BUS error when trying to delete object at line 382 in $ACE_ROOT/ace/OS.cpp in 
~ACE_Cleanup_Info_Node() [next_ member variable]. ~TAO_Singleton_Manager() is in 
the call chain when the crash occurs.

    DESCRIPTION:
My program is a mixture of ACE [outside of TAO's usage of ACE] & TAO code. I 
have an ACE_Task derived object (RFActiveORB) that has as a member variable orb_ 
[a CORBA::ORB_var]. The RFActiveORB::open() method sets the orb_ variable via 
orb_ = CORBA::ORB_init( argv_->argc(), argv_->argv(), orbName.c_str() );
Ok, so far so good. 
The problem is that long after the RFActiveORB object has been destructed 
[orb_->shutdown() has been invoked prior to the RFActiveORB dtor being invoked], 
the ACE_OS_Object_Manager_Manager dtor is trying to delete memory pointed to by 
a ACE_Cleanup_Info_Node::next_ member variable. The pointer value in the next_ 
field is the pointer obtained at line 91 in tao/TAO_Singleton.cpp [the 
TAO_Singleton object is obtained just prior to registering the TAO_Singleton for 
destruction with the TAO_Singleton_Manager].

I've attached the script session recorded while using dbx to trace out where the
ACE_Cleanup_Info_Node object are instantiated. I took the liberty of converting 
the script file with dos2unix to remove the CR characters. There are still lots 
of escape sequence in the session file (terminal sequences for bolding,etc.) - 
sorry. This is also an edited version to save space. I have the un-edited 
version if it is needed.
At the end of the dbx session file, you'll see that the address of the 
ACE_Cleanup_Info_Node with the bogus next_ value is 0x1553fd8. The object_ field 
value is 0x155ba68 which by examining the arguments passed to 
TAO_Singleton_Manager::at_exit() is the TAO_Singleton object instantiated at 
line 91 in tao/TAO_Singleton.cpp. The crash info is at the end of the dbx 
session.

An interesting observation is that the value of the next_ field at the time of 
the crash is  0x1553ee8. It is a ACE_Cleanup_Info_Node object (look for: this = 
0x1553ee8). I'm using several dbx ' when in ACE_Cleanup_Info_Node { print this; 
where; } ' commands to try to determine where this object pointed to by the 
next_ field is created. Since I am doing this for every ACE_Cleanup_Info_Node 
constructor, I am expecting to see this address show up as a value of this in a 
trace of a constructor call. I don't. But I do see it as a next_ field value 
(again, look for: next_ = 0x1553ee8). So insert is being invoked on an 
ACE_Cleanup_Info_Node object that I can't see where it is being constructed. 
Now, 1553ee8 is quad aligned so I am assuming it is allocated off the heap.

    REPEAT BY:
I let the app startup and then I did a 'kill -TERM pid' which our 
ACE_Task_Base-derived RFSigMgr class [signals are trapped on one thread only via 
a RFSigMgr private reactor] intercepts & dispatches, causing the app's 'main' 
object to be closed(), thus causing the various ACE_Task derived objects to go 
out of scope.

I'm putting the entire email from 5/9/2001 onto a web site 
this evening [http://users.tellurian.net/fooz/TAO_Object_Manager.txt] so you can 
grab it instead of me pasting the dbx session log here.