Date: Mon, 12 Mar 2012 18:25:59 -0700 From: David Wolfskill <david@catwhisker.org> To: stable@freebsd.org Subject: mmap() issues in 8.3-PRE Message-ID: <20120313012559.GE1440@albert.catwhisker.org>
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--N1GIdlSm9i+YlY4t Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable At work, a colleague has been researching some problems we encountered in 8.2-R; he found that some commits made to stable/8 since 8.2 was released has changed the behavior, but that there are still some issues. He has filed 3 PRs (yesterday) for different aspects of what he's seen: kern/165923: Writing to NFS-backed mmapped files fails if flushed automatic= ally=20 kern/165927: msync reports success after a failed pager flush=20 docs/165929: msync(2) man page indicates obsolescence, but it's useful Here are the links (to make things a bit easier: <http://www.freebsd.org/cgi/query-pr.cgi?pr=3D165923&cat=3D>; <http://www.freebsd.org/cgi/query-pr.cgi?pr=3D165927&cat=3D>; <http://www.freebsd.org/cgi/query-pr.cgi?pr=3D165929&cat=3D>; The basic result is that attempts to write to an mmap()ed file may fail silently. If it turns out that his analysis is incorrect, we would sure like to know about it. On the other hand, if the analysis is (largely) correct, folks may want to be thinkng about whether 8.3 should be released with the behavior in question, whether it should be documented via Errata, or whether we should try to fix the problem before 8.3 is released. Peace, david --=20 David H. Wolfskill david@catwhisker.org Depriving a girl or boy of an opportunity for education is evil. See http://www.catwhisker.org/~david/publickey.gpg for my public key. --N1GIdlSm9i+YlY4t Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.18 (FreeBSD) iEYEARECAAYFAk9eoiYACgkQmprOCmdXAD0NZACfbOzO5MtBK9IygY62pW5gNQ9g SS0AnA6s//pTUnCpUOrqXAdgTOYsmDsq =rpX5 -----END PGP SIGNATURE----- --N1GIdlSm9i+YlY4t--
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