This bug was fixed in the package systemd - 245.5-3ubuntu1

---------------
systemd (245.5-3ubuntu1) groovy; urgency=medium

  [ Dan Streetman ]
  * Hotadd only offline memory and CPUs (LP: #1876018)
    File: debian/extra/rules-ubuntu/40-vm-hotadd.rules
    
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=dc68569fb46b04791202a40326003799becae859

  [ Balint Reczey ]
  * Merge to Ubuntu from Debian unstable
  - Dropped changes:
    * Cherry-pick fix from upstream master to adjust UseGateway= default
  * journald: stream pid change newline fix (LP: #1875708)
    Files:
    - debian/patches/debian/fsckd-daemon-for-inter-fsckd-communication.patch
    - 
debian/patches/lp1875708/journald-Increase-stdout-buffer-size-sooner-when-almost-f.patch
    - 
debian/patches/lp1875708/journald-rework-end-of-line-marker-handling-to-use-a-fiel.patch
    - debian/patches/lp1875708/journald-rework-pid-change-handling.patch
    - 
debian/patches/lp1875708/journald-use-log_warning_errno-where-appropriate.patch
    - 
debian/patches/lp1875708/journald-use-the-fact-that-client_context_release-returns.patch
    - debian/patches/lp1875708/man-document-the-new-_LINE_BREAK-type.patch
    - 
debian/patches/lp1875708/socket-util-introduce-type-safe-dereferencing-wrapper-CMS.patch
    - debian/patches/lp1875708/test-Add-a-test-case-for-15654.patch
    
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=95302fbe53202bdac33f86031aa56026444a92d3

  [ Dimitri John Ledkov ]
  * meson: initialize time-epoch to reproducible builds compatible value
    (LP: #1878969)
    File: 
debian/patches/meson-initialize-time-epoch-to-reproducible-builds-compat.patch
    
https://git.launchpad.net/~ubuntu-core-dev/ubuntu/+source/systemd/commit/?id=6785dfd98f81dfe3e3d5273511ec33b196ddb0c3

systemd (245.5-3) unstable; urgency=medium

  [ Michael Biebl ]
  * Bump priority of libnss-systemd to standard
  * logind: avoid shadow lookups when doing userdb client side
  * Disable DNSSEC support by default in resolved.
    The upstream default, DNSSEC=allow-downgrade can lead to compatibility
    issues with certain network access points. Previously, DNSSEC support
    was only turned off when built for a stable Debian release, but it is
    safer and more consistent to just generally change the default to
    DNSSEC=no. (Closes: #959996)
  * Bump debhelper compatibility level to 13.
    Use the debhelper-compat package to declare the compatibility level and
    drop debian/compat.
  * Convert to dh_installsystemd and disable dh_installsystemduser
  * Drop custom initramfs update code.
    Now handled by dh_installinitramfs which is enabled by default in compat
    level 12 and above.

  [ Dan Streetman ]
  * Cherry-pick fix from upstream master to adjust UseGateway= default
    - network: change UseGateway= default to UseRoutes= setting
    - network: honor SetDNSRoutes= even if UseGateway=False
    (LP: #1867375)

  [ Topi Miettinen ]
  * Delete empty lines at end of file.
    Upstream commit hooks don't allow empty lines and of course they serve no
    purpose.

 -- Balint Reczey <rbal...@ubuntu.com>  Tue, 19 May 2020 19:43:50 +0200

** Changed in: systemd (Ubuntu Groovy)
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1875708

Title:
  Truncated messages in journald since systemd v244

Status in libvirt package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Fix Released
Status in libvirt source package in Focal:
  New
Status in systemd source package in Focal:
  In Progress
Status in libvirt source package in Groovy:
  Invalid
Status in systemd source package in Groovy:
  Fix Released

Bug description:
  [Impact]

   * since 09d0b46a "journal: refresh cached credentials of stdout streams"
     in ~244 output may be trincated.

   * Upstream has a fix in https://github.com/systemd/systemd/pull/15685

   * Backporting the fix will avoid truncation of log output to journald

  [Test Case]

   * This could happen in any case, but is more likely when a program that 
     has output going to journald is spawning short-lived sub-programs often.
     Therefore the test emphasizes on that:

     - Use a test service like /etc/systemd/system/test.service:
  [Unit]
  Description=Test Truncate
  After=network.target

  [Service]
  ExecStart=/usr/lib/test.sh long-test-for-start
  ExecStop=/usr/lib/test.sh long-test-for-stop
  Type=oneshot
  RemainAfterExit=yes
  StandardOutput=journal+console
  TimeoutStopSec=0

