From: Song Liu <songliubrav...@fb.com>
commit 9d49169c5958e429ffa6874fbef734ae7502ad65 upstream.
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.
Reported-by: David Carrillo Cisneros <davi...@fb.com>
Signed-off-by: Song Liu <songliubrav...@fb.com>
Tested-by: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Andi Kleen <a...@linux.intel.com>
Cc: Jiri Olsa <jo...@kernel.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: kernel-t...@fb.com
Cc: sta...@vger.kernel.org #v5.1+
Fixes: 3ab481a1cfe1 ("perf script: Support insn output for normal samples")
Link: http://lkml.kernel.org/r/20190621014438.810342-1-songliubrav...@fb.com
Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
tools/perf/builtin-script.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -3669,7 +3669,8 @@ int cmd_script(int argc, const char **ar
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;
