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Details

Type: Bug
Resolution: Done
Priority: P1: Critical
Fix Version/s: 5.4.0 Beta, 5.4.0 RC, 5.4.0
Affects Version/s: 5.3.2, 5.4.0 Alpha
Component/s: Widgets: Widgets and Dialogs
Labels:
None
Environment:
OS X 10.8.5

Platform/s:

macOS
Commits:
2b4cda3852cf92fdff3ce4956f8752a99e44cf56

Description

We have been getting crashes with QFileDialog in our application. Debugging shows that sometimes we get a zombie NSBitmapGraphicsContext, and the application is crashing with a stack trace like this:

0	objc_msgSend	objc_msgSend		0x7fff898b3250	
1	+[NSGraphicsContext currentContextDrawingToScreen]	+[NSGraphicsContext currentContextDrawingToScreen]		0x7fff8a0fbdea	
2	-[NSView(NSInternal) _ancestorForStartOfDisplayRecursion]	-[NSView(NSInternal) _ancestorForStartOfDisplayRecursion]		0x7fff8a12e68a	
3	-[NSView displayIfNeeded]	-[NSView displayIfNeeded]		0x7fff8a0fb5e1	
4	_handleWindowNeedsDisplayOrLayoutOrUpdateConstraints	_handleWindowNeedsDisplayOrLayoutOrUpdateConstraints		0x7fff8a0fb1cc	
5	__83-[NSWindow _postWindowNeedsDisplayOrLayoutOrUpdateConstraintsUnlessPostingDisabled]_block_invoke_01208	__83-[NSWindow _postWindowNeedsDisplayOrLayoutOrUpdateConstraintsUnlessPostingDisabled]_block_invoke_01208		0x7fff8a6c6901	
6	__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__	__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__		0x7fff8d7cb417	
7	__CFRunLoopDoObservers	__CFRunLoopDoObservers		0x7fff8d7cb381	
8	__CFRunLoopRun	__CFRunLoopRun		0x7fff8d7a67b8	
9	CFRunLoopRunSpecific	CFRunLoopRunSpecific		0x7fff8d7a60e2	
10	RunCurrentEventLoopInMode	RunCurrentEventLoopInMode		0x7fff8bca7eb4	
11	ReceiveNextEventCommon	ReceiveNextEventCommon		0x7fff8bca7c52	
12	BlockUntilNextEventMatchingListInMode	BlockUntilNextEventMatchingListInMode		0x7fff8bca7ae3	
13	_DPSNextEvent	_DPSNextEvent		0x7fff8a0f8533	
14	-[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:]	-[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:]		0x7fff8a0f7df2	
15	-[NSApplication _realDoModalLoop:peek:]	-[NSApplication _realDoModalLoop:peek:]		0x7fff8a342659	
16	-[NSApplication runModalForWindow:]	-[NSApplication runModalForWindow:]		0x7fff8a34291e	
17	-[NSSavePanel runModal]	-[NSSavePanel runModal]		0x7fff8a58dd46	
18	-[QNSOpenSavePanelDelegate runApplicationModalPanel]	qcocoafiledialoghelper.mm	256	0x100b2d1dc	
19	QCocoaFileDialogHelper::exec()	qcocoafiledialoghelper.mm	769	0x100b3193c

The attached project, BadGraphicsContext, shows the problem.
Press the button to open the file dialog.
Make sure it is in the mode that shows the preview area on the right.
Move into another folder and find a file that has a preview.
It will probably crash.