cpio command returns warning message - 'file shrunk by n bytes, padding with zeros'

Solution Verified - Updated -

Issue

  • While taking the system backup using cpio command following warning messages are observed.
cpio: File ./sys/devices/system/cpu/cpu0/cache/index2/coherency_line_size shrunk by 4093 bytes, padding with zeros
cpio: File ./sys/devices/system/cpu/cpu0/cache/index2/level shrunk by 4094 bytes, padding with zeros
[...]
cpio: ./sys/devices/platform/serial8250/tty:ttyS2: Invalid argument
  • Whether above messages are informational only? or it indicates some problem?

Environment

  • Red Hat Enterprise Linux 6

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