cocoa@apple-dev.groups.io | Canceling NSSavePanel Hang App

Sandor Szatmari

﻿Ran into an interesting issue today…
     Mac app
     Xcode 9.4.1, 32bit, 10.12 SDK, 10.6 Deployment Target
     non-sandboxed app

I am opening an NSSavePanel to allow a user to save the results of a report that is to be generated.

// Creating the save panel
   NSSavePanel* savePanel = [NSSavePanel savePanel];
  [savePanel setTitle:[NSString stringWithFormat:@"Export %@ Summary Data for %@", [self selectedReport], customerName]];

Opening the NSSavePanel using -runModal
  savePanelUserAction = [savePanel runModal];

If the user enters a filename and clicks continue the save dialog closes, the report is generated, and the file is written to disk at the selected location.
  if (savePanelUserAction == NSFileHandlingPanelOKButton)
     [NSThread detachNewThreadSelector:@selector(createSummary:) toTarget:self withObject:[[savePanel URL] path]];

If the user clicks cancel, the program hangs.  It hangs so badly that I have to go to the System Force-Quit dialog in order to fully terminate the app.
(i.e. Clicking stop program in Xcode does not fully terminate the app)
  else
  {
     // Program hangs
  }

I have checked that the NSSavePanel is being opened from the main thread.
I have included interesting backtraces below that are present if I stop the app in the de

Sandor

Thread 1 Queue : com.apple.main-thread (serial)
#0    0xa73d423e in kevent_id ()
#1    0x003305a6 in _dispatch_kq_poll ()
#2    0x00331141 in _dispatch_event_loop_wait_for_ownership ()
#3    0x00327b80 in _dispatch_sync_wait ()
#4    0x0031d500 in _dispatch_sync_f_slow ()
#5    0x0030f6d1 in dispatch_barrier_sync_f ()
#6    0x00316bf3 in dispatch_barrier_sync ()
#7    0x9387ebd4 in _VolumeObserverInvalidate ()
#8    0xa04ee78e in TSystemNotificationTask::~TSystemNotificationTask() ()
#9    0xa04ee818 in TSystemNotificationTask::FinalizeSystemNotificationTask() ()
#10    0xa04dda71 in NodeContextClose ()
#11    0x0afc689a in TFENode::Finalize() ()
#12    0x0b127290 in +[FIFinderViewGutsController finalizeCounted] ()
#13    0x0b127366 in __45+[FIFinderViewGutsController finalizeCounted]_block_invoke ()
#14    0x003167af in _dispatch_call_block_and_release ()
#15    0x0030e94d in _dispatch_client_callout ()
#16    0x0031ae6c in _dispatch_main_queue_callback_4CF ()
#17    0x937bb2ae in __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ ()
#18    0x9377ecf4 in __CFRunLoopRun ()
#19    0x9377dbd1 in CFRunLoopRunSpecific ()
#20    0x9377d93a in CFRunLoopRunInMode ()
#21    0x92d7b37b in RunCurrentEventLoopInMode ()
#22    0x92d7b0a2 in ReceiveNextEventCommon ()
#23    0x92d7ad7b in _BlockUntilNextEventMatchingListInModeWithFilter ()
#24    0x9137aafd in _DPSNextEvent ()
#25    0x91aece90 in -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] ()
#26    0x91aec35d in -[NSApplication(NSEvent) nextEventMatchingMask:untilDate:inMode:dequeue:] ()
#27    0x9136fa4d in -[NSApplication run] ()
#28    0x91341b0a in NSApplicationMain ()
#29    0x000026bc in main at /Users/username/repo/AppName/main.m:13
#30    0x00002685 in start ()
Enqueued from TBrowserViewDataSource (Thread 14) Queue : TBrowserViewDataSource (serial)
#0    0x0033f4dc in _dispatch_introspection_queue_item_enqueue ()
#1    0x00325cf8 in _dispatch_queue_push ()
#2    0x00323230 in _dispatch_continuation_push ()
#3    0x0032259b in _dispatch_continuation_async ()
#4    0x00316173 in dispatch_async ()
#5    0x0b1272f6 in +[FIFinderViewGutsController finalizeCounted] ()
#6    0x0b1aa3af in -[FI_TBrowserViewDataSource dealloc] ()
#7    0xa67a09f9 in objc_object::sidetable_release(bool) ()
#8    0xa679e2d0 in -[NSObject release] ()
#9    0x0b1aa762 in __destroy_helper_block_ ()
#10    0xa72c6b75 in _Block_release ()
#11    0x0030e94d in _dispatch_client_callout ()
#12    0x00324d3a in _dispatch_queue_serial_drain ()
#13    0x003162e2 in _dispatch_queue_invoke ()
#14    0x0032646e in _dispatch_root_queue_drain_deferred_wlh ()
#15    0x0032b4bb in _dispatch_workloop_worker_thread ()
#16    0x00381601 in _pthread_wqthread ()
#17    0x0038121e in start_wqthread ()
Enqueued from com.apple.main-thread (Thread 1) Queue : com.apple.main-thread (serial)
#0    0x0033f4dc in _dispatch_introspection_queue_item_enqueue ()
#1    0x00325cf8 in _dispatch_queue_push ()
#2    0x00323230 in _dispatch_continuation_push ()
#3    0x0032259b in _dispatch_continuation_async ()
#4    0x00316173 in dispatch_async ()
#5    0x0b1aa460 in -[FI_TBrowserViewDataSource aboutToTearDown] ()
#6    0x0b1e0aa5 in -[FI_TBrowserContainerController destroyBrowserView:] ()
#7    0x0b1e3ed4 in -[FIContainerController destroyBrowserView:] ()
#8    0x0b1e06c6 in -[FI_TBrowserContainerController aboutToTearDown] ()
#9    0x0b1e3f3b in -[FIContainerController aboutToTearDown] ()
#10    0xa67a0bda in -[NSObject performSelector:] ()
#11    0x0b042f47 in AboutToTearDownViewController(NSViewController*) ()
#12    0x0b07a83c in -[FI_TBrowserContentViewController aboutToTearDown] ()
#13    0xa67a0bda in -[NSObject performSelector:] ()
#14    0x0b042f47 in AboutToTearDownViewController(NSViewController*) ()
#15    0x0b1293f0 in -[FIFinderViewGutsController prepareToHide] ()
#16    0x0b12996f in -[FIFinderViewGutsController windowOrderedOut] ()
#17    0x0b13486f in -[FIFinderView windowOrderedOut] ()
#18    0x91e3ffe5 in -[NSNavFinderViewFileBrowser windowOrderedOut] ()
#19    0x91a4df5e in -[NSSavePanel _navViewWindowOrderedOut] ()
#20    0x91a4dfc5 in -[NSSavePanel orderOut:] ()
#21    0x91a5bffa in -[NSSavePanel _didEndSheet:returnCode:contextInfo:] ()
#22    0x91c27b17 in NSWindowEndWindowModalSession ()
#23    0x915acaf6 in -[NSWindow _endWindowBlockingModalSession:returnCode:] ()
#24    0x915aca86 in -[NSWindow endSheet:returnCode:] ()
#25    0x915f7367 in -[NSApplication endSheet:returnCode:] ()
#26    0x91a5e2cb in -[NSSavePanel _dismissWindowWithReturnCode:willRunSeamlessOpening:] ()
#27    0x91a5e2f1 in -[NSSavePanel _cancelAndClose] ()
#28    0x91a5e933 in -[NSSavePanel cancel:] ()
#29    0xa67a0c1c in -[NSObject performSelector:withObject:] ()
#30    0x91aeeca9 in __49-[NSApplication(NSResponder) sendAction:to:from:]_block_invoke ()
#31    0x91aeec4d in __NS_ACTIVITY_PERFORM_EXCEPTION_SAFE ()
#32    0x91aeeb4f in -[NSApplication(NSResponder) sendAction:to:from:] ()
#33    0x9159eda8 in -[NSControl sendAction:to:] ()
#34    0x9159ecc7 in __26-[NSCell _sendActionFrom:]_block_invoke ()
#35    0x917e5009 in __NS_ACTIVITY_PERFORM_EXCEPTION_SAFE ()
#36    0x9159ec11 in -[NSCell _sendActionFrom:] ()
#37    0x915dd6cb in -[NSButtonCell _sendActionFrom:] ()
#38    0x917e6e2c in __48-[NSCell trackMouse:inRect:ofView:untilMouseUp:]_block_invoke.1099 ()
#39    0x917e5009 in __NS_ACTIVITY_PERFORM_EXCEPTION_SAFE ()
#40    0x9159d58d in -[NSCell trackMouse:inRect:ofView:untilMouseUp:] ()
#41    0x915dd420 in -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] ()
#42    0x9159bff4 in -[NSControl mouseDown:] ()
#43    0x91c922b4 in -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] ()
#44    0x91c9024f in -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] ()
#45    0x91c8e4c0 in -[NSWindow(NSEventRouting) sendEvent:] ()
#46    0x91aeb2d5 in -[NSApplication(NSEvent) sendEvent:] ()
#47    0x9136fa98 in -[NSApplication run] ()
#48    0x91341b0a in NSApplicationMain ()
#49    0x000026bc in main at /Users/username/repo/AppName/main.m:13
#50    0x00002685 in start ()


