Application crashes in proof mode when clicking on rule category text instead of small arrow

[Aerylia]

Issue as described in the title.
It seems to happen occasionally when clicking the rules themselves, but I have yet to identify where I need to be clicking for it to consistently happen.

I'm on MacBook Air M1 MacOs Sonoma 14.2.1

It seems to be a UI issue with QT throwing an uncaught exception.

The error:

qt.qpa.fonts: Populating font family aliases took 49 ms. Replace uses of missing font family "Monospace" with one that exists to avoid this cost.
2024-01-25 15:50:52.258 python[6110:10111293] The class 'NSOpenPanel' overrides the method identifier. This method is implemented by class 'NSWindow'
2024-01-25 15:51:41.788 python[6110:10111293] The class 'NSSavePanel' overrides the method identifier. This method is implemented by class 'NSWindow'
*** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndexedSubscript:]: index 6 beyond bounds [0 .. 5]'
*** First throw call stack:
(
0 CoreFoundation 0x0000000184864570 __exceptionPreprocess + 176
1 libobjc.A.dylib 0x0000000184355eb4 objc_exception_throw + 60
2 CoreFoundation 0x00000001847dad10 -[__NSCFString hasSuffix:] + 0
3 libqcocoa.dylib 0x000000012ecb8124 _ZN20QCocoaSystemTrayIcon13emitActivatedEv + 269336
4 libqcocoa.dylib 0x000000012ecb81a8 _ZN20QCocoaSystemTrayIcon13emitActivatedEv + 269468
5 libqcocoa.dylib 0x000000012ecb677c _ZN20QCocoaSystemTrayIcon13emitActivatedEv + 262768
6 QtWidgets 0x00000001186e50b0 ZN9QTreeView14currentChangedERK11QModelIndexS2 + 452
7 QtCore 0x000000011d3c5788 _ZN11QMetaObject8activateEP7QObjectPKS_iPPv + 3780
8 QtCore 0x000000011d58a18c _ZN19QItemSelectionModel15setCurrentIndexERK11QModelIndex6QFlagsINS_13SelectionFlagEE + 324
9 QtWidgets 0x000000011866e31c _ZN17QAbstractItemView15mousePressEventEP11QMouseEvent + 880
10 QtWidgets 0x00000001186ddf7c _ZN9QTreeView15mousePressEventEP11QMouseEvent + 260
11 QtWidgets 0x0000000118442330 _ZN7QWidget5eventEP6QEvent + 132
12 QtWidgets 0x00000001184c6060 _ZN6QFrame5eventEP6QEvent + 56
13 QtWidgets 0x000000011866df3c _ZN17QAbstractItemView13viewportEventEP6QEvent + 988
14 QtWidgets 0x00000001186db37c _ZN9QTreeView13viewportEventEP6QEvent + 328
15 QtCore 0x000000011d37c25c _ZN23QCoreApplicationPrivate29sendThroughObjectEventFiltersEP7QObjectP6QEvent + 244
16 QtWidgets 0x00000001183f8fcc _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 240
17 QtWidgets 0x00000001183fb03c _ZN12QApplication6notifyEP7QObjectP6QEvent + 5100
18 QtCore 0x000000011d37bf88 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent + 292
19 QtWidgets 0x00000001183f958c _ZN19QApplicationPrivate14sendMouseEventEP7QWidgetP11QMouseEventS1_S1_PS1_R8QPointerIS0_Ebb + 808
20 QtWidgets 0x00000001184569b0 _ZNK21QWidgetRepaintManager3rhiEv + 9912
21 QtWidgets 0x0000000118455c68 _ZNK21QWidgetRepaintManager3rhiEv + 6512
22 QtWidgets 0x00000001183f8fec _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 272
23 QtWidgets 0x00000001183f9e50 _ZN12QApplication6notifyEP7QObjectP6QEvent + 512
24 QtCore 0x000000011d37bf88 _ZN16QCoreApplication15notifyInternal2EP7QObjectP6QEvent + 292
25 QtGui 0x000000011e88a794 _ZN22QGuiApplicationPrivate17processMouseEventEPN29QWindowSystemInterfacePrivate10MouseEventE + 1748
26 QtGui 0x000000011e8e1aa4 _ZN22QWindowSystemInterface22sendWindowSystemEventsE6QFlagsIN10QEventLoop17ProcessEventsFlagEE + 396
27 libqcocoa.dylib 0x000000012ec5bd40 qt_plugin_instance + 54740
28 CoreFoundation 0x00000001847efa4c CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 28
29 CoreFoundation 0x00000001847ef9e0 __CFRunLoopDoSource0 + 176
30 CoreFoundation 0x00000001847ef750 __CFRunLoopDoSources0 + 244
31 CoreFoundation 0x00000001847ee340 __CFRunLoopRun + 828
32 CoreFoundation 0x00000001847ed9ac CFRunLoopRunSpecific + 608
33 HIToolbox 0x000000018ed9c448 RunCurrentEventLoopInMode + 292
34 HIToolbox 0x000000018ed9c0d8 ReceiveNextEventCommon + 220
35 HIToolbox 0x000000018ed9bfdc _BlockUntilNextEventMatchingListInModeWithFilter + 76
36 AppKit 0x0000000187fca8a4 _DPSNextEvent + 660
37 AppKit 0x00000001887a4980 -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 716
38 AppKit 0x0000000187fbdd50 -[NSApplication run] + 476
39 libqcocoa.dylib 0x000000012ec5a644 qt_plugin_instance + 48856
40 QtCore 0x000000011d3858fc _ZN10QEventLoop4execE6QFlagsINS_17ProcessEventsFlagEE + 532
41 QtCore 0x000000011d37c614 _ZN16QCoreApplication4execEv + 112
42 QtWidgets.abi3.so 0x000000011e2af2d4 _ZL26Sbk_QApplicationFunc_exec_P7_object + 164
43 python3.10 0x0000000104c63920 cfunction_vectorcall_NOARGS + 248
44 python3.10 0x0000000104d00630 call_function + 524
45 python3.10 0x0000000104cfbf50 _PyEval_EvalFrameDefault + 24792
46 python3.10 0x0000000104cf550c _PyEval_Vector + 2000
47 python3.10 0x0000000104d00630 call_function + 524
48 python3.10 0x0000000104cfbf50 _PyEval_EvalFrameDefault + 24792
49 python3.10 0x0000000104cf550c _PyEval_Vector + 2000
50 python3.10 0x0000000104cf4d0c PyEval_EvalCode + 120
51 python3.10 0x0000000104cf0918 builtin_exec + 836
52 python3.10 0x0000000104c63b44 cfunction_vectorcall_FASTCALL + 200
53 python3.10 0x0000000104d00630 call_function + 524
54 python3.10 0x0000000104cfc4a4 _PyEval_EvalFrameDefault + 26156
55 python3.10 0x0000000104cf550c _PyEval_Vector + 2000
56 python3.10 0x0000000104d00630 call_function + 524
57 python3.10 0x0000000104cfc4a4 _PyEval_EvalFrameDefault + 26156
58 python3.10 0x0000000104cf550c _PyEval_Vector + 2000
59 python3.10 0x0000000104d740d8 pymain_run_module + 272
60 python3.10 0x0000000104d73718 Py_RunMain + 1584
61 python3.10 0x0000000104d74b88 pymain_main + 1212
62 python3.10 0x0000000104bb9e4c main + 56
63 dyld 0x00000001843910e0 start + 2360
)
libc++abi: terminating due to uncaught exception of type NSException
Abort trap: 6

