[Bug 256806] panic: vm_page_free_prep: freeing mapped page

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256806

--- Comment #9 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Niels Bakker from comment #8)
The mapping address is the same as the beginning of the vm_map_entry range.  I
believe it isn't possible for a page to be mapped into the pmap after the
pmap_remove() call, since we're in execve and other threads are suspended.

One other possibility is that the PTE was damaged somehow (e.g., due to a
hardware bit-flip), so PG_V is clear and pmap_remove() skipped it. 
Unfortunately, I think we can't check this because page table pages are not
included in minidumps.

Has the panic occurred more than once?

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