From: Namhyung Kim <>

The hroot_in and hroot_out are roots of hierarchy trees of hist entries.

But when a hist entry is initialized by copying existing template entry,
it sometimes has non-empty tree and copies it incorrectly.  This is a
problem especially when an event group is used since it creates dummy
entries from already-processed entries in other event members.

Signed-off-by: Namhyung Kim <>
Cc: Andi Kleen <>
Cc: Jiri Olsa <>
Cc: Peter Zijlstra <>
Signed-off-by: Arnaldo Carvalho de Melo <>
 tools/perf/util/hist.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 702ba3a8ead6..37a08f20730a 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -417,6 +417,8 @@ static int hist_entry__init(struct hist_entry *he,
+       he->hroot_in  = RB_ROOT;
+       he->hroot_out = RB_ROOT;
        if (!symbol_conf.report_hierarchy)
                he->leaf = true;

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