After running the Simulate button on the FSRS desired retention simulator, it thinks for a bit before crashing with a fatal error, which leads to a segfault.
It gives me the error “Error: 404: Invalid path: _anki/latestProgress”, with the following traceback:
Anki 26.05 (e64c6b1a) (ao)Python 3.13.11 Qt 6.11.0 PyQt 6.11.0Platform: macOS-15.7.3-arm64-arm-64bit-Mach-O
Traceback (most recent call last):File "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/aqt/progress.py", line 121, in handlerFile "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/aqt/main.py", line 1578, in on_periodic_backup_timerFile "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/aqt/main.py", line 1629, in _create_backup_with_progressFile "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/aqt/operations/init.py", line 263, in run_in_backgroundFile "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/aqt/operations/init.py", line 281, in _runFile "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/aqt/taskman.py", line 113, in with_progressFile "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/aqt/taskman.py", line 71, in run_in_backgroundFile "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/aqt/taskman.py", line 148, in _on_closures_pendingFile "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/aqt/taskman.py", line 88, in File "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/aqt/operations/init.py", line 259, in wrapped_doneFile "/Applications/Anki.app/Contents/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/_base.py", line 449, in resultreturn self.__get_result()~~~~~~~~~~~~~~~~~^^File "/Applications/Anki.app/Contents/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/_base.py", line 401, in __get_resultraise self._exceptionFile "/Applications/Anki.app/Contents/Frameworks/Python.framework/Versions/3.13/lib/python3.13/concurrent/futures/thread.py", line 59, in runresult = self.fn(*self.args, **self.kwargs)File "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/aqt/operations/init.py", line 243, in wrapped_opFile "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/aqt/deckbrowser.py", line 163, in get_dataFile "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/anki/scheduler/base.py", line 79, in deck_due_treeFile "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/anki/_backend_generated.py", line 386, in deck_treeFile "/Users/runner/work/anki/anki/out/installer/build/anki/macos/app/Anki.app/Contents/Resources/app_packages/anki/_backend.py", line 162, in _run_commandpyo3_runtime.PanicException: called Result::unwrap() on an Err value: PoisonError { .. }
This is followed by a SIGSEGV:
-------------------------------------
Translated Report (Full Report Below)
-------------------------------------
Process: Anki [3090]
Path: /Applications/Anki.app/Contents/MacOS/Anki
Identifier: net.ankiweb.anki
Version: 26.5 (1)
Code Type: ARM-64 (Native)
Parent Process: launchd [1]
User ID: 501
Date/Time: 2026-07-09 12:19:55.3782 -0400
OS Version: macOS 15.7.3 (24G419)
Report Version: 12
Anonymous UUID: 6DA7E170-71BD-1CB8-49FB-9A0C14D599B9
Sleep/Wake UUID: 45F88728-0998-4720-908C-F82CC60E21BD
Time Awake Since Boot: 1300000 seconds
Time Since Wake: 1735 seconds
System Integrity Protection: enabled
Crashed Thread: 0 CrBrowserMain Dispatch queue: com.apple.main-thread
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000010
Exception Codes: 0x0000000000000001, 0x0000000000000010
Termination Reason: Namespace SIGNAL, Code 11 Segmentation fault: 11
Terminating Process: exc handler [3090]
VM Region Info: 0x10 is not in any region. Bytes before following region: 4369203184
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
UNUSED SPACE AT START
--->
__TEXT 1046cc000-1046d0000 [ 16K] r-x/r-x SM=COW /Applications/Anki.app/Contents/MacOS/Anki
Thread 0 Crashed:: CrBrowserMain Dispatch queue: com.apple.main-thread
0 QtWebEngineCore 0x14d9fb500 QWebEnginePage::setVisible(bool) + 20
1 QtWebEngineWidgets.abi3.so 0x108f06794 sipQWebEngineView::hideEvent(QHideEvent*) + 148
2 QtWidgets 0x10bc13eb8 QWidget::event(QEvent*) + 132
3 QtWebEngineWidgets.abi3.so 0x108f04f3c sipQWebEngineView::event(QEvent*) + 224
4 QtWidgets 0x10bbc51a8 QApplicationPrivate::notify_helper(QObject*, QEvent*) + 332
