-[UIApplication canOpenURL:] deadlock

Originator:futuretap
Number:rdar://21386259 Date Originated:15-Jun-2015 08:32 PM
Status:Open Resolved:
Product:iOS SDK Product Version:9.0 beta 1
Classification:Serious Bug Reproducible:Unable
 
I just experienced a deadlock in -[UIApplication canOpenURL:] with the following backtrace:

* thread #1: tid = 0x23e07, 0x000000019a998b08 libsystem_kernel.dylib`semaphore_wait_trap + 8, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
  * frame #0: 0x000000019a998b08 libsystem_kernel.dylib`semaphore_wait_trap + 8
    frame #1: 0x00000001013f2cd8 libdispatch.dylib`_dispatch_semaphore_wait_slow + 244
    frame #2: 0x000000019aaa706c libxpc.dylib`xpc_connection_send_message_with_reply_sync + 204
    frame #3: 0x0000000187e71678 MobileCoreServices`_LSCanOpenURL + 96
    frame #4: 0x0000000187e776a8 MobileCoreServices`-[LSApplicationWorkspace isApplicationAvailableToOpenURL:error:] + 332
    frame #5: 0x000000018a7bf784 UIKit`-[UIApplication _applicationProxyForURL:publicURLsOnly:] + 100
    frame #6: 0x000000018a79601c UIKit`-[UIApplication _canOpenURL:publicURLsOnly:] + 256
    frame #7: 0x000000018a7bf958 UIKit`-[UIApplication canOpenURL:] + 236
    frame #8: 0x000000010010f3d8 Where To`-[UIApplication(self=0x000000015ed7bb90, _cmd=0x000000018ae3cdb3, url=0x00000001660dcc70) myCanOpenURL:] + 684 at UIApplication+Additions.m:61

The app waits forever in this backtrace and is completely unresponsive.

The call was made right after putting the app into the foreground.

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