From owner-freebsd-stable@FreeBSD.ORG Wed Apr 25 08:57:18 2007 Return-Path: X-Original-To: freebsd-stable@freebsd.org Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id B63C516A400 for ; Wed, 25 Apr 2007 08:57:18 +0000 (UTC) (envelope-from delphij@delphij.net) Received: from tarsier.geekcn.org (tarsier.geekcn.org [210.51.165.229]) by mx1.freebsd.org (Postfix) with ESMTP id 2205413C468 for ; Wed, 25 Apr 2007 08:57:18 +0000 (UTC) (envelope-from delphij@delphij.net) Received: from localhost (tarsier.geekcn.org [210.51.165.229]) by tarsier.geekcn.org (Postfix) with ESMTP id 275E1EB5A13; Wed, 25 Apr 2007 16:57:17 +0800 (CST) X-Virus-Scanned: amavisd-new at geekcn.org Received: from tarsier.geekcn.org ([210.51.165.229]) by localhost (mail.geekcn.org [210.51.165.229]) (amavisd-new, port 10024) with ESMTP id FP1IFaab3Nce; Wed, 25 Apr 2007 16:57:11 +0800 (CST) Received: from LI-Xins-MacBook.local (sina152-194.staff.sina.com.cn [61.135.152.194]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by tarsier.geekcn.org (Postfix) with ESMTP id 1DEE3EB5A09; Wed, 25 Apr 2007 16:57:11 +0800 (CST) DomainKey-Signature: a=rsa-sha1; s=default; d=delphij.net; c=nofws; q=dns; h=message-id:date:from:organization:user-agent:mime-version:to:cc: subject:references:in-reply-to:x-enigmail-version:content-type; b=ggbTWzzn9p3MDL1lH83p9Hr0lY5P6nh8hQoiv9MpK/SsmeuJEZ7mibzx+amgu3RRI nMeFoHSrcddqot606fR6w== Message-ID: <462F17DD.5090001@delphij.net> Date: Wed, 25 Apr 2007 16:57:01 +0800 From: LI Xin Organization: The FreeBSD Project User-Agent: Thunderbird 2.0.0.0 (Macintosh/20070326) MIME-Version: 1.0 To: Oleg Derevenetz References: <20070313140848.GA89182@steerpike.hanley.stade.co.uk> <20070423025631.GA33256@steerpike.hanley.stade.co.uk> <20070423113912.GE2052@deviant.kiev.zoral.com.ua> <462DDB4D.8080507@delphij.net> <1177442585.462e5919c71f0@webmail.vsi.ru> <462EC294.3040001@delphij.net> <20070425035316.GB44054@xor.obsecurity.org> <1177488860.462f0ddc6ce8c@webmail.vsi.ru> In-Reply-To: <1177488860.462f0ddc6ce8c@webmail.vsi.ru> X-Enigmail-Version: 0.95.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="------------enig91C5206A4D3B60FC2266D36C" Cc: freebsd-stable@freebsd.org, Kris Kennaway Subject: Re: How to report bugs (Re: 6.2-STABLE deadlock?) X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 25 Apr 2007 08:57:18 -0000 This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig91C5206A4D3B60FC2266D36C Content-Type: text/plain; charset=KOI8-R Content-Transfer-Encoding: quoted-printable Oleg Derevenetz wrote: [snip] > Not all people can do deadlock debugging, though. In my case turning on= =20 > INVARIANTS and WITNESS leads to unacceptable performance penalty due to= heavily=20 > loaded server. So I can only describe my case, actions and result witho= ut=20 > providing any debug information. I'd say that I completely agree with Kris because that it's very hard for developers to investigate problems if there is no detailed information available, especially for those problems that can not easily reproduced. Of course, deadlock debugging could be tricky, but having a backtrace can usually save a lot of time (and fortunately that is not that hard even for average users :) What I wanted to suggest is that, we hope that the submitter can provide detailed steps to reliably reproduce the problem whenever possible, if they are not able to diagnose the problem themselves, so we will be able to extract more information at lab, and possibly reach a fix. The problem I have is that the reporter of the issue is not quite cooperative as they did before, and what I wanted to say is that it's possible to trigger the livelock without nullfs/unionfs, and I did not figured out why (yet) because I can not reproduce it in my environment :-= ( Cheers, --=20 Xin LI http://www.delphij.net/ FreeBSD - The Power to Serve! --------------enig91C5206A4D3B60FC2266D36C Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFGLxfdOfuToMruuMARCpoeAJ9rD7+zIgWanFvtr5mOUPtno8X2+wCfYq9C jRhnVFxAIll9mOa7vWdSeBo= =O4w2 -----END PGP SIGNATURE----- --------------enig91C5206A4D3B60FC2266D36C--