Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 984C929E10B for ; Wed, 9 Sep 2026 01:53:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788918827; cv=none; b=lNFybEQGqclrPx8RS84KRyVMVffvKOhAe1/3aUis7OkIPab0H0QwFJcYnplAbRYnhDHY3sHvImL0YoPUYTXTPjKc9x1i5BhbgLPgUnsDtelFyrh6qlxfyqOGIaI1mjQRTPE1xFWgEQ8L6DoUabFyQWfCmNb841evvkxgSxc098o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788918827; c=relaxed/simple; bh=tXsdZaq9rVu9BvgKiNbRENC2bzD5QJl7XYNoLxKmMws=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=PJ5kU8LsH7r+FgSqyus+k13kJV3RaWYAPsQfQyaa+RDU1Nu+fkaKceXzY0EMLHK9emtPIA9Po/yolTPsBFUsV/jvVem6TFtQavYONo/rVmCTZzhWbG1he5uFBtHD3pbTiqbBK8MK22wB5VNy6PymQoAUB0lm9qfDVDX24syIpEI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IikMc9e2; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="IikMc9e2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9160F1F00A3A; Wed, 9 Sep 2026 01:53:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788918826; bh=qv8s+lRRz5rCE3Uv1NhX0VbQfuKzTEGZmzaCd5h1Vps=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=IikMc9e2sU+cIP37/dJ+JipIyk7kfFXNMmz0i3ogR249KrWDRmDNd1C7NKCFXTNBh H+zyy7fkwfFyWQMcZkQkJjgvMNmWV4U+OZKrpL+CffCkwHcR44ziCfZynkGev5RNfP u52SyXQ3VJGm/Q4mRS+1ANpwz52ccB1Ymf/HSh7pGKDeSVQTAeHFBfsR4aSV4Wu6vG /xL04zyF14DxRyMIA5tvcPhSAmIWpjXO9awLFgza+wN4ApfzvtaIUqP6mP91uhxi/Y F3y2fJ2az8G2jaLV53VX+SML6Nu5H6euQtpXfYdy+tEDnByWoOv4REmku9fruz+jr4 qslAX3HAUs2mQ== From: Sasha Levin To: stable@vger.kernel.org Cc: fangqiurong , Tejun Heo , Sasha Levin Subject: [PATCH 6.18.y] sched_ext: Fix exit_task leak on fork failure during enable Date: Tue, 8 Sep 2026 21:53:44 -0400 Message-ID: <20260909015344.949840-1-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <2026090320-scrooge-flashing-ac37@gregkh> References: <2026090320-scrooge-flashing-ac37@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: fangqiurong [ Upstream commit 03506edca637a8465dba9f635c50e9884fbcaf4e ] scx_fork() initializes tasks when scx_init_task_enabled is set, but scx_cancel_fork() only exits them when scx_enabled() is true. A fork that fails in the enable window (between releasing scx_fork_rwsem and setting __scx_enabled) runs ops.init_task() but never ops.exit_task(). Gate scx_cancel_fork() on scx_init_task_enabled. Fixes: 4269c603cc26 ("sched_ext: Enable scx_ops_init_task() separately") Cc: stable@vger.kernel.org # v6.12+ Signed-off-by: fangqiurong Signed-off-by: Tejun Heo [ Adjusted the target file path from kernel/sched/ext/ext.c to kernel/sched/ext.c. ] Signed-off-by: Sasha Levin --- kernel/sched/ext.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index b5f95b379ea6c..a8a507988e419 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -3007,7 +3007,7 @@ void scx_post_fork(struct task_struct *p) void scx_cancel_fork(struct task_struct *p) { - if (scx_enabled()) { + if (scx_init_task_enabled) { struct rq *rq; struct rq_flags rf; -- 2.53.0