DetailedList - no smooth scroll and crash after 30s - macOS

[Ocupe]

Expected Behavior

Fluent scrolling, no jitter, no crash

Current Behavior

1. jitter when scrolling up and down.
2. app crashes after 30-60s of scrolling with this error:

/Users/Jonas/.local/share/virtualenvs/toga-Z1tvi9lv/bin/python -m detailedlist
Fatal Python error: deallocating None

Current thread 0x00007fffb2b9b380 (most recent call first):
  File "/Users/Jonas/Documents/Programming/PyBee/toga/src/cocoa/toga_cocoa/widgets/internal/refresh.py", line 172 in scrollWheel_
  File "/Users/Jonas/Documents/Programming/PyBee/rubicon-objc/rubicon/objc/runtime.py", line 1032 in _objc_method
  File "/Users/Jonas/Documents/Programming/PyBee/rubicon-objc/rubicon/objc/runtime.py", line 829 in __call__
  File "/Users/Jonas/Documents/Programming/PyBee/rubicon-objc/rubicon/objc/runtime.py", line 907 in __call__
  File "/Users/Jonas/Documents/Programming/PyBee/rubicon-objc/rubicon/objc/eventloop.py", line 621 in start
  File "/Users/Jonas/Documents/Programming/PyBee/rubicon-objc/rubicon/objc/eventloop.py", line 381 in run
  File "/Users/Jonas/Documents/Programming/PyBee/rubicon-objc/rubicon/objc/eventloop.py", line 425 in run_forever
  File "/Users/Jonas/Documents/Programming/PyBee/toga/src/cocoa/toga_cocoa/app.py", line 171 in main_loop
  File "/Users/Jonas/Documents/Programming/PyBee/toga/src/core/toga/app.py", line 169 in main_loop
  File "/Users/Jonas/Documents/Programming/PyBee/toga/examples/detailedlist/detailedlist/__main__.py", line 4 in <module>
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py", line 85 in _run_code
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py", line 193 in _run_module_as_main

Process finished with exit code 134 (interrupted by signal 6: SIGABRT)

Steps to reproduce

1. run the detailedlist.py example
2. scroll up and down for 30-60s.

Your Environment

• Python Version (3.6.5)

• Operating System and Version (select from the following and list the specific version number; if your OS is not listed, list that as well)

  • macOS - version: 10.13.5 (High Sierra)
  • Linux - distro: - version:
  • Windows - version:
  • Other - name: - version:

• Toga Target (the type of app you are trying to generate)

  • android
  • cocoa
  • django
  • gtk
  • iOS
  • tvOS
  • watchOS
  • winforms
  • win32
  • Other (please specify)

[nehararora]

The place where the crash happens seems to vary - I've reproduced a couple so far:

(toga3.6) nehar@nehar-macbook ~/D/s/b/t/e/detailedlist 𝓝𝓮𝓱𝓪𝓻 > python -m detailedlist
Fatal Python error: deallocating None

Current thread 0x00000001113835c0 (most recent call first):
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 90 in get_callable
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 99 in __call__
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 185 in __call__
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 206 in __call__
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 1026 in py_from_ns
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 147 in __call__
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 206 in __call__
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 558 in __getattr__
  File "/Users/nehar/Documents/src/beeware/toga-nehar/src/cocoa/toga_cocoa/widgets/internal/refresh.py", line 35 in documentRect
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 232 in __call__
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/runtime.py", line 685 in send_super
  File "/Users/nehar/Documents/src/beeware/toga-nehar/src/cocoa/toga_cocoa/widgets/internal/refresh.py", line 172 in scrollWheel_
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 232 in __call__
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 132 in __call__
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 206 in __call__
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/eventloop.py", line 635 in start
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/eventloop.py", line 399 in run
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/eventloop.py", line 442 in run_forever
  File "/Users/nehar/Documents/src/beeware/toga-nehar/src/cocoa/toga_cocoa/app.py", line 164 in main_loop
  File "/Users/nehar/Documents/src/beeware/toga-nehar/src/core/toga/app.py", line 188 in main_loop
  File "/Users/nehar/Documents/src/beeware/toga-nehar/examples/detailedlist/detailedlist/__main__.py", line 4 in <module>
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py", line 85 in _run_code
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py", line 193 in _run_module_as_main
fish: 'python -m detailedlist' terminated by signal SIGABRT (Abort)

