BUG: workqueue lockup - pool cpus=2 node=1 flags=0x0 nice=0 stuck for 48s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 4: cpus=2 node=1 flags=0x0 nice=0 active=2/256
    pending: cache_reap, e1000_watchdog
workqueue mm_percpu_wq: flags=0x8
  pwq 4: cpus=2 node=1 flags=0x0 nice=0 active=1/256
    pending: vmstat_update
workqueue ipv6_addrconf: flags=0x40008
  pwq 4: cpus=2 node=1 flags=0x0 nice=0 active=1/1
    pending: addrconf_dad_work