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

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Message-ID: <20150331125920.GE9438@kernel.org>
Date:	Tue, 31 Mar 2015 09:59:20 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Stephane Eranian <eranian@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] perf script segfault

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;
-- 
1.8.3.1

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