From: Ming Lei <ming.lei@redhat•com>
To: Aaron Tomlin <atomlin@atomlin•com>
Cc: axboe@kernel•dk, kbusch@kernel•org, hch@lst•de, sagi@grimberg•me,
mst@redhat•com, aacraid@microsemi•com,
James.Bottomley@hansenpartnership•com,
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kashyap.desai@broadcom•com, sumit.saxena@broadcom•com,
shivasharan.srikanteshwara@broadcom•com,
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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,
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MPT-FusionLinux.pdl@broadcom•com
Subject: Re: [PATCH v9 00/13] blk: honor isolcpus configuration
Date: Tue, 31 Mar 2026 09:01:48 +0800 [thread overview]
Message-ID: <acsc_GHv7Q04U1db@fedora> (raw)
In-Reply-To: <20260330221047.630206-1-atomlin@atomlin.com>
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
next prev parent reply other threads:[~2026-03-31 1:02 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-30 22:10 [PATCH v9 00/13] blk: honor isolcpus configuration Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 01/13] scsi: aacraid: use block layer helpers to calculate num of queues Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 02/13] lib/group_cpus: remove dead !SMP code Aaron Tomlin
2026-04-01 12:29 ` Sebastian Andrzej Siewior
2026-04-01 19:31 ` Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 03/13] lib/group_cpus: Add group_mask_cpus_evenly() Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 04/13] genirq/affinity: Add cpumask to struct irq_affinity Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 05/13] blk-mq: add blk_mq_{online|possible}_queue_affinity Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 06/13] nvme-pci: use block layer helpers to constrain queue affinity Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 07/13] scsi: Use " Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 08/13] virtio: blk/scsi: use " Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 09/13] isolation: Introduce io_queue isolcpus type Aaron Tomlin
2026-04-01 12:49 ` Sebastian Andrzej Siewior
2026-04-01 19:05 ` Waiman Long
2026-04-02 7:58 ` Sebastian Andrzej Siewior
2026-04-03 1:54 ` Waiman Long
2026-04-01 20:58 ` Aaron Tomlin
2026-04-02 9:09 ` Sebastian Andrzej Siewior
2026-04-03 0:50 ` Aaron Tomlin
2026-04-03 1:20 ` Ming Lei
2026-03-30 22:10 ` [PATCH v9 10/13] blk-mq: use hk cpus only when isolcpus=io_queue is enabled Aaron Tomlin
2026-03-31 23:05 ` Keith Busch
2026-04-01 17:16 ` Aaron Tomlin
2026-04-03 1:43 ` Ming Lei
2026-03-30 22:10 ` [PATCH v9 11/13] blk-mq: prevent offlining hk CPUs with associated online isolated CPUs Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 12/13] genirq/affinity: Restrict managed IRQ affinity to housekeeping CPUs Aaron Tomlin
2026-03-30 22:10 ` [PATCH v9 13/13] docs: add io_queue flag to isolcpus Aaron Tomlin
2026-03-31 1:01 ` Ming Lei [this message]
2026-03-31 13:38 ` [PATCH v9 00/13] blk: honor isolcpus configuration Aaron Tomlin
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