New submission from Pierre Ossman <[email protected]>:
These three things do not mix:
- AttributeError
- Threads
- Object methods
An unhandled AttributeError thrown in a thread will not call sys.excepthook if
the thread's start function is a class/object method.
Test case:
import sys
import thread
class Dummy:
def worker(self):
raise AttributeError
thread.start_new_thread(Dummy().worker, ())
sys.stdin.readline()
Note that you do not get a traceback here. Throwing any other exception type
works fine, as does having worker() be a simple function.
I think I've traced the issue to Objects/classobject.c:instance_repr(). It
tries to look up the method, making sure to handle any AttributeError this
might cause. But it fails to save and restore and Exception currently already
active, effectively clearing out the current exception.
----------
components: Interpreter Core
messages: 157350
nosy: ossman
priority: normal
severity: normal
status: open
title: mishandling of AttributeError in threads
versions: Python 2.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue14474>
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