[Bug 253516] Hardware breakpoints on arm64 seems to cause the kernel to hang (deadloop?)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253516

            Bug ID: 253516
           Summary: Hardware breakpoints on arm64 seems to cause the
                    kernel to hang (deadloop?)
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: arm
          Assignee: freebsd-arm at FreeBSD.org
          Reporter: mgorny at gentoo.org
                CC: emaste at freebsd.org, mhorne at freebsd.org

While testing the new code for hardware breakpoint support for LLDB on arm64,
I've noticed that the entire system (qemu-system-aarch64) becomes almost
completely unresponsive upon hitting a hardware breakpoint.  QEMU uses 100% of
CPU on first thread, and around 50% of CPU on the 7 remaining threads (-smp 8).
 I am able to log in via the serial console but every command takes a few
minutes to execute.

I've been able to reproduce this both with Mitchell Horne's patches on top of
stable/13 branch and with vanilla 13.0 beta2 kernel.

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