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From:   Milian Wolff <milian.wolff@kdab.com>
To:     Jiri Olsa <jolsa@redhat.com>
Cc:     ahmadkhorrami <ahmadkhorrami@ut.ac.ir>,
        Steven Rostedt <rostedt@goodmis.org>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Linux-trace Users <linux-trace-users@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        linux-trace-users-owner@vger.kernel.org,
        Jin Yao <yao.jin@linux.intel.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Andi Kleen <ak@linux.intel.com>
Subject: Re: Wrong Perf Backtraces
Date:   Mon, 30 Mar 2020 08:09:53 +0200
Message-ID: <2522580.mvXUDI8C0e@agathebauer>
Organization: KDAB
In-Reply-To: <20200329192010.GA2361248@krava>
References: <821540886fc57d7749edee585a50602f@ut.ac.ir>
 <1867036.PIDvDuAF1L@agathebauer> <20200329192010.GA2361248@krava>
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On Sonntag, 29. M=E4rz 2020 21:20:10 CEST Jiri Olsa wrote:
> On Sun, Mar 29, 2020 at 03:50:57PM +0200, Milian Wolff wrote:
> > On Sonntag, 29. M=E4rz 2020 14:39:33 CEST ahmadkhorrami wrote:
> > > Thanks. I did both of your changes. Perhaps some outputs are revised.
> > > But I still have repeated function calls and the script detects them.
> >=20
> > > Here is one of them when the sampling period is 1000 events:
> > <snip>
> >=20
> > > Here, we have two consecutive "7f91788120b5
> > > gtk_widget_propagate_state+0x195
> > > (/usr/lib/x86_64-linux-gnu/libgtk-3.so.0.2200.30) gtkwidget.c:0" line=
s,
> > > while "gtk_widget_propagate_state+0x195" is not recursive. It should
> > > call "gtk_container_forall", which does not occur even after the seco=
nd
> > > (inner) call.
> >=20
> > Potentially you are just lacking some debug symbols here for this GTK
> > library. note that "gtkwidget.c:0" is bogus already - the line numbers
> > start with 1, so
> could we just skip those then? pass on all zero lined inlines
> and not add/display them

I guess so - but quite frankly I'm a bit uneasy to do this without further=
=20
exploration about the actual causes here. Afaik DWARF does not say anything=
=20
about the validity, so in theory there might be some language/compiler that=
=20
encodes valid DWARF locations with line 0?

Generally, it would be quite interesting to figure out why there is /some/=
=20
DWARF data here such that the code thinks it's able to decode the inline fr=
ame=20
but then fails and leads to this confusing result?

Cheers
=2D-=20
Milian Wolff | milian.wolff@kdab.com | Senior Software Engineer
KDAB (Deutschland) GmbH, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt, C++ and OpenGL Experts
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