HVF Illegal instruction: 4, High Sierra, v2.12-rc0 I've built v2.12.0-rc0 on MacOS using homebrew. I'm running 10.13.3 on a 5,1 Mac Pro with a X5690 processor. When I run 'qemu-system-x86_64 -M accel=hvf', I get a crash "Illegal instruction: 4". Process: qemu-system-x86_64 [6330] Path: /Users/USER/*/qemu-system-x86_64 Identifier: qemu-system-x86_64 Version: 0 Code Type: X86-64 (Native) Parent Process: bash [1558] Responsible: qemu-system-x86_64 [6330] User ID: 501 Date/Time: 2018-03-31 13:46:58.355 -0700 OS Version: Mac OS X 10.13.4 (17E199) Report Version: 12 Anonymous UUID: 28693BB0-7F66-6066-026C-DDE857D912F6 Time Awake Since Boot: 1800 seconds System Integrity Protection: disabled Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_BAD_INSTRUCTION (SIGILL) Exception Codes: 0x0000000000000001, 0x0000000000000000 Exception Note: EXC_CORPSE_NOTIFY Termination Signal: Illegal instruction: 4 Termination Reason: Namespace SIGNAL, Code 0x4 Terminating Process: exc handler [0] Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 qemu-system-x86_64 0x000000010d8acafc hvf_get_supported_cpuid + 300 (x86_cpuid.c:102) 1 qemu-system-x86_64 0x000000010d8453e8 x86_cpu_expand_features + 200 (cpu.c:2408) 2 qemu-system-x86_64 0x000000010d847770 x86_cpu_realizefn + 288 (cpu.c:3669) 3 qemu-system-x86_64 0x000000010d92fa73 device_set_realized + 899 (qdev.c:917) 4 qemu-system-x86_64 0x000000010da6e123 property_set_bool + 99 5 qemu-system-x86_64 0x000000010da6f410 object_property_set_qobject + 48 (qom-qobject.c:28) 6 qemu-system-x86_64 0x000000010da6ca71 object_property_set_bool + 49 (qobject.h:81) 7 qemu-system-x86_64 0x000000010d824baf pc_cpus_init + 415 (pc.c:1104) 8 qemu-system-x86_64 0x000000010d829c6d pc_init1 + 349 (pc_piix.c:157) 9 qemu-system-x86_64 0x000000010d8cb234 qemu_main + 17476 (vl.c:1275) 10 qemu-system-x86_64 0x000000010da6723e -[QemuCocoaAppController startEmulationWithArgc:argv:] + 30 (cocoa.m:1017) 11 com.apple.CoreFoundation 0x00007fff5294561c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12 12 com.apple.CoreFoundation 0x00007fff529454ea _CFXRegistrationPost + 458 13 com.apple.CoreFoundation 0x00007fff52945221 ___CFXNotificationPost_block_invoke + 225 14 com.apple.CoreFoundation 0x00007fff52903d72 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1826 15 com.apple.CoreFoundation 0x00007fff52902e03 _CFXNotificationPost + 659 16 com.apple.Foundation 0x00007fff54a1f8c7 -[NSNotificationCenter postNotificationName:object:userInfo:] + 66 17 com.apple.AppKit 0x00007fff4fff3206 -[NSApplication _postDidFinishNotification] + 313 18 com.apple.AppKit 0x00007fff4fff2e4f -[NSApplication _sendFinishLaunchingNotification] + 220 19 com.apple.AppKit 0x00007fff4fec5ab3 -[NSApplication(NSAppleEventHandling) _handleAEOpenEvent:] + 562 20 com.apple.AppKit 0x00007fff4fec56e9 -[NSApplication(NSAppleEventHandling) _handleCoreEvent:withReplyEvent:] + 690 21 com.apple.Foundation 0x00007fff54a62714 -[NSAppleEventManager dispatchRawAppleEvent:withRawReply:handlerRefCon:] + 287 22 com.apple.Foundation 0x00007fff54a62592 _NSAppleEventManagerGenericHandler + 102 23 com.apple.AE 0x00007fff53a3bdd0 aeDispatchAppleEvent(AEDesc const*, AEDesc*, unsigned int, unsigned char*) + 