Why do I get I/O errors when my LVM snapshot reaches 100% usage?

Issue

• LVM Snapshot has become invalid with I listed under the Attr column of lvs:

# lvs
  LV                    VG   Attr    LSize   Origin  Data%
  LogVol00      VolGroup01 owi-ao    7.33T
  LogVol00_snap VolGroup01 Swi-Io  877.00G LogVol00 100.00

• LVM Snapshot is reporting IO errors:

/dev/VolGroup01/LogVol00_snap: read failed after 0 of 4096 at 0: Input/output error

• LVM is reporting a state change in the logs:

lvm[13911]: Snapshot Volgroup01-LogVol00_snap changed state to: Invalid

• LVM snapshot was created, when trying to merge it lvconvert --merge, it fails with unable to merge - invalidated snapshot. How to merge the snapshot and recover from this situation?
• Unable to run LVM commands, When tries to run any LVM command, it shows I/O error message and goes to hung state. Here are the command outputs, Need to break every time using Ctrl+c:

 # vgs
  /dev/VolGroup01/LogVol00_snap: read failed after 0 of 4096 at 52613283840: Input/output error
  /dev/VolGroup01/LogVol00_snap: read failed after 0 of 4096 at 52613341184: Input/output error
  /dev/VolGroup01/LogVol00_snap: read failed after 0 of 4096 at 0: Input/output error
  /dev/VolGroup01/LogVol00_snap: read failed after 0 of 4096 at 4096: Input/output error
^C  CTRL-c detected: giving up waiting for lock
  /var/lock/lvm/V_VolGroup01: flock failed: Interrupted system call
  Can't get lock for VolGroup01