(toga3.6) nehar@nehar-macbook ~/D/s/b/t/e/detailedlist 𝓝𝓮𝓱𝓪𝓻 > python -m detailedlist
Fatal Python error: deallocating None

Current thread 0x00000001087c25c0 (most recent call first):
  File "/Users/nehar/Documents/src/beeware/toga-nehar/src/cocoa/toga_cocoa/widgets/internal/refresh.py", line 13 in constrainScrollPoint_
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 232 in __call__
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/runtime.py", line 685 in send_super
  File "/Users/nehar/Documents/src/beeware/toga-nehar/src/cocoa/toga_cocoa/widgets/internal/refresh.py", line 172 in scrollWheel_
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 232 in __call__
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 132 in __call__
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/api.py", line 206 in __call__
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/eventloop.py", line 635 in start
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/eventloop.py", line 399 in run
  File "/Users/nehar/venvs/toga3.6/lib/python3.6/site-packages/rubicon/objc/eventloop.py", line 442 in run_forever
  File "/Users/nehar/Documents/src/beeware/toga-nehar/src/cocoa/toga_cocoa/app.py", line 164 in main_loop
  File "/Users/nehar/Documents/src/beeware/toga-nehar/src/core/toga/app.py", line 188 in main_loop
  File "/Users/nehar/Documents/src/beeware/toga-nehar/examples/detailedlist/detailedlist/__main__.py", line 4 in <module>
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py", line 85 in _run_code
  File "/opt/local/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/runpy.py", line 193 in _run_module_as_main
fish: 'python -m detailedlist' terminated by signal SIGABRT (Abort)

[lschumm]

reproed again

Process:               Python [5055]
Path:                  /usr/local/Cellar/python/3.7.3/Frameworks/Python.framework/Versions/3.7/Resources/Python.app/Contents/MacOS/Python
Identifier:            org.python.python
Version:               3.7.3 (3.7.3)
Code Type:             X86-64 (Native)
Parent Process:        bash [4937]
Responsible:           Python [5055]
User ID:               501

Date/Time:             2019-05-08 10:13:49.340 -0400
OS Version:            Mac OS X 10.14.4 (18E226)
Report Version:        12
Anonymous UUID:        29592E32-A3D8-3A8F-86A9-1C01038C48D5

Sleep/Wake UUID:       E82D7B35-578F-453B-A524-E119D295BD88

Time Awake Since Boot: 27000 seconds
Time Since Wake:       520 seconds

System Integrity Protection: disabled

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_CRASH (SIGABRT)
Exception Codes:       0x0000000000000000, 0x0000000000000000
Exception Note:        EXC_CORPSE_NOTIFY

Application Specific Information:
abort() called
Performing @selector(_doScroller:) from sender NSScroller 0x7ff75d316e20