1788 24 com.apple.AE 0x00007fff53a3b677 dispatchEventAndSendReply(AEDesc const*, AEDesc*) + 41 25 com.apple.AE 0x00007fff53a3b565 aeProcessAppleEvent + 383 26 com.apple.HIToolbox 0x00007fff51c1d4a0 AEProcessAppleEvent + 55 27 com.apple.AppKit 0x00007fff4fec0d32 _DPSNextEvent + 2788 28 com.apple.AppKit 0x00007fff50656e34 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 3044 29 com.apple.AppKit 0x00007fff4feb5885 -[NSApplication run] + 764 30 qemu-system-x86_64 0x000000010da68e99 main + 2537 (cocoa.m:1462) 31 libdyld.dylib 0x00007fff7ace7015 start + 1 Thread 1: 0 libsystem_kernel.dylib 0x00007fff7ae37d8a __semwait_signal + 10 1 libsystem_c.dylib 0x00007fff7adb2724 nanosleep + 199 2 libglib-2.0.0.dylib 0x000000010e8fc9fe g_usleep + 71 3 qemu-system-x86_64 0x000000010db55f39 call_rcu_thread + 217 (rcu.c:244) 4 libsystem_pthread.dylib 0x00007fff7afff661 _pthread_body + 340 5 libsystem_pthread.dylib 0x00007fff7afff50d _pthread_start + 377 6 libsystem_pthread.dylib 0x00007fff7affebf9 thread_start + 13 Thread 2:: Dispatch queue: NSCGSDisableUpdates 0 libsystem_kernel.dylib 0x00007fff7ae2e20a mach_msg_trap + 10 1 libsystem_kernel.dylib 0x00007fff7ae2d724 mach_msg + 60 2 com.apple.SkyLight 0x00007fff74b129f5 CGSUpdateManager::enable_updates_common() + 565 3 com.apple.SkyLight 0x00007fff74ab6b28 CGSUpdateManager::enable_update(unsigned long long) + 320 4 libdispatch.dylib 0x00007fff7acb564a _dispatch_call_block_and_release + 12 5 libdispatch.dylib 0x00007fff7acade08 _dispatch_client_callout + 8 6 libdispatch.dylib 0x00007fff7acc2267 _dispatch_queue_serial_drain + 635 7 libdispatch.dylib 0x00007fff7acb51b6 _dispatch_queue_invoke + 373 8 libdispatch.dylib 0x00007fff7acc2f5d _dispatch_root_queue_drain_deferred_wlh + 332 9 libdispatch.dylib 0x00007fff7acc6d71 _dispatch_workloop_worker_thread + 880 10 libsystem_pthread.dylib 0x00007fff7affefd2 _pthread_wqthread + 980 11 libsystem_pthread.dylib 0x00007fff7affebe9 start_wqthread + 13 Thread 3: 0 libsystem_kernel.dylib 0x00007fff7ae38292 __workq_kernreturn + 10 1 libsystem_pthread.dylib 0x00007fff7afff009 _pthread_wqthread + 1035 2 libsystem_pthread.dylib 0x00007fff7affebe9 start_wqthread + 13 Thread 4: 0 libsystem_kernel.dylib 0x00007fff7ae38292 __workq_kernreturn + 10 1 libsystem_pthread.dylib 0x00007fff7afff009 _pthread_wqthread + 1035 2 libsystem_pthread.dylib 0x00007fff7affebe9 start_wqthread + 13 Thread 5: 0 libsystem_kernel.dylib 0x00007fff7ae38292 __workq_kernreturn + 10 1 libsystem_pthread.dylib 0x00007fff7afff009 _pthread_wqthread + 1035 2 libsystem_pthread.dylib 0x00007fff7affebe9 start_wqthread + 13 Thread 6: 0 libsystem_kernel.dylib 0x00007fff7ae38042 __sigwait + 10 1 libsystem_pthread.dylib 0x00007fff7b001ad9 sigwait + 61 2 qemu-system-x86_64 0x000000010db4061b sigwait_compat + 59 (compatfd.c:37) 3 libsystem_pthread.dylib 0x00007fff7afff661 _pthread_body + 340 4 libsystem_pthread.dylib 0x00007fff7afff50d _pthread_start + 377 5 libsystem_pthread.dylib 0x00007fff7affebf9 thread_start + 13 Thread 0 crashed with X86 Thread State (64-bit): rax: 0x000000010d8acae7 rbx: 0x000000000000000d rcx: 0x0000000000000000 rdx: 0x0000000000000002 rdi: 0x000000000000000d rsi: 0x0000000000000000 rbp: 0x00007ffee246eed0 rsp: 