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[188.141.5.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4834d5e11f5sm140669315e9.4.2026.02.11.13.30.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Feb 2026 13:30:35 -0800 (PST) From: David Carlier To: Tejun Heo , David Vernet Cc: linux-kernel@vger.kernel.org, David Carlier Subject: [PATCH] tools/sched_ext: scx_central: fix sched_setaffinity() call with the set size Date: Wed, 11 Feb 2026 21:30:27 +0000 Message-ID: <20260211213027.914485-1-devnexen@gmail.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The cpu set is dynamically allocated for nr_cpu_ids using CPU_ALLOC(), so the size passed to sched_setaffinity() should be CPU_ALLOC_SIZE() rather than sizeof(cpu_set_t). Valgrind flagged this as accessing unaddressable bytes past the allocation. Signed-off-by: David Carlier --- tools/sched_ext/scx_central.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/tools/sched_ext/scx_central.c b/tools/sched_ext/scx_central.c index 55931a4cd71c..a6dfd45de70c 100644 --- a/tools/sched_ext/scx_central.c +++ b/tools/sched_ext/scx_central.c @@ -50,6 +50,7 @@ int main(int argc, char **argv) __u64 seq =3D 0, ecode; __s32 opt; cpu_set_t *cpuset; + size_t cpuset_size; =20 libbpf_set_print(libbpf_print_fn); signal(SIGINT, sigint_handler); @@ -106,9 +107,10 @@ int main(int argc, char **argv) */ cpuset =3D CPU_ALLOC(skel->rodata->nr_cpu_ids); SCX_BUG_ON(!cpuset, "Failed to allocate cpuset"); - CPU_ZERO_S(CPU_ALLOC_SIZE(skel->rodata->nr_cpu_ids), cpuset); + cpuset_size =3D CPU_ALLOC_SIZE(skel->rodata->nr_cpu_ids); + CPU_ZERO_S(cpuset_size, cpuset); CPU_SET(skel->rodata->central_cpu, cpuset); - SCX_BUG_ON(sched_setaffinity(0, sizeof(*cpuset), cpuset), + SCX_BUG_ON(sched_setaffinity(0, cpuset_size, cpuset), "Failed to affinitize to central CPU %d (max %d)", skel->rodata->central_cpu, skel->rodata->nr_cpu_ids - 1); CPU_FREE(cpuset); --=20 2.51.0