[issue6435] logging: cache the traceback text on formatter, instead of record

[Sridhar Ratnakumar]

Sridhar Ratnakumar <sridharr at activestate.com> added the comment:

A real-life recipe where this bug showed up: 

  http://code.activestate.com/recipes/576836/

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6435>
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