[Bug 270472] MS devkit hangs during boot if PAC is enabled

From: <bugzilla-noreply_at_freebsd.org>
Date: Sun, 26 Mar 2023 20:48:41 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=270472

            Bug ID: 270472
           Summary: MS devkit hangs during boot if PAC is enabled
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: markj@FreeBSD.org
                CC: Andrew@FreeBSD.org

Currently one needs to set hw.pac.enable=0 to boot FreeBSD on the devkit.  Some
debugging indicates that the hang occurs when ptrauth_thread0() attempts to
load the APIA key, but I don't have a good way to see what's actually
happening.  Maybe EL1 is configured to trap upon access to the key registers.

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