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   libsystem_kernel.dylib        	0x00007fff63cd62c6 __pthread_kill + 10
1   libsystem_pthread.dylib       	0x00007fff63d8bbf1 pthread_kill + 284
2   libsystem_c.dylib             	0x00007fff63c406a6 abort + 127
3   org.python.python             	0x000000010b14cb25 fatal_error + 546
4   org.python.python             	0x000000010b14c903 Py_FatalError + 22
5   org.python.python             	0x000000010b0c63d7 none_dealloc + 16
6   org.python.python             	0x000000010b19b769 buffered_flush_and_rewind_unlocked + 34
7   org.python.python             	0x000000010b19dae8 buffered_flush + 140
8   org.python.python             	0x000000010b099351 _PyMethodDef_RawFastCallDict + 568
9   org.python.python             	0x000000010b098941 _PyCFunction_FastCallDict + 44
10  org.python.python             	0x000000010b099b26 _PyObject_CallFunctionVa + 92
11  org.python.python             	0x000000010b09a1f4 _PyObject_CallMethodId_SizeT + 172
12  org.python.python             	0x000000010b099351 _PyMethodDef_RawFastCallDict + 568
13  org.python.python             	0x000000010b098941 _PyCFunction_FastCallDict + 44
14  org.python.python             	0x000000010b099b26 _PyObject_CallFunctionVa + 92
15  org.python.python             	0x000000010b09a01e _PyObject_CallMethodId + 169
16  org.python.python             	0x000000010b14c4cd flush_std_files + 131
17  org.python.python             	0x000000010b14cb1b fatal_error + 536
18  org.python.python             	0x000000010b14c903 Py_FatalError + 22
19  org.python.python             	0x000000010b0c63d7 none_dealloc + 16
20  _ctypes.cpython-37m-darwin.so 	0x000000010c272411 PyCData_clear + 38
21  _ctypes.cpython-37m-darwin.so 	0x000000010c27236f PyCData_dealloc + 14
22  org.python.python             	0x000000010b0d1da7 subtype_dealloc + 907
23  org.python.python             	0x000000010b0a9d00 frame_dealloc + 160
24  org.python.python             	0x000000010b12e4d5 _PyEval_EvalCodeWithName + 1357
25  org.python.python             	0x000000010b098c53 _PyFunction_FastCallKeywords + 225
26  org.python.python             	0x000000010b12de27 call_function + 753
27  org.python.python             	0x000000010b126cdd _PyEval_EvalFrameDefault + 6762
28  org.python.python             	0x000000010b12e6d3 _PyEval_EvalCodeWithName + 1867
29  org.python.python             	0x000000010b0988c1 _PyFunction_FastCallDict + 441
30  org.python.python             	0x000000010b126e6d _PyEval_EvalFrameDefault + 7162
31  org.python.python             	0x000000010b12e6d3 _PyEval_EvalCodeWithName + 1867
32  org.python.python             	0x000000010b0988c1 _PyFunction_FastCallDict + 441
33  org.python.python             	0x000000010b0999ed _PyObject_Call_Prepend + 150
34  org.python.python             	0x000000010b0d65fb slot_tp_call + 71
35  org.python.python             	0x000000010b098d9b PyObject_Call + 136
36  _ctypes.cpython-37m-darwin.so 	0x000000010c277846 closure_fcn + 460
37  _ctypes.cpython-37m-darwin.so 	0x000000010c27cdca ffi_closure_unix64_inner + 485
38  _ctypes.cpython-37m-darwin.so 	0x000000010c27c4f6 ffi_closure_unix64 + 70
39  com.apple.AppKit              	0x00007fff34e7003e -[NSClipView constrainBoundsRect:] + 235
40  com.apple.AppKit              	0x00007fff34e6ff1e -[NSClipView _constrainBoundsRectAndAlignIfNeeded:] + 61
41  com.apple.AppKit              	0x00007fff34e79418 -[NSScrollView _stretchAmount] + 189
42  com.apple.AppKit              	0x00007fff34e7385d -[NSScrollView reflectScrolledClipView:] + 1119
