https://bugs.kde.org/show_bug.cgi?id=511437
Bug ID: 511437
Summary: Labplot crashes instantly with a Segmentation fault
when attempting to change a plot's axis scale from
"Linear" to "Log10" or any other value. The crash
occurs immediately upon clicking the new scale type in
the dropdown menu.
Classification: Applications
Product: LabPlot2
Version First 2.12.1
Reported In:
Platform: macOS (DMG)
OS: macOS
Status: REPORTED
Severity: crash
Priority: NOR
Component: backend
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Labplot crashes instantly with a `Segmentation fault` when attempting to change
a plot's axis scale from "Linear" to "Log10" or any other value. The crash
occurs immediately upon clicking the new scale type in the dropdown menu.
1. Application and System Details
* Application: Labplot
* Version: 2.12.0 (from crash log)
* Operating System: macOS 14.2.1 (23C71)
* Architecture: ARM-64 (Apple Silicon)
-----
2. Steps to Reproduce
1. Launch Labplot on macOS.
2. Create a new spreadsheet.
3. Copy a column of X-values from an external source (e.g., Excel) and paste
them into a spreadsheet column.
4. Copy a column of Y-values and paste them into another spreadsheet column.
5. Create a plot from these two columns.
6. Go to the plot's properties/settings area.
7. Locate the X-axis or Y-axis scale settings.
8. Untick the "Auto" setting for the scale.
9. Click the dropdown menu that currently shows "Linear".
10. Click on any other scale option (e.g., "Log10").
-----
3. Expected Behavior
The plot's axis scale should change to the newly selected option (e.g., Log10),
and the plot should update.
-----
4. Actual Behavior
The Labplot application crashes instantly and closes. This behavior is 100%
reproducible.
-----
5. Crash Details and Backtrace
The crash is an `EXC_BAD_ACCESS (SIGSEGV)` due to a `KERN_INVALID_ADDRESS at
0x0000000000000008`. This suggests the code is trying to access data from a
null pointer (specifically, at an offset of 8 bytes from address 0).
The crash happens in the main thread while processing events related to the
`QComboBox` (the dropdown menu).
Backtrace (Thread 0 Crashed)
```
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 QtWidgets 0x104102f40 0x103e74000 + 2682688
1 libqcocoa.dylib 0x100cfdffc 0x100c7c000 + 532476
2 AppKit 0x1855454f8
__NSAccessibilityEntryPointIsAccessibilityElement_block_invoke + 424
3 AppKit 0x18554530c
NSAccessibilityPerformEntryPointBOOL + 44
4 AppKit 0x184f5b63c
NSAccessibilityEntryPointIsAccessibilityElement + 140
5 AppKit 0x18504c9dc
NSAccessibilityUnignoredAncestor + 24
6 AppKit 0x1859950b0
-[NSWindow(NSWindowAccessibility) accessibilityFocusedUIElement] + 88
7 AppKit 0x184fb0770
NSAccessibilityHandleFocusChangedForce + 136
8 AppKit 0x184fcfcc8 -[NSWindow
_realMakeFirstResponder:] + 724
9 libqcocoa.dylib 0x100cbc370 0x100c7c000 + 263024
10 libqcocoa.dylib 0x100cbc5f4 0x100c7c000 + 263668
11 QtGui 0x104bcfe08 QWindowPrivate::destroy() + 196
12 QtWidgets 0x103eeb860 0x103e74000 + 489568
13 QtWidgets 0x103eeb980 0x103e74000 + 489856
14 QtWidgets 0x103ec3a1c QWidget::destroy(bool, bool) +
664
15 QtWidgets 0x103ec307c QWidget::~QWidget() + 1172
16 QtWidgets 0x103fa59ac
QComboBoxPrivateContainer::~QComboBoxPrivateContainer() + 140
17 QtWidgets 0x103fa8ddc QComboBox::~QComboBox() + 140
18 labplot 0x10017ebc4 0x100004000 + 1551300
19 QtCore 0x10454b190 QObject::event(QEvent*) + 696
20 QtWidgets 0x103ed5d3c QWidget::event(QEvent*) + 3236
21 QtWidgets 0x103fad35c QComboBox::event(QEvent*) + 352
22 QtWidgets 0x103e8389c
QApplicationPrivate::notify_helper(QObject*, QEvent*) + 336
23 QtWidgets 0x103e8531c QApplication::notify(QObject*,
QEvent*) + 3260
24 QtCore 0x104503ff8
QCoreApplication::notifyInternal2(QObject*, QEvent*) + 200
25 QtCore 0x104505104
QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) + 532
26 libqcocoa.dylib 0x100c94fa4 0x100c7c000 + 102308
27 libqcocoa.dylib 0x100c961f0 0x100c7c000 + 106992
28 CoreFoundation 0x181703a4c
__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28
29 CoreFoundation 0x1817039e0 __CFRunLoopDoSource0 + 176
30 CoreFoundation 0x181703750 __CFRunLoopDoSources0 + 244
31 CoreFoundation 0x181702340 __CFRunLoopRun + 828
32 CoreFoundation 0x1817019ac CFRunLoopRunSpecific + 608
33 HIToolbox 0x18bcb0448 RunCurrentEventLoopInMode + 292
34 HIToolbox 0x18bcb00d8 ReceiveNextEventCommon + 220
35 HIToolbox 0x18bcaffdc
_BlockUntilNextEventMatchingListInModeWithFilter + 76
36 AppKit 0x184ede8a4 _DPSNextEvent + 660
37 AppKit 0x1856b8980 -[NSApplication(NSEventRouting)
_nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 716
38 AppKit 0x184ed1d50 -[NSApplication run] + 476
39 libqcocoa.dylib 0x100c93adc 0x100c7c000 + 96988
40 QtCore 0x10450dfe0
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 596
41 QtCore 0x1045047d4 QCoreApplication::exec() + 144
42 labplot 0x10001bbb4 0x100004000 + 97204
43 dyld 0x1812a50e0 start + 2360
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