Details
Description
When setting up a drag involving URL MIME data, a crash can be provoked when the system pasteboard is forced to resolve its promises.
One way of invoking this crash, involves having Apple's own Clipboard Viewer.app in order to force resolution of pasteboard contents. Another way is to have e.g. the desktop/clipboard sharing application Synergy.
Clipboard Viewer is available as part of Auxiliary Tools for Xcode 7.
1. Run the attached Qt Quick app
2. Initiate a drag of a URL (no need to drop it anywhere specific).
3. Switch to Clipboard Viewer and select the Drag Clipboard for viewing
4. Select e.g. public.file-url or refresh and observe the crash
Sample stack trace :
Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 com.apple.CoreFoundation 0x00007fff93a688c2 CFPasteboardGetGenerationCount + 66 1 com.apple.HIServices 0x00007fff8eb73679 IndexToItem(OpaquePasteboardRef*, long) + 30 2 com.apple.HIServices 0x00007fff8eb964a0 PasteboardCopyDataProc(void*, __CFPasteboard*, long, long, __CFString const*) + 190 3 com.apple.CoreFoundation 0x00007fff93b0fc04 __CFPasteboardClientCallBack + 1364 4 com.apple.CoreFoundation 0x00007fff93aeb628 __CFMessagePortPerform + 584 5 com.apple.CoreFoundation 0x00007fff93a53019 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41 6 com.apple.CoreFoundation 0x00007fff93a52f89 __CFRunLoopDoSource1 + 473 7 com.apple.CoreFoundation 0x00007fff93a4a9bb __CFRunLoopRun + 2171 8 com.apple.CoreFoundation 0x00007fff93a49ed8 CFRunLoopRunSpecific + 296 9 com.apple.HIToolbox 0x00007fff898ef935 RunCurrentEventLoopInMode + 235 10 com.apple.HIToolbox 0x00007fff898ef76f ReceiveNextEventCommon + 432 11 com.apple.HIToolbox 0x00007fff898ef5af _BlockUntilNextEventMatchingListInModeWithFilter + 71 12 com.apple.AppKit 0x00007fff844d1df6 _DPSNextEvent + 1067 13 com.apple.AppKit 0x00007fff844d1226 -[NSApplication _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 454 14 com.apple.AppKit 0x00007fff844c5d80 -[NSApplication run] + 682 15 libqcocoa.dylib 0x000000010b4f908d QCocoaEventDispatcher::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 2189 16 org.qt-project.QtCore 0x000000010a7c707d QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 381 17 org.qt-project.QtCore 0x000000010a7c9f5a QCoreApplication::exec() + 346 18 com.surething.drag-n-drop 0x0000000109baf9fd main + 205 (main.cpp:19) 19 com.surething.drag-n-drop 0x0000000109bab694 start + 52
Attachments
Issue Links
- is duplicated by
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QTBUG-54832 [macOS] crash on exit after drag-n-drop
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- Closed
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- relates to
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QTBUG-76263 Support lazy requests in QMacPasteboard::setMimeData
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- Closed
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