STINNER Victor added the comment:
Using attached importlib_sleep.patch, you can *see* the race condition with:
diff --git a/Lib/test/test_import/data/package/__init__.py
b/Lib/test/test_import/data/package/__init__.py
index a4f2bc3..f07eb11 100644
--- a/Lib/test/test_import/data/package/__init__.py
+++ b/Lib/test/test_import/data/package/__init__.py
@@ -1,2 +1,3 @@
import package.submodule
+print("package: id=%#x" % id(package))
package.submodule
Example of output:
---
haypo@selma$ ./python -m test -m test_concurrency -v test_import
package: id=0x7fb497400d58
package: id=0x7fb49744d458
test test_import failed -- (...)
---
Lib/test/test_import/data/package/__init__.py is run twice instead of being run
once. A lock is missing somewhere on the package module.
----------
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30891>
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