Starting pvmove on physical volumes created on top of MD devices causes IO error on ongoing IO.

Issue

• Starting pvmove on physical volumes created on top of MD devices causes IO error on ongoing IO.

# pvmove /dev/md0 /dev/md1 
  /dev/md0: Moved: 0.08%

# dd if=/dev/zero of=/data/test.out bs=512K oflag=direct status=progress 
2085093376 bytes (2.1 GB) copied, 2.006912 s, 1.0 GB/s
dd: error writing ‘/data/test.out’: Input/output error   <=====
4944+0 records in
4943+0 records out
2591555584 bytes (2.6 GB) copied, 2.55409 s, 1.0 GB/s