43  com.apple.AppKit              	0x00007fff34ea80e3 -[NSClipView _scrollTo:animateScroll:flashScrollerKnobs:] + 1045
44  com.apple.AppKit              	0x00007fff35179a39 -[NSScrollView _doScroller:hitPart:multiplier:] + 1236
45  com.apple.AppKit              	0x00007fff3509fe80 -[NSApplication(NSResponder) sendAction:to:from:] + 312
46  com.apple.AppKit              	0x00007fff3510a196 -[NSControl sendAction:to:] + 86
47  com.apple.AppKit              	0x00007fff351794c8 -[NSScroller sendAction:to:] + 91
48  com.apple.AppKit              	0x00007fff35520eaa -[NSScroller _scrollByDelta:] + 873
49  com.apple.AppKit              	0x00007fff35178d4a -[NSScrollingBehaviorLegacy _scrollView:smoothScrollWithEvent:] + 2777
50  com.apple.AppKit              	0x00007fff35177e76 -[NSScrollingBehaviorLegacy scrollView:scrollWheelWithEvent:] + 1222
51  _ctypes.cpython-37m-darwin.so 	0x000000010c27c377 ffi_call_unix64 + 79
52  _ctypes.cpython-37m-darwin.so 	0x000000010c27cb3d ffi_call + 713
53  _ctypes.cpython-37m-darwin.so 	0x000000010c2783f2 _ctypes_callproc + 647
54  _ctypes.cpython-37m-darwin.so 	0x000000010c272e25 PyCFuncPtr_call + 500
55  org.python.python             	0x000000010b098d9b PyObject_Call + 136
56  org.python.python             	0x000000010b126e6d _PyEval_EvalFrameDefault + 7162
57  org.python.python             	0x000000010b12e6d3 _PyEval_EvalCodeWithName + 1867
58  org.python.python             	0x000000010b098c53 _PyFunction_FastCallKeywords + 225
59  org.python.python             	0x000000010b12de27 call_function + 753
60  org.python.python             	0x000000010b126c35 _PyEval_EvalFrameDefault + 6594
61  org.python.python             	0x000000010b12e6d3 _PyEval_EvalCodeWithName + 1867
62  org.python.python             	0x000000010b0988c1 _PyFunction_FastCallDict + 441
63  org.python.python             	0x000000010b126e6d _PyEval_EvalFrameDefault + 7162
64  org.python.python             	0x000000010b12e6d3 _PyEval_EvalCodeWithName + 1867
65  org.python.python             	0x000000010b0988c1 _PyFunction_FastCallDict + 441
66  org.python.python             	0x000000010b0999ed _PyObject_Call_Prepend + 150
67  org.python.python             	0x000000010b0d65fb slot_tp_call + 71
68  org.python.python             	0x000000010b098d9b PyObject_Call + 136
69  _ctypes.cpython-37m-darwin.so 	0x000000010c277846 closure_fcn + 460
70  _ctypes.cpython-37m-darwin.so 	0x000000010c27cdca ffi_closure_unix64_inner + 485
71  _ctypes.cpython-37m-darwin.so 	0x000000010c27c4f6 ffi_closure_unix64 + 70
72  com.apple.AppKit              	0x00007fff3517b6f3 __68-[NSScrollingBehaviorLegacy _latchMomentumScrollEventsToScrollView:]_block_invoke + 89
73  com.apple.AppKit              	0x00007fff34db9c9b _NSSendEventToObservers + 337
74  com.apple.AppKit              	0x00007fff34db85dc -[NSApplication(NSEvent) sendEvent:] + 100
75  com.apple.AppKit              	0x00007fff34da6ee8 -[NSApplication run] + 755
76  _ctypes.cpython-37m-darwin.so 	0x000000010c27c377 ffi_call_unix64 + 79
77  _ctypes.cpython-37m-darwin.so 	0x000000010c27cb3d ffi_call + 713
78  _ctypes.cpython-37m-darwin.so 	0x000000010c2783f2 _ctypes_callproc + 647
79  _ctypes.cpython-37m-darwin.so 	0x000000010c272e25 PyCFuncPtr_call + 500
80  org.python.python             	0x000000010b098d9b PyObject_Call + 136
81  org.python.python             	0x000000010b126e6d _PyEval_EvalFrameDefault + 7162
82  org.python.python             	0x000000010b12e6d3 _PyEval_EvalCodeWithName + 1867
83  org.python.python             	0x000000010b0988c1 _PyFunction_FastCallDict + 441
