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[86.49.251.138]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4a1843cb261sm84563085e9.3.2026.10.08.10.08.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 08 Oct 2026 10:08:53 -0700 (PDT) Sender: Alban Crequy From: Alban Crequy X-Google-Original-From: Alban Crequy To: Sasha Levin Cc: Alban Crequy , gregkh@linuxfoundation.org, stable@vger.kernel.org, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, Peter Jung Subject: Re: [PATCH 7.1.y] Revert "tracing: perf: Fix stale head for perf syscall tracing" Date: Thu, 8 Oct 2026 17:08:31 +0000 Message-ID: <20261008170831.49376-1-albancrequy@microsoft.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260817150000.2@kernel.org> References: <20260816133101.83109-1-admin@ptr1337.dev> <20260817150000.2@kernel.org> Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi Sasha, Peter, Another data point: Ubuntu picked up the same backport in its 7.0 kernel (7.0.0-38-generic), and it breaks Inspektor Gadget and bpftrace in the same way. A BPF program on sys_enter_execve or sys_enter_openat only runs on CPU 0; sys_exit_* and sys_enter_close keep working on all CPUs. Reproducer: bpftrace -e 'tracepoint:syscalls:sys_enter_openat /comm == "cat"/ { @[cpu] = count(); }' & for c in $(seq 0 7); do taskset -c $c cat /etc/hostname >/dev/null; done Only @[0] shows up. I also tested v7.1.13 under QEMU with 4 CPUs, using a small cilium/ebpf test that counts per-CPU hits of a tracepoint program while running 10 syscalls pinned to each CPU: v7.1.13: sys_enter_openat [10 0 0 0], sys_enter_close [10 10 10 10], sys_exit_openat [10 10 10 10] v7.1.13 + revert: sys_enter_openat [10 10 10 10], sys_enter_close [10 10 10 10], sys_exit_openat [10 10 10 10] The revert looks right to me for 7.1.y, and for any other stable branch without 57918341dd19. Tested-by: Alban Crequy Alban