755021d434
When e.g. tmp.mount is present in the initrd, and we serialize it, switch root, and deserialize, the new systemd is confused because it thinks /tmp is mounted. In general, it doesn't make sense to serialize anything that refers to paths in the old root file system. This fixes two errors for me: 1. tmp.mount was not mounted properly before local-fs.target. It would be mounted as some point (I guess when we re-read /proc/self/mountinfo for some other reason). In effect systemd-tmpfiles-setup.service would see one fs, and some other units started later a different one. In particular gdm.service would fail because the pre-created /tmp/.X11-unix with proper permissions would not exist at time it was started. 2. # systemd[1]: proc-sys-fs-binfmt_misc.automount: Got hangup/error on autofs pipe from kernel. Likely our automount point has been unmounted by someone or something else? # systemd[1]: proc-sys-fs-binfmt_misc.automount: Failed with result 'unmounted'. # systemd[1]: Mounting proc-sys-fs-binfmt_misc.mount... # systemd[1]: Mounted proc-sys-fs-binfmt_misc.mount. # systemd[1]: Starting systemd-binfmt.service... # systemd[1]: Finished systemd-binfmt.service. # systemd[1]: proc-sys-fs-binfmt_misc.automount: Path /proc/sys/fs/binfmt_misc is already a mount point, refusing start. # systemd[1]: Failed to set up automount proc-sys-fs-binfmt_misc.automount. # systemd[1]: proc-sys-fs-binfmt_misc.automount: Path /proc/sys/fs/binfmt_misc is already a mount point, refusing start. # systemd[1]: Failed to set up automount proc-sys-fs-binfmt_misc.automount. # systemd[1]: proc-sys-fs-binfmt_misc.automount: Path /proc/sys/fs/binfmt_misc is already a mount point, refusing start. # systemd[1]: Failed to set up automount proc-sys-fs-binfmt_misc.automount. # systemd[1]: Stopping systemd-binfmt.service... # systemd[1]: systemd-binfmt.service: Deactivated successfully. # systemd[1]: Stopped systemd-binfmt.service. I couldn't understand the error here, but in retrospect the first line is entirely correct: "someone or something else" was the old systemd unmounting the old root.
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