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TMT does not support systemd soft-reboots - it only detects reboots by checking if /proc/stat btime changes, which doesn't happen during soft-reboots. This caused test-custom-selinux-policy to hang when running with bcvk (which allows actual soft-reboots), while it accidentally passed with testcloud (which forced full VM reboots). Add bug-soft-reboot.md documenting this limitation and update both test files to reference it. Also remove --soft-reboot=auto from test-custom-selinux-policy since we can't test it with TMT anyway. Assisted-by: Claude Code (Sonnet 4.5) Signed-off-by: Colin Walters <walters@verbum.org>
1.4 KiB
1.4 KiB
TMT soft-reboot limitation
TMT does not currently support systemd soft-reboots. It detects reboots by checking
if the /proc/stat btime (boot time) field changes, which does not happen during
a systemd soft-reboot.
See: https://github.com/teemtee/tmt/issues/3143
Note: This same issue affects Testing Farm as documented in plans/integration.fmf
where test-27-custom-selinux-policy is disabled for Packit (AWS) testing.
Impact on bootc testing
This means that when testing bootc switch --soft-reboot=auto or bootc upgrade --soft-reboot=auto:
- The bootc commands will correctly prepare for a soft-reboot (staging the deployment in
/run/nextroot) - However, TMT cannot detect or properly handle the soft-reboot
- Tests must explicitly reset the soft-reboot preparation before calling
tmt-reboot
Workaround
After calling bootc with --soft-reboot=auto, use:
ostree admin prepare-soft-reboot --reset
tmt-reboot
This forces a full reboot instead of a soft-reboot, which TMT can properly detect.
Testing environments
- testcloud: Accidentally worked because libvirt forced a full VM power cycle, overriding systemd's soft-reboot attempt
- bcvk: Exposes the real issue because it allows actual systemd soft-reboots
- Production (AWS, bare metal, etc.): Not affected - TMT is purely a testing framework; soft-reboots work correctly in production