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Date:      Tue, 05 Oct 2021 17:15:31 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 258932] panic: vm_page_free_prep: freeing mapped page
Message-ID:  <bug-258932-227-mfsfFtD7Ky@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-258932-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-258932-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D258932

--- Comment #9 from Mark Johnston <markj@FreeBSD.org> ---
procvm entry:

    map entry 0xfffff80ae7805360: start=3D0x811be5000, end=3D0x8120ce000,
eflags=3D0x4,=20=20=20=20=20=20=20=20
     prot=3D3/7/copy, object=3D0xfffff805d279b630, offset=3D0x0, obj ruid 0=
 charge
4e9000, copy (done)
      Object 0xfffff805d279b630: type=3D0, size=3D0x4e9, res=3D2, ref=3D1, =
flags=3D0x3110
ruid 0 charge 4e9000
       sref=3D0, backing_object(2)=3D(0xfffff802509ca210)+0x0

So this map entry shadows the object to which the page belongs.  Both this
object and its backing object (the one containing page 0xfffffe006b2d04d8) =
have
ONEMAPPING set.  The shadow chain seems very deep, about 12 VM objects befo=
re
we reach the root (an anonymous swap object).

--=20
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