[Bug 258932] panic: vm_page_free_prep: freeing mapped

From: <bugzilla-noreply_at_freebsd.org>
Date: Mon, 04 Oct 2021 19:01:38 UTC

--- Comment #3 from Mark Johnston <markj@FreeBSD.org> ---
It looks like the PV entry indeed belongs to a different pmap:

db> x/xg,8 0xfffff80b88576000                                              
0xfffff80b88576000:     8e741120        fffffe23        9bd10000       
0xfffff80b88576010:     e7ac008         fffff810        c0000006        7ffc011

db> show procvm                                                          
p = 0xfffff80757808a70, vmspace = 0xfffffe2622d6c9f0, map = 0xfffffe2622d6c9f0,
pmap = 0xfffffe2622d6cb10

But it's hard to tell from ddb which process owns that pmap.  I think a kernel
dump is needed to diagnose further, though then we will lose the user PTPs.

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