[5.4] /proc/<PID>/wchan shows an invalid value

Solution Verified - Updated -

Issue

  • [5.4] /proc/<PID>/wchan shows an invalid value.
  • /proc/<PID>/wchan file on x86_64 or x86 systems sometimes shows an invalid value that is not either a function name or a function address.

Environment

  • Red Hat Enterprise Linux 5 Update 4
  • x86_64, x86
  • 2.6.18-164.el5

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