Re: panic: vm_page_free_toq: freeing mapped page

Steve Kargl wrote:
> On Wed, Mar 18, 2009 at 01:38:55PM -0500, Alan Cox wrote:
>   
>> Can you please file a problem report on this crash?  I'd like to have it in
>> the database.  It's a very rare crash that been reported on a couple
>> occasions over the past five or more years.
>>
>> Thanks,
>> Alan
>>
>> 2009/3/17 Steve Kargl <sgk_at_troutmask.apl.washington.edu>
>>
>>     
>>> Script started on Tue Mar 17 14:31:57 2009
>>> troutmask:root[201] kgdb /usr/obj/usr/src/sys/SPEW/kernel.debug
>>> /usr/tmp/vmcore.3
>>>
>>> Unread portion of the kernel message buffer:
>>> panic: vm_page_free_toq: freeing mapped page 0xffffff01f77d8f70
>>>       
>
> My system just panicked again with the same back trace and message.
> I was starting linux's acroread on my amd64 system.  If you want
> the kernel.debug and vmcore.4, then send me an email off-list.
>
>   

After looking more carefully at your stack trace, I realize that it is 
different from the one that I've seen before involving the 
vm_page_free_toq assertion.   Your stack trace says that you crashed 
while starting a 32-bit process from a 64-bit parent.  This takes a 
slightly different path through the code than starting a 64-bit process 
from 64-bit parent.

Please send me a pointer to your kernel.debug and vmcore.4

Thanks,
Alan