84  org.python.python             	0x000000010b0999ed _PyObject_Call_Prepend + 150
85  org.python.python             	0x000000010b0d65fb slot_tp_call + 71
86  org.python.python             	0x000000010b098d9b PyObject_Call + 136
87  org.python.python             	0x000000010b126e6d _PyEval_EvalFrameDefault + 7162
88  org.python.python             	0x000000010b12e6d3 _PyEval_EvalCodeWithName + 1867
89  org.python.python             	0x000000010b0988c1 _PyFunction_FastCallDict + 441
90  org.python.python             	0x000000010b0999ed _PyObject_Call_Prepend + 150
91  org.python.python             	0x000000010b0d65fb slot_tp_call + 71
92  org.python.python             	0x000000010b098af4 _PyObject_FastCallKeywords + 358
93  org.python.python             	0x000000010b12de20 call_function + 746
94  org.python.python             	0x000000010b126b9a _PyEval_EvalFrameDefault + 6439
95  org.python.python             	0x000000010b099068 function_code_fastcall + 112
96  org.python.python             	0x000000010b12de27 call_function + 753
97  org.python.python             	0x000000010b126b81 _PyEval_EvalFrameDefault + 6414
98  org.python.python             	0x000000010b099068 function_code_fastcall + 112
99  org.python.python             	0x000000010b12de27 call_function + 753
100 org.python.python             	0x000000010b126b81 _PyEval_EvalFrameDefault + 6414
101 org.python.python             	0x000000010b12e6d3 _PyEval_EvalCodeWithName + 1867
102 org.python.python             	0x000000010b098c53 _PyFunction_FastCallKeywords + 225
103 org.python.python             	0x000000010b12de27 call_function + 753
104 org.python.python             	0x000000010b126cdd _PyEval_EvalFrameDefault + 6762
105 org.python.python             	0x000000010b099068 function_code_fastcall + 112
106 org.python.python             	0x000000010b12de27 call_function + 753
107 org.python.python             	0x000000010b126b81 _PyEval_EvalFrameDefault + 6414
108 org.python.python             	0x000000010b099068 function_code_fastcall + 112
109 org.python.python             	0x000000010b12de27 call_function + 753
110 org.python.python             	0x000000010b126b81 _PyEval_EvalFrameDefault + 6414
111 org.python.python             	0x000000010b12e6d3 _PyEval_EvalCodeWithName + 1867
112 org.python.python             	0x000000010b1251d0 PyEval_EvalCode + 51
113 org.python.python             	0x000000010b122c6e builtin_exec + 554
114 org.python.python             	0x000000010b0996f2 _PyMethodDef_RawFastCallKeywords + 495
115 org.python.python             	0x000000010b098c8e _PyCFunction_FastCallKeywords + 44
116 org.python.python             	0x000000010b12ddb2 call_function + 636
117 org.python.python             	0x000000010b126c35 _PyEval_EvalFrameDefault + 6594
118 org.python.python             	0x000000010b12e6d3 _PyEval_EvalCodeWithName + 1867
119 org.python.python             	0x000000010b098c53 _PyFunction_FastCallKeywords + 225
120 org.python.python             	0x000000010b12de27 call_function + 753
121 org.python.python             	0x000000010b126c35 _PyEval_EvalFrameDefault + 6594
122 org.python.python             	0x000000010b12e6d3 _PyEval_EvalCodeWithName + 1867
123 org.python.python             	0x000000010b0988c1 _PyFunction_FastCallDict + 441
124 org.python.python             	0x000000010b16b464 pymain_run_module + 147
125 org.python.python             	0x000000010b16a50c pymain_main + 4179
126 org.python.python             	0x000000010b16b088 _Py_UnixMain + 56
127 libdyld.dylib                 	0x00007fff63b9b3d5 start + 1

