rsync: failed verification -- update discarded. No data available (61)

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Table of Contents
  1. Error
  2. Causes
    1. pseudo file systems

Error

Sample error:

config/sdcardfs/com.google.android.gms/excluded_userids
ERROR: config/sdcardfs/com.google.android.gms/excluded_userids failed verification -- update discarded.
rsync: read errors mapping "/config/sdcardfs/com.google.android.gms/excluded_userids": No data available (61

Causes

pseudo file systems

See the content of /proc/filesystems. It includes a list of filesystems. Those with nodev in front are pseudo filesystems. They do not require a block device