Date: Sun, 01 Oct 2006 15:48:26 -0500 From: Alan Cox <alc@cs.rice.edu> To: Martin Blapp <mb@imp.ch> Cc: alc@freebsd.org, current@freebsd.org Subject: Re: CURRENT unusable again, too many panics Message-ID: <4520299A.80102@cs.rice.edu> In-Reply-To: <20061001223622.R91466@godot.imp.ch> References: <20060928195536.Y91466@godot.imp.ch> <20061001132422.O91466@godot.imp.ch> <45201C2B.7080706@cs.rice.edu> <20061001223622.R91466@godot.imp.ch>
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Martin Blapp wrote: >> 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 ? > It won't matter. However, the patch will likely not apply cleanly with the above change backed out simply due to the context being different. Alan
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