On Tue, Nov 4, 2025 at 1:38 AM jingxian.li jingxian.li@shopee.com wrote:

This reverts commit e5de9ea7796e79f3cd082624f788cc3442bff2a8.

The patch introduced `map__zput(new_node->map)` in the kcore load path, causing a segmentation fault when running `perf c2c report`.

The issue arises because `maps__merge_in` directly modifies and inserts the caller's `new_map`, causing it to be freed prematurely while still referenced by kmaps.

Later branchs (6.12, 6.15, 6.16) are not affected because they use a different merge approach with a lazily sorted array, which avoids modifying the original `new_map`.

Fixes: e5de9ea7796e ("perf dso: Add missed dso__put to dso__load_kcore")

Signed-off-by: jingxian.li jingxian.li@shopee.com

Thanks for triaging this and the backport fix!

Acked-by: Ian Rogers irogers@google.com

---

tools/perf/util/symbol.c | 1 - 1 file changed, 1 deletion(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index 4f0bbebcb6d6..ea24f21aafc3 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -1366,7 +1366,6 @@ static int dso__load_kcore(struct dso *dso, struct map *map, goto out_err; } }

•           map__zput(new_node->map);
            free(new_node);
    }
  
  

-- 2.43.0