From: James Clark <james.clark@arm.com>
Date: Tue, 7 May 2024 14:12:05 +0000 (+0100)
Subject: perf symbols: Remove map from list before updating addresses
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=9fe410a7ef483a9aca08bf620d8ddfd35ac99bc7;p=linux.git

perf symbols: Remove map from list before updating addresses

Make the order of operations remove, update, add. Updating addresses
before the map is removed causes the ordering check to fail when the map
is removed. This can be reproduced when running Perf on an Arm system
with a static kernel and Perf uses kcore rather than other sources:

  $ perf record -- ls
  $ perf report

  util/maps.c:96: check_invariants: Assertion `map__end(prev) <=
    map__start(map) || map__start(prev) == map__start(map)' failed

Fixes: 659ad3492b913c90 ("perf maps: Switch from rbtree to lazily sorted array for addresses")
Signed-off-by: James Clark <james.clark@arm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240507141210.195939-2-james.clark@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index eb3319baa1b52..0d4de786358d3 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1378,13 +1378,15 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
 		if (RC_CHK_EQUAL(new_map, replacement_map)) {
 			struct map *map_ref;
 
-			map__set_start(map, map__start(new_map));
-			map__set_end(map, map__end(new_map));
-			map__set_pgoff(map, map__pgoff(new_map));
-			map__set_mapping_type(map, map__mapping_type(new_map));
 			/* Ensure maps are correctly ordered */
 			map_ref = map__get(map);
 			maps__remove(kmaps, map_ref);
+
+			map__set_start(map_ref, map__start(new_map));
+			map__set_end(map_ref, map__end(new_map));
+			map__set_pgoff(map_ref, map__pgoff(new_map));
+			map__set_mapping_type(map_ref, map__mapping_type(new_map));
+
 			err = maps__insert(kmaps, map_ref);
 			map__put(map_ref);
 			map__put(new_map);