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Mon, 30 Mar 2026 21:02:23 -0400 X-MC-Unique: brngCdPJOnCsi5PsAzUHdw-1 X-Mimecast-MFC-AGG-ID: brngCdPJOnCsi5PsAzUHdw_1774918938 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (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-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 1F39D1956056; Tue, 31 Mar 2026 01:02:17 +0000 (UTC) Received: from fedora (unknown [10.72.116.5]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 70BB319560AB; Tue, 31 Mar 2026 01:01:52 +0000 (UTC) Date: Tue, 31 Mar 2026 09:01:48 +0800 From: Ming Lei To: Aaron Tomlin Cc: axboe@kernel.dk, kbusch@kernel.org, hch@lst.de, sagi@grimberg.me, mst@redhat.com, aacraid@microsemi.com, James.Bottomley@hansenpartnership.com, martin.petersen@oracle.com, liyihang9@h-partners.com, kashyap.desai@broadcom.com, sumit.saxena@broadcom.com, shivasharan.srikanteshwara@broadcom.com, chandrakanth.patil@broadcom.com, sathya.prakash@broadcom.com, sreekanth.reddy@broadcom.com, suganath-prabu.subramani@broadcom.com, ranjan.kumar@broadcom.com, jinpu.wang@cloud.ionos.com, tglx@kernel.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, akpm@linux-foundation.org, maz@kernel.org, ruanjinjie@huawei.com, bigeasy@linutronix.de, yphbchou0911@gmail.com, wagi@kernel.org, frederic@kernel.org, longman@redhat.com, chenridong@huawei.com, hare@suse.de, kch@nvidia.com, steve@abita.co, sean@ashe.io, chjohnst@gmail.com, neelx@suse.com, mproche@gmail.com, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org, megaraidlinux.pdl@broadcom.com, mpi3mr-linuxdrv.pdl@broadcom.com, MPT-FusionLinux.pdl@broadcom.com Subject: Re: [PATCH v9 00/13] blk: honor isolcpus configuration Message-ID: References: <20260330221047.630206-1-atomlin@atomlin.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260330221047.630206-1-atomlin@atomlin.com> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 On Mon, Mar 30, 2026 at 06:10:34PM -0400, Aaron Tomlin wrote: > Hi Jens, Keith, Christoph, Sagi, Michael, > > I have decided to drive this series forward on behalf of Daniel Wagner, the > original author. This iteration addresses the outstanding architectural and > concurrency concerns raised during the previous review cycle, and the series > has been rebased on v7.0-rc5-509-g545475aebc2a. > > Building upon prior iterations, this series introduces critical > architectural refinements to the mapping and affinity spreading algorithms > to guarantee thread safety and resilience against concurrent CPU-hotplug > operations. Previously, the block layer relied on a shared global static > mask (i.e., blk_hk_online_mask), which proved vulnerable to race conditions > during rapid hotplug events. This vulnerability was recently highlighted by > the kernel test robot, which encountered a NULL pointer dereference during > rcutorture (cpuhotplug) stress testing due to concurrent mask modification. Can you share the bug report link? IMO, it should be solved as a backportable patch first if possible. Thanks, Ming