From: Song Liu songliubraving@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 davidca@fb.com Signed-off-by: Song Liu songliubraving@fb.com Tested-by: Arnaldo Carvalho de Melo acme@redhat.com Cc: Andi Kleen ak@linux.intel.com Cc: Jiri Olsa jolsa@kernel.org Cc: Namhyung Kim namhyung@kernel.org Cc: kernel-team@fb.com Cc: stable@vger.kernel.org #v5.1+ Fixes: 3ab481a1cfe1 ("perf script: Support insn output for normal samples") Link: http://lkml.kernel.org/r/20190621014438.810342-1-songliubraving@fb.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@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;