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perf symbols: Update kcore map before merging in remaining symbols
When loading kcore, the main vmlinux map is updated in the same loop
that merges the remaining maps. If a map that overlaps is merged in
before kcore, the list can become unsortable when the main map addresses
are updated. This will later trigger the check_invariants() assert:
$ perf record
$ perf report
util/maps.c:96: check_invariants: Assertion `map__end(prev) <=
map__start(map) || map__start(prev) == map__start(map)' failed.
Aborted
Fix it by moving the main map update prior to the loop so that
maps__merge_in() can split it if necessary.
Fixes: 659ad3492b
("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/20240507141210.195939-4-james.clark@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
parent
fd81f52e31
commit
f30232b20f
1 changed files with 21 additions and 19 deletions
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@ -1290,7 +1290,7 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
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{
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{
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struct maps *kmaps = map__kmaps(map);
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struct maps *kmaps = map__kmaps(map);
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struct kcore_mapfn_data md;
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struct kcore_mapfn_data md;
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struct map *replacement_map = NULL;
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struct map *map_ref, *replacement_map = NULL;
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struct machine *machine;
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struct machine *machine;
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bool is_64_bit;
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bool is_64_bit;
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int err, fd;
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int err, fd;
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@ -1368,6 +1368,24 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
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if (!replacement_map)
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if (!replacement_map)
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replacement_map = list_entry(md.maps.next, struct map_list_node, node)->map;
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replacement_map = list_entry(md.maps.next, struct map_list_node, node)->map;
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/*
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* Update addresses of vmlinux map. Re-insert it to ensure maps are
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* correctly ordered. Do this before using maps__merge_in() for the
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* remaining maps so vmlinux gets split if necessary.
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*/
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map_ref = map__get(map);
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maps__remove(kmaps, map_ref);
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map__set_start(map_ref, map__start(replacement_map));
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map__set_end(map_ref, map__end(replacement_map));
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map__set_pgoff(map_ref, map__pgoff(replacement_map));
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map__set_mapping_type(map_ref, map__mapping_type(replacement_map));
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err = maps__insert(kmaps, map_ref);
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map__put(map_ref);
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if (err)
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goto out_err;
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/* Add new maps */
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/* Add new maps */
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while (!list_empty(&md.maps)) {
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while (!list_empty(&md.maps)) {
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struct map_list_node *new_node = list_entry(md.maps.next, struct map_list_node, node);
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struct map_list_node *new_node = list_entry(md.maps.next, struct map_list_node, node);
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@ -1375,24 +1393,8 @@ static int dso__load_kcore(struct dso *dso, struct map *map,
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list_del_init(&new_node->node);
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list_del_init(&new_node->node);
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if (RC_CHK_EQUAL(new_map, replacement_map)) {
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/* skip if replacement_map, already inserted above */
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struct map *map_ref;
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if (!RC_CHK_EQUAL(new_map, replacement_map)) {
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/* Ensure maps are correctly ordered */
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map_ref = map__get(map);
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maps__remove(kmaps, map_ref);
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map__set_start(map_ref, map__start(new_map));
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map__set_end(map_ref, map__end(new_map));
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map__set_pgoff(map_ref, map__pgoff(new_map));
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map__set_mapping_type(map_ref, map__mapping_type(new_map));
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err = maps__insert(kmaps, map_ref);
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map__put(map_ref);
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map__put(new_map);
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if (err)
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goto out_err;
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} else {
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/*
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/*
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* Merge kcore map into existing maps,
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* Merge kcore map into existing maps,
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* and ensure that current maps (eBPF)
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* and ensure that current maps (eBPF)
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