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Date: Thu, 26 Nov 2015 10:09:26 +0100
From: Jiri Olsa <jolsa@redhat.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>, linux-kernel@vger.kernel.org,
        David Ahern <dsahern@gmail.com>, Jan Kratochvil <jkratoch@redhat.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Milian Wolff <milian.wolff@kdab.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Taeung Song <treeze.taeung@gmail.com>, Wang Nan <wangnan0@huawei.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: Re: [GIT PULL 0/7] perf/core improvements and fixes
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On Thu, Nov 26, 2015 at 09:12:37AM +0100, Ingo Molnar wrote:

SNIP

> fixdep: error opening depfile: ./.plugin_hrtimer.o.d: No such file or directory
> /home/mingo/tip/tools/build/Makefile.build:77: recipe for target 
> 'plugin_hrtimer.o' failed
> make[3]: *** [plugin_hrtimer.o] Error 2
> Makefile:189: recipe for target 'plugin_hrtimer-in.o' failed
> make[2]: *** [plugin_hrtimer-in.o] Error 2
> Makefile.perf:414: recipe for target 'libtraceevent_plugins' failed
> make[1]: *** [libtraceevent_plugins] Error 2
> make[1]: *** Waiting for unfinished jobs....
>   CC       plugin_kvm.o
>   CC       builtin-sched.o
>   CC       plugin_mac80211.o
>   LD       plugin_kmem-in.o
>   CC       util/help.o
> 
> Can you reproduce it by adding 'sleep 1' (or 'sleep 2') to the end of 
> util/PERF-VERSION-GEN? (See the patch attached further below.)
> 
> The failure is sporadic even with the 'sleep 1' hack - I get a build failure 1 out 
> of 3 times maybe:
> 
> triton:~/tip/tools/perf> while : ; do echo -n "$(date) "; make clean install >/tmp/FAIL.log 2>&1 && echo pass || { echo 'FAIL!'; break; } done
> Thu Nov 26 09:07:12 CET 2015 pass
> Thu Nov 26 09:07:23 CET 2015 FAIL!
> 
> Interestingly it does not reproduce if I use '>FAIL.log' - I need to output the 
> log into tmpfs - maybe the extra VFS synchronization if logging to the same 
> filesystem where the build occurs hides the race?
> 
> With V=1 it takes a lot longer to reproduce:
> 
> triton:~/tip/tools/perf> while : ; do echo -n "$(date) "; make clean install V=1 >/tmp/FAIL.log 2>&1 && echo pass || { echo 'FAIL!'; break; } done
> Thu Nov 26 09:08:08 CET 2015 pass
> Thu Nov 26 09:08:20 CET 2015 pass
> Thu Nov 26 09:08:32 CET 2015 pass
> Thu Nov 26 09:08:43 CET 2015 pass
> Thu Nov 26 09:08:55 CET 2015 pass
> Thu Nov 26 09:09:06 CET 2015 pass
> Thu Nov 26 09:09:17 CET 2015 pass
> Thu Nov 26 09:09:29 CET 2015 pass
> Thu Nov 26 09:09:41 CET 2015 FAIL!

so far no luck on my side.. from quick check over the fail log
it seems the patch I sent yesterday could help:

http://lkml.iu.edu/hypermail/linux/kernel/1511.3/00186.html

I'll have more detailed check on your fail log,

thanks,
jirka