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Hello. I had lecture about exception & frames on issue3515.
When Lib/subprocess.py (814)'s CreateProcess() raises exception,
p2cread will be freed by refcount GC, but it never happen before
os.remove() because sys.exc_traceback holds reference to frame
which has p2cread.
import subprocess, os
file = open("filename", "w")
try:
 proc = subprocess.Popen("nosuchprogram", stdout=file)
except OSError:
 pass
try:
 raise RuntimeError() # hack to clear previous exc_traceback
except:
 pass
file.close()
os.remove("filename") # runs fine
So, I think subprocess module's practice which relys on refcount GC
is not good. (p2cread is PC/_subprocess.c 's sp_handle_object, so
automatically freed by refcount GC) I don't think attached "adhok.patch"
is enough, but seems to fix this issue at least.