// Other threads that seemed interesting, but could be misleading???

Thread 2 Queue : com.apple.CFVolumeObserver.0x6af670 (serial)
#0    0xa73d242a in __getattrlist ()
#1    0x9ffa770f in volumePropertyProviderPrepareValues(__CFURL const*, __FileCache*, __CFString const* const*, void const**, long, void const*, __CFError**) ()
#2    0x9ffa1ebd in prepareValuesForBitmap(__CFURL const*, __FileCache*, _FilePropertyBitmap*, __CFError**) ()
#3    0x9ff9f858 in _FSURLCopyResourcePropertyForKeyInternal(__CFURL const*, __CFString const*, void*, void*, __CFError**, unsigned char) ()
#4    0x9ff9f779 in _FSURLCopyResourcePropertyForKey ()
#5    0x93765cd0 in CFURLCopyResourcePropertyForKey ()
#6    0x937dfaf6 in _VolumeObserverDiskAppearedCallback ()
#7    0x9513f6ab in _DADispatchCallback ()
#8    0x9513f439 in _DASessionCallback ()
#9    0x9513f304 in __DASessionSetDispatchQueue_block_invoke_2 ()
#10    0x0030e94d in _dispatch_client_callout ()
#11    0x00323464 in _dispatch_continuation_pop ()
#12    0x00310eba in _dispatch_source_invoke ()
#13    0x00324b73 in _dispatch_queue_serial_drain ()
#14    0x003162e2 in _dispatch_queue_invoke ()
#15    0x0032646e in _dispatch_root_queue_drain_deferred_wlh ()
#16    0x0032b4bb in _dispatch_workloop_worker_thread ()
#17    0x00381601 in _pthread_wqthread ()
#18    0x0038121e in start_wqthread ()


Thread 10 Queue : com.apple.CFVolumeObserver.0x6ac5d0 (serial)
#0    0xa73d242a in __getattrlist ()
#1    0x9ffa770f in volumePropertyProviderPrepareValues(__CFURL const*, __FileCache*, __CFString const* const*, void const**, long, void const*, __CFError**) ()
#2    0x9ffa1ebd in prepareValuesForBitmap(__CFURL const*, __FileCache*, _FilePropertyBitmap*, __CFError**) ()
#3    0x9ff9f858 in _FSURLCopyResourcePropertyForKeyInternal(__CFURL const*, __CFString const*, void*, void*, __CFError**, unsigned char) ()
#4    0x9ff9f779 in _FSURLCopyResourcePropertyForKey ()
#5    0x93765cd0 in CFURLCopyResourcePropertyForKey ()
#6    0x937dfaf6 in _VolumeObserverDiskAppearedCallback ()
#7    0x9513f6ab in _DADispatchCallback ()
#8    0x9513f439 in _DASessionCallback ()
#9    0x9513f304 in __DASessionSetDispatchQueue_block_invoke_2 ()
#10    0x0030e94d in _dispatch_client_callout ()
#11    0x00323464 in _dispatch_continuation_pop ()
#12    0x00310eba in _dispatch_source_invoke ()
#13    0x00324b73 in _dispatch_queue_serial_drain ()
#14    0x003162e2 in _dispatch_queue_invoke ()
#15    0x0032646e in _dispatch_root_queue_drain_deferred_wlh ()
#16    0x0032b4bb in _dispatch_workloop_worker_thread ()
#17    0x00381601 in _pthread_wqthread ()
#18    0x0038121e in start_wqthread ()

Sandor Szatmari

#1209

Took a guess and enabled sandbox and added read/write to user selected file and the hang went away.  Is it true that I cannot make an unsandboxed app and uses the NSSavePanel?  I know this is a data point of one, so I want to be careful what conclusions I draw… any thoughts?

Can anyone shed light/point me in the right direction as to where to update my knowledge?

Sandor

Show quoted text

On Apr 1, 2020, at 17:31, Sandor Szatmari via groups.io <admin.szatmari.net@...> wrote:

﻿Ran into an interesting issue today…
    Mac app
    Xcode 9.4.1, 32bit, 10.12 SDK, 10.6 Deployment Target
    non-sandboxed app

I am opening an NSSavePanel to allow a user to save the results of a report that is to be generated.

