From mboxrd@z Thu Jan 1 00:00:00 1970 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 547ED30B53C; Fri, 24 Apr 2026 20:44:20 +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=1777063460; cv=none; b=nnecT1pEeu3yOYvYKTaFv8U2Nb40tBhmt7eSK+At0MO8PHcqLDjnMF/Lac/7Xy35+x/VEwvTJfYSufqojviTq5w5Mi1/xQMdlN9dJ65/Ht2z6yTVZgA67jrhap+X/MCHk+SbEJ6PWf6Oa7P5QseWO0S7T5OSLvj1kgN4K7/rk8g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777063460; c=relaxed/simple; bh=aZIKvsuRPQmGIMJ3egP7+5rq2nJvA1CiL1WxzxfW2AU=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=C8lLNLUF4xu6AIE7Q6bEK1uszD0gqF6MasfZxCXSfNMBu+43kC6JUt5iYxnzhivLq7d9TJeGKiZa73iY5EnG/6+FwuotVZCl6gzjF4thkNrx8Skkl+LbtZKu76O4NvDzSuKnBgUGX5GIB9SATZibzCiaN3L1UNNo+X5tA+jECyY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=g4CexKW7; 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="g4CexKW7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E344FC19425; Fri, 24 Apr 2026 20:44:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777063460; bh=aZIKvsuRPQmGIMJ3egP7+5rq2nJvA1CiL1WxzxfW2AU=; h=From:To:Cc:Subject:Date:From; b=g4CexKW7X4pDXy1n3f2lR7KOa/i734igEKYhYbwLJ1GkSJovteAFLuKYo+yunXkEC qSIjScCAcU1+Jt386jZ7QCQLQk57tWVLsvGGiIrYLfMLlTvQa+KN0iLaK1s1lAnbmI +XqL36wJ7uY0D3xnAvjyTx+/+BoX7A/pTw72bBwOnXpAqqP0Q5seKkXLrjqWmiSCg7 t5GIpzoJ+oLFQPYu8MNMEyY1PeBfxJrikhWrQgtBN25R888y/cj9GBF6IBDKxSFruJ I9BtNCT32bwVd7Ps/hMjIVLdmmJUbyATM/Zbt3rmei7PytZQ5Ha77Fb3C7bARLnmZD PmUHsNIS54Gig== From: Tejun Heo To: David Vernet , Andrea Righi , Changwoo Min Cc: sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org, Emil Tsalapatis , Chris Mason , Ryan Newton , Tejun Heo Subject: [PATCHSET sched_ext/for-7.1-fixes] sched_ext: Assorted fixes Date: Fri, 24 Apr 2026 10:44:05 -1000 Message-ID: <20260424204418.3809733-1-tj@kernel.org> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hello, This patchset collects fixes for issues surfaced by Chris Mason's AI-assisted review of sched_ext. The bugs span use-after-free, leak, lock/state inconsistency, rq-lock AA deadlock, and cross-task kfunc misuse paths. Each patch stands on its own. Based on sched_ext/for-7.1-fixes (510a27055446). 1: sched_ext: Unregister sub_kset on scheduler disable 2: sched_ext: Guard scx_dsq_move() against NULL kit->dsq after failed iter_new 3: sched_ext: Skip tasks with stale task_rq in bypass_lb_cpu() 4: sched_ext: Don't disable tasks in scx_sub_enable_workfn() abort path 5: sched_ext: Read scx_root under scx_cgroup_ops_rwsem in cgroup setters 6: sched_ext: Resolve caller's scheduler in scx_bpf_destroy_dsq() / scx_bpf_dsq_nr_queued() 7: sched_ext: Use dsq->first_task instead of list_empty() in dispatch_enqueue() FIFO-tail 8: sched_ext: Save and restore scx_locked_rq across SCX_CALL_OP 9: sched_ext: Pass held rq to SCX_CALL_OP() for dump_cpu/dump_task 10: sched_ext: Pass held rq to SCX_CALL_OP() for core_sched_before 11: sched_ext: Make bypass LB cpumasks per-scheduler 12: sched_ext: Align cgroup #ifdef guards with SUB_SCHED vs GROUP_SCHED 13: sched_ext: Refuse cross-task select_cpu_from_kfunc calls Git tree: git://git.kernel.org/pub/scm/linux/kernel/git/tj/sched_ext.git fix-slop-review kernel/sched/ext.c | 238 +++++++++++++++++++++++++++++--------------- kernel/sched/ext_idle.c | 19 +++- kernel/sched/ext_internal.h | 2 + 3 files changed, 174 insertions(+), 85 deletions(-) Thanks. -- tejun