0x00007ffee246ee80 r8: 0x00007ffee246ee8c r9: 0x00007ffee246ee88 r10: 0x00007ffee246ee90 r11: 0x00007ffee246ee94 r12: 0x0000000000000000 r13: 0x00007f875509b201 r14: 0x0000000000000000 r15: 0x0000000000000000 rip: 0x000000010d8acafc rfl: 0x0000000000010246 cr2: 0x000000010d847650 Logical CPU: 2 Error Code: 0x00000000 Trap Number: 6 Disregard the above log; that was from a September 2017 build. On RC1: Process: qemu-system-x86_64 [6567] Path: /usr/local/bin/qemu-system-x86_64 Identifier: qemu-system-x86_64 Version: 0 Code Type: X86-64 (Native) Parent Process: bash [1558] Responsible: qemu-system-x86_64 [6567] User ID: 501 Date/Time: 2018-03-31 13:53:57.851 -0700 OS Version: Mac OS X 10.13.4 (17E199) Report Version: 12 Anonymous UUID: 28693BB0-7F66-6066-026C-DDE857D912F6 Time Awake Since Boot: 2200 seconds System Integrity Protection: disabled Crashed Thread: 0 Dispatch queue: com.apple.main-thread Exception Type: EXC_BAD_INSTRUCTION (SIGILL) Exception Codes: 0x0000000000000001, 0x0000000000000000 Exception Note: EXC_CORPSE_NOTIFY Termination Signal: Illegal instruction: 4 Termination Reason: Namespace SIGNAL, Code 0x4 Terminating Process: exc handler [0] Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 qemu-system-x86_64 0x000000010524165b 0x105134000 + 1103451 1 qemu-system-x86_64 0x00000001051e2481 0x105134000 + 713857 2 qemu-system-x86_64 0x00000001051e2170 0x105134000 + 713072 3 qemu-system-x86_64 0x00000001051e3e2a 0x105134000 + 720426 4 qemu-system-x86_64 0x00000001052b625a 0x105134000 + 1581658 5 qemu-system-x86_64 0x00000001053e5606 0x105134000 + 2823686 6 qemu-system-x86_64 0x00000001053e65bb 0x105134000 + 2827707 7 qemu-system-x86_64 0x00000001053e4126 0x105134000 + 2818342 8 qemu-system-x86_64 0x00000001051c35fc 0x105134000 + 587260 9 qemu-system-x86_64 0x00000001051c36e6 0x105134000 + 587494 10 qemu-system-x86_64 0x00000001051c8040 0x105134000 + 606272 11 qemu-system-x86_64 0x000000010525a462 0x105134000 + 1205346 12 qemu-system-x86_64 0x00000001053c8e28 0x105134000 + 2706984 13 com.apple.CoreFoundation 0x00007fff5294561c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12 14 com.apple.CoreFoundation 0x00007fff529454ea _CFXRegistrationPost + 458 15 com.apple.CoreFoundation 0x00007fff52945221 ___CFXNotificationPost_block_invoke + 225 16 com.apple.CoreFoundation 0x00007fff52903d72 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1826 17 com.apple.CoreFoundation 0x00007fff52902e03 _CFXNotificationPost + 659 18 com.apple.Foundation 0x00007fff54a1f8c7 -[NSNotificationCenter postNotificationName:object:userInfo:] + 66 19 com.apple.AppKit 0x00007fff4fff3206 -[NSApplication _postDidFinishNotification] + 313 20 com.apple.AppKit 0x00007fff4fff2e4f -[NSApplication _sendFinishLaunchingNotification] + 220 21 com.apple.AppKit 0x00007fff4fec5ab3 -[NSApplication(NSAppleEventHandling) _handleAEOpenEvent:] + 562 22 com.apple.AppKit 0x00007fff4fec56e9 -[NSApplication(NSAppleEventHandling) _handleCoreEvent:withReplyEvent:] + 690 23 com.apple.Foundation 0x00007fff54a62714 -[NSAppleEventManager dispatchRawAppleEvent:withRawReply:handlerRefCon:] + 287 24 com.apple.Foundation 0x00007fff54a62592 _NSAppleEventManagerGenericHandler + 102 25 com.apple.AE 