Date: Sun, 1 Oct 2006 22:37:13 +0200 (CEST) From: Martin Blapp <mb@imp.ch> To: Alan Cox <alc@cs.rice.edu> Cc: alc@freebsd.org, current@freebsd.org Subject: Re: CURRENT unusable again, too many panics Message-ID: <20061001223622.R91466@godot.imp.ch> In-Reply-To: <45201C2B.7080706@cs.rice.edu> References: <20060928195536.Y91466@godot.imp.ch> <20061001132422.O91466@godot.imp.ch> <45201C2B.7080706@cs.rice.edu>
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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
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