[Python-Dev] faulthandler is now part of Python 3.3

Tres Seaver tseaver at palladion.com
Thu Mar 31 14:47:52 CEST 2011

Hash: SHA1

On 03/30/2011 09:54 PM, Victor Stinner wrote:
> Hi,
> I pushed my faulthandler module into the default branch (Python 3.3).
> Since one week, I fixed a lot of bugs (platform issues), improved the
> tests and Antoine wrote a new implementation of dump_backtraces_later()
> using a thread (instead of SIGALRM+alarm()). It should now work on all
> platforms (but register() is not available on Windows).
> Use "python -X faulthandler" or "PYTHONFAULTHANDLER=1 python" to install
> the fault handler at startup (catch segfaults and other fatal errors).
> You can also register a signal (e.g. SIGUSR1) to dump the traceback on
> this signal.
> The latest added feature is to be able to the dump the traceback after a
> timeout and exit the process: we may use it on regrtest.py to learn more
> about test_multiprocess and test_threadsignals hangs. Issue #11393 has a
> patch implementing this issue: add --timeout option to regrtest.py. You
> can also just dump the traceback after the timeout without exiting.
> Py_FatalError() always print the Python traceback (except if an
> exception was raised: print the exception with its traceback).
> For more information, read the doc:
> http://docs.python.org/dev/library/faulthandler.html
> Please tell me if you have any issue related to faulthandler.
> --
> If you get "undefined reference to `_PyFaulthandler_Init'" compiler
> error, copy Modules/Setup.dist to Modules/Setup (cp Modules/Setup.dist
> Modules/Setup).
> test_faulthandler hangs on AMD64 Gentoo Wide 3.x and AMD64 OpenIndiana
> 3.x. It looks to be related to the stack overflow test (the stack is
> maybe not limited on these buildbots?). I have a patch, but I cannot
> test it because these buildbots are dead (oops, sorry!).
> Most buildbots are red because a regression in test_logging (since 2
> days): I disabled temporary the test (issue #11557), I hope that the
> situation will be better in a few hours.
> Thank you Antoine for your reviews!

Thanks very much for you hard work on this cool new feature.

- -- 
Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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