linux-kernel - Re: [PATCH v2 0/2] Fix srcline addr2line issue with the ',' sentinel

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Date:   Tue, 13 Jun 2023 12:02:41 +0800
From:   Changbin Du <changbin.du@...wei.com>
To:     Ian Rogers <irogers@...gle.com>
CC:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, <linux-perf-users@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <llvm@...ts.linux.dev>,
        Changbin Du <changbin.du@...wei.com>, <hw.huiwang@...wei.com>
Subject: Re: [PATCH v2 0/2] Fix srcline addr2line issue with the ',' sentinel

The problem is fixed, thanks!

Tested-by: Changbin Du <changbin.du@...wei.com>

On Mon, Jun 12, 2023 at 08:48:15PM -0700, Ian Rogers wrote:
> addr2line makes it hard to detect when inline output has finished. To
> detect it srcline issues a bogus ',' symbol and expects to see a
> filename:line of "??:0". For binutils addr2line ',' gets turned into
> address 0 and if there is a symbol there then the sentinel isn't
> detected, this problem has been occurring with kernel binaries.
> 
> The issue was reported by and debugged by Changbin Du <changbin.du@...wei.com>.
> 
> v2. Incorporate feedback from Changbin.
> 
> Ian Rogers (2):
>   perf srcline: Make addr2line configuration failure more verbose
>   perf srcline: Make sentinel reading for binutils addr2line more robust
> 
>  tools/perf/util/srcline.c | 93 ++++++++++++++++++++++++++++++---------
>  1 file changed, 73 insertions(+), 20 deletions(-)
> 
> -- 
> 2.41.0.162.gfafddb0af9-goog
> 

-- 
Cheers,
Changbin Du