When I halt/reboot my system I get "INIT: failed write of utmpx entry"

When the system shuts down, init(1m) updates /var/adm/utmp* to
reflect that fact.

If you have a separate /var filesystem, this operation will happen
after /var is unmounted and init complains:

INIT: failed write of utmpx entry:"s6"
INIT: failed write of utmpx entry:"rb"

You can safely ignore these messages.

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