Allan Hessenflow commented: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5411#note_138967


On further reflection the possible fix above is certainly incorrect. A better 
fix would be to replace the test !rtems_ibio_iop_is_free() inside 
rtems_libio_free_iop() with an atomic test and set of LIBIO_FLAGS_FREE prior to 
the rtems_libio_lock(). I don't know about spintrcritical24.

-- 
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https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5411#note_138967
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