Hi,
If the root file system is initially mounted read-only, there is a
possible race between rc-once.service and the
systemd-remount-fs.service. If rc-once.service sees the root filesystem
is mounted read-only, then it will temporarily remount it read-write and
later mount it read-only again. Meanwhile, systemd-remount-fs.service
will also remount the root file system as specified by /etc/fstab which
could be read-write. Depending on the ordering, it is possible for the
root file-system to end up mounted read-only when it should have ended
up mounted read-write.
As long as the two services do not run simultaneously, the root file
system should end up mounted in the correct state. However, I do not
know what the intended order is supposed to be. Perhaps it is
intentionally system-dependent?
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