rngd: too many FIPS failures, disabling entropy source

Solution Verified - Updated -

Issue

  • A tpm module for random number generation is being used and rngd stops occasionally
  • rngd fails with errors:
Sep 4 19:37:20 host2 rngd: failed fips test  
Sep 5 08:35:36 host2 rngd: failed fips test  
Sep 5 17:01:37 host2 rngd: failed fips test  
Sep 6 17:00:45 host2 rngd: failed fips test  
Sep 6 17:00:45 host2 rngd: too many FIPS failures, disabling entropy source  
Sep 6 17:00:45 host2 rngd: No entropy sources working, exiting rngd

rngd dead but subsys locked

Environment

  • Red Hat Enterprise Linux 5
    • 'rng-utils' prior to version 'rng-utils-2.0-5.el5'
  • Red Hat Enterprise Linux 6, 7
    • rng-tools

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