linux-kernel - Re: [PATCH] perf test: Avoid an msan warning in a copied stack.

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Message-ID: <20201116172920.GI509215@kernel.org>
Date:   Mon, 16 Nov 2020 14:29:20 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com,
        Stephane Eranian <eranian@...gle.com>,
        Sandeep Dasgupta <sdasgup@...gle.com>
Subject: Re: [PATCH] perf test: Avoid an msan warning in a copied stack.

Em Fri, Nov 13, 2020 at 10:20:53AM -0800, Ian Rogers escreveu:
> This fix is for a failure that occurred in the DWARF unwind perf test.
> Stack unwinders may probe memory when looking for frames. Memory
> sanitizer will poison and track uninitialized memory on the stack, and
> on the heap if the value is copied to the heap. This can lead to false
> memory sanitizer failures for the use of an uninitialized value. Avoid
> this problem by removing the poison on the copied stack.
> 
> The full msan failure with track origins looks like:



Thanks, applied.

- Arnaldo