[Patches] [ python-Patches-954922 ] Fix for 754449: hiding exc in threading during interp shutdn

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Patches item #954922, was opened at 2004-05-16 11:43
Message generated for change (Settings changed) made by bcannon
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https://sourceforge.net/tracker/?func=detail&atid=305470&aid=954922&group_id=5470

Category: Library (Lib)
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Brett Cannon (bcannon)
Assigned to: Nobody/Anonymous (nobody)
>Summary: Fix for 754449: hiding exc in threading during interp shutdn

Initial Comment:
Decided to start a fresh tracker item for this patch since I already 
attempted to close bug 754449 once before and I want to make 
sure the two fixes stay separate.

Someone emailed me a program whose testing suite could reliably 
reproduce the problem as reported in the bug report (for a quck 
refresher, basically if someone leaves a threading.Thread instance 
running while the interpreter is being shutdown and an exception is 
raised in the thread then that exception will cause  *another* 
exception in the subsequent attempt to report the exception from 
the thread because all globals have been set to None at that point).  
The previous fix that I checked in turned out not to be thorough 
enough (still needed, though).  I am currently waiting for the 
person who emailed me the triggering code to let me know if I can 
publish how to cause the error.

Attached is a patch to remove all instances of accessing globals 
(just as if I was writing a __del__ method for threading.Thread) by 
storing copies of sys.stderr, sys.exc_info, and sys.tracebacklimit.  
All of this is so that a decent approximation of a traceback print-
out can occur without having to call the 'traceback' module since its 
functions depend a lot on each other.

I mainly need someone else who is more familiar with dealing with 
tracebacks to make sure that I have not done something stupid and 
to make sure this is the best way to handle things.

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Comment By: Brett Cannon (bcannon)
Date: 2004-05-16 21:37

Message:
Logged In: YES 
user_id=357491

Just posted how to reproduce the bug using the in-dev version of mnet as 
a post to the bug tracker item.

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