On Tue, 5 Aug 2014 20:49-0700, John Baldwin wrote:

> 
> On Aug 5, 2014, at 2:29 PM, Michael Butler <i...@protected-networks.net> 
> wrote:
> 
> > On 08/05/14 16:56, Michael Butler wrote:
> >> On 08/05/14 16:02, John Baldwin wrote:
> >> 
> >>> My guess is that the recent Xen changes tickled something.
> >> 
> >> I can confirm this on a kernel which is otherwise up to date ..
> >> 
> >> FreeBSD toshi.auburn.protected-networks.net 11.0-CURRENT FreeBSD
> >> 11.0-CURRENT #2 r269608M: Tue Aug  5 16:48:12 EDT 2014
> >> 
> >> I backed out all of SVN r269507 through r269515.
> >> 
> >> Now working ..
> > 
> > [ .. snip .. ]
> > 
> >> Now to see if it's related to the other machine's disk woes (it's a
> >> single-core device),
> > 
> > And it fixes the inability to probe disks on my single-core machine :-)
> 
> It looks like the MADT code to probe the I/O APICs isn't working so 
> it's trying to fall back to using the ATPIC while using SMP (which 
> doesn't work).  I know it's a pain on a laptop, but if it is at all 
> possible to capture either a verbose or non-verbose dmesg that would 
> really help narrow it down.
> 
> Also, if anyone can try reverting just the MADT-related changes in 
> the recent Xen changes to see if you can narrow down which exact one 
> triggers the panic that would be really helpful.

I noticed this panic on i386 head r269607 yesterday, running in VBox 
on Windows 7 SP1 x64, on an Intel(R) Core(TM) i7 CPU 960 @ 3.20GHz 
(3175.67-MHz 686-class CPU).

Go to http://ximalas.info/~trond/atpic_assign_cpu/ where you'll find a 
verbose dmesg from i386 head r268838 from the same VM and a couple of 
screenshots of the crash while booting r269607 with the verbose flag 
on.

I'm rewinding /usr/src to r269507, and I'll take it from there, one 
commit at the time.

I'll also try to investigate this panic using my amd64 head VM.

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