panic: aatpic_assign_cpu: bad cookie [Was: Build machine OK; laptop panics @r269515]

On Mon, Aug 04, 2014 at 12:47:59PM -0700, David Wolfskill wrote:
> ...
> I was unable to get a crash dump, and I only recorded the offsets in the
> backtrace (no arguments; sorry -- I was expecting the build machine to
> allow me to investigate on a machine with a serial console):
> 
> ...
> SMP: AP CPU #1 Launched!
> panic: aatpic_assign_cpu: bad cookie
> cpuid=0
> atpic_assign_cpu(...) at atpic_assign_cpu+0x1a/frame 0xc2820d0c
> intr_shuffle_irqs(...) at intr_shuffle_irqs+0x97/frame 0xc2820d30
> mi_startup(...) at mi_startup+0xe7/frame 0xc2820d58
> begin(...) at begin+0x2c
> db> 
> 
> So... what can I do to help figure out what went wrong?  As noted, I
> have no serial console on the laptop, and while I have captured crash
> dumps in the past, I'm guessing that at the point the above happens, the
> machine has yet to obtain a clue about where it might put a dump if one
> were created.
> 
> (No problems with stable/9 (_at_r269499) or stable/10 (_at_r269498) on the
> same hardware.)
> ....

By booting from the previously-built kernel:

FreeBSD 11.0-CURRENT #1327  r269469M/269469:1100028: Sun Aug  3 06:16:24 PDT 2014     root_at_g1-252.catwhisker.org:/common/S4/obj/usr/src/sys/CANARY  i386

I was able to update sources to r269580 & rebuild (successfully -- both
userland & kernel); the resulting kernel, however, exhibited the same
symptoms -- "panic: aatpic_assign_cpu: bad cookie", with a similar (if
not identical -- I couldn't refer to the previous one while I was
observing the current panic) backtrace.

I'm willing to try hacking at code (if necessary) to figure out what's
wrong & fix it; I'll need some guidance, though.

Given that my build machine did not exhibit the symptoms, and given the
references to atpic, it may be relevant to point out that the machine
where I see the panic is a Dell Precision M4400 laptop.

Peace,
david
-- 
David H. Wolfskill				david_at_catwhisker.org
Taliban: Evil cowards with guns afraid of truth from a 14-year old girl.

See http://www.catwhisker.org/~david/publickey.gpg for my public key.