[issue12550] regrtest: register SIGALRM signal using faulthandler

[STINNER Victor]

New submission from STINNER Victor <victor.stinner at haypocalc.com>:

Sometimes, some tests are stopped because of SIGALRM. A recent example:
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[157/357] test_socketserver
Alarm clock
*** Error code 142
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http://www.python.org/dev/buildbot/all/builders/x86%20FreeBSD%206.4%203.x/builds/1647/steps/test/logs/stdio

faulthandler is able to dump the Python backtrace in such case, we just have to register the SIGALRM signal handler. regrtest should be patched: just add faulthandler.register(signal.SIGALRM).

It would be nice if faulthandler calls the previous signal handler. By default, it replaces the existing signal handler and so it changes the behaviour.

A test should also be added to faulthandler for SIGALRM, this signal is special because of its default signal handler (it exits the process).

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components: Tests
messages: 140243
nosy: haypo
priority: normal
severity: normal
status: open
title: regrtest: register SIGALRM signal using faulthandler
type: crash
versions: Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12550>
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