0x00007fff53a3bdd0 aeDispatchAppleEvent(AEDesc const*, AEDesc*, unsigned int, unsigned char*) + 1788 26 com.apple.AE 0x00007fff53a3b677 dispatchEventAndSendReply(AEDesc const*, AEDesc*) + 41 27 com.apple.AE 0x00007fff53a3b565 aeProcessAppleEvent + 383 28 com.apple.HIToolbox 0x00007fff51c1d4a0 AEProcessAppleEvent + 55 29 com.apple.AppKit 0x00007fff4fec0d32 _DPSNextEvent + 2788 30 com.apple.AppKit 0x00007fff50656e34 -[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 3044 31 com.apple.AppKit 0x00007fff4feb5885 -[NSApplication run] + 764 32 qemu-system-x86_64 0x00000001053ca853 0x105134000 + 2713683 33 libdyld.dylib 0x00007fff7ace7015 start + 1 Thread 1: 0 libsystem_kernel.dylib 0x00007fff7ae37a1e __psynch_cvwait + 10 1 libsystem_pthread.dylib 0x00007fff7b000589 _pthread_cond_wait + 732 2 qemu-system-x86_64 0x00000001054b0b27 0x105134000 + 3656487 3 qemu-system-x86_64 0x00000001054bf128 0x105134000 + 3715368 4 libsystem_pthread.dylib 0x00007fff7afff661 _pthread_body + 340 5 libsystem_pthread.dylib 0x00007fff7afff50d _pthread_start + 377 6 libsystem_pthread.dylib 0x00007fff7affebf9 thread_start + 13 Thread 2: 0 libsystem_kernel.dylib 0x00007fff7ae38292 __workq_kernreturn + 10 1 libsystem_pthread.dylib 0x00007fff7afff009 _pthread_wqthread + 1035 2 libsystem_pthread.dylib 0x00007fff7affebe9 start_wqthread + 13 Thread 3:: Dispatch queue: NSCGSDisableUpdates 0 libsystem_kernel.dylib 0x00007fff7ae2e20a mach_msg_trap + 10 1 libsystem_kernel.dylib 0x00007fff7ae2d724 mach_msg + 60 2 com.apple.SkyLight 0x00007fff74b129f5 CGSUpdateManager::enable_updates_common() + 565 3 com.apple.SkyLight 0x00007fff74ab6b28 CGSUpdateManager::enable_update(unsigned long long) + 320 4 libdispatch.dylib 0x00007fff7acb564a _dispatch_call_block_and_release + 12 5 libdispatch.dylib 0x00007fff7acade08 _dispatch_client_callout + 8 6 libdispatch.dylib 0x00007fff7acc2267 _dispatch_queue_serial_drain + 635 7 libdispatch.dylib 0x00007fff7acb51b6 _dispatch_queue_invoke + 373 8 libdispatch.dylib 0x00007fff7acc2f5d _dispatch_root_queue_drain_deferred_wlh + 332 9 libdispatch.dylib 0x00007fff7acc6d71 _dispatch_workloop_worker_thread + 880 10 libsystem_pthread.dylib 0x00007fff7affefd2 _pthread_wqthread + 980 11 libsystem_pthread.dylib 0x00007fff7affebe9 start_wqthread + 13 Thread 4: 0 libsystem_pthread.dylib 0x00007fff7affebdc start_wqthread + 0 1 ??? 0x000070000e958b50 0 + 123145546992464 Thread 5: 0 libsystem_kernel.dylib 0x00007fff7ae38292 __workq_kernreturn + 10 1 libsystem_pthread.dylib 0x00007fff7afff009 _pthread_wqthread + 1035 2 libsystem_pthread.dylib 0x00007fff7affebe9 start_wqthread + 13 Thread 6: 0 libsystem_kernel.dylib 0x00007fff7ae38042 __sigwait + 10 1 libsystem_pthread.dylib 0x00007fff7b001ad9 sigwait + 61 2 qemu-system-x86_64 0x00000001054aee62 0x105134000 + 3649122 3 libsystem_pthread.dylib 0x00007fff7afff661 _pthread_body + 340 4 libsystem_pthread.dylib 0x00007fff7afff50d _pthread_start + 377 5 libsystem_pthread.dylib 0x00007fff7affebf9 thread_start + 13 Thread 7: 0 libsystem_kernel.dylib 0x00007fff7ae37cfa __select + 10 1 libglib-2.0.0.dylib 0x00000001061ebb60 g_poll + 430 2 qemu-system-x86_64 0x00000001054ae80b 0x105134000 + 3647499 3 qemu-system-x86_64 0x0000000105252eb2 