Kernel panic in moea_pvo_to_pte

[Justin Hibbits]

On Tue, Dec 7, 2010 at 9:56 AM, Nathan Whitehorn <nwhitehorn at freebsd.org>wrote:

>
> On Dec 7, 2010, at 7:23 AM, Justin Hibbits wrote:
>
>  Since I started rebuilding ports yesterday, I've been hit by this panic
>> (copied from a low-res camera):
>>
>> panic: moea_pvo_to_pte: pvo 0x17e6810 pte does not match pte 0x26e0740 in
>> moea_pteg_table
>>
>> 0xe52f68a0: at panic+0x13c
>> 0xe52f68f0: at moea_pvo_to_pte+0x154
>> 0xe52f6910: at moea_pvo_remove+0x20
>> 0xe52f6930: at moea_remove+0x94
>> 0xe52f6960: at pmap_remove+0x80
>> 0xe52f6980: at vm_map_delete+0x1d0
>> 0xe52f69e0: at vm_map_remove+0x74
>> 0xe52f6a00: at vmspace_exit+0x108
>> 0xe52f6a30: at exit1+0x48c
>> 0xe52f6a70: at sys_exit+0x1c
>> 0xe52f6a80: at syscallenter+0x258
>> ...
>>
>> The svn version is r215752, I'm currently building r216254 hoping that
>> might
>> fix something.  This panic seems to occur after about 1-2 hours of ports
>> building, so is reproducible to me.  I also have the crash dumps available
>> (2).
>>
>
> This is a serious bug. Could you rebuild the kernel with the attached
> patch? That should provide some information on why the kernel has triggered
> this panic. Also, could you provide some more details on your system? I'm
> guessing it is some variety of G4, but knowing the specific CPU model and
> whether it is SMP would be very helpful.
> -Nathan
>

I'll apply this patch when I get home, seems the machine has crashed yet
again while building X :/

Machine details:

It is a G4.  MPC7455 single CPU, 2GB RAM  (MDD single 1.25GHz).

- Justin