Just in case, I also ran asyncio_gc.py 10x times on the master branch. I just replaced asyncio.async with asyncio.ensure_future. In short, I consider that the bug is now fixed.


I interrupted the test two times with CTRL+c. 9 runs were stopped correctly. 1 run failed with:

Fatal Python error: _enter_buffered_busy: could not acquire lock for <_io.BufferedWriter name='<stdout>'> at interpreter shutdown, possibly due to daemon threads

But this is a different issue, unrelated to "Modules/gcmodule.c:379: visit_decref: Assertion `((gc)->gc.gc_refs >> (1)) != 0' failed". It's just that the test uses print() in threads, whereas using print() during Python finalization is not reliable. Using os.write() or avoiding print() would avoid the issue.