5 QtWidgets 0x10bbc6d98 QApplication::notify(QObject*, QEvent*) + 3484
6 QtWidgets.abi3.so 0x10cd44038 sipQApplication::notify(QObject*, QEvent*) + 248
7 QtCore 0x1099ada08 QCoreApplication::sendEvent(QObject*, QEvent*) + 172
8 QtWidgets 0x10bc12cd4 QWidgetPrivate::hideChildren(bool) + 1140
9 QtWidgets 0x10bc12c98 QWidgetPrivate::hideChildren(bool) + 1080
10 QtWidgets 0x10bc12758 QWidgetPrivate::hide_helper() + 288
11 QtWidgets 0x10bc137b0 QWidgetPrivate::setVisible(bool) + 984
12 QtWidgets 0x10bc13148 QWidget::setVisible(bool) + 792
13 QtWidgets 0x10bc13cc0 QWidgetPrivate::handleClose(QWidgetPrivate::CloseMode) + 488
14 QtWidgets 0x10bc2cb88 0x10bbb8000 + 478088
15 QtGui 0x10c4b9d88 QWindow::event(QEvent*) + 528
16 QtWidgets 0x10bbc51a8 QApplicationPrivate::notify_helper(QObject*, QEvent*) + 332
17 QtWidgets 0x10bbc6200 QApplication::notify(QObject*, QEvent*) + 516
18 QtWidgets.abi3.so 0x10cd44038 sipQApplication::notify(QObject*, QEvent*) + 248
19 QtCore 0x1099adb34 QCoreApplication::sendSpontaneousEvent(QObject*, QEvent*) + 176
20 QtGui 0x10c45ce30 QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) + 2444
21 QtGui 0x10c4c8434 0x10c3cc000 + 1033268
22 QtGui 0x10c4b8ff4 QWindow::close() + 132
23 QtWidgets 0x10bc01668 QWidget::~QWidget() + 932
24 QtWidgets.abi3.so 0x10cc8e550 sipQMainWindow::~sipQMainWindow() + 64
25 QtCore.abi3.so 0x1090a7d6c cleanup_qobject(_sipSimpleWrapper*, void*) + 224
26 sip.cpython-313-darwin.so 0x108b5e874 sip_api_visit_wrappers + 100
27 QtCore.abi3.so 0x1090a7618 cleanup_on_exit(_object*, _object*) + 16
28 Python 0x10598b094 cfunction_vectorcall_NOARGS + 100
29 Python 0x105b8b7f4 atexit_callfuncs + 128
30 Python 0x105b54bec _Py_Finalize + 180
31 Python 0x105b59338 Py_Exit + 64
32 Python 0x105b5dd44 _PyErr_PrintEx + 76
33 QtCore.abi3.so 0x1090a7e00 pyqt6_err_print() + 128
34 QtCore.abi3.so 0x1090b0298 PyQtSlotProxy::unislot(void**) + 112
35 QtCore.abi3.so 0x1090b01f4 PyQtSlotProxy::qt_metacall(QMetaObject::Call, int, void**) + 68
36 QtCore 0x109a026b8 0x109910000 + 992952
37 QtCore 0x109a15f80 QTimer::timerEvent(QTimerEvent*) + 204
38 QtCore.abi3.so 0x108f77660 sipQTimer::timerEvent(QTimerEvent*) + 148
39 QtCore 0x1099f9d54 QObject::event(QEvent*) + 104
40 QtCore.abi3.so 0x108f774ac sipQTimer::event(QEvent*) + 220
41 QtWidgets 0x10bbc51a8 QApplicationPrivate::notify_helper(QObject*, QEvent*) + 332
42 QtWidgets 0x10bbc6200 QApplication::notify(QObject*, QEvent*) + 516
43 QtWidgets.abi3.so 0x10cd44038 sipQApplication::notify(QObject*, QEvent*) + 248
44 QtCore 0x1099ada08 QCoreApplication::sendEvent(QObject*, QEvent*) + 172
45 QtCore 0x109b5b284 QTimerInfoList::activateTimers() + 1268
46 libqcocoa.dylib 0x10e4bf8a8 0x10e4a8000 + 96424
47 CoreFoundation 0x19105ea64 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28
48 CoreFoundation 0x19105e9f8 __CFRunLoopDoSource0 + 172
49 CoreFoundation 0x19105e764 __CFRunLoopDoSources0 + 232
50 CoreFoundation 0x19105d3b8 __CFRunLoopRun + 840
51 CoreFoundation 0x19105c9e8 CFRunLoopRunSpecific + 572
52 HIToolbox 0x19cafd27c RunCurrentEventLoopInMode + 324
53 HIToolbox 0x19cb004e8 ReceiveNextEventCommon + 676
54 HIToolbox 0x19cc8b484 _BlockUntilNextEventMatchingListInModeWithFilter + 76
55 AppKit 0x194f7da34 _DPSNextEvent + 684
56 AppKit 0x19591c940 -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 688
57 libqcocoa.dylib 0x10e4c04e0 0x10e4a8000 + 99552
58 QtCore 0x1099b70f8 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 588
59 QtCore 0x1099ad700 QCoreApplication::exec() + 228
60 QtWidgets.abi3.so 0x10ce4eb64 meth_QApplication_exec(_object*, _object*) + 96
61 Python 0x10598a384 cfunction_call + 116
62 Python 0x105ab19b8 _PyEval_EvalFrameDefault + 40016
63 Python 0x105aa53a8 PyEval_EvalCode + 132
64 Python 0x105a9f0f0 builtin_exec + 396
65 Python 0x10598afdc cfunction_vectorcall_FASTCALL_KEYWORDS + 88
66 Python 0x105ab1664 _PyEval_EvalFrameDefault + 39164
67 Anki 0x1046cd3d8 main + 2328
68 dyld 0x190bd2b98 start + 6076
That report is truncated, if you need something else from it, let me know.
As an aside, this forum is not good for bug reports. I tried to see if this bug was reported, but I can’t even tell what is a closed bug and what isn’t!