Matt - Ok, I installed everything and the system is running fine (or no worse). However, we still faced one restart so far. I have included the debug information below. This looks similiar to the problem report on sourceforge: http://sourceforge.net/tracker/?func=detail&atid=105470&aid=471942&group_id=... I posted a comment to see if they have any updates. One question ... does anyone every malloc a plain ClassExtension object? It seems that every CE-based object has their own struct typedef. If so, then I think yesterday's patch problaby won't do any harm but won't help either. The current running process is being monitored by truss so I will be able to get at least one more core dump (if we get one). I won't be able to get any more information until tomorrow. Any other ideas? Thanks for your help. - joe . (gdb) info threads 17 Thread 10 0xef5b9810 in _lwp_sema_wait () 16 Thread 9 0xef647cac in _swtch () 15 Thread 8 0xef5b9810 in _lwp_sema_wait () 14 Thread 7 (LWP 5) 0xcaeb50 in ?? () 13 Thread 6 0xef647cac in _swtch () 12 Thread 5 0xef5b9810 in _lwp_sema_wait () 11 Thread 4 0xef647cac in _swtch () 10 Thread 3 0xef647cac in _swtch () 9 Thread 2 (LWP 2) 0xef5b9958 in _signotifywait () 8 Thread 1 (LWP 6) 0xef5b7488 in _poll () 7 LWP 8 0xef5b6a24 in door_restart () 6 LWP 6 0xef5b7488 in _poll () 5 LWP 5 0xcaeb50 in ?? () 4 LWP 4 0xef5b9810 in _lwp_sema_wait () 3 LWP 3 0xef5b9810 in _lwp_sema_wait () 2 LWP 2 0xef5b9958 in _signotifywait () * 1 LWP 1 0xef5b9810 in _lwp_sema_wait () (gdb) thread 14 [Switching to Thread 7 (LWP 5)] #0 0xcaeb50 in ?? () (gdb) where #0 0xcaeb50 in ?? () #1 0x516bc in collect (young=0x13dec8, old=0x13ded4) at ./Modules/gcmodule.c:379 #2 0x51984 in collect_generations () at ./Modules/gcmodule.c:484 #3 0x519fc in _PyGC_Insert (op=0xecf7d4) at ./Modules/gcmodule.c:507 #4 0x664ec in PyMethod_New (func=0x3f796c, self=0x11c0d44, class=0x3c7e5c) at Objects/classobject.c:1834 #5 0x63850 in instance_getattr2 (inst=0x11c0d44, name=0x3d5378) at Objects/classobject.c:642 #6 0x63750 in instance_getattr1 (inst=0x11c0d44, name=0x3d5378) at Objects/classobject.c:608 #7 0x63898 in instance_getattr (inst=0x11c0d44, name=0x3d5378) at Objects/classobject.c:656 #8 0x78330 in PyObject_GetAttr (v=0x11c0d44, name=0x3d5378) at Objects/object.c:1052 #9 0x895ec in builtin_hasattr (self=0x0, args=0x12ed944) at Python/bltinmodule.c:886 #10 0x35a44 in call_cfunction (func=0x1609b0, arg=0x12ed944, kw=0x0) at Python/ceval.c:2854 #11 0x33c5c in eval_code2 (co=0x3cbf80, globals=0x1, locals=0x0, args=0x2, argcount=0, kws=0x0, kwcount=0, defs=0x0, defcount=0, closure=0x0) at Python/ceval.c:1948 and so on ....