kern/47830: Panic: pmap_pte_spill: victim p-pte (0x1ffcb68)

[donlee%mercy.icompute.com@localhost]

>Number:         47830
>Category:       kern
>Synopsis:       Panic:  pmap_pte_spill: victim p-pte (0x1ffcb68)
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri May 17 22:15:00 +0000 2013
>Originator:     Donald Lee
>Release:        NetBSD 6.0.1 (release, stock)
>Organization:
iCompute.com
>Environment:
System: NetBSD mercy 6.0.1 NetBSD 6.0.1 (GENERIC) macppc
Architecture: powerpc
Machine: macppc
>Description:
        I have been getting panics on my production machine.  They appear to 
happen
        mostly in the morning, when the apache statistics runs are active, and 
there
        is a fair amount of disk activity, and possibly network activity.

        The message in /var/log/messages is:

May 16 07:27:45 mercy syslogd[151]: restart
May 16 07:27:45 mercy /netbsd: panic: pmap_pte_spill: victim p-pte (0x1ffcb68) 
has no pvo entry!
May 16 07:27:45 mercy /netbsd: cpu0: Begin traceback...
May 16 07:27:45 mercy /netbsd: 0xe1d3fe10: at panic+0x4c
May 16 07:27:45 mercy /netbsd: 0xe1d3fe50: at pmap_pte_spill+0x4c0  
May 16 07:27:45 mercy /netbsd: 0xe1d3fe90: at trap+0xa60
May 16 07:27:45 mercy /netbsd: 0xe1d3ff20: user ISI trap by 0x183d4e4: 
srr1=0x4200d032
May 16 07:27:45 mercy /netbsd:            r1=0xffffb2b0 cr=0x24000044 xer=0 
ctr=0xfdd70cb8
May 16 07:27:45 mercy /netbsd: cpu0: End traceback... 
May 16 07:27:45 mercy /netbsd: dumpsys: TBD
May 16 07:27:45 mercy /netbsd: wd2: flush cache command didn't complete
May 16 07:27:45 mercy /netbsd: wd1: flush cache command didn't complete
May 16 07:27:45 mercy /netbsd: rebooting 

>How-To-Repeat:
I don't know.

>Fix: