Comment 4 for bug 1467943

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.