Hi,

We're currently seeing a lot of tmpfails on ci.debian.net. It turns out
that each testbed that upgrades binaries from systemd during it's
preparation step and ordering a reboot fails to return. (I'd put this
bug at severity serious if I had better info, but filing already to
kickstart discussion).

To reproduce I ran the following command, which only updates systemd
binaries from unstable in the testing testbed:
autopkgtest -ddd --setup-commands="echo" --apt-upgrade
--no-built-binaries  --timeout=30600 
--pin-packages=unstable=src:systemd --add-apt-source='deb 
http://deb.debian.org/debian unstable main' hello -- incus
autopkgtest/debian/testing/amd64 -- --storage tmpfs

I note two lines that worry me a bit, but they may be red harrings:
1) Can't exec "kill": No such file or directory at
/usr/bin/deb-systemd-invoke line 179.
2) Could not execute systemctl:  at /usr/bin/deb-systemd-invoke line 148.

Paul

The log fails with:
Unpacking libsystemd0:amd64 (262~rc2-1) over (261.2-1) ...
Setting up libsystemd0:amd64 (262~rc2-1) ...
(Reading database ... 10013 files and directories currently installed.)
Preparing to unpack .../libudev1_262~rc2-1_amd64.deb ...
Unpacking libudev1:amd64 (262~rc2-1) over (261.2-1) ...
Setting up libudev1:amd64 (262~rc2-1) ...
Setting up systemd (262~rc2-1) ...
Can't exec "kill": No such file or directory at
/usr/bin/deb-systemd-invoke line 179.
Job for systemd-journald.service failed because the control process
exited with error code.
See "systemctl status systemd-journald.service" and "journalctl -xeu
systemd-journald.service" for details.
Job for systemd-networkd.service failed because the control process
exited with error code.
See "systemctl status systemd-networkd.service" and "journalctl -xeu
systemd-networkd.service" for details.
Setting up systemd-resolved (262~rc2-1) ...
Could not execute systemctl:  at /usr/bin/deb-systemd-invoke line 148.
Setting up systemd-sysv (262~rc2-1) ...
Processing triggers for dbus (1.16.2-5+b1) ...
Processing triggers for libc-bin (2.43-5) ...
autopkgtest: DBG: testbed command exited with code 0
autopkgtest: DBG: testbed command ['/bin/sh', '-ec', '"$@" 3>&2 2>&1',
'run_apt_command', 'apt-get', '--quiet', '--assume-yes',
'-o=APT::Status-Fd=3', '-o=APT::Install-Recommends=false',
'-o=DPkg::Lock::Timeout=300', '-o=Dpkg::Options::=--force-confnew',
'-o=Debug::pkgProblemResolver=true', '--purge', 'autoremove'], kind
install, sout raw, serr pipe, env ['DEBIAN_FRONTEND=noninteractive',
'APT_LISTBUGS_FRONTEND=none', 'APT_LISTCHANGES_FRONTEND=none']
Reading package lists...
Building dependency tree...
Reading state information...
Solving dependencies...
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
autopkgtest: DBG: testbed command exited with code 0
autopkgtest: DBG: testbed command ['bash', '-ec', '[ ! -e
/run/autopkgtest_no_reboot.stamp ] || exit 0;for d in /boot /boot/efi
/boot/grub /etc/init /etc/init.d /etc/systemd/system
/lib/systemd/system; do s=/tmp/autopkgtest.d5pcqe/${d//\\//_}.stamp;  [
! -d $d ] || [ `stat -c %Y $d` = `stat -c %Y $s` ]; done'], kind short,
sout raw, serr raw, env []
autopkgtest: DBG: testbed command exited with code 1
autopkgtest [20:11:11]: rebooting testbed after setup commands that
affected boot
autopkgtest: DBG: sending command to virtualisation server: reboot
<VirtSubproc>: failure: timed out waiting for instance
local:autopkgtest-incus-pgtacr to restart
autopkgtest: DBG: sending command to virtualisation server:
auxverb_debug_fail
autopkgtest: DBG: TestbedFailure cannot send to virtualisation server:
[Errno 32] Broken pipe
autopkgtest: DBG: auxverb_debug_fail failed: cannot send to
virtualisation server: [Errno 32] Broken pipe
autopkgtest: DBG: TestbedFailure eof from the virtualisation server
autopkgtest [20:12:54]: ERROR: testbed failure: eof from the
virtualisation server
autopkgtest: DBG: testbed stop
autopkgtest: DBG: testbed close, scratch=/tmp/autopkgtest.d5pcqe
autopkgtest: DBG: sending command to virtualisation server: close
autopkgtest: DBG: TestbedFailure cannot send to virtualisation server:
[Errno 32] Broken pipe
Exception ignored in: <_io.TextIOWrapper name=5 encoding='UTF-8'>
BrokenPipeError: [Errno 32] Broken pipe