// Creating the save panel
  NSSavePanel* savePanel = [NSSavePanel savePanel];
 [savePanel setTitle:[NSString stringWithFormat:@"Export %@ Summary Data for %@", [self selectedReport], customerName]];

Opening the NSSavePanel using -runModal
 savePanelUserAction = [savePanel runModal];

If the user enters a filename and clicks continue the save dialog closes, the report is generated, and the file is written to disk at the selected location.
 if (savePanelUserAction == NSFileHandlingPanelOKButton)
    [NSThread detachNewThreadSelector:@selector(createSummary:) toTarget:self withObject:[[savePanel URL] path]];

If the user clicks cancel, the program hangs.  It hangs so badly that I have to go to the System Force-Quit dialog in order to fully terminate the app.
(i.e. Clicking stop program in Xcode does not fully terminate the app)
 else
 {
    // Program hangs
 }

I have checked that the NSSavePanel is being opened from the main thread.
I have included interesting backtraces below that are present if I stop the app in the de

Sandor

Thread 1 Queue : com.apple.main-thread (serial)
#0    0xa73d423e in kevent_id ()
#1    0x003305a6 in _dispatch_kq_poll ()
#2    0x00331141 in _dispatch_event_loop_wait_for_ownership ()
#3    0x00327b80 in _dispatch_sync_wait ()
#4    0x0031d500 in _dispatch_sync_f_slow ()
#5    0x0030f6d1 in dispatch_barrier_sync_f ()
#6    0x00316bf3 in dispatch_barrier_sync ()
#7    0x9387ebd4 in _VolumeObserverInvalidate ()
#8    0xa04ee78e in TSystemNotificationTask::~TSystemNotificationTask() ()
#9    0xa04ee818 in TSystemNotificationTask::FinalizeSystemNotificationTask() ()
#10    0xa04dda71 in NodeContextClose ()
#11    0x0afc689a in TFENode::Finalize() ()
#12    0x0b127290 in +[FIFinderViewGutsController finalizeCounted] ()
#13    0x0b127366 in __45+[FIFinderViewGutsController finalizeCounted]_block_invoke ()
#14    0x003167af in _dispatch_call_block_and_release ()
#15    0x0030e94d in _dispatch_client_callout ()
#16    0x0031ae6c in _dispatch_main_queue_callback_4CF ()
#17    0x937bb2ae in __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ ()
#18    0x9377ecf4 in __CFRunLoopRun ()
#19    0x9377dbd1 in CFRunLoopRunSpecific ()
#20    0x9377d93a in CFRunLoopRunInMode ()
#21    0x92d7b37b in RunCurrentEventLoopInMode ()
#22    0x92d7b0a2 in ReceiveNextEventCommon ()
#23    0x92d7ad7b in _BlockUntilNextEventMatchingListInModeWithFilter ()
#24    0x9137aafd in _DPSNextEvent ()
#25    0x91aece90 in -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] ()
#26    0x91aec35d in -[NSApplication(NSEvent) nextEventMatchingMask:untilDate:inMode:dequeue:] ()
#27    0x9136fa4d in -[NSApplication run] ()
#28    0x91341b0a in NSApplicationMain ()
#29    0x000026bc in main at /Users/username/repo/AppName/main.m:13
#30    0x00002685 in start ()
Enqueued from TBrowserViewDataSource (Thread 14) Queue : TBrowserViewDataSource (serial)
#0    0x0033f4dc in _dispatch_introspection_queue_item_enqueue ()
#1    0x00325cf8 in _dispatch_queue_push ()
#2    0x00323230 in _dispatch_continuation_push ()
#3    0x0032259b in _dispatch_continuation_async ()
#4    0x00316173 in dispatch_async ()
#5    0x0b1272f6 in +[FIFinderViewGutsController finalizeCounted] ()
#6    0x0b1aa3af in -[FI_TBrowserViewDataSource dealloc] ()
#7    0xa67a09f9 in objc_object::sidetable_release(bool) ()
#8    0xa679e2d0 in -[NSObject release] ()
#9    0x0b1aa762 in __destroy_helper_block_ ()
#10    0xa72c6b75 in _Block_release ()
#11    0x0030e94d in _dispatch_client_callout ()
#12    0x00324d3a in _dispatch_queue_serial_drain ()
#13    0x003162e2 in _dispatch_queue_invoke ()
#14    0x0032646e in _dispatch_root_queue_drain_deferred_wlh ()
#15    0x0032b4bb in _dispatch_workloop_worker_thread ()
#16    0x00381601 in _pthread_wqthread ()
#17    0x0038121e in start_wqthread ()
Enqueued from com.apple.main-thread (Thread 1) Queue : com.apple.main-thread (serial)
#0    0x0033f4dc in _dispatch_introspection_queue_item_enqueue ()
#1    0x00325cf8 in _dispatch_queue_push ()
#2    0x00323230 in _dispatch_continuation_push ()
#3    0x0032259b in _dispatch_continuation_async ()
#4    0x00316173 in dispatch_async ()
#5    0x0b1aa460 in -[FI_TBrowserViewDataSource aboutToTearDown] ()
#6    0x0b1e0aa5 in -[FI_TBrowserContainerController destroyBrowserView:] ()
#7    0x0b1e3ed4 in -[FIContainerController destroyBrowserView:] ()
#8    0x0b1e06c6 in -[FI_TBrowserContainerController aboutToTearDown] ()
#9    0x0b1e3f3b in -[FIContainerController aboutToTearDown] ()
#10    0xa67a0bda in -[NSObject performSelector:] ()
#11    0x0b042f47 in AboutToTearDownViewController(NSViewController*) ()
#12    0x0b07a83c in -[FI_TBrowserContentViewController aboutToTearDown] ()
#13    0xa67a0bda in -[NSObject performSelector:] ()
#14    0x0b042f47 in AboutToTearDownViewController(NSViewController*) ()
#15    0x0b1293f0 in -[FIFinderViewGutsController prepareToHide] ()
#16    0x0b12996f in -[FIFinderViewGutsController windowOrderedOut] ()
#17    0x0b13486f in -[FIFinderView windowOrderedOut] ()
#18    0x91e3ffe5 in -[NSNavFinderViewFileBrowser windowOrderedOut] ()
#19    0x91a4df5e in -[NSSavePanel _navViewWindowOrderedOut] ()
#20    0x91a4dfc5 in -[NSSavePanel orderOut:] ()
#21    0x91a5bffa in -[NSSavePanel _didEndSheet:returnCode:contextInfo:] ()
#22    0x91c27b17 in NSWindowEndWindowModalSession ()
#23    0x915acaf6 in -[NSWindow _endWindowBlockingModalSession:returnCode:] ()
#24    0x915aca86 in -[NSWindow endSheet:returnCode:] ()
#25    0x915f7367 in -[NSApplication endSheet:returnCode:] ()
#26    0x91a5e2cb in -[NSSavePanel _dismissWindowWithReturnCode:willRunSeamlessOpening:] ()
#27    0x91a5e2f1 in -[NSSavePanel _cancelAndClose] ()
#28    0x91a5e933 in -[NSSavePanel cancel:] ()
#29    0xa67a0c1c in -[NSObject performSelector:withObject:] ()
#30    0x91aeeca9 in __49-[NSApplication(NSResponder) sendAction:to:from:]_block_invoke ()
#31    0x91aeec4d in __NS_ACTIVITY_PERFORM_EXCEPTION_SAFE ()
#32    0x91aeeb4f in -[NSApplication(NSResponder) sendAction:to:from:] ()
#33    0x9159eda8 in -[NSControl sendAction:to:] ()
#34    0x9159ecc7 in __26-[NSCell _sendActionFrom:]_block_invoke ()
#35    0x917e5009 in __NS_ACTIVITY_PERFORM_EXCEPTION_SAFE ()
#36    0x9159ec11 in -[NSCell _sendActionFrom:] ()
#37    0x915dd6cb in -[NSButtonCell _sendActionFrom:] ()
#38    0x917e6e2c in __48-[NSCell trackMouse:inRect:ofView:untilMouseUp:]_block_invoke.1099 ()
#39    0x917e5009 in __NS_ACTIVITY_PERFORM_EXCEPTION_SAFE ()
#40    0x9159d58d in -[NSCell trackMouse:inRect:ofView:untilMouseUp:] ()
#41    0x915dd420 in -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] ()
#42    0x9159bff4 in -[NSControl mouseDown:] ()
#43    0x91c922b4 in -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] ()
#44    0x91c9024f in -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] ()
#45    0x91c8e4c0 in -[NSWindow(NSEventRouting) sendEvent:] ()
#46    0x91aeb2d5 in -[NSApplication(NSEvent) sendEvent:] ()
#47    0x9136fa98 in -[NSApplication run] ()
#48    0x91341b0a in NSApplicationMain ()
#49    0x000026bc in main at /Users/username/repo/AppName/main.m:13
#50    0x00002685 in start ()