Thread 1:
0   libsystem_pthread.dylib       	0x00007fff63d883f0 start_wqthread + 0

Thread 2:
0   libsystem_pthread.dylib       	0x00007fff63d883f0 start_wqthread + 0

Thread 3:: com.apple.CFSocket.private
0   libsystem_kernel.dylib        	0x00007fff63cd761a __select + 10
1   com.apple.CoreFoundation      	0x00007fff37755ad2 __CFSocketManager + 635
2   libsystem_pthread.dylib       	0x00007fff63d892eb _pthread_body + 126
3   libsystem_pthread.dylib       	0x00007fff63d8c249 _pthread_start + 66
4   libsystem_pthread.dylib       	0x00007fff63d8840d thread_start + 13

Thread 4:
0   libsystem_pthread.dylib       	0x00007fff63d883f0 start_wqthread + 0

Thread 5:: com.apple.NSEventThread
0   libsystem_kernel.dylib        	0x00007fff63cd022a mach_msg_trap + 10
1   libsystem_kernel.dylib        	0x00007fff63cd076c mach_msg + 60
2   com.apple.CoreFoundation      	0x00007fff3772813e __CFRunLoopServiceMachPort + 328
3   com.apple.CoreFoundation      	0x00007fff377276ac __CFRunLoopRun + 1612
4   com.apple.CoreFoundation      	0x00007fff37726e0e CFRunLoopRunSpecific + 455
5   com.apple.AppKit              	0x00007fff34db5d1a _NSEventThread + 175
6   libsystem_pthread.dylib       	0x00007fff63d892eb _pthread_body + 126
7   libsystem_pthread.dylib       	0x00007fff63d8c249 _pthread_start + 66
8   libsystem_pthread.dylib       	0x00007fff63d8840d thread_start + 13

Thread 6:
0   libsystem_pthread.dylib       	0x00007fff63d883f0 start_wqthread + 0

Thread 7:
0   libsystem_pthread.dylib       	0x00007fff63d883f0 start_wqthread + 0

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x0000000000000000  rbx: 0x000000010bd565c0  rcx: 0x00007ffee4b83748  rdx: 0x0000000000000000
  rdi: 0x0000000000000307  rsi: 0x0000000000000006  rbp: 0x00007ffee4b83780  rsp: 0x00007ffee4b83748
   r8: 0x00000000000130a8   r9: 0x00007fff96b98048  r10: 0x0000000000000000  r11: 0x0000000000000206
  r12: 0x0000000000000307  r13: 0x00007fff96b989a0  r14: 0x0000000000000006  r15: 0x000000000000002d
  rip: 0x00007fff63cd62c6  rfl: 0x0000000000000206  cr2: 0x00007fff96b96188
  
