netdev - Re: Reporting bugs and bisection

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Message-ID: <Pine.LNX.4.64.0804142221480.7090@wrl-59.cs.helsinki.fi>
Date:	Mon, 14 Apr 2008 22:30:55 +0300 (EEST)
From:	"Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>
cc:	Al Viro <viro@...IV.linux.org.uk>, Willy Tarreau <w@....eu>,
	david@...g.hm, Stephen Clark <sclark46@...thlink.net>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"Rafael J. Wysocki" <rjw@...k.pl>, Tilman Schmidt <tilman@...p.cc>,
	Valdis.Kletnieks@...edu, Mark Lord <lkml@....ca>,
	David Miller <davem@...emloft.net>, jesper.juhl@...il.com,
	yoshfuji@...ux-ipv6.org, Jeff Garzik <jeff@...zik.org>,
	linux-kernel <linux-kernel@...r.kernel.org>, git@...r.kernel.org,
	Netdev <netdev@...r.kernel.org>
Subject: Re: Reporting bugs and bisection

On Mon, 14 Apr 2008, Andrew Morton wrote:

> On Mon, 14 Apr 2008 07:43:49 -0700 Arjan van de Ven <arjan@...radead.org> wrote:
> 
> > I'll be writing a report with more details about this soon with more analysis and statistics
> > (I'll be looking at more detail around the top 25 issues, when they got introduced, when they got fixed etc)
> 
> Well OK.  But I don't think we can generalise from oops-causing bugs all
> the way to all bugs.  Very few bugs actually cause oopses, and oopses tend
> to be the thing which developers will zoom in on and pay attention to.
> 
> If we had metrics on "time goes backwards" or anything containing "ASUS",
> things might be different.

Even oopses have pitfalls, like in 25-rcs where those WARN_ON TCP 
backtraces were due to three different bugs (there might be fourth one 
still remaining). ...kerneloops.org didn't even make difference between 
different WARN_ONs in a function though that would have helped only little 
in the case of 25-rc TCP because of different bugs causing failures in the 
same invariant.

-- 
 i.

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