Debugging SocketServer.ThreadingTCPServer

Jean-Paul Calderone exarkun at
Tue Jan 16 15:11:38 CET 2007

On Tue, 16 Jan 2007 00:23:35 -0500, "Stuart D. Gathman" <stuart at> wrote:
>I have a ThreadingTCPServer application (pygossip, part of
>  It mostly runs well, but
>occasionally goes into a loop.  How can I get a stack trace of running
>threads to figure out where the loop is?  Is there some equivalent of
>sending SIGQUIT to Java to get a thread dump?  If needed, I can import pdb
>and set options at startup, but there needs to be some external way of
>triggering the dump since I can't reproduce it at will.

Grab the gdbinit out of Python SVN Misc/ directory.  Apply this patch:

Attach to the process using gdb.  Make sure you have debugging symbols
in your build of Python.  Run 'thread apply all pystack'.


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