I verified it for Noble as Test Plan.
before upgrading (8.18), systemd-resolved used 100% CPU and resolvectl query
timed out.
after upgrading from -proposed (8.19), CPU stays 0% and the query fails right
away.
$ dpkg -l | grep systemd
ii dbus-user-session 1.14.10-4ubuntu4.1
amd64 simple interprocess messaging system (systemd --user
integration)
ii libnss-systemd:amd64 255.4-1ubuntu8.19
amd64 nss module providing dynamic user and group name resolution
ii libpam-systemd:amd64 255.4-1ubuntu8.19
amd64 system and service manager - PAM module
ii libsystemd-shared:amd64 255.4-1ubuntu8.19
amd64 systemd shared private library
ii libsystemd0:amd64 255.4-1ubuntu8.19
amd64 systemd utility library
ii networkd-dispatcher 2.2.4-1
all Dispatcher service for systemd-networkd connection status
changes
ii python3-systemd 235-1build4
amd64 Python 3 bindings for systemd
ii systemd 255.4-1ubuntu8.19
amd64 system and service manager
ii systemd-dev 255.4-1ubuntu8.19
all systemd development files
ii systemd-hwe-hwdb 255.1.7
all udev rules for hardware enablement (HWE)
ii systemd-resolved 255.4-1ubuntu8.19
amd64 systemd DNS resolver
ii systemd-sysv 255.4-1ubuntu8.19
amd64 system and service manager - SysV compatibility symlinks
ii systemd-timesyncd 255.4-1ubuntu8.19
amd64 minimalistic service to synchronize local time with NTP
servers
** Tags removed: verification-needed-noble
** Tags added: verification-done-noble
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https://bugs.launchpad.net/bugs/2145709
Title:
systemd-resolved 100% CPU spin loop when DNS queries are rejected or
time out (fix available in v255-stable)
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