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Date: Sun, 1 Oct 2006 22:37:13 +0200 (CEST)
From: Martin Blapp <mb@imp.ch>
To: Alan Cox <alc@cs.rice.edu>
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Cc: alc@freebsd.org, current@freebsd.org
Subject: Re: CURRENT unusable again, too many panics
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> Can you tell me what if anything is printed with the attached patch applied?
>

Hi,

>  MFC
>    Correct a very old and very obscure bug: vmspace_fork() calls
>    pmap_copy() if the mapping is VM_INHERIT_SHARE.  Suppose the mapping
>    is also wired.  vmspace_fork() clears the wiring attributes in the vm
>    map entry but pmap_copy() copies the PG_W attribute in the PTE.  I
>    don't think this is catastrophic.  It blocks pmap_remove_pages() from
>    destroying the mapping and corrupts the pmap's wiring count.

With or without this MFC applied ?

Martin