Confirmed in py3k (debug), trunk (non-debug) hangs with lots of CPU
activity.

py3k backtrace:
#0  0x0805c196 in do_richcompare (v=0x83e734c, w=0xb7afa648, op=2) at
Objects/object.c:561
#1  0x0805c450 in PyObject_RichCompare (v=0x83e734c, w=0xb7afa648, op=2)
at Objects/object.c:611
#2  0x0805c4f8 in PyObject_RichCompareBool (v=0x83e734c, w=0xb7afa648,
op=2) at Objects/object.c:633
#3  0x080b4140 in PyEval_EvalCodeEx (co=0x836b748, globals=0xb7d4e8f4,
locals=0x0, args=0xb7d14048, argcount=0,
    kws=0xb7ac1c08, kwcount=2, defs=0x0, defcount=0, kwdefs=0x0,
closure=0x0) at Python/ceval.c:3019
#4  0x08168f6c in function_call (func=0x839fa84, arg=0xb7d14034,
kw=0x82998f4) at Objects/funcobject.c:628
#5  0x08136e66 in PyObject_Call (func=0x839fa84, arg=0xb7d14034,
kw=0x82998f4) at Objects/abstract.c:2161
#6  0x080b74d5 in ext_do_call (func=0x839fa84, pp_stack=0xbfe58674,
flags=2, na=0, nk=0) at Python/ceval.c:4045
#7  0x080b1ae7 in PyEval_EvalFrameEx (f=0x828b57c, throwflag=0) at
Python/ceval.c:2571
#8  0x080b49fe in PyEval_EvalCodeEx (co=0x8370da8, globals=0xb7d4e8f4,
locals=0xb7d4e8f4, args=0x0, argcount=0, kws=0x0,
    kwcount=0, defs=0x0, defcount=0, kwdefs=0x0, closure=0x0) at
Python/ceval.c:3180
#9  0x080a901d in PyEval_EvalCode (co=0x8370da8, globals=0xb7d4e8f4,
locals=0xb7d4e8f4) at Python/ceval.c:650
#10 0x080e269c in run_mod (mod=0x84112f0, filename=0x81bef10 "<stdin>",
globals=0xb7d4e8f4, locals=0xb7d4e8f4,
    flags=0xbfe58ab8, arena=0x8348338) at Python/pythonrun.c:1697
#11 0x080e08d7 in PyRun_InteractiveOneFlags (fp=0xb7e9e440,
filename=0x81bef10 "<stdin>", flags=0xbfe58ab8)
    at Python/pythonrun.c:1091
#12 0x080e03dc in PyRun_InteractiveLoopFlags (fp=0xb7e9e440,
filename=0x81bef10 "<stdin>", flags=0xbfe58ab8)
    at Python/pythonrun.c:993
#13 0x080e0234 in PyRun_AnyFileExFlags (fp=0xb7e9e440,
filename=0x81bef10 "<stdin>", closeit=0, flags=0xbfe58ab8)
    at Python/pythonrun.c:962
#14 0x080f7fc4 in Py_Main (argc=1, argv=0xb7d12028) at Modules/main.c:625
#15 0x0805b22e in main (argc=1, argv=0xbfe59be4) at ./Modules/python.c:71

trunk backtrace:
Program received signal SIGINT, Interrupt.
[Switching to Thread 0xb7da68c0 (LWP 22330)]
0x080ff6a8 in PyTraceBack_Print (v=0xb7bf1e3c, f=0xb7d780c0) at
Python/traceback.c:243
243             while (tb1 != NULL) {
(gdb) bt
#0  0x080ff6a8 in PyTraceBack_Print (v=0xb7bf1e3c, f=0xb7d780c0) at
Python/traceback.c:243
#1  0x080f6f56 in PyErr_Display (exception=0x816a540, value=0xb7bf504c,
tb=0xb7bf1e3c) at Python/pythonrun.c:1200
#2  0x080fd7ed in sys_excepthook (self=0x0, args=0xb7bf1d4c) at
Python/sysmodule.c:138
#3  0x0805e8e5 in PyObject_Call (func=0xb7d7728c, arg=0xb7bf1d4c,
kw=0x0) at Objects/abstract.c:2506
#4  0x080cf882 in PyEval_CallObjectWithKeywords (func=0xb7d7728c,
arg=0xb7bf1d4c, kw=0x0) at Python/ceval.c:3781
#5  0x080f78ce in PyErr_PrintEx (set_sys_last_vars=1) at
Python/pythonrun.c:1146
#6  0x080f7f9c in PyRun_InteractiveOneFlags (fp=0xb7ef2440,
filename=0x8144910 "<stdin>", flags=0xbfe8a348)
    at Python/pythonrun.c:1037
#7  0x080f80f6 in PyRun_InteractiveLoopFlags (fp=0xb7ef2440,
filename=0x8144910 "<stdin>", flags=0xbfe8a348)
    at Python/pythonrun.c:763
#8  0x080f89e2 in PyRun_AnyFileExFlags (fp=0xb7ef2440,
filename=0x8144910 "<stdin>", closeit=0, flags=0xbfe8a348)
    at Python/pythonrun.c:732
#9  0x0805ac4e in Py_Main (argc=0, argv=0xbfe8a414) at Modules/main.c:599
#10 0x08059eb2 in main (argc=Cannot access memory at address 0x1
) at ./Modules/python.c:23