mps(4) blocks panic-reboot

[Stephen Mcconnell]

Can you try the attached patch and let me know how it goes? I didn't test
it, but since you know how, it might be easier this way. This was diff'd
from the latest mps files in stable/11, which I recently updated (today).

Thanks,
Steve

> -----Original Message-----
> From: Harry Schmalzbauer [mailto:freebsd at omnilan.de]
> Sent: Thursday, June 01, 2017 9:37 AM
> To: Stephen Mcconnell
> Cc: freebsd-scsi at freebsd.org; Scott Long
> Subject: Re: mps(4) blocks panic-reboot
>
> Bezüglich Stephen Mcconnell's Nachricht vom 01.06.2017 17:25 (localtime):
> > I found a couple of emails between me and Scott a while back and we
> > talked about this. The problem is that the SSU handling relies on
> > interrupts, but interrupts stop due to the panic, so it hangs. Scott
> > came up with a way around it but we never decided on a final fix and
> > then it was forgotten about. If you have a way to reproduce this, I can
> > try to
> find a fix here.
> > Or, I might be able to force the system to panic at the right time.
>
> Thank you very much for your attention!
>
> I remember haveing read some discussion about that topic but thought it
> was
> fixed and haven't searched any further; thanks for doing that job :-)
>
> I can reproduce at any time, willing to test anything (which I can get to
> compile
> on stable/11)!
> This is a semi-productive machine where I evaluate some netmap/bhyve
> options/stragtegies.
>
> Thanks,
>
> -harry
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