Infinite loop in ExceptionReporter.get_traceback_frames()

[James Howe]

The following code generates a cause/context cycle (exc_value.__cause__.__context__ is exc_value):

except WrapperException as exc:
    raise exc.__cause__

The ​while exc_value loop then never terminates.

[James Howe]

A possible workaround would be available if PEP 415 (__suppress_context__) were respected.

[Tim Graham]

Can you please give code to reproduce the issue?

[James Howe]

In a view, with DEBUG = True.

try:
    raise RuntimeError('outer') from RuntimeError('inner')
except RuntimeError as exc:
    raise exc.__cause__

[Tim Graham]

​PR

[Tim Graham <timograham@…>]

In 3634560f:

Fixed #29393 -- Prevented infinite loop in ExceptionReporter.get_traceback_frames().

[Chris Jerdonek]

I filed #31675, which is an enhancement related to this issue.