// Other threads that seemed interesting, but could be misleading???

Thread 2 Queue : com.apple.CFVolumeObserver.0x6af670 (serial)
#0    0xa73d242a in __getattrlist ()
#1    0x9ffa770f in volumePropertyProviderPrepareValues(__CFURL const*, __FileCache*, __CFString const* const*, void const**, long, void const*, __CFError**) ()
#2    0x9ffa1ebd in prepareValuesForBitmap(__CFURL const*, __FileCache*, _FilePropertyBitmap*, __CFError**) ()
#3    0x9ff9f858 in _FSURLCopyResourcePropertyForKeyInternal(__CFURL const*, __CFString const*, void*, void*, __CFError**, unsigned char) ()
#4    0x9ff9f779 in _FSURLCopyResourcePropertyForKey ()
#5    0x93765cd0 in CFURLCopyResourcePropertyForKey ()
#6    0x937dfaf6 in _VolumeObserverDiskAppearedCallback ()
#7    0x9513f6ab in _DADispatchCallback ()
#8    0x9513f439 in _DASessionCallback ()
#9    0x9513f304 in __DASessionSetDispatchQueue_block_invoke_2 ()
#10    0x0030e94d in _dispatch_client_callout ()
#11    0x00323464 in _dispatch_continuation_pop ()
#12    0x00310eba in _dispatch_source_invoke ()
#13    0x00324b73 in _dispatch_queue_serial_drain ()
#14    0x003162e2 in _dispatch_queue_invoke ()
#15    0x0032646e in _dispatch_root_queue_drain_deferred_wlh ()
#16    0x0032b4bb in _dispatch_workloop_worker_thread ()
#17    0x00381601 in _pthread_wqthread ()
#18    0x0038121e in start_wqthread ()


Thread 10 Queue : com.apple.CFVolumeObserver.0x6ac5d0 (serial)
#0    0xa73d242a in __getattrlist ()
#1    0x9ffa770f in volumePropertyProviderPrepareValues(__CFURL const*, __FileCache*, __CFString const* const*, void const**, long, void const*, __CFError**) ()
#2    0x9ffa1ebd in prepareValuesForBitmap(__CFURL const*, __FileCache*, _FilePropertyBitmap*, __CFError**) ()
#3    0x9ff9f858 in _FSURLCopyResourcePropertyForKeyInternal(__CFURL const*, __CFString const*, void*, void*, __CFError**, unsigned char) ()
#4    0x9ff9f779 in _FSURLCopyResourcePropertyForKey ()
#5    0x93765cd0 in CFURLCopyResourcePropertyForKey ()
#6    0x937dfaf6 in _VolumeObserverDiskAppearedCallback ()
#7    0x9513f6ab in _DADispatchCallback ()
#8    0x9513f439 in _DASessionCallback ()
#9    0x9513f304 in __DASessionSetDispatchQueue_block_invoke_2 ()
#10    0x0030e94d in _dispatch_client_callout ()
#11    0x00323464 in _dispatch_continuation_pop ()
#12    0x00310eba in _dispatch_source_invoke ()
#13    0x00324b73 in _dispatch_queue_serial_drain ()
#14    0x003162e2 in _dispatch_queue_invoke ()
#15    0x0032646e in _dispatch_root_queue_drain_deferred_wlh ()
#16    0x0032b4bb in _dispatch_workloop_worker_thread ()
#17    0x00381601 in _pthread_wqthread ()
#18    0x0038121e in start_wqthread ()

Sandor Szatmari

#1210

Already reading app sandbox design guide, was hoping for pointers to other apple resources, videos, etc…

Thanks,
Sandor

Show quoted text

On Apr 2, 2020, at 13:54, Sandor Szatmari via groups.io <admin.szatmari.net@...> wrote:

﻿Took a guess and enabled sandbox and added read/write to user selected file and the hang went away.  Is it true that I cannot make an unsandboxed app and uses the NSSavePanel?  I know this is a data point of one, so I want to be careful what conclusions I draw… any thoughts?

Can anyone shed light/point me in the right direction as to where to update my knowledge?

Sandor

On Apr 1, 2020, at 17:31, Sandor Szatmari via groups.io <admin.szatmari.net@...> wrote:

﻿Ran into an interesting issue today…
   Mac app
   Xcode 9.4.1, 32bit, 10.12 SDK, 10.6 Deployment Target
   non-sandboxed app

I am opening an NSSavePanel to allow a user to save the results of a report that is to be generated.

