RTEMS | fcntl(F_DUP2FD) onto a free descriptor yields a dead descriptor and leaves its iop on the free list (#5670)

[Sang Woo Kim (@physwkim)]

Sang Woo Kim commented: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5670#note_155853


One correction to the report: `F_DUP2FD` is defined only in the private `<rtems/libio_.h>`, not in any application-visible header, so applications reach this path through `dup2()` once #5669 is fixed rather than directly. The fix for both is up as !1381.

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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5670#note_155853
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