linux-kernel - [bisect] NFS regression breaks X

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Message-ID: <46423D62.2070200@garzik.org>
Date:	Wed, 09 May 2007 17:30:10 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Chuck Lever <chuck.lever@...cle.com>,
	Trond Myklebust <Trond.Myklebust@...app.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	NeilBrown <neilb@...e.de>, Adrian Bunk <bunk@...sta.de>
Subject: [bisect] NFS regression breaks X


Original bug report, with hardware and software info:
http://lkml.org/lkml/2007/5/8/667

I love bisect :)  bisect has identified the following commit as the one 
that causes my GNOME login to die, within 10 seconds of logging in:

	commit 2bea90d43a050bbc4021d44e59beb34f384438db
	Author: Chuck Lever <chuck.lever@...cle.com>
	Date:   Thu Mar 29 16:47:53 2007 -0400

	SUNRPC: RPC buffer size estimates are too large

100% reproducible, verified regression.  My home directory is an NFSv4 
mount, and the problem appears on my client workstation, so this makes 
some sense:
> sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
> pretzel:/ on /g type nfs4 (rw,noatime,proto=tcp,addr=10.10.10.1)



As an aside, let me express the hope that the NFS developers develop 
better patch creation methods.  My bisect compile repeatedly died at

>   CHK     include/linux/version.h
>   CHK     include/linux/utsrelease.h
>   CHK     include/linux/compile.h
> fs/nfs/pagelist.c:239: error: conflicting types for ‘nfs_pageio_init’
> include/linux/nfs_page.h:80: error: previous declaration of ‘nfs_pageio_init’ was here
> make[2]: *** [fs/nfs/pagelist.o] Error 1
> make[1]: *** [fs/nfs] Error 2
> make: *** [fs] Error 2

which indicates that someone on the NFS team did not create 
wholly-contained patches when submitted to the kernel.  Build breakage 
should not be fixed in a later commit (unless the breakage already went 
upstream), because -- as we see here -- it breaks bisection.

	Jeff, occasionally guilty of same, and trying to reform


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