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

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Date:	Mon, 30 Mar 2015 20:45:33 -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 04:51:34PM -0600, David Ahern escreveu:
> Surprised Stephane has not hit this one yet:
> 
> $ perf record -e <any-event> -a | perf script
> Segmentation fault (core dumped)
> 
> It's the second one that core dumps.
> 
> $ gdb perf core.16704
> ...
> [New LWP 16704]
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
> Core was generated by `/tmp/perf/perf script'.
> Program terminated with signal SIGSEGV, Segmentation fault.
> #0  perf_tool__fill_defaults (tool=tool@...ry=0x0) at util/session.c:259
> 259		if (tool->sample == NULL)
> ...
> (gdb) bt
> #0  perf_tool__fill_defaults (tool=tool@...ry=0x0) at util/session.c:259
> #1  0x00000000004a5baa in __perf_session__process_pipe_events
> (session=0x2178b80) at util/session.c:1178
> #2  perf_session__process_events (session=0x2178b80) at util/session.c:1416
> #3  0x000000000043c5dc in __cmd_script (script=0x7fffc7a4d840) at
> builtin-script.c:803
> #4  cmd_script (argc=<optimized out>, argv=<optimized out>,
> prefix=<optimized out>) at builtin-script.c:1840
> ...
> 
> 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...


diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index adf0740c563b..f0c8dc519db0 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -139,6 +139,7 @@ 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;
+		session->ordered_events.tool = tool;
 	} else {
 		ordered_events__init(&session->ordered_events, &session->machines,
 				     session->evlist, tool, ordered_events__deliver_event);
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