K, here's what I got:
(gdb) file /SystemApps/Gorm.app/Gorm
Reading symbols from /SystemApps/Gorm.app/Gorm...done.
(gdb) r
Starting program: /SystemApps/Gorm.app/Gorm
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
2013-12-28 18:09:25.880 Gorm[3541] File GSDictionary.m: 455. In -[GSMutableDictionary removeObjectForKey:] attempt to remove nil key from dictionary {}
Program received signal SIGSEGV, Segmentation fault.
-[NSWindow sendEvent:] (self=0x0, _cmd=<optimized out>, theEvent=0xb4bd20)
at NSWindow.m:4288
4288 NSWindow.m: No such file or directory.
(gdb) bt
#0 -[NSWindow sendEvent:] (self=0x0, _cmd=<optimized out>, theEvent=0xb4bd20)
at NSWindow.m:4288
#1 0x00007ffff7201e8c in -[GSDragView(Private) _handleDrag:slidePoint:] (
self=0xc22440, _cmd=<optimized out>, theEvent=0xd52c80, slidePoint=...)
at GSDragView.m:720
#2 0x00007ffff71ffffe in -[GSDragView dragImage:at:offset:event:pasteboard:source:slideBack:] (self=0xc22440, _cmd=<optimized out>, anImage=0x7b0fe0,
screenLocation=..., initialOffset=..., event=0xda00a0,
pboard=<optimized out>, sourceObject=0xcb8bc0, slideFlag=1 '\001')
at GSDragView.m:290
#3 0x00007ffff049b254 in -[XGDragView dragImage:at:offset:event:pasteboard:source:slideBack:] (self=0xc22440, _cmd=<optimized out>, anImage=0x7b0fe0,
screenLocation=..., initialOffset=..., event=0xda00a0, pboard=0xd87800,
sourceObject=0xcb8bc0, slideFlag=1 '\001') at XGDragView.m:228
#4 0x00007ffff71d361a in -[NSWindow dragImage:at:offset:event:pasteboard:source:slideBack:] (self=0xcab1a0, _cmd=<optimized out>, anImage=0x7b0fe0,
baseLocation=..., initialOffset=..., event=0xda00a0,
pboard=<optimized out>, sourceObject=<optimized out>, slideFlag=1 '\001')
at NSWindow.m:4548
#5 0x00007ffff71bd7a8 in -[NSView dragImage:at:offset:event:pasteboard:source:slideBack:] (self=0xcb8bc0, _cmd=<optimized out>, anImage=0x7b0fe0,
viewLocation=..., initialOffset=..., event=0xda00a0,
pboard=<optimized out>, sourceObject=<optimized out>, slideFlag=1 '\001')
---Type <return> to continue, or q <return> to quit---
at NSView.m:3858
#6 0x00007ffff7b2983c in -[GormObjectEditor mouseDown:] (self=0xcb8bc0,
_cmd=<optimized out>, theEvent=0xda00a0) at GormObjectEditor.m:481
#7 0x00007ffff71df003 in -[NSWindow sendEvent:] (self=0xcab1a0,
_cmd=<optimized out>, theEvent=0xda00a0) at NSWindow.m:3790
#8 0x00007ffff7052fc5 in -[NSApplication run] (self=0x8b99d0,
_cmd=<optimized out>) at NSApplication.m:1562
#9 0x00007ffff7032945 in NSApplicationMain (argc=<optimized out>,
argv=<optimized out>) at Functions.m:91
#10 0x00007ffff5ee676d in __libc_start_main ()
from /lib/x86_64-linux-gnu/libc.so.6
#11 0x0000000000401965 in _start ()
(gdb)
For this I started out with an empty document (Document>New Module>New Empty), added a window and attempted to make a connection from the window to NSOwner, within the document window. Next I'll try between a control and NSOwner.