Date: Tue, 24 Apr 2007 23:53:16 -0400 From: Kris Kennaway <kris@obsecurity.org> To: LI Xin <delphij@delphij.net> Cc: freebsd-stable@freebsd.org, Oleg Derevenetz <oleg@vsi.ru> Subject: How to report bugs (Re: 6.2-STABLE deadlock?) Message-ID: <20070425035316.GB44054@xor.obsecurity.org> In-Reply-To: <462EC294.3040001@delphij.net> 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>
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[-- Attachment #1 --] On Wed, Apr 25, 2007 at 10:53:08AM +0800, LI Xin wrote: > Hi, Oleg, > > Oleg Derevenetz wrote: > > ??????? LI Xin <delphij@delphij.net>: > [...] > >> I'm not very sure if this is specific to one disk controller. Actually > >> I got some occasional reports about similar hangs on amd64 6.2-RELEASE > >> (slightly patched version) that most of processes stuck in the 'ufs' > >> state, under very light load, the box was equipped with amr(4) RAID. > >> > >> I was not able to reproduce the problem at my lab, though, it's still > >> unknown that how to trigger the livelock :-( Still need some > >> investigate on their production system. > > > > I reported simular issue for FreeBSD 6.2 in audit-trail for kern/104406: > > > > http://www.freebsd.org/cgi/query-pr.cgi?pr=104406&cat= > > > > and there should be a thread related to this. Briefly, I suspects that this is > > related to nullfs filesystems on my server and when I cvsuped to FreeBSD 6.2- > > STABLE with Daichi's unionfs-related patches and replaced nullfs-mounted fs > > with unionfs-mounted (that was done 10.03.07) problem is gone (seems to be so, > > at least). > > Hmm... Seems to be different issues. The problem I have received was a > pgsql server (no nullfs/unionfs involved), and the hang always happen > when it is not being heavily loaded (usually in the morning, for > instance, and there is no special configuration, like scheduled tasks > which can generate disk load, etc., only the entropy harvesting), so > this is quite confusing. Yes, a large part of the confusion is the unfortunate tendency of people to do the following: <user1> my system hangs/panics/etc <user2> my system hangs/panics/etc too; it must be the same problem! What we really need is for every FreeBSD user who encounters a hang/panic/etc to avoid jumping to conclusions -- no matter how many superficial similarities there may seem to you -- and instead go through the relevant steps described here: http://www.freebsd.org/doc/en_US.ISO8859-1/books/developers-handbook/kerneldebug.html Until you (or a developer) have analyzed the resulting information, you cannot definitively determine whether or not your problem is the same as a given random other problem, and you may just confuse the issue by making claims of similarity when you are really reporting a completely separate problem. Thanks, Kris [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (FreeBSD) iD8DBQFGLtCsWry0BWjoQKURAsNdAKCwOnlz7oUKCt6jhuARsCMaAwreIgCeMFjd s7m+UjG93cLUCRmah39O2gU= =WQzm -----END PGP SIGNATURE-----home | help
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