STINNER Victor added the comment:
I can reproduce the bug with gdb if the file descriptor 0 is closed before
calling:
std = create_stdio(iomod, fd, 0, "<stdin>", encoding, errors);
and after the following lines were called:
fd = fileno(stdin);
if (!is_valid_fd(fd)) {
In initstdio () at Python/pylifecycle.c:1156.
create_stdio() fails in FileIO constructor, on the line:
if (_Py_fstat(self->fd, &fdfstat) < 0)
of _io_FileIO___init___impl() at Modules/_io/fileio.c:480
It's a corner case of the issue #7111, I would call it a race condition.
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<http://bugs.python.org/issue24891>
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