[RazinShaikh]

This looks a bit difficult to debug and the error does not say what caused the problem. I am not able to reproduce this yet. It would help if you can figure out how to reproduce this crash.

[Aerylia]

It happens to me all the time, on my Macbook, not on Windows.

[jvdwetering]

I think @akissinger also had random crashes when on his mac.

[akissinger]

I was getting random crashes in Linux. It seemed to be somewhat sensitive to my Qt6/pyside version, but I never was able to pinpoint it

[dlyongemallo]

I believe this is due to a race condition where something is being used before it's initialised, due to a signal being delayed (which varies based on the OS and other factors). There's some code that's implicitly assuming a callback/slot is called before it actually has been.

Something like this is the cause of issue #120 as well. Unfortunately, these bugs are difficult to reproduce, because running a debugger/profiler alters the nature of the timings. (The term for such bugs is "Heisenbug"!)

Sometimes one can reason about the cause if one thinks carefully about the code logic. The error index 6 beyond bounds [0 .. 5] suggests that something had 6 items and that one item had been added to it, but an attempt was made to use that item before it was fully initialised. Since you say you were clicking on a list of rules, I would guess that you performed an operation that added a rule to a list of 6 existing ones, and then clicked on something that referenced the 7th rule before the data structures for it were fully initialised. It would be helpful to have more information about what exactly you were doing leading up to the crash.