On Thu, Jul 23, 2020 at 09:30:57AM -0700, Sagi Grimberg wrote: > + /* all namespaces share hctxs, so sync just once */ > + blk_mq_quiesce_queue_sync(ns->queue); They don't share hctx's. An hctx is a property of a specific request_queue, and each namespace has their own.