BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 189s! BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=-20 stuck for 188s! BUG: workqueue lockup - pool cpus=0-1 flags=0x4 nice=0 stuck for 185s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 pending: vmstat_shepherd workqueue events_power_efficient: flags=0x80 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 pending: check_lifetime workqueue writeback: flags=0x4e pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 pending: wb_workfn workqueue kblockd: flags=0x18 pwq 3: cpus=1 node=0 flags=0x0 nice=-20 active=3/256 pending: cfq_kick_queue, blk_timeout_work, blk_delay_work workqueue vmstat: flags=0xc pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 pending: vmstat_update