0x105134000 + 1175218 4 libsystem_pthread.dylib 0x00007fff7afff661 _pthread_body + 340 5 libsystem_pthread.dylib 0x00007fff7afff50d _pthread_start + 377 6 libsystem_pthread.dylib 0x00007fff7affebf9 thread_start + 13 Thread 0 crashed with X86 Thread State (64-bit): rax: 0x0000000000000001 rbx: 0x000000000000000d rcx: 0x0000000000000000 rdx: 0x0000000000000000 rdi: 0x000000000000000d rsi: 0x0000000000000000 rbp: 0x00007ffeeaac9f40 rsp: 0x00007ffeeaac9f00 r8: 0x00007ffeeaac9f04 r9: 0x00007ffeeaac9f00 r10: 0x00007ffeeaac9f08 r11: 0x00007ffeeaac9f0c r12: 0x0000000000000000 r13: 0x00007fe43f0af400 r14: 0x0000000000000000 r15: 0x0000000000000000 rip: 0x000000010524165b rfl: 0x0000000000010246 cr2: 0x000000010518235d Logical CPU: 0 Error Code: 0x00000000 Trap Number: 6 I am also able to reproduce this bug. The problem is that when hvf is enabled, qemu will attempt to execute the xgetbv instruction, which isn't supported on my processor (Intel Xeon X5670). Here is a stack trace from lldb; the behavior is 100% reproducible for me. nathan@Nathans-Mac-Pro:~/src/qemu/qemu-3.0.0/x86_64-softmmu $ lldb -- qemu-system-x86_64 --accel hvf (lldb) target create "qemu-system-x86_64" runCurrent executable set to 'qemu-system-x86_64' (x86_64). (lldb) settings set -- target.run-args "--accel" "hvf" (lldb) run Process 27479 launched: '/Users/nathan/src/qemu/qemu-3.0.0/x86_64-softmmu/qemu-system-x86_64' (x86_64) Process 27479 stopped * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) frame #0: 0x00000001001bca3a qemu-system-x86_64`xgetbv(xcr=0) at x86_cpuid.c:34 31 { 32 uint32_t eax, edx; 33 -> 34 __asm__ volatile ("xgetbv" 35 : "=a" (eax), "=d" (edx) 36 : "c" (xcr)); 37 Target 0: (qemu-system-x86_64) stopped. (lldb) bt * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0) * frame #0: 0x00000001001bca3a qemu-system-x86_64`xgetbv(xcr=0) at x86_cpuid.c:34 frame #1: 0x00000001001bc8a6 qemu-system-x86_64`hvf_get_supported_cpuid(func=13, idx=0, reg=0) at x86_cpuid.c:116 frame #2: 0x0000000100143a21 qemu-system-x86_64`x86_cpu_get_supported_feature_word(w=FEAT_XSAVE_COMP_LO, migratable_only=false) at cpu.c:3498 frame #3: 0x000000010014367d qemu-system-x86_64`x86_cpu_filter_features(cpu=0x00000001040a2c00) at cpu.c:4749 frame #4: 0x0000000100146c65 qemu-system-x86_64`x86_cpu_realizefn(dev=0x00000001040a2c00, errp=0x00007ffeefbfd620) at cpu.c:4834 frame #5: 0x000000010028a84b qemu-system-x86_64`device_set_realized(obj=0x00000001040a2c00, value=true, errp=0x00007ffeefbfd7d0) at qdev.c:826 frame #6: 0x00000001004b6d4d qemu-system-x86_64`property_set_bool(obj=0x00000001040a2c00, v=0x0000000101c49a20, name="realized", opaque=0x0000000101a996d0, errp=0x00007ffeefbfd7d0) at object.c:1984 frame #7: 0x00000001004b4ae8 qemu-system-x86_64`object_property_set(obj=0x00000001040a2c00, v=0x0000000101c49a20, name="realized", errp=0x00007ffeefbfd7d0) at object.c:1176 frame #8: 0x00000001004b8e8a qemu-system-x86_64`object_property_set_qobject(obj=0x00000001040a2c00, value=0x0000000101c49a00, name="realized", errp=0x00007ffeefbfd7d0) at qom-qobject.c:27 frame #9: 0x00000001004b5092 qemu-system-x86_64`object_property_set_bool(obj=0x00000001040a2c00, value=true, name="realized", errp=0x00007ffeefbfd7d0) at