  [Install]
  WantedBy=multi-user.target

     - And a test script like /usr/lib/test.sh:
  #!/bin/sh
  gettext "This will"
  echo
  gettext "usually fail"
  echo
  gettext "and be truncated"
  echo 

  Start/Stopping that service without the fix will look like:
  Apr 30 18:56:40 f systemd[1]: Stopping Test Truncate...
  Apr 30 18:56:40 f test.sh[1165]: T
  Apr 30 18:56:40 f test.sh[1167]: T
  Apr 30 18:56:40 f test.sh[1167]: sually fai
  Apr 30 18:56:40 f test.sh[1165]: s
  Apr 30 18:56:40 f test.sh[1168]: s
  Apr 30 18:56:40 f test.sh[1168]: nd be truncate
  Apr 30 18:56:40 f test.sh[1165]: n
  Apr 30 18:56:40 f systemd[1]: test.service: Succeeded.
  Apr 30 18:56:40 f systemd[1]: Stopped Test Truncate.

  
  [Regression Potential] 

   * The patches are rather small, but there might be a slightly increased 
     memory consumption of journald for output buffers. 
   * Issues (if any and I couldn't find any so far) should be only to 
     journald output handling. Systemd is huge, this at least narrows
     down the potential places of a regression a lot.

  [Other Info]
   
   * n/a

  --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---

  Originally reported against libvirt which happens to be one of the
  example-triggers

  Hi,

  when I shut down my machine I see messages from /usr/lib/libvirt
  /libvirt-guests.sh but there are 2 anomalies:

   - 3 libvirt-guests.sh processes are run
   - messages are truncated

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: libvirt-daemon 6.0.0-0ubuntu8
  Uname: Linux 5.6.7-050607-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: KDE
  Date: Tue Apr 28 19:42:56 2020
  SourcePackage: libvirt
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.libvirt.nwfilter.allow-arp.xml: [inaccessible: [Errno 
13] Permission denied: '/etc/libvirt/nwfilter/allow-arp.xml']
  modified.conffile..etc.libvirt.nwfilter.allow-dhcp-server.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/allow-dhcp-server.xml']
  modified.conffile..etc.libvirt.nwfilter.allow-dhcp.xml: [inaccessible: [Errno 
13] Permission denied: '/etc/libvirt/nwfilter/allow-dhcp.xml']
  modified.conffile..etc.libvirt.nwfilter.allow-incoming-ipv4.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/allow-incoming-ipv4.xml']
  modified.conffile..etc.libvirt.nwfilter.allow-ipv4.xml: [inaccessible: [Errno 
13] Permission denied: '/etc/libvirt/nwfilter/allow-ipv4.xml']
  modified.conffile..etc.libvirt.nwfilter.clean-traffic-gateway.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/clean-traffic-gateway.xml']
  modified.conffile..etc.libvirt.nwfilter.clean-traffic.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/clean-traffic.xml']
  modified.conffile..etc.libvirt.nwfilter.no-arp-ip-spoofing.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/no-arp-ip-spoofing.xml']
  modified.conffile..etc.libvirt.nwfilter.no-arp-mac-spoofing.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/no-arp-mac-spoofing.xml']
  modified.conffile..etc.libvirt.nwfilter.no-arp-spoofing.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-arp-spoofing.xml']
  modified.conffile..etc.libvirt.nwfilter.no-ip-multicast.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-ip-multicast.xml']
  modified.conffile..etc.libvirt.nwfilter.no-ip-spoofing.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-ip-spoofing.xml']
  modified.conffile..etc.libvirt.nwfilter.no-mac-broadcast.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-mac-broadcast.xml']
  modified.conffile..etc.libvirt.nwfilter.no-mac-spoofing.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/nwfilter/no-mac-spoofing.xml']
  modified.conffile..etc.libvirt.nwfilter.no-other-l2-traffic.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/no-other-l2-traffic.xml']
  modified.conffile..etc.libvirt.nwfilter.no-other-rarp-traffic.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/no-other-rarp-traffic.xml']
  modified.conffile..etc.libvirt.nwfilter.qemu-announce-self-rarp.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/qemu-announce-self-rarp.xml']
  modified.conffile..etc.libvirt.nwfilter.qemu-announce-self.xml: 
[inaccessible: [Errno 13] Permission denied: 
'/etc/libvirt/nwfilter/qemu-announce-self.xml']
  modified.conffile..etc.libvirt.qemu.conf: [inaccessible: [Errno 13] 
Permission denied: '/etc/libvirt/qemu.conf']
  modified.conffile..etc.libvirt.qemu.networks.default.xml: [inaccessible: 
[Errno 13] Permission denied: '/etc/libvirt/qemu/networks/default.xml']

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