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<a href="https://gitlab.rtems.org/allanhessenflow">Allan Hessenflow</a>
<a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5411#note_139115">commented</a>:
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">With additional testing I can now explain the spintrcritical24 failures I've seen and the patch above that adds the atomic test and set of LIBIO_FLAGS_FREE in rtems_libio_free_iop outside the semaphore protected section is a correct fix for that as well as for newlib01.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">In spintrcritical24 fcntl() is called from inside an interrupt on a file descriptor that is being closed from a normal task at approximately the same time. The close() results in rtems_libio_free_iop() being called. If the interrupt occurs inside that function after the test for LIBIO_FLAGS_FREE and before that flag is set then the free occurs twice on the same descriptor, messing up the free list. If the function that takes the mutex returns some error when called from an interrupt context, checking for that and not proceeding would also work to handle this case but not the newlib01() case.</p>
<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">The newlib01() test is similar in that it causes rtems_libio_free_iop() to be called at a point in the exit() process when semaphores can no longer be taken.</p>
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