Issue

• During snapshot/backup operation, RHEL 7.4 Guest VM in MS Hyper-V gets crashed with Out of Memory errors:

  journal: Hyper-V VSS: VSS: op=FREEZE: succeeded
  journal: Hyper-V VSS: VSS: op=THAW: succeeded
  [...]
  sd 4:0:1:1: [sdd] Sector size 0 reported, assuming 512.
  sd 3:0:1:0: [storvsc] Sense Key : Unit Attention [current] 
  sd 3:0:1:0: [storvsc] Add. Sense: Changed operating definition
  sd 3:0:1:0: Warning! Received an indication that the operating parameters on this target have changed. The Linux SCSI layer does not automa
  INFO: task kworker/u128:2:268 blocked for more than 120 seconds.
  "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  kworker/u128:2  D ffff88003666b868     0   268      2 0x00000000
  Workqueue: events_unbound async_run_entry_fn
  ffff880402663cc0 0000000000000046 ffff880403bf0000 ffff880402663fd8
  ffff880402663fd8 ffff880402663fd8 ffff880403bf0000 ffff88003666b860
  ffff88003666b864 ffff880403bf0000 00000000ffffffff ffff88003666b868
  Call Trace:
  [<ffffffff816aa409>] schedule_preempt_disabled+0x29/0x70
  [<ffffffff816a8337>] __mutex_lock_slowpath+0xc7/0x1d0
  [<ffffffff810ce8ad>] ? check_preempt_wakeup+0x11d/0x250
  [<ffffffff816a774f>] mutex_lock+0x1f/0x2f
  [<ffffffff81471d2e>] scsi_scan_host_selected+0x7e/0x1c0     <---
  [<ffffffff810c1309>] ? ttwu_do_wakeup+0x19/0xd0
  [<ffffffff81471f01>] do_scsi_scan_host+0x91/0xa0
  [<ffffffff814720fc>] do_scan_async+0x1c/0x160
  [<ffffffff810b7cc9>] async_run_entry_fn+0x39/0x120
  [<ffffffff810a881a>] process_one_work+0x17a/0x440
  [<ffffffff810a94e6>] worker_thread+0x126/0x3c0
  [<ffffffff810a93c0>] ? manage_workers.isra.24+0x2a0/0x2a0
  [<ffffffff810b098f>] kthread+0xcf/0xe0
  [<ffffffff810b08c0>] ? insert_kthread_work+0x40/0x40
  [<ffffffff816b4f58>] ret_from_fork+0x58/0x90
  [<ffffffff810b08c0>] ? insert_kthread_work+0x40/0x40
  [...]