[Bug 233998] [hang] [shutdown] system hangs indefinitely on shutdown

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233998

            Bug ID: 233998
           Summary: [hang] [shutdown] system hangs indefinitely on
                    shutdown
           Product: Base System
           Version: 12.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: interloper255 at gmail.com

Created attachment 200096
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=200096&action=edit
Image of console output at shutdown

Since upgrading some hardware in a machine, my system hangs indefinitely when
issuing `shutdown -p` such that it behaves like `shutdown -h`. Resetting the
machine via `shutdown -r` works fine, and I've ruled out an electrical/hw issue
by probing the hardware, and shutting down the system successfully whilst
booted into other operating systems. This has been an issue in 11.{1.2}-RELEASE
with this hardware, but is still a problem with 12.0-RELEASE.

H/W:
FreeBSD: 12.0-RELEASE
CPU: AMD Threadripper 1950X
Mobo: Asus Zenith Extreme (X399)

I'm unable to capture logs, but I've attached a capture of the console at
shutdown. At the point in the image, the system hangs indefinitely.

If there is any further pertinent information I can provide, please let me
know.

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