Logical CPU:     0
Error Code:      0x02000148
Trap Number:     133


Binary Images:
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    0x7fff63a40000 -     0x7fff63ac4fc7  libcorecrypto.dylib (602.250.23) <3A6CBD41-AFFE-3E06-B1EC-3E95BC79BAC5> /usr/lib/system/libcorecrypto.dylib
    0x7fff63b4b000 -     0x7fff63b84ff7  libdispatch.dylib (1008.250.7) <50235FCE-B399-3319-90DC-88F530D4FC5C> /usr/lib/system/libdispatch.dylib
    0x7fff63b85000 -     0x7fff63bb1ff7  libdyld.dylib (655.1.1) <54C6B494-4A3D-3EEC-B083-636A76AAD649> /usr/lib/system/libdyld.dylib
    0x7fff63bb2000 -     0x7fff63bb2ffb  libkeymgr.dylib (30) <BEA04E04-FCF1-3A70-810F-08D0FF54CA36> /usr/lib/system/libkeymgr.dylib
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    0x7fff63bc0000 -     0x7fff63bc0ff7  liblaunch.dylib (1336.251.2) <30E6424E-4640-3DBA-9B64-D5F725263C6E> /usr/lib/system/liblaunch.dylib
    0x7fff63bc1000 -     0x7fff63bc6fff  libmacho.dylib (927.0.2) <D8515A20-ED7B-3B13-9ADA-4BD7E19E38C4> /usr/lib/system/libmacho.dylib
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    0x7fff63c71000 -     0x7fff63c74ff7  libsystem_coreservices.dylib (66) <4CF1C89B-FA6C-3DF3-B1F8-79F549849534> /usr/lib/system/libsystem_coreservices.dylib
    0x7fff63c75000 -     0x7fff63c7bfff  libsystem_darwin.dylib (1272.250.1) <6983A268-20F4-3F98-A3F5-D63848933B02> /usr/lib/system/libsystem_darwin.dylib
    0x7fff63c7c000 -     0x7fff63c82ff7  libsystem_dnssd.dylib (878.250.4) <9FC5724C-DD03-3E14-A6E1-2DD009D79E0A> /usr/lib/system/libsystem_dnssd.dylib
    0x7fff63c83000 -     0x7fff63cceffb  libsystem_info.dylib (517.200.9) <F617D3CF-5A4A-36D0-8CBB-4A7C7CDB67AF> /usr/lib/system/libsystem_info.dylib
    0x7fff63ccf000 -     0x7fff63cf7ff7  libsystem_kernel.dylib (4903.251.3) <84EF0290-6CB5-36E5-A273-692A7E437B36> /usr/lib/system/libsystem_kernel.dylib
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    0x7fff63d44000 -     0x7fff63d68fff  libsystem_malloc.dylib (166.251.2) <90DA09E3-1276-3FCF-8F5F-C9AA61AB9B6D> /usr/lib/system/libsystem_malloc.dylib
    0x7fff63d69000 -     0x7fff63d73ff7  libsystem_networkextension.dylib (767.250.2) <4575D797-B793-3D18-9E93-8696CF0B133B> /usr/lib/system/libsystem_networkextension.dylib
    0x7fff63d74000 -     0x7fff63d7bfff  libsystem_notify.dylib (172.200.21) <679E9132-1A46-326E-9A11-D3FF9C86041C> /usr/lib/system/libsystem_notify.dylib
    0x7fff63d7c000 -     0x7fff63d85fef  libsystem_platform.dylib (177.250.1) <3CC59141-5365-3848-94C3-D65E6FCA1E74> /usr/lib/system/libsystem_platform.dylib
    0x7fff63d86000 -     0x7fff63d90ff7  libsystem_pthread.dylib (330.250.2) <4344198A-A1A3-3C52-97B4-F168D56E9789> /usr/lib/system/libsystem_pthread.dylib
    0x7fff63d91000 -     0x7fff63d94ff7  libsystem_sandbox.dylib (851.250.12) <66E91015-F62A-3365-BB81-AA88707E8F12> /usr/lib/system/libsystem_sandbox.dylib
    0x7fff63d95000 -     0x7fff63d97ff3  libsystem_secinit.dylib (30.220.1) <F054DCB0-68CE-35E7-8B8C-D648C42124EC> /usr/lib/system/libsystem_secinit.dylib
    0x7fff63d98000 -     0x7fff63d9fff3  libsystem_symptoms.dylib (820.257.1) <C8517F35-E9DA-3649-B07D-2B38349C6730> /usr/lib/system/libsystem_symptoms.dylib
    0x7fff63da0000 -     0x7fff63db5fff  libsystem_trace.dylib (906.250.5) <AE77ACC7-488F-3AE1-BB0C-1ACFC7E1CE77> /usr/lib/system/libsystem_trace.dylib
    0x7fff63db7000 -     0x7fff63dbcffb  libunwind.dylib (35.4) <8F0BC197-B97C-3DDC-92B0-6A7D3CB72FD8> /usr/lib/system/libunwind.dylib
    0x7fff63dbd000 -     0x7fff63decff7  libxpc.dylib (1336.251.2) <49138829-09C8-355C-B558-97E070B84EC5> /usr/lib/system/libxpc.dylib

External Modification Summary:
  Calls made by other processes targeting this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by this process:
    task_for_pid: 0
    thread_create: 0
    thread_set_state: 0
  Calls made by all processes on this machine:
    task_for_pid: 318234
    thread_create: 0
    thread_set_state: 0

