Sporadic failure in test_dump_tracebacks_later_file (test_faulthandler) #60175

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1. ezio-melotti commented on Sep 19, 2012

   

   ezio-melotti

   on Sep 19, 2012

   MemberAuthor

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   Seen on http://buildbot.python.org/all/builders/AMD64%20Lion%203.x/builds/428/steps/test/logs/stdio

   ======================================================================
   FAIL: test_dump_tracebacks_later_file (test.test_faulthandler.FaultHandlerTests)
   ----------------------------------------------------------------------

   Traceback (most recent call last):
     File "/Users/ambv/Buildbot/3.x.langa-lion/build/Lib/test/test_faulthandler.py", line 490, in test_dump_tracebacks_later_file
       self.check_dump_tracebacks_later(file=True)
     File "/Users/ambv/Buildbot/3.x.langa-lion/build/Lib/test/test_faulthandler.py", line 476, in check_dump_tracebacks_later
       filename, loops)
     File "/Users/ambv/Buildbot/3.x.langa-lion/build/Lib/test/test_faulthandler.py", line 460, in _check_dump_tracebacks_later
       self.assertRegex(trace, regex)
   AssertionError: Regex didn't match: '^Timeout \\(0:00:00.500000\\)!\\nThread 0x[0-9a-f]+:\\n  File "<string>", line 9 in func\n  File "<string>", line 20 in <module>$' not found in 'Timeout (0:00:00.500000)!\nThread 0x00007fff77d85960:\n  File "<string>", line 10 in func\n  File "<string>", line 20 in <module>'

   ---

   Ran 30 tests in 126.504s

   The regex expects the failure to be at "line 9 in func", but the failure happens at "line 10".
2. ezio-melotti

   assigned

   vstinner

   on Sep 19, 2012
3. ezio-melotti

   added

   testsTests in the Lib/test dirTests in the Lib/test dir

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   on Sep 19, 2012
4. vstinner commented on Sep 19, 2012

   

   vstinner

   on Sep 19, 2012

   Member

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   Code of the failing test:
   ----

   import faulthandler
   import time
   
   def func(timeout, repeat, cancel, file, loops):
       for loop in range(loops):
           faulthandler.dump_tracebacks_later(timeout, repeat=repeat, file=file)
           if cancel:
               faulthandler.cancel_dump_tracebacks_later()
           time.sleep(timeout * 5)  # line 9
           faulthandler.cancel_dump_tracebacks_later()   # line 10
   
   timeout = {timeout}
   repeat = {repeat}
   cancel = {cancel}
   loops = {loops}
   if {has_filename}:
       file = open({filename}, "wb")
   else:
       file = None
   func(timeout, repeat, cancel, file, loops)
   if file is not None:
       file.close()

   ---

   If the test fails at line 10: it means that it failed to dump the
   traceback in 2.5 seconds, whereas the traceback must be dumped after a
   timeout of 0.5 second.

   Do you know if the system load of this particular buildbot is high? It
   would be nice to have the system load in the output of the buildbot.

   We might change the timeout, but it is already long.
5. vstinner commented on Mar 25, 2014

   

   vstinner

   on Mar 25, 2014

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   I didn't see this error recently.
6. vstinner

   closed this as completedon Mar 25, 2014
7. ezio-melotti

   transferred this issue fromon Apr 10, 2022