From owner-freebsd-stable@FreeBSD.ORG Thu Aug 29 18:45:21 2013 Return-Path: Delivered-To: stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 2D4E6324 for ; Thu, 29 Aug 2013 18:45:21 +0000 (UTC) (envelope-from kostikbel@gmail.com) Received: from kib.kiev.ua (kib.kiev.ua [IPv6:2001:470:d5e7:1::1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 8DDFB2FFE for ; Thu, 29 Aug 2013 18:45:20 +0000 (UTC) Received: from tom.home (kostik@localhost [127.0.0.1]) by kib.kiev.ua (8.14.7/8.14.7) with ESMTP id r7TIjFX4068318; Thu, 29 Aug 2013 21:45:15 +0300 (EEST) (envelope-from kostikbel@gmail.com) DKIM-Filter: OpenDKIM Filter v2.8.3 kib.kiev.ua r7TIjFX4068318 Received: (from kostik@localhost) by tom.home (8.14.7/8.14.7/Submit) id r7TIjFp6068317; Thu, 29 Aug 2013 21:45:15 +0300 (EEST) (envelope-from kostikbel@gmail.com) X-Authentication-Warning: tom.home: kostik set sender to kostikbel@gmail.com using -f Date: Thu, 29 Aug 2013 21:45:15 +0300 From: Konstantin Belousov To: Dmitry Sivachenko Subject: Re: 9-STABLE panic on intensive fork Message-ID: <20130829184515.GN4972@kib.kiev.ua> References: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="HwRt59ENP3lSF8Gg" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) X-Spam-Status: No, score=-2.0 required=5.0 tests=ALL_TRUSTED,BAYES_00, DKIM_ADSP_CUSTOM_MED,FREEMAIL_FROM,NML_ADSP_CUSTOM_MED autolearn=no version=3.3.2 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on tom.home Cc: stable@freebsd.org X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 29 Aug 2013 18:45:21 -0000 --HwRt59ENP3lSF8Gg Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Aug 28, 2013 at 06:20:29PM +0400, Dmitry Sivachenko wrote: > Hello! >=20 > I am using very recent FreeBSD-9-STABLE snapshot: > 9.2-PRERELEASE FreeBSD 9.2-PRERELEASE #0 r254986: Wed Aug 28 17:18:57 MSK= 2013 >=20 > I run uwsgi program (ports/www/uwsgi) on that machine. >=20 > When uwsgi starts, it forks pre-configured number of worker processes. > If I raise workers parameter high enough (128), I get kernel panic (100% = reproducible): >=20 > Fatal trap 12: page fault while in kernel mode >=20 > If I compile kernel with KDB enabled, I get the following stack: >=20 > pmap_demote_pde_locked() > pmap_copy() > vmspace_fork() > fork1() > sys_fork() >=20 > I have only remote console for that machine, so I made 2 screenshots: >=20 > 1) http://people.freebsd.org/~demon/screen1.jpg > Panic screen when kernel has no KDB support compiled in >=20 > 2) http://people.freebsd.org/~demon/screen2.jpg > Panic screen (2nd part) with the above stack shown. Look up the source line for the pmap_demote_pde_locked()+0x471 for your kernel. Dump the core from the panic. --HwRt59ENP3lSF8Gg Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.21 (FreeBSD) iQIcBAEBAgAGBQJSH5a6AAoJEJDCuSvBvK1BifYP/jHWVgN/JwglM4uWey15yQEw dZvffpmjsN0E2pVbxJMR9J8VH5dvDivAKBMfYosgPwb+W22jCXAqgm/MLBmX1Evx P7EzXc4i4Td8vbJsvbQp0+WsTl1skLbaOnW3+tVNujoM5YIVJhKwkjSYCJULBmTv CoYG+4CDtbtUfxxAsw3R1Ex/FnV8fcSaOCw8/nAWhR9wKYsDb/vPLGLTAVJHPfhq gz8d11Y1xBMTVDMd0fKnLRWLzdiXHn/A4NpdFvcdDH+vJ0Ggym4uEKqzB58Hplh2 7tD9NmToNl5OtUVLrM7CdkGSC2CCtP0mvTYqFM1icf2hTN1yKF+1sUXW1j8HpvU/ Uw9vL1smqY8kXkReV++lC0rOa/Oo/oYia/Az5FZpseaQhMMl9tVze7DRlnTnfbg3 XkturTOrlWLiajlOiq5ueXzaM0sIGDqtOYMJHEZnZx0/XD5hXLU1dEcptzMemUMh S9SMEM7o8x4ILjSnKFTBTkysxRkdKw2vj1Wj9ICjZhRlroKFdC2pT+RmFoUEI80E 3CO6lS1TBfAP4cZ41INxQ0UddMrvTLuYiAADUdnjdOfVRa0+qhtpR8KaWhR49I3N dWoiFKDxe9bj1DSlLcIjD1/gFJyky/LfGOik9RWaU6Z01vQSHQE5ocItpD8dK/GK d9ZqPh4Kc5IcfHHaGEK3 =A0qD -----END PGP SIGNATURE----- --HwRt59ENP3lSF8Gg--