I'm also getting this on BuddyBuild - any thoughts Apple? xcodebuild test ... plus with Xcode12.2 locally I have 3 sims loading but only 1 gets used - related? Process:							 testmanagerd [13201] Path:									/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 14.1.simruntime/Contents/Resources/RuntimeRoot/usr/libexec/testmanagerd Identifier:						testmanagerd Version:							 17155 Code Type:						 X86-64 (Native) Parent Process:				??? [2618] Responsible:					 SimulatorTrampoline [2327] User ID:							 501 Date/Time:						 2020-12-02 21:20:55.829 -0800 OS Version:						Mac OS X 10.15.5 (19F101) Report Version:				12 Anonymous UUID:				23374693-F36A-48E0-B53B-F41ABCE2242A Time Awake Since Boot: 11000 seconds System Integrity Protection: disabled Crashed Thread:				0	Dispatch queue: com.apple.main-thread Exception Type:				EXC_CRASH (SIGKILL) Exception Codes:			 0x0000000000000000, 0x0000000000000000 Exception Note:				EXC_CORPSE_NOTIFY Termination Reason:		Namespace LIBXPC, Code 0x4 Application Specific Information: CoreSimulator 732.18.5 - Device: iPhone 12 Pro Max (3A9F7513-2ADD-4660-81E4-EC75AA1BFA11) - Runtime: iOS 14.1 (18A8394) - DeviceType: iPhone 12 Pro Max Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0	 libsystem_kernel.dylib				 0x00000001068b2dfa mach_msg_trap + 10 1	 libsystem_kernel.dylib				 0x00000001068b3170 mach_msg + 60 2	 com.apple.CoreFoundation			 0x0000000104c41e77 __CFRunLoopServiceMachPort + 316 3	 com.apple.CoreFoundation			 0x0000000104c3c58d __CFRunLoopRun + 1284 4	 com.apple.CoreFoundation			 0x0000000104c3bb9e CFRunLoopRunSpecific + 567 5	 com.apple.CoreFoundation			 0x0000000104c3ccf1 CFRunLoopRun + 40 6	 testmanagerd									 0x0000000102357180 -[XCTDaemon run] + 399 7	 testmanagerd									 0x00000001023304fa main + 318 8	 libdyld.dylib								 0x00000001064de409 start + 1 Thread 1: 0	 libsystem_pthread.dylib			 0x0000000106912b68 start_wqthread + 0 Thread 2: 0	 libsystem_pthread.dylib			 0x0000000106912b68 start_wqthread + 0 Thread 3: 0	 libsystem_pthread.dylib			 0x0000000106912b68 start_wqthread + 0 Thread 4: 0	 libsystem_pthread.dylib			 0x0000000106912b68 start_wqthread + 0 Thread 5: 0	 libsystem_pthread.dylib			 0x0000000106912b68 start_wqthread + 0 Thread 0 crashed with X86 Thread State (64-bit): 	rax: 0x0000000010004005	rbx: 0x0000000007000806	rcx: 0x00007ffeed8cf978	rdx: 0x0000000000000000 	rdi: 0x00007ffeed8cfb60	rsi: 0x0000000007000806	rbp: 0x00007ffeed8cf9d0	rsp: 0x00007ffeed8cf978 	 r8: 0x0000000000002703	 r9: 0x00000000ffffffff	r10: 0x0000000000000c00	r11: 0x0000000000000206 	r12: 0x0000000007000806	r13: 0x0000000000000c00	r14: 0x00007ffeed8cfb60	r15: 0x0000000000000000 	rip: 0x00000001068b2dfa	rfl: 0x0000000000000206	cr2: 0x00007f9e42171de8 	 Logical CPU:		 0 Error Code:			0x0100001f Trap Number:		 133