I can only reach the `systemd` debug shell randomly, i.e. the system
freezes either before I can press Ctrl+Alt+F9, right after it so that I
can't run `journalctl -ab > /root/journal.txt` or right after running
the command so that data isn't written to `/root/journal.txt` because
the system can apparently only be rebooted with Ctrl+Alt+SysRq+b so that
the data is never written to the filesystem (btrfs).
After 5 failures at different states I couldn't recognize any pattern
which causes the freeze. The start of debugging shell works consistently
well if the btrfs image isn't mounted.
** Changed in: systemd (Ubuntu)
Status: Expired => New
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https://bugs.launchpad.net/bugs/1467943
Title:
system shutdown hangs if btrfs on file image (mounted via cifs) is
mounted
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