// Creating the save panel
 NSSavePanel* savePanel = [NSSavePanel savePanel];
[savePanel setTitle:[NSString stringWithFormat:@"Export %@ Summary Data for %@", [self selectedReport], customerName]];

Opening the NSSavePanel using -runModal
savePanelUserAction = [savePanel runModal];

If the user enters a filename and clicks continue the save dialog closes, the report is generated, and the file is written to disk at the selected location.
if (savePanelUserAction == NSFileHandlingPanelOKButton)
   [NSThread detachNewThreadSelector:@selector(createSummary:) toTarget:self withObject:[[savePanel URL] path]];

If the user clicks cancel, the program hangs.  It hangs so badly that I have to go to the System Force-Quit dialog in order to fully terminate the app.
(i.e. Clicking stop program in Xcode does not fully terminate the app)
else
{
   // Program hangs
}

I have checked that the NSSavePanel is being opened from the main thread.
I have included interesting backtraces below that are present if I stop the app in the de

Sandor

Thread 1 Queue : com.apple.main-thread (serial)
#0    0xa73d423e in kevent_id ()
#1    0x003305a6 in _dispatch_kq_poll ()
#2    0x00331141 in _dispatch_event_loop_wait_for_ownership ()
#3    0x00327b80 in _dispatch_sync_wait ()
#4    0x0031d500 in _dispatch_sync_f_slow ()
#5    0x0030f6d1 in dispatch_barrier_sync_f ()
#6    0x00316bf3 in dispatch_barrier_sync ()
#7    0x9387ebd4 in _VolumeObserverInvalidate ()
#8    0xa04ee78e in TSystemNotificationTask::~TSystemNotificationTask() ()
#9    0xa04ee818 in TSystemNotificationTask::FinalizeSystemNotificationTask() ()
#10    0xa04dda71 in NodeContextClose ()
#11    0x0afc689a in TFENode::Finalize() ()
#12    0x0b127290 in +[FIFinderViewGutsController finalizeCounted] ()
#13    0x0b127366 in __45+[FIFinderViewGutsController finalizeCounted]_block_invoke ()
#14    0x003167af in _dispatch_call_block_and_release ()
#15    0x0030e94d in _dispatch_client_callout ()
#16    0x0031ae6c in _dispatch_main_queue_callback_4CF ()
#17    0x937bb2ae in __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ ()
#18    0x9377ecf4 in __CFRunLoopRun ()
#19    0x9377dbd1 in CFRunLoopRunSpecific ()
#20    0x9377d93a in CFRunLoopRunInMode ()
#21    0x92d7b37b in RunCurrentEventLoopInMode ()
#22    0x92d7b0a2 in ReceiveNextEventCommon ()
#23    0x92d7ad7b in _BlockUntilNextEventMatchingListInModeWithFilter ()
#24    0x9137aafd in _DPSNextEvent ()
#25    0x91aece90 in -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] ()
#26    0x91aec35d in -[NSApplication(NSEvent) nextEventMatchingMask:untilDate:inMode:dequeue:] ()
#27    0x9136fa4d in -[NSApplication run] ()
#28    0x91341b0a in NSApplicationMain ()
#29    0x000026bc in main at /Users/username/repo/AppName/main.m:13
#30    0x00002685 in start ()
Enqueued from TBrowserViewDataSource (Thread 14) Queue : TBrowserViewDataSource (serial)
#0    0x0033f4dc in _dispatch_introspection_queue_item_enqueue ()
#1    0x00325cf8 in _dispatch_queue_push ()
#2    0x00323230 in _dispatch_continuation_push ()
#3    0x0032259b in _dispatch_continuation_async ()
#4    0x00316173 in dispatch_async ()
#5    0x0b1272f6 in +[FIFinderViewGutsController finalizeCounted] ()
#6    0x0b1aa3af in -[FI_TBrowserViewDataSource dealloc] ()
#7    0xa67a09f9 in objc_object::sidetable_release(bool) ()
#8    0xa679e2d0 in -[NSObject release] ()
#9    0x0b1aa762 in __destroy_helper_block_ ()
#10    0xa72c6b75 in _Block_release ()
#11    0x0030e94d in _dispatch_client_callout ()
#12    0x00324d3a in _dispatch_queue_serial_drain ()
#13    0x003162e2 in _dispatch_queue_invoke ()
#14    0x0032646e in _dispatch_root_queue_drain_deferred_wlh ()
#15    0x0032b4bb in _dispatch_workloop_worker_thread ()
#16    0x00381601 in _pthread_wqthread ()
#17    0x0038121e in start_wqthread ()
Enqueued from com.apple.main-thread (Thread 1) Queue : com.apple.main-thread (serial)
#0    0x0033f4dc in _dispatch_introspection_queue_item_enqueue ()
#1    0x00325cf8 in _dispatch_queue_push ()
#2    0x00323230 in _dispatch_continuation_push ()
#3    0x0032259b in _dispatch_continuation_async ()
#4    0x00316173 in dispatch_async ()
#5    0x0b1aa460 in -[FI_TBrowserViewDataSource aboutToTearDown] ()
#6    0x0b1e0aa5 in -[FI_TBrowserContainerController destroyBrowserView:] ()
#7    0x0b1e3ed4 in -[FIContainerController destroyBrowserView:] ()
#8    0x0b1e06c6 in -[FI_TBrowserContainerController aboutToTearDown] ()
#9    0x0b1e3f3b in -[FIContainerController aboutToTearDown] ()
#10    0xa67a0bda in -[NSObject performSelector:] ()
#11    0x0b042f47 in AboutToTearDownViewController(NSViewController*) ()
#12    0x0b07a83c in -[FI_TBrowserContentViewController aboutToTearDown] ()
#13    0xa67a0bda in -[NSObject performSelector:] ()
#14    0x0b042f47 in AboutToTearDownViewController(NSViewController*) ()
#15    0x0b1293f0 in -[FIFinderViewGutsController prepareToHide] ()
#16    0x0b12996f in -[FIFinderViewGutsController windowOrderedOut] ()
#17    0x0b13486f in -[FIFinderView windowOrderedOut] ()
#18    0x91e3ffe5 in -[NSNavFinderViewFileBrowser windowOrderedOut] ()
#19    0x91a4df5e in -[NSSavePanel _navViewWindowOrderedOut] ()
#20    0x91a4dfc5 in -[NSSavePanel orderOut:] ()
#21    0x91a5bffa in -[NSSavePanel _didEndSheet:returnCode:contextInfo:] ()
#22    0x91c27b17 in NSWindowEndWindowModalSession ()
#23    0x915acaf6 in -[NSWindow _endWindowBlockingModalSession:returnCode:] ()
#24    0x915aca86 in -[NSWindow endSheet:returnCode:] ()
#25    0x915f7367 in -[NSApplication endSheet:returnCode:] ()
#26    0x91a5e2cb in -[NSSavePanel _dismissWindowWithReturnCode:willRunSeamlessOpening:] ()
#27    0x91a5e2f1 in -[NSSavePanel _cancelAndClose] ()
#28    0x91a5e933 in -[NSSavePanel cancel:] ()
#29    0xa67a0c1c in -[NSObject performSelector:withObject:] ()
#30    0x91aeeca9 in __49-[NSApplication(NSResponder) sendAction:to:from:]_block_invoke ()
#31    0x91aeec4d in __NS_ACTIVITY_PERFORM_EXCEPTION_SAFE ()
#32    0x91aeeb4f in -[NSApplication(NSResponder) sendAction:to:from:] ()
#33    0x9159eda8 in -[NSControl sendAction:to:] ()
#34    0x9159ecc7 in __26-[NSCell _sendActionFrom:]_block_invoke ()
#35    0x917e5009 in __NS_ACTIVITY_PERFORM_EXCEPTION_SAFE ()
#36    0x9159ec11 in -[NSCell _sendActionFrom:] ()
#37    0x915dd6cb in -[NSButtonCell _sendActionFrom:] ()
#38    0x917e6e2c in __48-[NSCell trackMouse:inRect:ofView:untilMouseUp:]_block_invoke.1099 ()
#39    0x917e5009 in __NS_ACTIVITY_PERFORM_EXCEPTION_SAFE ()
#40    0x9159d58d in -[NSCell trackMouse:inRect:ofView:untilMouseUp:] ()
#41    0x915dd420 in -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] ()
#42    0x9159bff4 in -[NSControl mouseDown:] ()
#43    0x91c922b4 in -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] ()
#44    0x91c9024f in -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] ()
#45    0x91c8e4c0 in -[NSWindow(NSEventRouting) sendEvent:] ()
#46    0x91aeb2d5 in -[NSApplication(NSEvent) sendEvent:] ()
#47    0x9136fa98 in -[NSApplication run] ()
#48    0x91341b0a in NSApplicationMain ()
#49    0x000026bc in main at /Users/username/repo/AppName/main.m:13
#50    0x00002685 in start ()


