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[Launchpad Bug Tracker <1887744@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package systemd - 245.4-4ubuntu3.6

---------------
systemd (245.4-4ubuntu3.6) focal; urgency=medium

  * debian/patches/lp1916485-Newer-Glibc-use-faccessat2-to-implement-faccessat.patch:
    Add support for faccessat2 (LP: #1916485)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=affb2c6507dccfeed02820a2267639648e2a2260
  * d/p/lp1918696-shared-seccomp-util-address-family-filtering-is-brok.patch:
    Stop attempting to restrict address families on ppc archs
    (LP: #1918696)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=daff4b6604362fcb5d305682216d5ca15a4c5738
  * d/p/lp1891810-seccomp-util-add-new-syscalls-from-kernel-5.6-to-sys.patch:
    Add openat2() syscall to seccomp filter list
    (LP: #1891810)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=69c8a684e2513b2f6530e5a5cf15c83abfb7bc74
  * d/p/lp1915887-Downgrade-a-couple-of-warnings-to-debug.patch:
    Downgrade some log messages so they stop spamming logs
    (LP: #1915887)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=3c2c4731b90ed430ca1790270e69cd125643b94b
  * d/p/lp1887744-basic-unit-file-when-loading-linked-unit-files-use-l.patch:
    Use src name, not dst name, of symlinked unit files (LP: #1887744)
    https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=03770601097cfdc09adeadf5593083da69345409

 -- Dan Streetman <ddstreet@xxxxxxxxxxxxx>  Wed, 17 Mar 2021 17:36:08
-0400

** Changed in: systemd (Ubuntu Focal)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1887744

Title:
  systemd dumps core on starting service: Assertion 'u->instance' failed
  at src/core/load-fragment.c:4798

Status in systemd:
  Fix Released
Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Xenial:
  Invalid
Status in systemd source package in Bionic:
  Invalid
Status in systemd source package in Focal:
  Fix Released
Status in systemd source package in Groovy:
  Fix Released
Status in systemd source package in Hirsute:
  Fix Released

Bug description:
  [impact]

  if a non-template service file is created as a symlink to a template
  service file outside the normal unit file paths, systemd will fail
  assertion and crash

  [test case]

  su -
  cat <<EOF > /crashsystemd@.service
  [Unit]
  Description=Template for instance %i

  [Service]
  ExecStart=/bin/true
  EOF

  cd /etc/systemd/system
  ln -s /crashsystemd@.service crashsystemd.service
  systemctl daemon-reload
  systemctl start crashsystemd

  [regression potential]

  any regression would likely cause a failed assertion and crash, or
  failure to properly parse and/or load a service file that is a symlink

  [scope]

  this is needed in f/g/h

  this is fixed upstream by commit
  3aa57658434e7a95c6000bebb166c31f1c6d051b which is included in
  v248-rc1, so this is not fixed in any release yet

  this was introduced by the changes in commit e8630e69523 which was
  first included in v243, so this bug doesn't exist in b or earlier

  [original description]

  On an Ubuntu 20.04 server, when I started a newly installed systemd
  service 'systemctl start testemail2jira.service', systemd trips on an
  assertion (from journalctl):

  Jul 16 13:49:12 pangolin-jiraconf systemd[1]: Assertion 'u->instance' failed at src/core/load-fragment.c:4798, function unit_load_fragment(). Aborting.
  Jul 16 13:49:13 pangolin-jiraconf systemd[1]: Caught <ABRT>, dumped core as pid 2906637.
  Jul 16 13:49:13 pangolin-jiraconf systemd[1]: Freezing execution.

  apport generates a core dump which I trust is attached.

  The server still works, but my terminal keeps showing:

  Failed to get properties: Failed to activate service
  'org.freedesktop.systemd1': timed out (service_start_timeout=25000ms)

  and pauses for 25s after each command.

  In case it's relevant, the <service> i was trying to start had just
  been symlinked into /etc/systemd/system/:

  root@pangolin-jiraconf # ls -la /etc/systemd/system/testemail2jira.service
  lrwxrwxrwx 1 root root 82 Jul 16 13:48 /etc/systemd/system/testemail2jira.service -> /opt/atlassian/jira/current/emailprocessing/testemail2jira/testemail2jira@.service

  File contents:

  [Unit]
  Description=Check that email to %i JIRA works

  [Service]
  #Type=oneshot
  # Note: I keep the config file, testemail2jira.json5 and rsa.* files in emailprocessing/, one directory below testemail2jira/, so that they can be version-controlled independently.
  # If you want testemail2jira.json5 and rsa.* within testemail2jira/, then add testemail2jira/ to WorkingDirectory and remove it from the ExecStart command
  WorkingDirectory=/opt/atlassian/%i/current/emailprocessing
  ExecStart=/opt/atlassian/%i/current/emailprocessing/testemail2jira/venv/bin/python testemail2jira/testemail2jira.py
  User=root

  [Install]
  WantedBy=multi-user.target

  Perhaps the problem is that my service file is a template
  (testemail2jira@.service), but I symlinked it as a regular
  'testemail2jira.service'.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: systemd 245.4-4ubuntu3.1
  ProcVersionSignature: Ubuntu 5.4.0-39.43-generic 5.4.41
  Uname: Linux 5.4.0-39-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu27.3
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Thu Jul 16 14:13:06 2020
  InstallationDate: Installed on 2020-05-27 (49 days ago)
  InstallationMedia: Ubuntu-Server 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  Lsusb-t:

  Lsusb-v: Error: command ['lsusb', '-v'] failed with exit code 1:
  MachineType: QEMU Standard PC (Q35 + ICH9, 2009)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-39-generic root=/dev/sda ro console=ttyS0,19200n8 net.ifnames=0
  SourcePackage: systemd
  SystemdFailedUnits: Error: command ['systemctl', 'status', '--full', 'Error:'] failed with exit code 1: Failed to get properties: Failed to activate service 'org.freedesktop.systemd1': timed out (service_start_timeout=25000ms)
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/01/2014
  dmi.bios.vendor: SeaBIOS
  dmi.bios.version: rel-1.12.0-0-ga698c8995f-prebuilt.qemu.org
  dmi.chassis.type: 1
  dmi.chassis.vendor: QEMU
  dmi.chassis.version: pc-q35-3.1
  dmi.modalias: dmi:bvnSeaBIOS:bvrrel-1.12.0-0-ga698c8995f-prebuilt.qemu.org:bd04/01/2014:svnQEMU:pnStandardPC(Q35+ICH9,2009):pvrpc-q35-3.1:cvnQEMU:ct1:cvrpc-q35-3.1:
  dmi.product.name: Standard PC (Q35 + ICH9, 2009)
  dmi.product.version: pc-q35-3.1
  dmi.sys.vendor: QEMU

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