From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 AB89BC8CE for ; Wed, 28 Jan 2026 04:43:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769575427; cv=none; b=WdEEzo8PWTlQtOtLcsxlI15C0nQaHn/Z/jypjnRHUSVWD1D2+JwNoo9wFKla0P/0CRIav15HSlrHEfd/r6guE4t/kNOnpRl/1dANlYu1UtSBYCsnDpc7khG8EojiGha2wSn6i6s9k+OKp/AwkE+1ARj/XHrkJQ+ce4nXEwZFwcc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769575427; c=relaxed/simple; bh=Na08qf2jeYA+I2H+hE/yjoqlFxSIRte5RSq8QCHGynw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=LwWOJ/EaiSf3+/pErI/WjuL1UyK7B/7MHJfbivSYVpq/+SVW3kqjv4Vp989O7YWiJVj71OBO75cZQMFPc/qhYGYTn5BXc9sP5a7dBOhtH/8zn1vEe+unX2bUTRXw309tT1n3ZES3R4arUYUI4ppnO42ULm6S+1KPe/kbRO5rrng= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=LNgNxgHV; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="LNgNxgHV" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1769575425; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=NaQ/CDnPwfTasasbEir9k1gSpnJdJQCwBstwGtlH3Gk=; b=LNgNxgHVhHLUGOMsK8uSouGrKBdhz+BLA5e+Kizh9A9Vpfck7+1LevkfFv0iRLih1Og594 SOvBxm4CVhFMjZhdQcFR27gx9zDyV+PKggetwl3C80w3jeqtVFimuOz5ULnVjAGK8OefgG s4CiHiouKE2Wza7z+lzV+s8rxOIp5jM= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-669-3eNpm5EMOw-pPkkrFRakSA-1; Tue, 27 Jan 2026 23:43:42 -0500 X-MC-Unique: 3eNpm5EMOw-pPkkrFRakSA-1 X-Mimecast-MFC-AGG-ID: 3eNpm5EMOw-pPkkrFRakSA_1769575420 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id A02CC1944F12; Wed, 28 Jan 2026 04:43:39 +0000 (UTC) Received: from llong-thinkpadp16vgen1.westford.csb (unknown [10.22.80.3]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id BA7861800947; Wed, 28 Jan 2026 04:43:34 +0000 (UTC) From: Waiman Long To: Chen Ridong , Tejun Heo , Johannes Weiner , =?UTF-8?q?Michal=20Koutn=C3=BD?= , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Anna-Maria Behnsen , Frederic Weisbecker , Thomas Gleixner , Shuah Khan Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Waiman Long Subject: [PATCH/for-next 0/2] cgroup/cpuset: Fix partition related locking issues Date: Tue, 27 Jan 2026 23:42:49 -0500 Message-ID: <20260128044251.1229702-1-longman@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 After booting the latest cgroup for-next debug kernel with the latest cgroup changes as well as Federic's "cpuset/isolation: Honour kthreads preferred affinity" patch series [1] merged on top and running the test-cpuset-prs.sh test, a circular locking dependency lockdep splat was reported. See patch 2 for details. The following changes are made to resolve this locking problem. 1) Deferring calling housekeeping_update() from CPU hotplug to task work 2) Release cpus_read_lock before calling housekeeping_update() With these changes, the cpuset test ran to completion with no failure and no lockdep splat. [1] https://lore.kernel.org/lkml/20260125224541.50226-1-frederic@kernel.org/ Waiman Long (2): cgroup/cpuset: Defer housekeeping_update() call from CPU hotplug to task_work cgroup/cpuset: Introduce a new top level isolcpus_update_mutex kernel/cgroup/cpuset.c | 124 ++++++++++++++---- kernel/sched/isolation.c | 4 +- kernel/time/timer_migration.c | 3 +- .../selftests/cgroup/test_cpuset_prs.sh | 9 ++ 4 files changed, 111 insertions(+), 29 deletions(-) -- 2.52.0