head -r331499 amd64/threadripper panic in vm_page_free_prep during "poudriere bulk -a", after 14h 22m or so.

[Mark Johnston]

On Sun, Mar 25, 2018 at 10:41:38AM -0700, Mark Millard wrote:
> FreeBSD panic'd while attempting to see if a "poudriere bulk -w -a"
> would get the "unnecessary swapping" problem in my UFS-only context,
> -r331499 (non-debug but with symbols), under Hyper-V. This is a
> Ryzen Threadripper context, but I've no clue if that is important
> to the problem. This was after 14 hours or so of building:
> 
> . . .
> [14:22:05] [18] [00:01:16] Finished devel/p5-Test-HTML-Tidy | p5-Test-HTML-Tidy-1.00_1: Success
> [14:22:08] [18] [00:00:00] Building devel/ocaml-camlp5 | ocaml-camlp5-6.16
> 
> So I've no clue if or how to repeat this.
> 
> Unfortunately dump was unsuccessful. 

What happened?

> So all I have is the
> backtrace. Hand typed from a screen shot of the console
> window:

Do you know what the panic message was? There are multiple calls to
panic() in vm_page_free_prep().