlibrarian.net/632281245/python3.10_3.10.8-1_3.10.8-3.diff.gz
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