bufdaemon and bufspacedaemon kernel threads use kthread_shutdown() to stop activity on system shutdown. The problem is that kthread_shutdown() has no idea about the wait channel and lock used by specific thread to wake them up reliably. As result, up to 9 threads could consume up to 9 seconds to shutdown for no good reason.
bufdaemon and bufspacedaemon kernel threads use kthread_shutdown() to stop activity on system shutdown. The problem is that kthread_shutdown() has no idea about the wait channel and lock used by specific thread to wake them up reliably. As result, up to 9 threads could consume up to 9 seconds to shutdown for no good reason.