New submission from Richard Purdie <richard.pur...@linuxfoundation.org>:
We've seen tracebacks in production like: File "<frozen importlib._bootstrap>", line 1004, in _find_and_load(name='oe.gpg_sign', import_=<built-in function __import__>) File "<frozen importlib._bootstrap>", line 158, in _ModuleLockManager.__enter__() File "<frozen importlib._bootstrap>", line 110, in _ModuleLock.acquire() KeyError: 139622474778432 and File "<frozen importlib._bootstrap>", line 1004, in _find_and_load(name='oe.path', import_=<built-in function __import__>) File "<frozen importlib._bootstrap>", line 158, in _ModuleLockManager.__enter__() File "<frozen importlib._bootstrap>", line 110, in _ModuleLock.acquire() KeyError: 140438942700992 I've attached a reproduction script which shows that if an import XXX is in progress and waiting at the wrong point when an interrupt arrives (in this case a signal) and triggers it's own import YYY, _blocking_on[tid] in importlib/_bootstrap.py gets overwritten and lost, triggering the traceback we see above upon exit from the second import. I'm using a signal handler here as the interrupt, I don't know what our production source is as yet but this reproducer proves it is possible. ---------- components: Interpreter Core files: testit2.py messages: 416517 nosy: rpurdie priority: normal severity: normal status: open title: importlib lock race issue in deadlock handling code versions: Python 3.10 Added file: https://bugs.python.org/file50714/testit2.py _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue47195> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