// Other threads that seemed interesting, but could be misleading???

Thread 2 Queue : com.apple.CFVolumeObserver.0x6af670 (serial)
#0    0xa73d242a in __getattrlist ()
#1    0x9ffa770f in volumePropertyProviderPrepareValues(__CFURL const*, __FileCache*, __CFString const* const*, void const**, long, void const*, __CFError**) ()
#2    0x9ffa1ebd in prepareValuesForBitmap(__CFURL const*, __FileCache*, _FilePropertyBitmap*, __CFError**) ()
#3    0x9ff9f858 in _FSURLCopyResourcePropertyForKeyInternal(__CFURL const*, __CFString const*, void*, void*, __CFError**, unsigned char) ()
#4    0x9ff9f779 in _FSURLCopyResourcePropertyForKey ()
#5    0x93765cd0 in CFURLCopyResourcePropertyForKey ()
#6    0x937dfaf6 in _VolumeObserverDiskAppearedCallback ()
#7    0x9513f6ab in _DADispatchCallback ()
#8    0x9513f439 in _DASessionCallback ()
#9    0x9513f304 in __DASessionSetDispatchQueue_block_invoke_2 ()
#10    0x0030e94d in _dispatch_client_callout ()
#11    0x00323464 in _dispatch_continuation_pop ()
#12    0x00310eba in _dispatch_source_invoke ()
#13    0x00324b73 in _dispatch_queue_serial_drain ()
#14    0x003162e2 in _dispatch_queue_invoke ()
#15    0x0032646e in _dispatch_root_queue_drain_deferred_wlh ()
#16    0x0032b4bb in _dispatch_workloop_worker_thread ()
#17    0x00381601 in _pthread_wqthread ()
#18    0x0038121e in start_wqthread ()


Thread 10 Queue : com.apple.CFVolumeObserver.0x6ac5d0 (serial)
#0    0xa73d242a in __getattrlist ()
#1    0x9ffa770f in volumePropertyProviderPrepareValues(__CFURL const*, __FileCache*, __CFString const* const*, void const**, long, void const*, __CFError**) ()
#2    0x9ffa1ebd in prepareValuesForBitmap(__CFURL const*, __FileCache*, _FilePropertyBitmap*, __CFError**) ()
#3    0x9ff9f858 in _FSURLCopyResourcePropertyForKeyInternal(__CFURL const*, __CFString const*, void*, void*, __CFError**, unsigned char) ()
#4    0x9ff9f779 in _FSURLCopyResourcePropertyForKey ()
#5    0x93765cd0 in CFURLCopyResourcePropertyForKey ()
#6    0x937dfaf6 in _VolumeObserverDiskAppearedCallback ()
#7    0x9513f6ab in _DADispatchCallback ()
#8    0x9513f439 in _DASessionCallback ()
#9    0x9513f304 in __DASessionSetDispatchQueue_block_invoke_2 ()
#10    0x0030e94d in _dispatch_client_callout ()
#11    0x00323464 in _dispatch_continuation_pop ()
#12    0x00310eba in _dispatch_source_invoke ()
#13    0x00324b73 in _dispatch_queue_serial_drain ()
#14    0x003162e2 in _dispatch_queue_invoke ()
#15    0x0032646e in _dispatch_root_queue_drain_deferred_wlh ()
#16    0x0032b4bb in _dispatch_workloop_worker_thread ()
#17    0x00381601 in _pthread_wqthread ()
#18    0x0038121e in start_wqthread ()

Sak Wathanasin

#1211

On 2 Apr 2020, at 18:54, Sandor Szatmari <admin.szatmari.net@...> wrote:

Took a guess and enabled sandbox and added read/write to user selected file and the hang went away. Is it true that I cannot make an unsandboxed app and uses the NSSavePanel? I know this is a data point of one, so I want to be careful what conclusions I draw… any thoughts?

No, I have a non-sandboxed app and it works fine. I think the problem is that you are using NSSavePanel:runModal. If you look in the doc'n, it says:

"This method invokes NSApplication's runModalForWindow ..."

If it's doing that, then you need to cancel the modal yourslef (as with any call of runModalForWindow). Try putting a

[NSApp stopModalWithCode:NSModalResponseCancel];

in your "else" clause.

However, it may be simpler to use a sheet modal:

...setup code...

    [panel beginSheetModalForWindow:owningWindow

                  completionHandler:^(NSInteger result){

                      if (result == NSFileHandlingPanelOKButton)

{

                          self.saveFileURL = [[panel URLs] objectAtIndex:0];

                          [self writeToFileAtURL:self.saveFileURL];

}

}

];

You can spin the writing to a file off to a separate thread if it takes a long time.

Hope this helps,

Sak

Sandor Szatmari

#1212

Thanks Sak,

My discovery seemed random and unsettling, so I kept digging. I will read the docs you’re referring to But a sheet does seem to do the trick. What’s weird is this code has worked for years, so it must be some changes to the SDK I am updating to.

Sandor

Show quoted text

On Apr 2, 2020, at 14:31, Sak Wathanasin <sw@...> wrote:

On 2 Apr 2020, at 18:54, Sandor Szatmari <admin.szatmari.net@...> wrote:

Took a guess and enabled sandbox and added read/write to user selected file and the hang went away. Is it true that I cannot make an unsandboxed app and uses the NSSavePanel? I know this is a data point of one, so I want to be careful what conclusions I draw… any thoughts?

No, I have a non-sandboxed app and it works fine. I think the problem is that you are using NSSavePanel:runModal. If you look in the doc'n, it says:

"This method invokes NSApplication's runModalForWindow ..."

