Tor Browser UI hang on macOS when closing window
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I am using Tor Browser 7.0.2 on macOS 10.12.5.
I closed a Tor Browser window that was waiting for a network connection. It hung the entire UI with the following call stack:
1075 Thread_8568 DispatchQueue_1: com.apple.main-thread (serial)
+ 1075 ??? (in XUL) load address 0x10c5d0000 + 0x1c06472 [0x10e1d6472]
+ 1075 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] (in AppKit) + 2796 [0x7fff965897ee]
+ 1075 _DPSNextEvent (in AppKit) + 1120 [0x7fff95e0da54]
+ 1075 _BlockUntilNextEventMatchingListInModeWithFilter (in HIToolbox) + 71 [0x7fff97874b26]
+ 1075 ReceiveNextEventCommon (in HIToolbox) + 432 [0x7fff97874cf1]
+ 1075 RunCurrentEventLoopInMode (in HIToolbox) + 240 [0x7fff97874ebc]
+ 1075 CFRunLoopRunSpecific (in CoreFoundation) + 420 [0x7fff98314114]
+ 1075 __CFRunLoopRun (in CoreFoundation) + 934 [0x7fff98314716]
+ 1075 __CFRunLoopDoSources0 (in CoreFoundation) + 557 [0x7fff9831521d]
+ 1075 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ (in CoreFoundation) + 17 [0x7fff98334321]
+ 1075 ??? (in XUL) load address 0x10c5d0000 + 0x1bd7434 [0x10e1a7434]
+ 1075 -[NSView removeFromSuperview] (in AppKit) + 465 [0x7fff95df2587]
+ 1075 -[NSView _setWindow:] (in AppKit) + 2575 [0x7fff95def960]
+ 1075 -[NSSurface setWindow:] (in AppKit) + 53 [0x7fff960159ea]
+ 1075 -[NSSurface _disposeSurface] (in AppKit) + 152 [0x7fff96015e3b]
+ 1075 -[NSNotificationCenter postNotificationName:object:userInfo:] (in Foundation) + 66 [0x7fff99d0b677]
+ 1075 _CFXNotificationPost (in CoreFoundation) + 604 [0x7fff982e655c]
+ 1075 -[_CFXNotificationRegistrar find:object:observer:enumerator:] (in CoreFoundation) + 1827 [0x7fff982e7523]
+ 1075 ___CFXNotificationPost_block_invoke (in CoreFoundation) + 50 [0x7fff9832a0c2]
+ 1075 _CFXRegistrationPost (in CoreFoundation) + 427 [0x7fff9832a35b]
+ 1075 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ (in CoreFoundation) + 12 [0x7fff9832a45c]
+ 1075 CGLClearDrawable (in OpenGL) + 41 [0x7fff9d2d8afe]
+ 1075 _pthread_mutex_lock_slow (in libsystem_pthread.dylib) + 285 [0x7fffadcab519]
+ 1075 _pthread_mutex_lock_wait (in libsystem_pthread.dylib) + 100 [0x7fffadcaddfa]
+ 1075 __psynch_mutexwait (in libsystem_kernel.dylib) + 10 [0x7fffadbc2c22]