[Bug 259441] System not booting with "KDB: debugger backends: ddb"

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 25 Oct 2021 18:06:14 UTC

            Bug ID: 259441
           Summary: System not booting with "KDB: debugger backends: ddb"
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: dei_sesshoumaru@yahoo.de

Created attachment 229028
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=229028&action=edit
Boot Hang

I have a TrueNAS 12 system (using FreeBSD 12 under the hood) which suddenly
stopped booten with the message "KDB: debugger backends: ddb" (see
attachements). The system is a Supermicro Server CSE-848X 4x 12C Xeon E7-4850
v2 2,3GHz 256GB ECC.

There was no update or anything done. After a regular shutdown it comes not up
anymore. SLIT tables shoes my 4 NUMA nodes but then stops, going into a reboot
cycle which then finally comes to hold / hang.

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