object.c:1242 frame #10: 0x000000010010ae20 qemu-system-x86_64`pc_new_cpu(typename="qemu64-x86_64-cpu", apic_id=0, errp=0x0000000100c44de0) at pc.c:1107 frame #11: 0x000000010010af4c qemu-system-x86_64`pc_cpus_init(pcms=0x0000000101d630b0) at pc.c:1155 frame #12: 0x000000010011294e qemu-system-x86_64`pc_init1(machine=0x0000000101d630b0, host_type="i440FX-pcihost", pci_type="i440FX") at pc_piix.c:153 frame #13: 0x0000000100112640 qemu-system-x86_64`pc_init_v3_0(machine=0x0000000101d630b0) at pc_piix.c:438 frame #14: 0x0000000100291f25 qemu-system-x86_64`machine_run_board_init(machine=0x0000000101d630b0) at machine.c:830 frame #15: 0x00000001001e583f qemu-system-x86_64`qemu_main(argc=3, argv=0x00007ffeefbff818, envp=0x00007ffeefbff838) at vl.c:4516 frame #16: 0x0000000100486459 qemu-system-x86_64`-[QemuCocoaAppController startEmulationWithArgc:argv:](self=0x0000000101c16510, _cmd="startEmulationWithArgc:argv:", argc=3, argv=0x00007ffeefbff818) at cocoa.m:1093 frame #17: 0x00000001004862f7 qemu-system-x86_64`-[QemuCocoaAppController applicationDidFinishLaunching:](self=0x0000000101c16510, _cmd="applicationDidFinishLaunching:", note=@"NSApplicationDidFinishLaunchingNotification") at cocoa.m:1045 frame #18: 0x00007fff4c99447c CoreFoundation`__CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 12 frame #19: 0x00007fff4c99434a CoreFoundation`_CFXRegistrationPost + 458 frame #20: 0x00007fff4c994081 CoreFoundation`___CFXNotificationPost_block_invoke + 225 frame #21: 0x00007fff4c952c12 CoreFoundation`-[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1826 frame #22: 0x00007fff4c951ca3 CoreFoundation`_CFXNotificationPost + 659 frame #23: 0x00007fff4ea7c817 Foundation`-[NSNotificationCenter postNotificationName:object:userInfo:] + 66 frame #24: 0x00007fff4a041206 AppKit`-[NSApplication _postDidFinishNotification] + 313 frame #25: 0x00007fff4a040e4f AppKit`-[NSApplication _sendFinishLaunchingNotification] + 220 frame #26: 0x00007fff49f13ab3 AppKit`-[NSApplication(NSAppleEventHandling) _handleAEOpenEvent:] + 562 frame #27: 0x00007fff49f136e9 AppKit`-[NSApplication(NSAppleEventHandling) _handleCoreEvent:withReplyEvent:] + 690 frame #28: 0x00007fff4eabf664 Foundation`-[NSAppleEventManager dispatchRawAppleEvent:withRawReply:handlerRefCon:] + 287 frame #29: 0x00007fff4eabf4e2 Foundation`_NSAppleEventManagerGenericHandler + 102 frame #30: 0x00007fff4da97dd0 AE`aeDispatchAppleEvent(AEDesc const*, AEDesc*, unsigned int, unsigned char*) + 1788 frame #31: 0x00007fff4da97677 AE`dispatchEventAndSendReply(AEDesc const*, AEDesc*) + 41 frame #32: 0x00007fff4da97565 AE`aeProcessAppleEvent + 383 frame #33: 0x00007fff4bc6e4a0 HIToolbox`AEProcessAppleEvent + 55 frame #34: 0x00007fff49f0ed32 AppKit`_DPSNextEvent + 2788 frame #35: 0x00007fff4a6a4e34 AppKit`-[NSApplication(NSEvent) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 3044 frame #36: 0x00007fff49f03885 AppKit`-[NSApplication run] + 764 frame #37: 0x0000000100489161 qemu-system-x86_64`main(argc=3, argv=0x00007ffeefbff818) at cocoa.m:1537 frame #38: 0x00007fff7493e015 libdyld.dylib`start + 1 frame #39: 0x00007fff7493e015 libdyld.dylib`start + 1 (lldb) p xcr (uint32_t) $0 = 0 According to the response here: https://