If it's doing that, then you need to cancel the modal yourslef (as with any call of runModalForWindow). Try putting a

[NSApp stopModalWithCode:NSModalResponseCancel];

in your "else" clause.

However, it may be simpler to use a sheet modal:
...setup code...
[panel beginSheetModalForWindow:owningWindow
completionHandler:^(NSInteger result){
if (result == NSFileHandlingPanelOKButton)
{
self.saveFileURL = [[panel URLs] objectAtIndex:0];
[self writeToFileAtURL:self.saveFileURL];
}
}
];

You can spin the writing to a file off to a separate thread if it takes a long time.

Hope this helps,

Sak

Rafael Bugajewski

#1213

Hi Sandor,

from the stacks it looks like you’ve Finder Extensions installed on your system. Can you disable / uninstall them and verify if the issue is still reproducible?

Best,
Rafał

Show quoted text

On 2020-01-04, at 11:31 PM, Sandor Szatmari <admin.szatmari.net@...> wrote:

Ran into an interesting issue today…
    Mac app
    Xcode 9.4.1, 32bit, 10.12 SDK, 10.6 Deployment Target
    non-sandboxed app

I am opening an NSSavePanel to allow a user to save the results of a report that is to be generated.

// Creating the save panel
  NSSavePanel* savePanel = [NSSavePanel savePanel];
 [savePanel setTitle:[NSString stringWithFormat:@"Export %@ Summary Data for %@", [self selectedReport], customerName]];

Opening the NSSavePanel using -runModal
 savePanelUserAction = [savePanel runModal];

If the user enters a filename and clicks continue the save dialog closes, the report is generated, and the file is written to disk at the selected location.
 if (savePanelUserAction == NSFileHandlingPanelOKButton)
    [NSThread detachNewThreadSelector:@selector(createSummary:) toTarget:self withObject:[[savePanel URL] path]];

If the user clicks cancel, the program hangs.  It hangs so badly that I have to go to the System Force-Quit dialog in order to fully terminate the app.
(i.e. Clicking stop program in Xcode does not fully terminate the app)
 else
 {
    // Program hangs
 }

I have checked that the NSSavePanel is being opened from the main thread.
I have included interesting backtraces below that are present if I stop the app in the de

Sandor

Thread 1 Queue : com.apple.main-thread (serial)
#0    0xa73d423e in kevent_id ()
#1    0x003305a6 in _dispatch_kq_poll ()
#2    0x00331141 in _dispatch_event_loop_wait_for_ownership ()
#3    0x00327b80 in _dispatch_sync_wait ()
#4    0x0031d500 in _dispatch_sync_f_slow ()
#5    0x0030f6d1 in dispatch_barrier_sync_f ()
#6    0x00316bf3 in dispatch_barrier_sync ()
#7    0x9387ebd4 in _VolumeObserverInvalidate ()
#8    0xa04ee78e in TSystemNotificationTask::~TSystemNotificationTask() ()
#9    0xa04ee818 in TSystemNotificationTask::FinalizeSystemNotificationTask() ()
#10    0xa04dda71 in NodeContextClose ()
#11    0x0afc689a in TFENode::Finalize() ()
#12    0x0b127290 in +[FIFinderViewGutsController finalizeCounted] ()
#13    0x0b127366 in __45+[FIFinderViewGutsController finalizeCounted]_block_invoke ()
#14    0x003167af in _dispatch_call_block_and_release ()
#15    0x0030e94d in _dispatch_client_callout ()
#16    0x0031ae6c in _dispatch_main_queue_callback_4CF ()
#17    0x937bb2ae in __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ ()
#18    0x9377ecf4 in __CFRunLoopRun ()
#19    0x9377dbd1 in CFRunLoopRunSpecific ()
#20    0x9377d93a in CFRunLoopRunInMode ()
#21    0x92d7b37b in RunCurrentEventLoopInMode ()
#22    0x92d7b0a2 in ReceiveNextEventCommon ()
#23    0x92d7ad7b in _BlockUntilNextEventMatchingListInModeWithFilter ()
#24    0x9137aafd in _DPSNextEvent ()
#25    0x91aece90 in -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] ()
#26    0x91aec35d in -[NSApplication(NSEvent) nextEventMatchingMask:untilDate:inMode:dequeue:] ()
#27    0x9136fa4d in -[NSApplication run] ()
#28    0x91341b0a in NSApplicationMain ()
#29    0x000026bc in main at /Users/username/repo/AppName/main.m:13
#30    0x00002685 in start ()
Enqueued from TBrowserViewDataSource (Thread 14) Queue : TBrowserViewDataSource (serial)
#0    0x0033f4dc in _dispatch_introspection_queue_item_enqueue ()
#1    0x00325cf8 in _dispatch_queue_push ()
#2    0x00323230 in _dispatch_continuation_push ()
#3    0x0032259b in _dispatch_continuation_async ()
#4    0x00316173 in dispatch_async ()
#5    0x0b1272f6 in +[FIFinderViewGutsController finalizeCounted] ()
#6    0x0b1aa3af in -[FI_TBrowserViewDataSource dealloc] ()
#7    0xa67a09f9 in objc_object::sidetable_release(bool) ()
#8    0xa679e2d0 in -[NSObject release] ()
#9    0x0b1aa762 in __destroy_helper_block_ ()
#10    0xa72c6b75 in _Block_release ()
#11    0x0030e94d in _dispatch_client_callout ()
#12    0x00324d3a in _dispatch_queue_serial_drain ()
#13    0x003162e2 in _dispatch_queue_invoke ()
#14    0x0032646e in _dispatch_root_queue_drain_deferred_wlh ()
#15    0x0032b4bb in _dispatch_workloop_worker_thread ()
#16    0x00381601 in _pthread_wqthread ()
#17    0x0038121e in start_wqthread ()
Enqueued from com.apple.main-thread (Thread 1) Queue : com.apple.main-thread (serial)
#0    0x0033f4dc in _dispatch_introspection_queue_item_enqueue ()
#1    0x00325cf8 in _dispatch_queue_push ()
#2    0x00323230 in _dispatch_continuation_push ()
#3    0x0032259b in _dispatch_continuation_async ()
#4    0x00316173 in dispatch_async ()
#5    0x0b1aa460 in -[FI_TBrowserViewDataSource aboutToTearDown] ()
#6    0x0b1e0aa5 in -[FI_TBrowserContainerController destroyBrowserView:] ()
#7    0x0b1e3ed4 in -[FIContainerController destroyBrowserView:] ()
#8    0x0b1e06c6 in -[FI_TBrowserContainerController aboutToTearDown] ()
#9    0x0b1e3f3b in -[FIContainerController aboutToTearDown] ()
#10    0xa67a0bda in -[NSObject performSelector:] ()
#11    0x0b042f47 in AboutToTearDownViewController(NSViewController*) ()
#12    0x0b07a83c in -[FI_TBrowserContentViewController aboutToTearDown] ()
#13    0xa67a0bda in -[NSObject performSelector:] ()
#14    0x0b042f47 in AboutToTearDownViewController(NSViewController*) ()
#15    0x0b1293f0 in -[FIFinderViewGutsController prepareToHide] ()
#16    0x0b12996f in -[FIFinderViewGutsController windowOrderedOut] ()
#17    0x0b13486f in -[FIFinderView windowOrderedOut] ()
#18    0x91e3ffe5 in -[NSNavFinderViewFileBrowser windowOrderedOut] ()
#19    0x91a4df5e in -[NSSavePanel _navViewWindowOrderedOut] ()
#20    0x91a4dfc5 in -[NSSavePanel orderOut:] ()
#21    0x91a5bffa in -[NSSavePanel _didEndSheet:returnCode:contextInfo:] ()
#22    0x91c27b17 in NSWindowEndWindowModalSession ()
#23    0x915acaf6 in -[NSWindow _endWindowBlockingModalSession:returnCode:] ()
#24    0x915aca86 in -[NSWindow endSheet:returnCode:] ()
#25    0x915f7367 in -[NSApplication endSheet:returnCode:] ()
#26    0x91a5e2cb in -[NSSavePanel _dismissWindowWithReturnCode:willRunSeamlessOpening:] ()
#27    0x91a5e2f1 in -[NSSavePanel _cancelAndClose] ()
#28    0x91a5e933 in -[NSSavePanel cancel:] ()
#29    0xa67a0c1c in -[NSObject performSelector:withObject:] ()
#30    0x91aeeca9 in __49-[NSApplication(NSResponder) sendAction:to:from:]_block_invoke ()
#31    0x91aeec4d in __NS_ACTIVITY_PERFORM_EXCEPTION_SAFE ()
#32    0x91aeeb4f in -[NSApplication(NSResponder) sendAction:to:from:] ()
#33    0x9159eda8 in -[NSControl sendAction:to:] ()
#34    0x9159ecc7 in __26-[NSCell _sendActionFrom:]_block_invoke ()
#35    0x917e5009 in __NS_ACTIVITY_PERFORM_EXCEPTION_SAFE ()
#36    0x9159ec11 in -[NSCell _sendActionFrom:] ()
#37    0x915dd6cb in -[NSButtonCell _sendActionFrom:] ()
#38    0x917e6e2c in __48-[NSCell trackMouse:inRect:ofView:untilMouseUp:]_block_invoke.1099 ()
#39    0x917e5009 in __NS_ACTIVITY_PERFORM_EXCEPTION_SAFE ()
#40    0x9159d58d in -[NSCell trackMouse:inRect:ofView:untilMouseUp:] ()
#41    0x915dd420 in -[NSButtonCell trackMouse:inRect:ofView:untilMouseUp:] ()
#42    0x9159bff4 in -[NSControl mouseDown:] ()
#43    0x91c922b4 in -[NSWindow(NSEventRouting) _handleMouseDownEvent:isDelayedEvent:] ()
#44    0x91c9024f in -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] ()
#45    0x91c8e4c0 in -[NSWindow(NSEventRouting) sendEvent:] ()
#46    0x91aeb2d5 in -[NSApplication(NSEvent) sendEvent:] ()
#47    0x9136fa98 in -[NSApplication run] ()
#48    0x91341b0a in NSApplicationMain ()
#49    0x000026bc in main at /Users/username/repo/AppName/main.m:13
#50    0x00002685 in start ()


