[New-bugs-announce] [issue22164] cell object cleared too early?

Antoine Pitrou report at bugs.python.org
Thu Aug 7 16:32:39 CEST 2014

New submission from Antoine Pitrou:

This is a tricky issue I'm sometimes seeing when running Numba's test suite, and I can't seem to write a reproducer. Somtimes I'm seeing the following messages:

Exception ignored in: <function _OverloadedBase._make_finalizer.<locals>.finalizer at 0x7f1466487c80>
Traceback (most recent call last):
  File "/home/antoine/numba/numba/dispatcher.py", line 59, in finalizer
    if shutting_down():
NameError: free variable 'shutting_down' referenced before assignment in enclosing scope

So what does it correspond to? The code is here:

Basically, there's no way 'shutting_down' can be referenced before assignment... except if it has been cleared. And the only thing which can clear it here is the GC (namely, cell objects' tp_clear() method).

I'm not sure what the exact trigger for reproduction is. It does have to feature a reference cycle involving the closure; perhaps the trashcan mechanism comes into play as well. Also, the closure must be invoked on collection of something in the cycle, so a weakref callback could be nice.

messages: 225012
nosy: pitrou, tim.peters
priority: normal
severity: normal
status: open
title: cell object cleared too early?
versions: Python 3.4, Python 3.5

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