Date: Wed, 25 Apr 2007 16:57:01 +0800 From: LI Xin <delphij@delphij.net> To: Oleg Derevenetz <oleg@vsi.ru> Cc: freebsd-stable@freebsd.org, Kris Kennaway <kris@obsecurity.org> Subject: Re: How to report bugs (Re: 6.2-STABLE deadlock?) Message-ID: <462F17DD.5090001@delphij.net> In-Reply-To: <1177488860.462f0ddc6ce8c@webmail.vsi.ru> 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>
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[-- Attachment #1 --] Oleg Derevenetz wrote: [snip] > Not all people can do deadlock debugging, though. In my case turning on > INVARIANTS and WITNESS leads to unacceptable performance penalty due to heavily > loaded server. So I can only describe my case, actions and result without > 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, -- Xin LI <delphij@delphij.net> http://www.delphij.net/ FreeBSD - The Power to Serve! [-- Attachment #2 --] -----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-----
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