linux-kernel - Re: [bisect] NFS regression breaks X

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Message-Id: <1178748206.6760.3.camel@heimdal.trondhjem.org>
Date:	Wed, 09 May 2007 18:03:26 -0400
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Chuck Lever <chuck.lever@...cle.com>,
	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: Re: [bisect] NFS regression breaks X

On Wed, 2007-05-09 at 17:30 -0400, Jeff Garzik wrote:
> 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)

Known issue. Could you try applying the commit at

http://linux-nfs.org/cgi-bin/gitweb.cgi?p=nfs-2.6.git;a=commitdiff;h=6ce7dc940701cf3fde3c6e826a696b333092cbb1;hp=aa3d1faebe6e214cd96be0e587571477ff6fd9fc

and see if that suffices to fix the issue?

> 
> 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

The problem is that the above only appears to break on 64-bit compiles.
gcc gave no errors at all on a 386, and so the problem was detected only
after the merge.

Cheers
  Trond
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