After 5baecbc 'perf symbols: we can now read separate debug-info files based on
a build ID' and when --symfs option is used perf failed to pick up symbols for
file with the same name between host and sysroot specified by --symfs option.
One can see message like this:
bin/bash with build id 26f0062cb6950d4d1ab0fd9c43eae8b10ca42062 not found,
continuing without symbols
It happens because code added by 5baecbc opens files directly by dso->long_name
without symbol_conf.symfs consideration, which as result picks one from the
host. It reads its build ID and later even code finds another proper file in
directory pointed by --symfs perf ignores it because build id mismatches.
Fix is to use __symbol__join_symfs to adjust file name according to --symfs
setting. If no --symfs passed the operation would noop and picks the same host
file as before.
Also note in latter tree after 5baecbc commit additional check for
'!dso->has_build_id' was added, so to observe error condition 'perf record'
should run with --no-buildid, so perf.data itself would not have build id for
target binary in buildid perf section and 'perf report' will pass
'!dso->has_build_id' condition. Or target binary should not have build id, but
the same binary on host has build id, again '!dso->has_build_id' will pass in
this case and incorrect build id could be read if --symfs is used.
Fixes: 5baecbcd9c9a ("perf symbols: we can now read separate debug-info files
based on a build ID")
Signed-off-by: Victor Kamensky <kamen...@cisco.com>
Cc: xe-linux-exter...@cisco.com
Cc: Arnaldo Carvalho de Melo <a...@kernel.org>
Cc: Dima Kogan <d...@secretsauce.net>
Cc: Kan Liang <kan.li...@intel.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Ingo Molnar <mi...@redhat.com>
Cc: Alexander Shishkin <alexander.shish...@linux.intel.com>
Cc: Masami Hiramatsu <masami.hiramatsu...@hitachi.com>
Cc: Wang Nan <wangn...@huawei.com>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Chris Phlipot <cphlip...@gmail.com>
Cc: He Kuang <heku...@huawei.com>
Cc: Adrian Hunter <adrian.hun...@intel.com>
Cc: linux-kernel@vger.kernel.org
---
tools/perf/util/symbol.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index dc93940..70e389bc 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1460,9 +1460,11 @@ int dso__load(struct dso *dso, struct map *map)
* DSO_BINARY_TYPE__BUILDID_DEBUGINFO to work
*/
if (!dso->has_build_id &&
- is_regular_file(dso->long_name) &&
- filename__read_build_id(dso->long_name, build_id, BUILD_ID_SIZE) >
0)
+ is_regular_file(dso->long_name)) {
+ __symbol__join_symfs(name, PATH_MAX, dso->long_name);
+ if (filename__read_build_id(name, build_id, BUILD_ID_SIZE) > 0)
dso__set_build_id(dso, build_id);
+ }
/*
* Iterate over candidate debug images.
--
2.7.4
