From: Masami Hiramatsu <[email protected]>
In map_groups__find_symbol() map->map_ip is used without ensuring the
map is loaded. Then the address passed to map->map_ip isn't mapped at
the first time.
E.g. below code always fails to get a symbol at the first call;
addr = /* Somewhere in the kernel text */
symbol_conf.try_vmlinux_path = true;
symbol__init();
host_machine = machine__new_host();
sym = machine__find_kernel_function(host_machine,
addr, NULL, NULL);
/* Note that machine__find_kernel_function calls
map_groups__find_symbol */
This ensures it by calling map__load before using it in
map_groups__find_symbol().
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: "David A. Long" <[email protected]>
Cc: David Ahern <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Cc: Srikar Dronamraju <[email protected]>
Cc: "Steven Rostedt (Red Hat)" <[email protected]>
Cc: [email protected]
Link:
http://lkml.kernel.org/r/20140123022950.7206.17357.st...@kbuild-fedora.yrl.intra.hitachi.co.jp
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
---
tools/perf/util/map.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index ee1dd687a262..3b97513f0e77 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -386,7 +386,8 @@ struct symbol *map_groups__find_symbol(struct map_groups
*mg,
{
struct map *map = map_groups__find(mg, type, addr);
- if (map != NULL) {
+ /* Ensure map is loaded before using map->map_ip */
+ if (map != NULL && map__load(map, filter) >= 0) {
if (mapp != NULL)
*mapp = map;
return map__find_symbol(map, map->map_ip(map, addr), filter);
--
1.8.1.4
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