panic: bad pte
Doug White
dwhite at gumbysoft.com
Thu Apr 15 19:42:01 PDT 2004
On Sun, 11 Apr 2004, Andrea Campi wrote:
> Hi,
>
> I know this has been mentioned before on the list, and probably I should
> know what to make of it, but still...
>
> I'm getting this panic from time to time (not easy to reproduce, no
> apparent pattern):
>
> TPTE at 0xbfca06ec IS ZERO @ VA 281bb000
> panic: bad pte
> at line 2558 in file /usr/src/sys/i386/i386/pmap.c
>
>
> I was silly and just typed c so nothing more to work on I'm afraid.
> Basically, what I'm asking is: what's it about? Is it hardware-related,
> is it a know problem, or should I wait for it to happen again and look
> into getting more details?
A pte is a Page Table Entry and has to do with memory mapping. This
particular panic is triggered when it discovers a page its trying to
remove from a process doesn't appear to exist. This can be caused by bad
memory corrupting the page tables, or it could be a bug.
Someone wwhos familiar with the pagetable layout may want to investigate
the given VA to see whats corrupted. That prson isn't me unfortunately :)
Try to capture a crashdump and save it and the debugging kernel somewhere
in case someone wants to look at it offline.
--
Doug White | FreeBSD: The Power to Serve
dwhite at gumbysoft.com | www.FreeBSD.org
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