Here's the fail log of xcodebuild with -destination flag, and without sudo upfront: 15:39:45 Exit status of command 'set -o pipefail && xcodebuild -project "SampleApp.xcodeproj" -scheme "SampleApp" -configuration "Release" clean -destination "platform=iOS Simulator,name=iPhone 13 Pro,OS=15.4" -derivedDataPath "/path/to/.derived_data/sim_app" build | tee '/path/to/artifacts/logs/build_sim/xcodebuild.log' | xcpretty --color --simple' was 70 instead of 0. 15:39:45 2024-09-25 15:39:14.700 xcodebuild[91142:22610080] Malformed bundle does not contain an identifier at /Library/Developer/CoreSimulator/Volumes/tvOS_22J5335e/Library/Developer/CoreSimulator/Profiles/Runtimes/tvOS 18.0.simruntime 15:39:45 2024-09-25 15:39:14.760 xcodebuild[91142:22610212] Malformed bundle does not contain an identifier at /Library/Developer/CoreSimulator/Volumes/tvOS_22J5335e/Library/Developer/CoreSimulator/Profiles/Runtimes/tvOS 18.0.simruntime 15:39:45 2024-09-25 15:39:43.986 xcodebuild[91142:22610077] Writing error result bundle to /var/folders/t2/vppt8b613w1b1pwfycwzgnc00000gr/T/ResultBundle_2024-25-09_15-39-0043.xcresult 15:39:45 xcodebuild: error: Unable to find a device matching the provided destination specifier: 15:39:45 { platform:iOS Simulator, OS:15.4, name:iPhone 13 Pro } 15:39:45 15:39:45 The requested device could not be found because multiple devices matched the request. ( 15:39:45 "<DVTiPhoneSimulator: 0x12467d3e0> {\n\t\tSimDevice: iPhone 13 Pro (7C44F49C-1406-4675-8297-0BB1E32030A4, iOS 15.4, Shutdown)\n}", 15:39:45 "<DVTiPhoneSimulator: 0x1246788e0> {\n\t\tSimDevice: iPhone 13 Pro (723AB83F-84B2-4553-A7FB-FE97FBC72A12, iOS 15.4, Shutdown)\n}" 15:39:45 ) ... 15:39:45 Available destinations for the "SampleApp" scheme: 15:39:45 { platform:macOS, arch:arm64, variant:Designed for [iPad,iPhone], id:00006020-0014092C3498C01E, name:My Mac } 15:39:45 { platform:iOS, id:dvtdevice-DVTiPhonePlaceholder-iphoneos:placeholder, name:Any iOS Device } 15:39:45 { platform:iOS Simulator, id:dvtdevice-DVTiOSDeviceSimulatorPlaceholder-iphonesimulator:placeholder, name:Any iOS Simulator Device } 15:39:45 { platform:visionOS Simulator, variant:Designed for [iPad,iPhone], id:5E4672C1-BFDC-4BF8-AECC-9101CAF005E2, OS:2.0, name:Apple Vision Pro } 15:39:45 { platform:visionOS Simulator, variant:Designed for [iPad,iPhone], id:F828FD1C-C6A9-4671-8A30-45888FE542C2, OS:2.1, name:Apple Vision Pro } 15:39:45 { platform:iOS Simulator, id:27B137B4-DDF5-4091-A77B-AEAE819E60BE, OS:15.4, name:iPad (9th generation) } 15:39:45 { platform:iOS Simulator, id:27B137B4-DDF5-4091-A77B-AEAE819E60BE, OS:15.4, name:iPad (9th generation) } 15:39:45 { platform:iOS Simulator, id:84E80242-3066-45BB-BE4A-24EC1512BE0E, OS:15.4, name:iPad (9th generation) } 15:39:45 { platform:iOS Simulator, id:84E80242-3066-45BB-BE4A-24EC1512BE0E, OS:15.4, name:iPad (9th generation) } ... 15:39:45 { platform:iOS Simulator, id:723AB83F-84B2-4553-A7FB-FE97FBC72A12, OS:15.4, name:iPhone 13 Pro } 15:39:45 { platform:iOS Simulator, id:723AB83F-84B2-4553-A7FB-FE97FBC72A12, OS:15.4, name:iPhone 13 Pro } 15:39:45 { platform:iOS Simulator, id:7C44F49C-1406-4675-8297-0BB1E32030A4, OS:15.4, name:iPhone 13 Pro } 15:39:45 { platform:iOS Simulator, id:7C44F49C-1406-4675-8297-0BB1E32030A4, OS:15.4, name:iPhone 13 Pro } 15:39:45 { platform:iOS Simulator, id:AA3C6F9C-A503-4301-8C70-760D20F31103, OS:15.4, name:iPhone 13 Pro Max } 15:39:45 { platform:iOS Simulator, id:AA3C6F9C-A503-4301-8C70-760D20F31103, OS:15.4, name:iPhone 13 Pro Max } ... Why do the simulator devices show up doubled? I executed job only once but seems like CoreSimulator starts up twice. I know this occurs intermittently but the problem shows up too frequently.

I found out what makes xcodebuild -showdestinations change behavior within the app codebases exactly. With Xcode 16.x on Sequoia, xcodebuild -showdestinations on the scheme without Swift Package dependencies shows only my mac, Any iOS Simulator Device, and Any iOS Device. If my app depends on any Swift Packages, the command finally prints out all the devices installed in my mac after resolving dependencies. but if the package dependencies are already resolved beforehand(e.g. by dependency cacheing) the command falls back to print out my mac, Any iOS Simulator Device, and Any iOS Device only. If you want to see what simulator devices are available, you should abandon SwiftPM cache and run SPM before executing command.

Additional information for onset: This VZError only occurs when the VM started up from SSH. If I try restoring VM directly on the mac or via VNC, both save and restore succeeds.

Thanks for the quick reply. I finally found what exactly reproduces the problem and what doesn't. If I do this with GUI on (VNC or local) restore works from whichever the restore process executed. (The screen should be turned on and logon should have been done by the user using VM before restore command starts) If I close the VNC, restore fails. Should restoreMachineState be executed with screen always on and logged on? Impossible with no-screen SSH only? As you suggested, I turned on fs_usage and checked when the error reproduced, seemed nothing special around the timing of error. Sorry that I cannot post it on here because I'm using VM on my company's mac.