[Bug 256806] panic: vm_page_free_prep: freeing mapped page

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 24 Jun 2021 16:04:02 UTC 
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256806

--- Comment #7 from Mark Johnston <markj@FreeBSD.org> ---
Ok, so either the mappings belong to a different address space (i.e.,
OBJ_ONEMAPPING should not be set), or a new mapping was somehow created after
the pmap_remove() call.  We can look at the pv entry to see if the mapping
matches our map entry's bounds:

(kgdb) p *((vm_page_t)0xfffffe0014633408)->md.pv_list.tqh_first

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