Ivan Kruglov
d3c93d1678
systemd creates one .swap unit per udev device link of every device listed in /proc/swaps. When such a device link disappears while the swap itself stays on -- e.g. because the link is not unique and udev repoints it at another partition -- /proc/swaps doesn't change, so nothing re-examines the unit and it stays active. The next daemon-reload then orphans it: all units are dropped and rebuilt, the enumeration from /proc/swaps no longer produces this name, and only the deserialization brings the unit back, i.e. by name and without a fragment on disk. swap_coldplug() restored its active state regardless, leaving a unit that is active, unloadable and has no device, and that is never garbage collected because active units aren't. Refuse to adopt such a unit: if neither /proc/swaps nor a fragment vouches for it, it describes a swap that doesn't exist anymore. Units that still have a control process around are left alone, so that the process is re-adopted and the timeout re-armed; those end up dead once it exits, as they aren't backed by /proc/swaps either. Issue: https://github.com/systemd/systemd/issues/43442
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