BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 35s! BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=-20 stuck for 30s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=3/256 pending: perf_sched_delayed, vmstat_shepherd, cache_reap workqueue events_power_efficient: flags=0x80 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256 pending: gc_worker, neigh_periodic_work workqueue mm_percpu_wq: flags=0x8 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 pending: vmstat_update workqueue kblockd: flags=0x18 pwq 3: cpus=1 node=0 flags=0x0 nice=-20 active=1/256 pending: blk_timeout_work pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=1/256 pending: cfq_kick_queue