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The POWER_CYCLE fallback added to reboot() flushes monitor output at the wrong time. In the untimed reboot path, flushing immediately after start_monitor() can consume the first output from the new boot before monitor() begins reading it. In the timed path, flushing after POWER_CYCLE can eat the "Linux version" banner or REBOOT_SUCCESS_LINE from the new kernel. That makes ktest miss the boot it is waiting for and can trigger an unnecessary second power cycle. Start the monitor before POWER_CYCLE so the reference counting stays balanced, but only flush when reboot() was asked to wait for a timed reboot. Perform that flush before issuing POWER_CYCLE so it drains stale output from the old kernel instead of consuming the next boot. Cc: John Hawley <warthog9@eaglescrag.net> Cc: Andrea Righi <arighi@nvidia.com> Cc: Marcos Paulo de Souza <mpdesouza@suse.com> Cc: Matthieu Baerts <matttbe@kernel.org> Cc: Fernando Fernandez Mancera <fmancera@suse.de> Cc: Pedro Falcato <pfalcato@suse.de> Link: https://patch.msgid.link/20260307-ktest-fixes-v1-6-565d412f4925@suse.com Signed-off-by: Ricardo B. Marlière <rbm@suse.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>