linux-kernel - Re: [PATCH] perf stat: Fix segfault for event group in repeat mode

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Message-ID: <20190716184810.GF3624@kernel.org>
Date:   Tue, 16 Jul 2019 15:48:10 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Numfor Mbiziwo-Tiapo <nums@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Song Liu <songliubraving@...com>, mbd@...com,
        LKML <linux-kernel@...r.kernel.org>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH] perf stat: Fix segfault for event group in repeat mode

Em Mon, Jul 15, 2019 at 04:21:21PM +0200, Jiri Olsa escreveu:
> Numfor Mbiziwo-Tiapo reported segfault on stat of event
> group in repeat mode:
> 
>   # perf stat -e '{cycles,instructions}' -r 10 ls
> 
> It's caused by memory corruption due to not cleaned
> evsel's id array and index, which needs to be rebuilt
> in every stat iteration. Currently the ids index grows,
> while the array (which is also not freed) has the same
> size.
> 
> Fixing this by releasing id array and zeroing ids index
> in perf_evsel__close function.
> 
> We also need to keep the evsel_list alive for stat
> record (which is disabled in repeat mode).

Thanks, applied.

- Arnaldo