Strange panic on ppc64

[Nathan Whitehorn]

On 06/04/13 22:35, Justin Hibbits wrote:
> After a string of seemingly random hangs, I added invariants (but not
> witness) to my custom kernel config, and I get the following panic,
> recreated from a fuzzy cell phone picture:
>
>
> [thread pid -1 tid 1006665719 ]
> Stopped at 0: illegal instruction 0
> db> panic: mutex ohci1 owned at
> /usr/home/chmeee/freebsd/head/sys/dev/usb/usb_transfer.c:2280
> cpuid = 0
> Uptime: 9h8m1s
> <my dump code>
> ...
> panic: msleep1
> cpu = 0
> KDB: enter: panic
> [ thread pid -1 tid 100665719 ]
> ....
>
> The first question I have is how the hell it got such a strange PID/TID,
> memory corruption my guess, something is stomping on the pcpu or something,
> and I think these hangs have only happened since I added a lot more memory
> (up to 12G from 4G, Andreas Tobler was seeing hangs as well), so it might
> be something in the moea64 pmap code, but that's pure speculation on my
> part.  Then the other panic messages, owned mutex and panic in msleep1.  I
> enabled more trace code, so hopefully the next time it panics I can collect
> better data.
>
> - Justin
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Could you post the output from show reg? It looks like it tried to jump 
to a null pointer there.
-Nathan