QA output created by 125

Write data with degraded mount

Mount normal and balance
ERROR: error during balancing '/mnt/scratch': Input/output error
There may be more info in syslog - try dmesg | tail
md5sum: /mnt/scratch/tf2: Input/output error

Mount degraded but with other dev
failed: '/usr/local/bin/btrfs filesystem df /mnt/scratch'
(see /xfstests-dev/results//btrfs_compress_noholes/btrfs/125.full for details)