From owner-freebsd-current@FreeBSD.ORG Thu Jan 10 22:25:49 2013 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by hub.freebsd.org (Postfix) with ESMTP id D80E8866 for ; Thu, 10 Jan 2013 22:25:49 +0000 (UTC) (envelope-from delphij@delphij.net) Received: from anubis.delphij.net (anubis.delphij.net [IPv6:2001:470:1:117::25]) by mx1.freebsd.org (Postfix) with ESMTP id BE3EBD38 for ; Thu, 10 Jan 2013 22:25:49 +0000 (UTC) Received: from epsilon.delphij.net (drawbridge.ixsystems.com [206.40.55.65]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by anubis.delphij.net (Postfix) with ESMTPSA id 6727A22D53; Thu, 10 Jan 2013 14:25:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=delphij.net; s=anubis; t=1357856749; bh=XFGbKEHyI09ssK2zQXQOvXX09OaLPAtZab+TZ4mxN9A=; h=Date:From:Reply-To:To:CC:Subject:References:In-Reply-To; b=B1hbr4humEWPLMNO6CgEc3NqORsa4zhaLNBve919a3yRKWeqUVf9yer8Llu/9eHXS rBwuVBtrKLfrUiJKIPcKMrXyPXTZOMDN1YL31jP7yBJ797DFS4dd/2qhvUGZXoFe+E XvpCYrsDMlH0qNqLE5q/oHY20C/SsfAlxkr8eyhg= Message-ID: <50EF3FEC.60605@delphij.net> Date: Thu, 10 Jan 2013 14:25:48 -0800 From: Xin Li Organization: The FreeBSD Project MIME-Version: 1.0 To: d@delphij.net Subject: Re: sysctl -a causes kernel trap 12 References: <50EB602F.9050300@delphij.net> <20130108000233.GZ82219@kib.kiev.ua> <50EB63A9.50903@delphij.net> <50EB870D.3020306@delphij.net> In-Reply-To: <50EB870D.3020306@delphij.net> X-Enigmail-Version: 1.4.6 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Brandon Gooch , Konstantin Belousov , freebsd-current@freebsd.org X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list Reply-To: d@delphij.net List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Jan 2013 22:25:49 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 To all: this became more and more hard to replicate lately. I've tried these options and the most important progress is that it's possible to get a crashdump when debug.debugger_on_panic=0 and I managed to get a backtrace which indicates the panic occur when trying to do mtx_lock(&Giant) -> __mtx_lock_sleep -> turnstile_wait -> propagate_priority, but after I've added some instruments to the surrounding code and enabled INVARIANT and/or WITNESS, it mysteriously went away. Reverting my instruments code and update to latest svn makes the issue disappear for one day. I've hit it again today but unfortunately didn't get a successful dump and after reboot I can't reproduce it again :( Still trying... Cheers, - -- Xin LI https://www.delphij.net/ FreeBSD - The Power to Serve! Live free or die -----BEGIN PGP SIGNATURE----- iQEcBAEBCAAGBQJQ7z/sAAoJEG80Jeu8UPuzJbMIAL2xM6xWATXp2swY1E25WaCj UoDAJtVkGvI5pOQmt7UBvDJfqr74/1c1ugGodFVAtRluKihxQ6amXcmF62eqPu0g ARj7R+g/5qQ+QDDOVFcqnvuz1A1KwoDD5jkfAyq+oWECQ5a4ROk/59EhlriK9CQd I4NRzuJLgOf3t4xNk7nAEYSnx+zL07vpGmSNIHdWkLieGNIoa1X5W9HtfpOGgRpm c5ELbWTpxGTtAFmFxc7h2hygu38/hlj6KPJHRK6HGcR1t/EMc2Rauzn7Bl3R3C/W TjDrxknPjZUUA70oI2V2Vo8tGZaJCzpq8dDWb8fx5rbKxLM+svmShHYftow78rM= =ooDY -----END PGP SIGNATURE-----