Comment # 2 on bug 1185520 from
FWIW: the false positive was not really related to 1 or more CPUs,
but because ls(1) now calls stat(STDOUT_FILENO, ...) before writing to stdout,
and the ls invocation to create the reference count didn't output anything;
hence the difference to the expected outcome.

Discussed at:
  https://lists.gnu.org/r/coreutils/2021-04/msg00050.html
Upstream patch:
  https://git.sv.gnu.org/cgit/coreutils.git/commit/?id=b7091093bb


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