From nobody Fri Dec 19 10:41:04 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 61B9D28AAF9; Thu, 9 Oct 2025 23:56:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760054185; cv=none; b=jAqcB3oJ/k+k/rodf1CjqIfqxtCzKPLRY2UxSBQNWibb9+VS9JoFnbStwdUJMWSKp/TWc8RDGb0N/S8Fbg6bKZxQO5/ctCDY3UJYwQRWEaqrD43BIEOoMvKab3JTf7LJJwznVoxR9QQ+xgjQ/sbSSeBT3gdAPwR1IXwMkDCsG08= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760054185; c=relaxed/simple; bh=fpoEBaXfc7p9qNaa/8UsDw15nv+ev3tq7W/P+MBiaAA=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=C2ENyLuoHO6YtjOHLkk1lasJgLRoORwnLQ8WiSQPqYn3K5/FTUKPeEtRgDA6zqBqdpNipQ3es6vtT5M8eXopsQrsBHw0d0YlCloZ/kOePfi8d9qMiPqUiHb3dGxz3IFEFtKtT2pCrgWiiKjqRg5q0Y5M9fifZ8F7vlnXjQ/YhVY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FXI8IJnL; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FXI8IJnL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B1490C4CEE7; Thu, 9 Oct 2025 23:56:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760054184; bh=fpoEBaXfc7p9qNaa/8UsDw15nv+ev3tq7W/P+MBiaAA=; h=From:To:Cc:Subject:Date:From; b=FXI8IJnLfTNwyYwLL0djeYmCvJ5jC9LahQOu2aBcilpuD0E5ZfFlzePv2u5tKIYsB m0/9rI84lsGDHySJ8NaCguHo0M3K1yuDHeK978Sskb+VV2kqi9gbqMnHEbV2EG6TCQ f+j6Dos05VKNHnv4gxG+O6iN9pe8qLOv8t7HW1dZtNRAxiKpvI/t+qozpRx+rlBmvu mQDk+Ti4PYGKLOIKt5AJBmUD+I79eSQtLrVJMu1tlxh/yw4VJZeQ4xNK/GwZrlFUtT XMDVappU87cPoKEUsOO1X4DpYu4roh8nCVvkksZ0rUR8v8rCUCRKANbZYr3O2Z4zAv PafNxcj2QXxVg== From: Tejun Heo To: David Vernet , Andrea Righi , Changwoo Min Cc: linux-kernel@vger.kernel.org, sched-ext@lists.linux.dev, Tejun Heo Subject: [PATCH sched_ext/for-6.18-fixes] sched_ext: Sync error_irq_work before freeing scx_sched Date: Thu, 9 Oct 2025 13:56:23 -1000 Message-ID: <20251009235623.4135746-1-tj@kernel.org> 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" By the time scx_sched_free_rcu_work() runs, the scx_sched is no longer reachable. However, a previously queued error_irq_work may still be pending= or running. Ensure it completes before proceeding with teardown. Fixes: bff3b5aec1b7 ("sched_ext: Move disable machinery into scx_sched") Signed-off-by: Tejun Heo Acked-by: Andrea Righi --- kernel/sched/ext.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/sched/ext.c b/kernel/sched/ext.c index XXXXXXXX..XXXXXXXX 100644 --- a/kernel/sched/ext.c +++ b/kernel/sched/ext.c @@ -3471,7 +3471,9 @@ static void scx_sched_free_rcu_work(struct rcu_work *= rwork) struct scx_dispatch_q *dsq; int node; + irq_work_sync(&sch->error_irq_work); kthread_stop(sch->helper->task); + free_percpu(sch->pcpu); for_each_node_state(node, N_POSSIBLE) -- 2.48.0