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comparison contrib/showstack.py @ 40036:acf5dbe39478

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showstack: also handle SIGALRM This is looking *very* handy when debugging mysterious hangs in a test: you can wrap a hanging invocation in `perl -e 'alarm shift @ARGV; exec @ARGV' 1` for example, a hanging `hg pull` becomes `perl -e 'alarm shift @ARGV; exec @ARGV' 1 hg pull` where the `1` is the timeout in seconds before the process will be hit with SIGALRM. After making that edit to the test file, you can then use --extra-config-opt on run-tests.py to globaly enable showstack during the test run, so you'll get full stack traces as you force your hg to exit. I wonder (but only a little, not enough to take action just yet) if we should wire up some scaffolding in run-tests itself to automatically wrap all commands in alarm(3) somehow to avoid hangs in the future? Differential Revision: https://phab.mercurial-scm.org/D4870
author Augie Fackler <augie@google.com>
date Wed, 03 Oct 2018 16:03:16 -0400
parents c9eb92fb87b7
children 6dae1f31c6c9
comparison
equal deleted inserted replaced
40035:7a347d362a45 40036:acf5dbe39478
2 # 2 #
3 # binds to both SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs) 3 # binds to both SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)
4 """dump stack trace when receiving SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs) 4 """dump stack trace when receiving SIGQUIT (Ctrl-\) and SIGINFO (Ctrl-T on BSDs)
5 """ 5 """
6 6
7 from __future__ import absolute_import 7 from __future__ import absolute_import, print_function
8 import signal 8 import signal
9 import sys 9 import sys
10 import traceback 10 import traceback
11 11
12 def sigshow(*args): 12 def sigshow(*args):
13 sys.stderr.write("\n") 13 sys.stderr.write("\n")
14 traceback.print_stack(args[1], limit=10, file=sys.stderr) 14 traceback.print_stack(args[1], limit=10, file=sys.stderr)
15 sys.stderr.write("----\n") 15 sys.stderr.write("----\n")
16 16
17 def sigexit(*args):
18 sigshow(*args)
19 print('alarm!')
20 sys.exit(1)
21
17 def extsetup(ui): 22 def extsetup(ui):
18 signal.signal(signal.SIGQUIT, sigshow) 23 signal.signal(signal.SIGQUIT, sigshow)
24 signal.signal(signal.SIGALRM, sigexit)
19 try: 25 try:
20 signal.signal(signal.SIGINFO, sigshow) 26 signal.signal(signal.SIGINFO, sigshow)
21 except AttributeError: 27 except AttributeError:
22 pass 28 pass