From owner-freebsd-hackers@FreeBSD.ORG Tue Apr 10 09:57:45 2012 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id DB749106566B for ; Tue, 10 Apr 2012 09:57:45 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from mail.zoral.com.ua (mx0.zoral.com.ua [91.193.166.200]) by mx1.freebsd.org (Postfix) with ESMTP id 477C58FC12 for ; Tue, 10 Apr 2012 09:57:44 +0000 (UTC) Received: from skuns.kiev.zoral.com.ua (localhost [127.0.0.1]) by mail.zoral.com.ua (8.14.2/8.14.2) with ESMTP id q3A9vR6K009911; Tue, 10 Apr 2012 12:57:27 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: from deviant.kiev.zoral.com.ua (kostik@localhost [127.0.0.1]) by deviant.kiev.zoral.com.ua (8.14.5/8.14.5) with ESMTP id q3A9vRBx056738; Tue, 10 Apr 2012 12:57:27 +0300 (EEST) (envelope-from kostikbel@gmail.com) Received: (from kostik@localhost) by deviant.kiev.zoral.com.ua (8.14.5/8.14.5/Submit) id q3A9vRMv056737; Tue, 10 Apr 2012 12:57:27 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: deviant.kiev.zoral.com.ua: kostik set sender to kostikbel@gmail.com using -f Date: Tue, 10 Apr 2012 12:57:26 +0300 From: Konstantin Belousov To: Sushanth Rai Message-ID: <20120410095726.GU2358@deviant.kiev.zoral.com.ua> References: <1334025431.77315.YahooMailClassic@web180011.mail.gq1.yahoo.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="Mj2Hoq6zy/C4bu/j" Content-Disposition: inline In-Reply-To: <1334025431.77315.YahooMailClassic@web180011.mail.gq1.yahoo.com> User-Agent: Mutt/1.4.2.3i X-Virus-Scanned: clamav-milter 0.95.2 at skuns.kiev.zoral.com.ua X-Virus-Status: Clean X-Spam-Status: No, score=-4.0 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 autolearn=ham version=3.2.5 X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on skuns.kiev.zoral.com.ua Cc: freebsd-hackers@freebsd.org Subject: Re: mlockall() on freebsd 7.2 + amd64 returns EAGAIN X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 10 Apr 2012 09:57:45 -0000 --Mj2Hoq6zy/C4bu/j Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Apr 09, 2012 at 07:37:11PM -0700, Sushanth Rai wrote: > Hello, >=20 > I have a simple program that links with the math library. The only thing = that program does is to call mlockall(MCL_CURRENT | MCL_FUTURE). This call = to mlockall fails with EAGAIN. I figured out that kernel vm_fault() is retu= rning KERN_PROTECTION_FAILURE when it tries to fault-in the mmap'ed math li= brary address. But I can't figure why. >=20 > The /proc//map returns the following for the process: >=20 > 0x800634000 0x80064c000 24 0 0xffffff0025571510 r-x 104 52 0x1000 COW NC = vnode /lib/libm.so.5 > 0x80064c000 0x80064d000 1 0 0xffffff016f11c5e8 r-x 1 0 0x3100 COW NNC vno= de /lib/libm.so.5 > 0x80064d000 0x80074c000 4 0 0xffffff0025571510 r-x 104 52 0x1000 COW NC v= node /lib/libm.so.5 >=20 > Since ntpd calls mlockall with same option and links with math library to= o, I look at map o/p of ntpd, which looks slightly different "resident" col= umn (3rd column) on 3rd line: > 0x800682000 0x80069a000 8 0 0xffffff0025571510 r-x 100 50 0x1000 COW NC v= node /lib/libm.so.5 > 0x80069a000 0x80069b000 1 0 0xffffff0103b85870 r-x 1 0 0x3100 COW NNC vno= de /lib/libm.so.5 > 0x80069b000 0x80079a000 0 0 0xffffff0025571510 r-x 100 50 0x1000 COW NC v= node /lib/libm.so.5 >=20 > I don't know if that has anything to do with failure. The snippet of code= that returns failure in vm_fault() is the following: >=20 > if (fs.pindex >=3D fs.object->size) { > unlock_and_deallocate(&fs); > return (KERN_PROTECTION_FAILURE); > } >=20 > Any help would be appreciated. This might be a bug fixed in r191810, but I am not sure. --Mj2Hoq6zy/C4bu/j Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (FreeBSD) iEYEARECAAYFAk+EBAYACgkQC3+MBN1Mb4j/rwCfUuRzzcpojQKcbf3Awqug6XM4 zWIAoIg3OXTe5bLFWJ4y7UX7BDchPl5f =kr3c -----END PGP SIGNATURE----- --Mj2Hoq6zy/C4bu/j--