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charset=UTF-8 Content-Transfer-Encoding: 8bit From: Namhyung Kim We can't just replacing the map in the maps_by_address and not touching on the maps_by_name, that would leave the refcount as 1 and thus trip another consistency check, this one: perf: util/maps.c:110: check_invariants: Assertion `refcount_read(map__refcnt(map)) > 1' failed. 106 /* 107 * Maps by name maps should be in maps_by_address, so 108 * the reference count should be higher. 109 */ 110 assert(refcount_read(map__refcnt(map)) > 1); Committer notice: Initialize the newly added 'ni' variable, that really can't be accessed unitialized trips some gcc versions, like: 12 20.00 archlinux:base : FAIL gcc version 13.2.1 20230801 (GCC) util/maps.c: In function ‘__maps__fixup_overlap_and_insert’: util/maps.c:896:54: error: ‘ni’ may be used uninitialized [-Werror=maybe-uninitialized] 896 | map__put(maps_by_name[ni]); | ^ util/maps.c:816:25: note: ‘ni’ was declared here 816 | unsigned int i, ni; | ^~ cc1: all warnings being treated as errors make[3]: *** [/git/perf-6.14.0-rc1/tools/build/Makefile.build:138: util] Error 2 Reported-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim Tested-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Ian Rogers Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Kan Liang Cc: Peter Zijlstra Cc: Stephane Eranian Link: https://lore.kernel.org/lkml/Z79std66tPq-nqsD@google.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/maps.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/tools/perf/util/maps.c b/tools/perf/util/maps.c index 8c5f5d79cd24a6bc..77df9701d5ad7de3 100644 --- a/tools/perf/util/maps.c +++ b/tools/perf/util/maps.c @@ -813,7 +813,7 @@ static int __maps__fixup_overlap_and_insert(struct maps *maps, struct map *new) { int err = 0; FILE *fp = debug_file(); - unsigned int i; + unsigned int i, ni = INT_MAX; // Some gcc complain, but depends on maps_by_name... if (!maps__maps_by_address_sorted(maps)) __maps__sort_by_address(maps); @@ -824,6 +824,7 @@ static int __maps__fixup_overlap_and_insert(struct maps *maps, struct map *new) */ for (i = first_ending_after(maps, new); i < maps__nr_maps(maps); ) { struct map **maps_by_address = maps__maps_by_address(maps); + struct map **maps_by_name = maps__maps_by_name(maps); struct map *pos = maps_by_address[i]; struct map *before = NULL, *after = NULL; @@ -843,6 +844,9 @@ static int __maps__fixup_overlap_and_insert(struct maps *maps, struct map *new) map__fprintf(pos, fp); } + if (maps_by_name) + ni = maps__by_name_index(maps, pos); + /* * Now check if we need to create new maps for areas not * overlapped by the new map: @@ -887,6 +891,12 @@ static int __maps__fixup_overlap_and_insert(struct maps *maps, struct map *new) if (before) { map__put(maps_by_address[i]); maps_by_address[i] = before; + + if (maps_by_name) { + map__put(maps_by_name[ni]); + maps_by_name[ni] = map__get(before); + } + /* Maps are still ordered, go to next one. */ i++; if (after) { @@ -908,6 +918,12 @@ static int __maps__fixup_overlap_and_insert(struct maps *maps, struct map *new) */ map__put(maps_by_address[i]); maps_by_address[i] = map__get(new); + + if (maps_by_name) { + map__put(maps_by_name[ni]); + maps_by_name[ni] = map__get(new); + } + err = __maps__insert_sorted(maps, i + 1, after, NULL); map__put(after); check_invariants(maps); @@ -926,6 +942,12 @@ static int __maps__fixup_overlap_and_insert(struct maps *maps, struct map *new) */ map__put(maps_by_address[i]); maps_by_address[i] = map__get(new); + + if (maps_by_name) { + map__put(maps_by_name[ni]); + maps_by_name[ni] = map__get(new); + } + check_invariants(maps); return err; } -- 2.48.1