On Sun, Mar 25, 2018 at 12:32:09PM -0700, Mark Millard wrote:
> On 2018-Mar-25, at 11:34 AM, Mark Johnston <markj at FreeBSD.org> wrote:
> 
> > 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?
> 
> It reported:
> 
> (da1:strovsc1:0:0:0) WRITE(10). CDB 2a 00 35 24 37 c7 00 00 0 00
> (da1:storvsc1:0:0:0) CAM status Command timeout
> (da1:storvsc1:0:0:0) Error 5, Retries exhausted
> Aborting dump to to I/O error.
> 
> ** DUMP FAILED (ERROR 5) **
> = 0x5

Thanks. Do you happen to know if this occurs consistently under Hyper-V?

> >> 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().
> 
> No. I listed what I could see. The console screen does not have many
> lines or rows and I was sleeping when the panic happened.

For future reference, you should be able to use "show panic" at the DDB
prompt to get the panic message.
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