linux-kernel - Re: [BUG] perf script segfault

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Date:	Tue, 31 Mar 2015 07:36:56 -0600
From:	David Ahern <dsahern@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] perf script segfault

On 3/31/15 6:59 AM, Arnaldo Carvalho de Melo wrote:
> Em Mon, Mar 30, 2015 at 08:45:33PM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Mon, Mar 30, 2015 at 04:51:34PM -0600, David Ahern escreveu:
>>> tool was moved to ordered_events and is not initialized for pipe mode. I
>>> don't have time to look into it more than that before PTO on Wednesday.
>
>> I guess this one is enough, no? Checking with your example...
>
> So the following is better, can you give it a try, please?
>
> - Arnaldo
>
>
>  From fbd7d154f01c47db71a3d8b0546911872aa1de54 Mon Sep 17 00:00:00 2001
> From: Arnaldo Carvalho de Melo <acme@...hat.com>
> Date: Tue, 31 Mar 2015 09:53:50 -0300
> Subject: [PATCH 1/1] perf session: Always initialize ordered_events
>
> Even when it is not used to actually reorder events, some of its fields
> are used, like session->ordered_events->tool, to shorten function
> signatures where tool, for instance, was being passed, as the tool is
> needed for the ordered_events code, we need it there and might as well
> use it for other perf_session needs.
>
> This fixes a problem where 'perf script' had some condition that made
> session->ordered_events not to be initialized even with its
> script->tool ordered_events related flags asking for it to be, which
> looks like another bug and needs to be investigated further.
>
> Always initializing session->ordered_events at least leaves the current
> assumptions in place, so do it now.
>
> Reported-by: David Ahern <dsahern@...il.com>
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Borislav Petkov <bp@...e.de>
> Cc: Don Zickus <dzickus@...hat.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Jiri Olsa <jolsa@...hat.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Stephane Eranian <eranian@...gle.com>
> Link: http://lkml.kernel.org/n/tip-b1xxk0rwkz2a0gip1uufmjqg@git.kernel.org
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>   tools/perf/util/session.c | 5 ++---
>   1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> index adf0740c563b..89c66797abe4 100644
> --- a/tools/perf/util/session.c
> +++ b/tools/perf/util/session.c
> @@ -110,6 +110,8 @@ struct perf_session *perf_session__new(struct perf_data_file *file,
>
>   	session->repipe = repipe;
>   	machines__init(&session->machines);
> +	ordered_events__init(&session->ordered_events, &session->machines,
> +			     session->evlist, tool, ordered_events__deliver_event);
>
>   	if (file) {
>   		if (perf_data_file__open(file))
> @@ -139,9 +141,6 @@ struct perf_session *perf_session__new(struct perf_data_file *file,
>   	    tool->ordered_events && !perf_evlist__sample_id_all(session->evlist)) {
>   		dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
>   		tool->ordered_events = false;
> -	} else {
> -		ordered_events__init(&session->ordered_events, &session->machines,
> -				     session->evlist, tool, ordered_events__deliver_event);
>   	}
>
>   	return session;
>

Works for me. Reviewed-and-Tested-by: David Ahern <dsahern@...il.com>
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