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([2601:282:1e02:1040:856a:da39:d9b3:fb8f]) by smtp.googlemail.com with ESMTPSA id 586e51a60fabf-440d8297395sm10158925fac.11.2026.06.06.08.47.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 06 Jun 2026 08:47:51 -0700 (PDT) Message-ID: <11689da4-fd35-4177-be03-8bbd750dbe8f@gmail.com> Date: Sat, 6 Jun 2026 09:47:50 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 7/9] perf sched: Fix thread reference leak in idle hist processing Content-Language: en-US To: Arnaldo Carvalho de Melo , Namhyung Kim Cc: Ingo Molnar , Thomas Gleixner , James Clark , Jiri Olsa , Ian Rogers , Adrian Hunter , Clark Williams , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, Arnaldo Carvalho de Melo , sashiko-bot , "Claude Opus 4.6" References: <20260605233837.1773732-1-acme@kernel.org> <20260605233837.1773732-8-acme@kernel.org> From: David Ahern In-Reply-To: <20260605233837.1773732-8-acme@kernel.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 6/5/26 5:38 PM, Arnaldo Carvalho de Melo wrote: > From: Arnaldo Carvalho de Melo > > 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 > Cc: David Ahern > Cc: Namhyung Kim > Assisted-by: Claude Opus 4.6 > Signed-off-by: Arnaldo Carvalho de Melo > --- > tools/perf/builtin-sched.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > Reviewed-by: David Ahern