BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 252s! BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=-20 stuck for 250s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=3/256 pending: dst_gc_task, linkwatch_event, vmstat_shepherd workqueue kblockd: flags=0x18 pwq 3: cpus=1 node=0 flags=0x0 nice=-20 active=2/256 pending: blk_timeout_work, cfq_kick_queue workqueue vmstat: flags=0xc pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 pending: vmstat_update workqueue ipv6_addrconf: flags=0x40008 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1 pending: addrconf_dad_work