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
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