On 2025-08-26 07:03:33 [-0700], Sean Christopherson wrote: > And the call from __vhost_worker_flush() is done while holding a vhost_worker.mutex. > That's probably ok? But there are many paths that lead to __vhost_worker_flush(), > which makes it difficult to audit all flows. So even if there is an easy change > for the RCU conflict, I wouldn't be comfortable adding a mutex_lock() to so many > flows in a patch that needs to go to stable@. If I may throw something else into the mix: If you do "early" get_task_struct() on the thread (within the thread), then you could wake it even after its do_exit() since the task_struct would remain valid. Once you remove it from all structs where it can be found, you would do the final put_task_struct(). Sebastian
