Re: [RFC PATCH 1/8] workqueue: Unconditionally set cpumask in worker_attach_to_pool()

[Peter Zijlstra]

On Thu, Aug 04, 2022 at 04:41:28PM +0800, Lai Jiangshan wrote:
> From: Lai Jiangshan <jiangshan.ljs@xxxxxxxxxxxx>
> 
> If a worker is spuriously woken up after kthread_bind_mask() but before
> worker_attach_to_pool(), and there are some cpu-hot-[un]plug happening
> during the same interval, the worker task might be pushed away from its
> bound CPU with its affinity changed by the scheduler and worker_attach_to_pool()
> doesn't rebind it properly.

Can you *please* be more explicit. The above doesn't give me enough clue
to reconstruct the actual scenario you're fixing.

Draw a picture or something.