The journal entries just before shutting down looks the same between a successful and failed shutdown.
Code:
Sep 23 12:21:29 debian-laptop systemd[1]: systemd-poweroff.service: Succeeded.
Sep 23 12:21:29 debian-laptop systemd[1]: Started Power-Off.
Sep 23 12:21:29 debian-laptop systemd[1]: Reached target Power-Off.
Sep 23 12:21:29 debian-laptop systemd[1]: Shutting down.
Sep 23 12:21:29 debian-laptop kernel: systemd-shutdow: 109 output lines suppressed due to ratelimiting
Sep 23 12:21:29 debian-laptop systemd-shutdown[1]: Syncing filesystems and block devices.
Sep 23 12:21:29 debian-laptop systemd-shutdown[1]: Sending SIGTERM to remaining processes...
Sep 23 12:21:29 debian-laptop systemd-journald[307]: Journal stopped
I expect the next step is to identify what changed in the kernel that is causing this problem for me.
Is this enough information to load a Debian bug, or do I need to narrow down further?