Message225012
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:
https://github.com/numba/numba/blob/master/numba/dispatcher.py#L47
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. |
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Date |
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Action |
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2014-08-07 14:32:39 | pitrou | set | recipients:
+ pitrou, tim.peters |
2014-08-07 14:32:39 | pitrou | set | messageid: <1407421959.83.0.174061439532.issue22164@psf.upfronthosting.co.za> |
2014-08-07 14:32:39 | pitrou | link | issue22164 messages |
2014-08-07 14:32:39 | pitrou | create | |
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