Alexey Izbyshev <izbys...@ispras.ru> added the comment:

ktrace shows that dup(0) succeeded but fstat(0) failed. The symptom is the same 
as in #30225. Could you check whether any of the following quick tests produces 
the same error?

python3 -c 'import os, subprocess, sys; r, w = os.pipe(); os.close(w); 
subprocess.call([sys.executable, "-c", ""], stdin=r)'

python3 -c 'import os, subprocess, sys; r, w = os.pipe(); os.close(r); 
subprocess.call([sys.executable, "-c", ""], stdin=w)'

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nosy: +izbyshev, vstinner

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32849>
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