Bugs item #1686386, was opened at 2007-03-22 17:00 Message generated for change (Settings changed) made by rhettinger You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1686386&group_id=5470
Please note that this message will contain a full copy of the comment thread, including the initial issue submission, for this request, not just the latest update. Category: Python Interpreter Core Group: Python 2.5 Status: Open Resolution: None >Priority: 7 Private: No Submitted By: toxik (ludvig.ericson) Assigned to: Nobody/Anonymous (nobody) Summary: Python SEGFAULT on invalid superclass access Initial Comment: When one uses a class that has derived BaseException in one way or another and uses an invalid super() and calls a function upon that object, Python dies with SIGSEGV. Reproduce code: >>> class X(BaseException): ... def __init__(self): ... super(X, self).__init__(self) ... >>> X() Segmentation fault I could reproduce this on two different Python 2.5 installations. This is as much as I could get from gdb: Program received signal SIGSEGV, Segmentation fault. [Switching to Thread -1211660624 (LWP 30234)] 0xb7ea601c in _PyObject_GC_Malloc () from /usr/lib/libpython2.5.so.1.0 (gdb) bt #0 0xb7ea601c in _PyObject_GC_Malloc () from /usr/lib/libpython2.5.so.1.0 #1 0xb7ea613b in _PyObject_GC_NewVar () from /usr/lib/libpython2.5.so.1.0 #2 0xb7e4abe4 in PyTuple_New () from /usr/lib/libpython2.5.so.1.0 #3 0xb7e4b48d in ?? () from /usr/lib/libpython2.5.so.1.0 #4 0x00000001 in ?? () #5 0x00000000 in ?? () ---------------------------------------------------------------------- Comment By: Georg Brandl (gbrandl) Date: 2007-03-22 17:37 Message: Logged In: YES user_id=849994 Originator: NO This is not new in 2.5. That is does not work with super() in 2.4 is because in 2.4 exceptions are old-style classes. Look at this: >>> class X(Exception): ... def __init__(self): ... Exception.__init__(self, self) ... >>> x=X() >>> str(x) [1] 4396 segmentation fault python2.4 The problem is that str(x) calls str(x) etc. ---------------------------------------------------------------------- Comment By: toxik (ludvig.ericson) Date: 2007-03-22 17:09 Message: Logged In: YES user_id=1373326 Originator: YES It might be added that this works (throws an exception) in python 2.4 (though, BaseException does not exist there): TypeError: super() argument 1 must be type, not classobj ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1686386&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
