sem_timedwait() called from 32 bit shared library does not wake (blocks forever) in RHEL7

Solution Verified - Updated -


  • Executable and shared library(ies) linked to different versions of a symbol.
  • Underlinked object linked to unversioned symbol(s).
  • Properly linked object linked to the correct (versioned) symbols.
  • Normally the problem happens with libpthread symbols, but might also happen with librt symbols.
  • Commonly happen with a dlopen()'end library.


  • Red Hat Enterprise Linux (RHEL) 7.3 or newer
  • glibc-2.17-149.el7.i686 or newer

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