tee command hangs when receiving many outputs.

Solution Verified - Updated -


  • When standard output of telnet command is sent to tee command via pipe and many output occurs, tee command hangs with the message 'tee: standard output: Resource temporarily unavailable' outputted. This issue occurred at our customer's site.

  • How reproducible: It always occurs if many messages are outputted.

  • Steps to Reproduce:

    1. Run the following command and login.

      # telnet localhost | tee /tmp/tee.log
    2. Output a very large file with cat command.

      # cat /var/log/messages
  • Actual results: tee command hangs after 'tee: standard output: Resource temporarily unavailable' is outputted.
  • Expected results: It works without errors.

  • Additional information:

    • If ssh instead of telnet is specified then it does not occur.
    • It occurred in RHEL6, too.


  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • coreutils

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