linux-kernel - [PATCH] perf-script: assume native

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Date:   Thu, 20 Jun 2019 18:44:38 -0700
From:   Song Liu <songliubraving@...com>
To:     <linux-kernel@...r.kernel.org>
CC:     <kernel-team@...com>, <acme@...hat.com>, <davidca@...com>,
        <jolsa@...nel.org>, <namhyung@...nel.org>, <ak@...ux.intel.com>,
        Song Liu <songliubraving@...com>, <stable@...r.kernel.org>
Subject: [PATCH] perf-script: assume native_arch for pipe mode

In pipe mode, session->header.env.arch is not populated until the events
are processed. Therefore, the following command crashes:

   perf record -o - | perf script

(gdb) bt

It fails when we try to compare env.arch against uts.machine:

        if (!strcmp(uts.machine, session->header.env.arch) ||
            (!strcmp(uts.machine, "x86_64") &&
             !strcmp(session->header.env.arch, "i386")))
                native_arch = true;

In pipe mode, it is tricky to find env.arch at this stage. To keep it
simple, let's just assume native_arch is always true for pipe mode.

Cc: stable@...r.kernel.org #v5.1+
Fixes: 3ab481a1cfe1 ("perf script: Support insn output for normal samples")
Reported-by: David Carrillo Cisneros <davidca@...com>
Signed-off-by: Song Liu <songliubraving@...com>
---
 tools/perf/builtin-script.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 61f00055476a..3355af25e7d0 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -3733,7 +3733,8 @@ int cmd_script(int argc, const char **argv)
 		goto out_delete;
 
 	uname(&uts);
-	if (!strcmp(uts.machine, session->header.env.arch) ||
+	if (data.is_pipe ||  /* assume pipe_mode indicates native_arch */
+	    !strcmp(uts.machine, session->header.env.arch) ||
 	    (!strcmp(uts.machine, "x86_64") &&
 	     !strcmp(session->header.env.arch, "i386")))
 		native_arch = true;
-- 
2.17.1