I tried removing security=selinux from the kernel command-line and then
systemd doesn't crash.
I downgraded to 257.7-1 (current testing) and that also doesn't crash.
I don't have systemd-coredump installed.
I think there's three bugs total here. One bug is that the crash
handling was bad, it just froze systemd without any log message written
anywhere, even "systemctl status" just returned an error message about
being unable to contact systemd. The second bug is the strlen crash
while trying to log an error inside sd_varlink_get_peer_uid. That might
be an outside bug if systemd is not getting a NUL terminated string from
another library. The third bug is why selinux is failing in the first
place, which might or might not be a systemd problem, but would be
probably be helped by seeing the log message.
Please let me know if there's any more info I can provide.
