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perf sched: Fix thread reference leak in idle hist processing

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timehist_sched_change_event() sets itr->last_thread to NULL at the end
of idle hist processing without calling thread__put() first.  The
thread reference was acquired via thread__get() in timehist_get_thread()
(line 2581), so every idle context switch leaks a thread reference when
--idle-hist is active.

Use thread__zput() to properly release the reference before clearing
the pointer.

Fixes: 5d8f17fb5822 ("perf sched timehist: Add -I/--idle-hist option")
Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Assisted-by: Claude:claude-opus-4.6
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2026-06-05 11:15:58 -03:00
parent c9b3054c99
commit 662d56d48e
1 changed files with 1 additions and 1 deletions
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2
tools/perf/builtin-sched.c
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@ -2940,7 +2940,7 @@ static int timehist_sched_change_event(const struct perf_tool *tool,
if (itr->cursor.nr)
callchain_append(&itr->callchain, &itr->cursor, t - tprev);
itr->last_thread = NULL;
thread__zput(itr->last_thread);
}
if (!sched->summary_only)