ENV: macOS: catalina 10.15.4 XCODE: 11.5 (11E608c)
I start a new project and add one very simple unit test as below:
func testExample() throws {
		XCTAssertEqual(0, 0)
}
It builds successfully and simulator works well, my app launched successfully, but the unit testing is always waiting to init and run tests, everytime i failed to start unitest and i always get the following crashing error:
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
the whole error message is like the following:
thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
	* frame #0: 0x00007fff51b5adfa libsystem_kernel.dylib`mach_msg_trap + 10
		frame #1: 0x00007fff51b5b170 libsystem_kernel.dylib`mach_msg + 60
		frame #2: 0x00007fff23da0595 CoreFoundation`__CFRunLoopServiceMachPort + 165
		frame #3: 0x00007fff23d9b1c7 CoreFoundation`__CFRunLoopRun + 1383
		frame #4: 0x00007fff23d9a944 CoreFoundation`CFRunLoopRunSpecific + 404
		frame #5: 0x00007fff38ba6c1a GraphicsServices`GSEventRunModal + 139
		frame #6: 0x00007fff48c8b9ec UIKitCore`UIApplicationMain + 1605
		frame #7: 0x000000010e286d2b iep-ios-app`main at AppDelegate.swift:15:7
		frame #8: 0x00007fff51a231fd libdyld.dylib`start + 1
		frame #9: 0x00007fff51a231fd libdyld.dylib`start + 1
	thread #6, name = 'com.apple.uikit.eventfetch-thread'
		frame #0: 0x00007fff51b5adfa libsystem_kernel.dylib`mach_msg_trap + 10
		frame #1: 0x00007fff51b5b170 libsystem_kernel.dylib`mach_msg + 60
		frame #2: 0x00007fff23da0595 CoreFoundation`__CFRunLoopServiceMachPort + 165
		frame #3: 0x00007fff23d9b1c7 CoreFoundation`__CFRunLoopRun + 1383
		frame #4: 0x00007fff23d9a944 CoreFoundation`CFRunLoopRunSpecific + 404
		frame #5: 0x00007fff25939c71 Foundation`-[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 211
		frame #6: 0x00007fff25939ee0 Foundation`-[NSRunLoop(NSRunLoop) runUntilDate:] + 72
		frame #7: 0x00007fff48d39bfb UIKitCore`-[UIEventFetcher threadMain] + 138
		frame #8: 0x00007fff2594f9eb Foundation`NSThreadstart__ + 1047
		frame #9: 0x00007fff51c0c109 libsystem_pthread.dylib`_pthread_start + 148
		frame #10: 0x00007fff51c07b8b libsystem_pthread.dylib`thread_start + 15
	thread #14, name = 'com.apple.NSURLConnectionLoader'
		frame #0: 0x00007fff51b5adfa libsystem_kernel.dylib`mach_msg_trap + 10
		frame #1: 0x00007fff51b5b170 libsystem_kernel.dylib`mach_msg + 60
		frame #2: 0x00007fff23da0595 CoreFoundation`__CFRunLoopServiceMachPort + 165
		frame #3: 0x00007fff23d9b1c7 CoreFoundation`__CFRunLoopRun + 1383
		frame #4: 0x00007fff23d9a944 CoreFoundation`CFRunLoopRunSpecific + 404
		frame #5: 0x00007fff23159df3 CFNetwork`___lldb_unnamed_symbol11344$$CFNetwork + 182
		frame #6: 0x00007fff2594f9eb Foundation`NSThreadstart__ + 1047
		frame #7: 0x00007fff51c0c109 libsystem_pthread.dylib`_pthread_start + 148
		frame #8: 0x00007fff51c07b8b libsystem_pthread.dylib`thread_start + 15
	thread #21
		frame #0: 0x00007fff51b5c4ce libsystem_kernel.dylib`__workq_kernreturn + 10
		frame #1: 0x00007fff51c08aa1 libsystem_pthread.dylib`_pthread_wqthread + 390
		frame #2: 0x00007fff51c07b77 libsystem_pthread.dylib`start_wqthread + 15
Possible actions:
I updated my mac os , and try to kill all other process on my computer, it's still not solved. Is there any xcode version bug? or what should i do to downgrade the xcode version?
jellyhan
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