Re: kern/37933: very frequent crashes after suspend/resume

["Jared D. McNeill" <jmcneill%invisible.ca@localhost>]

Steven M. Bellovin wrote:
> On Sat, 09 Feb 2008 21:16:56 -0500
> "Jared D. McNeill" <jmcneill%invisible.ca@localhost> wrote:
>
> > Are you using cpuctl to offline all APs before you suspend?
> I hadn't -- should I have?  It does seem to prevent the problem; at
> least, I wasn't able to cause any crashes when I tried that.  (To be
> sure, I got another crash when I shut down the machine to try that
> test; I haven't looked at that dump yet....)
>
> For now, I'm going to put a cpuctl in my suspend/resume scripts -- it
> had reached the point where I was shutting down rather than risking a
> second suspend.

I can't remember if I raised a PR on this or not, but there are issues 
with spinning up the APs as early as we do.

My powerd scripts simply do:

  /usr/sbin/cpuctl offline 1
  [..]
  sysctl -w machdep.sleep_state=3
  [..]
  /usr/sbin/cpuctl online 1

Cheers,
Jared