Vitja Makarov, 09.05.2012 18:31:
> Del statement inference enabled pyregr.test_descr testcase and it SIGSEGVs.
> Here is minimal example:
>
> import unittest
> import sys
>
> class Foo(unittest.TestCase):
> def test_file_fault(self):
> # Testing sys.stdout is changed in getattr...
> test_stdout = sys.stdout
> class StdoutGuard:
> def __getattr__(self, attr):
> test_stdout.write('%d\n' % sys.getrefcount(self))
> sys.stdout = test_stdout #sys.__stdout__
> test_stdout.write('%d\n' % sys.getrefcount(self))
> test_stdout.write('getattr: %r\n' % attr)
> test_stdout.flush()
> raise RuntimeError("Premature access to sys.stdout.%s" % attr)
> sys.stdout = StdoutGuard()
> try:
> print "Oops!"
> except RuntimeError:
> pass
> finally:
> sys.stdout = test_stdout
>
> def test_getattr_hooks(self):
> pass
>
> from test import test_support
> test_support.run_unittest(Foo)
>
> It works in python and sigsegvs in cython.
> It seems to me that the problem is StdoutGuard() is still used when
> its reference counter is zero since Python interpreter does
> Py_XINCREF() for file object and __Pyx_Print() doesn't.
Makes sense to change that, IMHO. An additional INCREF during something as
involved as a print() will not hurt anyone.
IIRC, I had the same problem with PyPy - guess I should have fixed it back
then instead of taking the lazy escape towards using the print() function.
Stefan
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