Re: [BUG] perf script segfault

From: David Ahern
Date: Tue Apr 07 2015 - 19:41:18 EST

what happened to this patch? not in your core or urgent branches and perf-script is still bombing

On 3/31/15 7:36 AM, David Ahern wrote:
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
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@xxxxxxxxxx>
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@xxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
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;
+ 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->evlist, tool,

return session;

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

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at