[Bug 258932] panic: vm_page_free_prep: freeing mapped page

From: <bugzilla-noreply_at_freebsd.org>
Date: Tue, 05 Oct 2021 17:15:31 UTC

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

    map entry 0xfffff80ae7805360: start=0x811be5000, end=0x8120ce000,
     prot=3/7/copy, object=0xfffff805d279b630, offset=0x0, obj ruid 0 charge
4e9000, copy (done)
      Object 0xfffff805d279b630: type=0, size=0x4e9, res=2, ref=1, flags=0x3110
ruid 0 charge 4e9000
       sref=0, backing_object(2)=(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 before
we reach the root (an anonymous swap object).

You are receiving this mail because:
You are the assignee for the bug.