// Other threads that seemed interesting, but could be misleading???

Thread 2 Queue : com.apple.CFVolumeObserver.0x6af670 (serial)
#0    0xa73d242a in __getattrlist ()
#1    0x9ffa770f in volumePropertyProviderPrepareValues(__CFURL const*, __FileCache*, __CFString const* const*, void const**, long, void const*, __CFError**) ()
#2    0x9ffa1ebd in prepareValuesForBitmap(__CFURL const*, __FileCache*, _FilePropertyBitmap*, __CFError**) ()
#3    0x9ff9f858 in _FSURLCopyResourcePropertyForKeyInternal(__CFURL const*, __CFString const*, void*, void*, __CFError**, unsigned char) ()
#4    0x9ff9f779 in _FSURLCopyResourcePropertyForKey ()
#5    0x93765cd0 in CFURLCopyResourcePropertyForKey ()
#6    0x937dfaf6 in _VolumeObserverDiskAppearedCallback ()
#7    0x9513f6ab in _DADispatchCallback ()
#8    0x9513f439 in _DASessionCallback ()
#9    0x9513f304 in __DASessionSetDispatchQueue_block_invoke_2 ()
#10    0x0030e94d in _dispatch_client_callout ()
#11    0x00323464 in _dispatch_continuation_pop ()
#12    0x00310eba in _dispatch_source_invoke ()
#13    0x00324b73 in _dispatch_queue_serial_drain ()
#14    0x003162e2 in _dispatch_queue_invoke ()
#15    0x0032646e in _dispatch_root_queue_drain_deferred_wlh ()
#16    0x0032b4bb in _dispatch_workloop_worker_thread ()
#17    0x00381601 in _pthread_wqthread ()
#18    0x0038121e in start_wqthread ()


Thread 10 Queue : com.apple.CFVolumeObserver.0x6ac5d0 (serial)
#0    0xa73d242a in __getattrlist ()
#1    0x9ffa770f in volumePropertyProviderPrepareValues(__CFURL const*, __FileCache*, __CFString const* const*, void const**, long, void const*, __CFError**) ()
#2    0x9ffa1ebd in prepareValuesForBitmap(__CFURL const*, __FileCache*, _FilePropertyBitmap*, __CFError**) ()
#3    0x9ff9f858 in _FSURLCopyResourcePropertyForKeyInternal(__CFURL const*, __CFString const*, void*, void*, __CFError**, unsigned char) ()
#4    0x9ff9f779 in _FSURLCopyResourcePropertyForKey ()
#5    0x93765cd0 in CFURLCopyResourcePropertyForKey ()
#6    0x937dfaf6 in _VolumeObserverDiskAppearedCallback ()
#7    0x9513f6ab in _DADispatchCallback ()
#8    0x9513f439 in _DASessionCallback ()
#9    0x9513f304 in __DASessionSetDispatchQueue_block_invoke_2 ()
#10    0x0030e94d in _dispatch_client_callout ()
#11    0x00323464 in _dispatch_continuation_pop ()
#12    0x00310eba in _dispatch_source_invoke ()
#13    0x00324b73 in _dispatch_queue_serial_drain ()
#14    0x003162e2 in _dispatch_queue_invoke ()
#15    0x0032646e in _dispatch_root_queue_drain_deferred_wlh ()
#16    0x0032b4bb in _dispatch_workloop_worker_thread ()
#17    0x00381601 in _pthread_wqthread ()
#18    0x0038121e in start_wqthread ()