Date: Thu, 29 Aug 2013 21:45:15 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Dmitry Sivachenko <trtrmitya@gmail.com> Cc: stable@freebsd.org Subject: Re: 9-STABLE panic on intensive fork Message-ID: <20130829184515.GN4972@kib.kiev.ua> In-Reply-To: <CC172316-C1A0-496A-ABEA-16A9516C3467@FreeBSD.org> References: <CC172316-C1A0-496A-ABEA-16A9516C3467@FreeBSD.org>
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--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--
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