linux-kernel - Re: linux-next: build failure after merge of the tip tree

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Message-ID: <20161207081215.GA13808@krava>
Date:   Wed, 7 Dec 2016 09:12:15 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Arnaldo Carvalho de Melo <acme@...radead.org>,
        Peter Foley <pefoley2@...oley.com>,
        Wang Nan <wangnan0@...wei.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-next@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: linux-next: build failure after merge of the tip tree

On Wed, Dec 07, 2016 at 08:45:14AM +0100, Ingo Molnar wrote:

SNIP

> * Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> 
> > Hi all,
> > 
> > After merging the tip tree, today's linux-next build (powerpc64le perf)
> > failed like this:
> > 
> >   LINK     /home/sfr/next/perf/fixdep
> > /bin/sh: 1: /home/sfr/next/perf//fixdep: Permission denied
> > tools/build/Makefile.build:91: recipe for target '/home/sfr/next/perf/pmu-events/jevents.o' failed
> > 
> > $ ls -l /home/sfr/next/perf/fixdep
> > -rwxr-xr-x 1 sfr users 71104 Dec  7 12:26 /home/sfr/next/perf/fixdep
> > 
> > I am not sure what caused this, but redoing the build succeeded, so I
> > have just filed this report and left it for today.

this seems to be the rare race issue caused by missing fixdep dependency,
caused probably by recompiling of fixdep because of its change in the merge

Arnaldo already carries a fix for this in his latest perf/core, where
we moved the fixdep compilation on top of everything to kill any future
race due to missing fixdep dependency

thanks,
jirka