BUG: workqueue lockup - pool cpus=2 node=1 flags=0x0 nice=0 stuck for 42s!
Showing busy workqueues and worker pools:
workqueue mm_percpu_wq: flags=0x8
  pwq 4: cpus=2 node=1 flags=0x0 nice=0 active=1/256
    pending: vmstat_update