Loris Nardo commented on a discussion on cpukit/libcsupport/src/open.c: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/178#note_110819

 >    rv = (*iop->pathinfo.handlers->open_h)( iop, path, oflag, mode );
 >  
 >    if ( rv == 0 ) {
 > -    rtems_libio_iop_flags_set( iop, LIBIO_FLAGS_OPEN );
 > -
 > +    /*
 > +     * Postpone the setting of LIBIO_FLAGS_OPEN after the truncation of the
 > +     * file, this ensures that the file descriptor cannot be used or closed
 > +     * during or just before the truncation by some other thread.
 > +    */

This should be fixed now

-- 
View it on GitLab: 
https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/178#note_110819
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