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Add workaround for 90 second LX systemd stop/reboot delay #1022

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Add workaround for 90 second LX systemd stop/reboot delay #1022

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Commits on Apr 7, 2022

  1. Add workaround for 90 second LX systemd stop/reboot delay 

    On SmartOS LX, systemd uses its "legacy cgroup hierarchy" (cgroup-v1)
codepath, which does not signal when the root cgroup becomes empty,
causing it to wait 90 seconds before continuing to shut down.

This commit modifies vmadm to send the `systemd-shutdown` process
SIGCHLD every second during a `vmadm stop` or `vmadm reboot` command,
which causes `systemd-shutdown` to re-check its list of remaining
processes, which removes the unnecessary wait.
    @smokris
    smokris committed Apr 7, 2022
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  2. Ensure vmobj.pid is systemd-shutdown before sending SIGCHLD

    @smokris
    smokris committed Apr 7, 2022
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