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Mon Apr 16 21:57:31 CEST 2007 · https://mail.python.org/pipermail/python-dev/2007-April/072639.html

[Neal Norwitz]
> There were some SystemErrors on one of the Windows build slaves.

Not always, though -- looks to be rare.

> Does anyone have any ideas what might be the cause?  I looked through about
> 5 previous logs on the same slave and didn't see the same problem.

I'm home today and fired up my slave, and no problem there either.

> I haven't seen this myself and I don't know if it's WIndows specific.  I
> don't know if this has happened on the trunk or just 2.5.

Me neither.

> For the full log see:
>   http://python.org/dev/buildbot/2.5/x86%20XP%202.5/builds/197/step-test/0
>
> n
> --
>
> *** Previous context (I don't think this really matters):
>
> Re-running test 'test_profilehooks' in verbose mode
> test_caught_exception (test.test_profilehooks.ProfileHookTestCase) ... ok
> test_caught_nested_exception (test.test_profilehooks.ProfileHookTestCase) ... ok
> test_distant_exception (test.test_profilehooks.ProfileHookTestCase) ... ok
> test_exception (test.test_profilehooks.ProfileHookTestCase) ... ok
> test_exception_in_except_clause
> (test.test_profilehooks.ProfileHookTestCase) ... ok
> test_exception_propogation (test.test_profilehooks.ProfileHookTestCase) ... ok
> test_generator (test.test_profilehooks.ProfileHookTestCase) ... ok
> test_nested_exception (test.test_profilehooks.ProfileHookTestCase) ... ok
> test_raise (test.test_profilehooks.ProfileHookTestCase) ... ok
> test_raise_reraise (test.test_profilehooks.ProfileHookTestCase) ... ok
> test_raise_twice (test.test_profilehooks.ProfileHookTestCase) ... ok
> test_simple (test.test_profilehooks.ProfileHookTestCase) ... ok
> test_stop_iteration (test.test_profilehooks.ProfileHookTestCase) ... ok
> test_basic_exception (test.test_profilehooks.ProfileSimulatorTestCase) ... ok
> test_caught_exception (test.test_profilehooks.ProfileSimulatorTestCase) ... ok
> test_distant_exception (test.test_profilehooks.ProfileSimulatorTestCase) ... ok
> test_simple (test.test_profilehooks.ProfileSimulatorTestCase) ... ok
>
> ----------------------------------------------------------------------
> Ran 17 tests in 0.016s
>
> OK
>
> *** Here is the problem:
>
> Exception exceptions.SystemError: 'error return without exception set' in <generator object at 0x00CCCDF8> ignored
> Exception exceptions.SystemError: 'error return without exception set' in <generator object at 0x010891F8> ignored
> Exception exceptions.SystemError: 'error return without exception set' in <generator object at 0x01089578> ignored
> Exception exceptions.SystemError: 'error return without exception set' in <generator object at 0x01089838> ignored
> Exception exceptions.SystemError: 'error return without exception set' in <generator object at 0x00D3BFB8> ignored

> *** The following messages occur in other successful tests too:
>     a DOS box should flash briefly ...

Always happens in test_subprocess, during the Windows-specific
test_creationflags.  This is expected.  When you /watch/ the tests
running on Windows, it's intended to prevent panic when a mysterious
DOS box appears ;-)

>         find_library('c') ->  None
>         find_library('m') ->  None

Mysterious.  Looks like debug/trace(!) output while running
Lib/ctypes/test/test_loading.py's test_find().

> C:\buildbot_py25\2.5.mcintyre-windows\build\lib\test\test_unicode_file.py:103:
> UnicodeWarning: Unicode equal comparison failed to convert both
> arguments to Unicode - interpreting them as being unequal
>   filename1==filename2
> C:\buildbot_py25\2.5.mcintyre-windows\build\lib\shutil.py:36:
> UnicodeWarning: Unicode equal comparison failed to convert both
> arguments to Unicode - interpreting them as being unequal
>   os.path.normcase(os.path.abspath(dst)))

Those started showing up months ago.

> warning: DBTxn aborted in destructor.  No prior commit() or abort().

Likewise, from the bsddb test, and we've been seeing this one on
Unixish boxes too.

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[Python-Dev] SystemErrors in generator (just happened in 2.5)