[Merge] ~slyon/ubuntu/+source/systemd:slyon/revert-resolved-segfault into ~ubuntu-core-dev/ubuntu/+source/systemd:ubuntu-focal

[Lukas Märdian]

Actually, looking at the numbers of the new and old crash reports, I think we should let this update in as it seems to improve the situation, even if it is not providing a final fix for the root cause.

https://errors.ubuntu.com/problem/c4e5be3f1c7af9483993c7e6007b9325ab5b78cd (new)
https://errors.ubuntu.com/problem/bb0ce4ff8e6ef86041cfb5647b792823a20b44f7 (old)

As can be seen, the old crash does not happen anymore as of systemd 247.3-3ubuntu3.5/6 (Hirsute) and systemd 245.4-4ubuntu3.12/13 (Focal), but is instead replaced by the new (slightly different, but same root-cause crash). Not a single crash report of this type since the systemd SRU hit hirsute-updates (and started phasing for focal-updates) a week ago on 2021-09-15.

Additionally, we observed only 4 crashes (up to now) on Hirsute (where it's fully phased), whereas there have been 974 crash reports of the old crash in total. This is evidence that the new crash does happen less often, thus improves the situation overall, even though not fixing the root cause. It also supports the statement made by the original bug reporter in https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1934221/comments/34 that the crash still happens, but less frequent.

With the old crash not happening anymore and the new crash happening less frequent, I think we should ask the release team to manually approve/phase this SRU, as it improves the overall situation.
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https://code.launchpad.net/~slyon/ubuntu/+source/systemd/+git/systemd/+merge/408816
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