VM Region Summary:
ReadOnly portion of Libraries: Total=452.2M resident=0K(0%) swapped_out_or_unallocated=452.2M(100%)
Writable regions: Total=130.8M written=0K(0%) resident=0K(0%) swapped_out=0K(0%) unallocated=130.8M(100%)
 
                                VIRTUAL   REGION 
REGION TYPE                        SIZE    COUNT (non-coalesced) 
===========                     =======  ======= 
Accelerate framework               256K        2 
Activity Tracing                   256K        1 
CG backing stores                  240K        2 
CG image                          2132K        7 
CoreAnimation                     12.1M       13 
CoreGraphics                         8K        1 
CoreImage                            8K        2 
CoreUI image data                  340K        8 
CoreUI image file                  196K        3 
Dispatch continuations            8192K        1 
Foundation                           4K        1 
Image IO                          1024K        1 
Kernel Alloc Once                    8K        1 
MALLOC                            62.8M       52 
MALLOC guard page                   32K        7 
MALLOC_LARGE (reserved)            384K        1         reserved VM address space (unallocated)
Memory Tag 242                      12K        1 
STACK GUARD                         32K        8 
Stack                             19.6M        8 
VM_ALLOCATE                       24.4M       37 
__DATA                            30.7M      298 
__FONT_DATA                          4K        1 
__LINKEDIT                       222.6M       32 
__TEXT                           229.6M      296 
__UNICODE                          564K        1 
mapped file                      156.4M       31 
shared memory                      632K        9 
===========                     =======  ======= 
TOTAL                            772.2M      825 
TOTAL, minus reserved VM space   771.8M      825 

Model: MacBookAir7,1, BootROM 184.0.0.0.0, 2 processors, Intel Core i5, 1.6 GHz, 4 GB, SMC 2.26f2
Graphics: kHW_IntelHDGraphics6000Item, Intel HD Graphics 6000, spdisplays_builtin
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1600 MHz, 0x80AD, 0x483943434E4E4E384A544D4C41522D4E544D
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1600 MHz, 0x80AD, 0x483943434E4E4E384A544D4C41522D4E544D
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x117), Broadcom BCM43xx 1.0 (7.77.61.2 AirPortDriverBrcmNIC-1305.8)
Bluetooth: Version 6.0.11f4, 3 services, 27 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en0
USB Device: USB 3.0 Bus
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
Thunderbolt Bus: MacBook Air, Apple Inc., 27.2

[lschumm]

the crash appears to be due to Objective-C deallocating the None singleton.

[freakboy3742]

@dgelessus If you happen to have some spare time and are looking for a gnarly problem to debug, you might enjoy this one :-)

@lschumm and I spend a few hours trying to narrow it down at the PyCon sprints, but ran out of time. As best as we could work out, there are conditions where invoking send_super() will cause Objective C to decrement the Python reference count to the None singleton. We were able to observe it reliably in the override of [NSScrollView scrollWheel:event] that exists in toga_cocoa/widgets/internal/refresh.py; calls to super that include a complex object (like an NSEvent) exhibit the problem, but references to structs (like NSRect) or supers with no arguments don't (at least - not as far as we could observe).

[dgelessus]

Turns out that the root cause of the crash is a bug in ctypes itself, which I've reported now (bpo-36880). Whenever a ctypes callback with restype py_object returns None, the refcount of None is decremented once too much.

In this example, the bug is triggered a few times for each scroll operation. If this happens often enough, None's refcount decreases to zero - this is never supposed to happen, so Python crashes.

The code that triggers the bug is in rubicon-objc here. In this case we can probably work around the bug by returning an object other than None from the callback - I'll try to work on a patch for Rubicon soon, so that we don't have to wait for the bug to be fixed in CPython.

[freakboy3742]

Thanks to the awesome debugging work by @lschumm and @dgelessus, this bug has now been squashed; Rubicon 0.3.1 includes the code necessary to work around this problem.