linux-kernel - Re: [PATCH] perf, script: Fix crash with printing mixed trace point and other events

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Date:   Fri, 18 Jan 2019 09:59:20 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Andi Kleen <andi@...stfloor.org>, jolsa@...nel.org,
        linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf, script: Fix crash with printing mixed trace point
 and other events

Em Fri, Jan 18, 2019 at 10:49:19AM +0100, Jiri Olsa escreveu:
> On Thu, Jan 17, 2019 at 11:48:34AM -0800, Andi Kleen wrote:
> > From: Andi Kleen <ak@...ux.intel.com>

> > perf script crashes currently when printing mixed trace points and other
> > events because the trace format does not handle events without trace
> > meta data. Add a simple check to avoid that.

> > % cat > test.c
> > main()
> > {
> >     printf("Hello world\n");
> > }
> > ^D
> > % gcc -g -o test test.c
> > % sudo perf probe -x test 'test.c:3'
> > % perf record -e '{cpu/cpu-cycles,period=10000/,probe_test:main}:S' ./test
> > % perf script
> > <segfault>

> > Signed-off-by: Andi Kleen <ak@...ux.intel.com>
 
> Acked-by: Jiri Olsa <jolsa@...nel.org>

Thanks, tested and applied.

While testing I found something odd, the cycles events are not showing
the CPU and the probe events shows a "negative" CPU column,
investigating.

- Arnaldo