My 30+ yoe dev, I have to say Apple Dev support is almost nil.
Look at their reply:
Thank you for reporting this issue.
> attach failed (Not allowed to attach to process. Look in the console messages (Console.app), near the debugserver entries, when the attach failed. The subsystem that denied the attach permission will likely have logged an informative message about why it was denied.)
This behaves correctly.
Ridiculous
Could not attach to pid : “12532”
Domain: IDEDebugSessionErrorDomain
Code: 6
Failure Reason: Ensure “VirgoDoji” is not already running, and virgosun has permission to debug it.
User Info: {
DVTErrorCreationDateKey = "2026-03-14 00:41:49 +0000";
DVTRadarComponentKey = 855031;
IDERunOperationFailingWorker = DBGLLDBLauncher;
RawUnderlyingErrorMessage = "attach failed (Not allowed to attach to process. Look in the console messages (Console.app), near the debugserver entries, when the attach failed. The subsystem that denied the attach permission will likely have logged an informative message about why it was denied.)";
}
--
Event Metadata: com.apple.dt.IDERunOperationWorkerFinished : {
"device_identifier" = "4B47301C-B29F-4377-A99A-42A235AFE43F";
"device_model" = "iPhone18,2";
"device_osBuild" = "26.3.1 (23D8133)";
"device_osBuild_monotonic" = 2303813300;
"device_os_variant" = 1;
"device_platform" = "com.apple.platform.iphonesimulator";
"device_platform_family" = 2;
"device_reality" = 2;
"device_thinningType" = "iPhone18,2";
"device_transport" = 4;
"launchSession_schemeCommand" = Run;
"launchSession_schemeCommand_enum" = 1;
"launchSession_targetArch" = "x86_64";
"launchSession_targetArch_enum" = 1;
"operation_duration_ms" = 7067;
"operation_errorCode" = 6;
"operation_errorDomain" = IDEDebugSessionErrorDomain;
"operation_errorWorker" = DBGLLDBLauncher;
"operation_error_reportable" = 1;
"operation_name" = IDERunOperationWorkerGroup;
"param_consoleMode" = 1;
"param_debugger_attachToExtensions" = 0;
"param_debugger_attachToXPC" = 1;
"param_debugger_type" = 3;
"param_destination_isProxy" = 0;
"param_destination_platform" = "com.apple.platform.iphonesimulator";
"param_diag_MTE_enable" = 0;
"param_diag_MainThreadChecker_stopOnIssue" = 0;
"param_diag_MallocStackLogging_enableDuringAttach" = 0;
"param_diag_MallocStackLogging_enableForXPC" = 1;
"param_diag_allowLocationSimulation" = 1;
"param_diag_checker_mtc_enable" = 1;
"param_diag_checker_tpc_enable" = 1;
"param_diag_gpu_frameCapture_enable" = 0;
"param_diag_gpu_shaderValidation_enable" = 0;
"param_diag_gpu_validation_enable" = 0;
"param_diag_guardMalloc_enable" = 0;
"param_diag_memoryGraphOnResourceException" = 0;
"param_diag_queueDebugging_enable" = 1;
"param_diag_runtimeProfile_generate" = 0;
"param_diag_sanitizer_asan_enable" = 0;
"param_diag_sanitizer_tsan_enable" = 0;
"param_diag_sanitizer_tsan_stopOnIssue" = 0;
"param_diag_sanitizer_ubsan_enable" = 0;
"param_diag_sanitizer_ubsan_stopOnIssue" = 0;
"param_diag_showNonLocalizedStrings" = 0;
"param_diag_viewDebugging_enabled" = 1;
"param_diag_viewDebugging_insertDylibOnLaunch" = 1;
"param_install_style" = 2;
"param_launcher_UID" = 2;
"param_launcher_allowDeviceSensorReplayData" = 0;
"param_launcher_kind" = 0;
"param_launcher_style" = 0;
"param_launcher_substyle" = 0;
"param_lldbVersion_component_idx_1" = 0;
"param_lldbVersion_monotonic" = 170302360103;
"param_runnable_appExtensionHostRunMode" = 0;
"param_runnable_productType" = "com.apple.product-type.application";
"param_testing_launchedForTesting" = 0;
"param_testing_suppressSimulatorApp" = 0;
"param_testing_usingCLI" = 0;
"sdk_canonicalName" = "iphonesimulator26.2";
"sdk_osVersion" = "26.2";
"sdk_platformID" = 7;
"sdk_variant" = iphonesimulator;
"sdk_version_monotonic" = 2302005700;
}
--
System Information:
macOS Version 26.3.1 (Build 25D2128)
People have to solve themselves
stackoverflow.com
Look at their reply:
Thank you for reporting this issue.
> attach failed (Not allowed to attach to process. Look in the console messages (Console.app), near the debugserver entries, when the attach failed. The subsystem that denied the attach permission will likely have logged an informative message about why it was denied.)
This behaves correctly.
Ridiculous
Could not attach to pid : “12532”
Domain: IDEDebugSessionErrorDomain
Code: 6
Failure Reason: Ensure “VirgoDoji” is not already running, and virgosun has permission to debug it.
User Info: {
DVTErrorCreationDateKey = "2026-03-14 00:41:49 +0000";
DVTRadarComponentKey = 855031;
IDERunOperationFailingWorker = DBGLLDBLauncher;
RawUnderlyingErrorMessage = "attach failed (Not allowed to attach to process. Look in the console messages (Console.app), near the debugserver entries, when the attach failed. The subsystem that denied the attach permission will likely have logged an informative message about why it was denied.)";
}
--
Event Metadata: com.apple.dt.IDERunOperationWorkerFinished : {
"device_identifier" = "4B47301C-B29F-4377-A99A-42A235AFE43F";
"device_model" = "iPhone18,2";
"device_osBuild" = "26.3.1 (23D8133)";
"device_osBuild_monotonic" = 2303813300;
"device_os_variant" = 1;
"device_platform" = "com.apple.platform.iphonesimulator";
"device_platform_family" = 2;
"device_reality" = 2;
"device_thinningType" = "iPhone18,2";
"device_transport" = 4;
"launchSession_schemeCommand" = Run;
"launchSession_schemeCommand_enum" = 1;
"launchSession_targetArch" = "x86_64";
"launchSession_targetArch_enum" = 1;
"operation_duration_ms" = 7067;
"operation_errorCode" = 6;
"operation_errorDomain" = IDEDebugSessionErrorDomain;
"operation_errorWorker" = DBGLLDBLauncher;
"operation_error_reportable" = 1;
"operation_name" = IDERunOperationWorkerGroup;
"param_consoleMode" = 1;
"param_debugger_attachToExtensions" = 0;
"param_debugger_attachToXPC" = 1;
"param_debugger_type" = 3;
"param_destination_isProxy" = 0;
"param_destination_platform" = "com.apple.platform.iphonesimulator";
"param_diag_MTE_enable" = 0;
"param_diag_MainThreadChecker_stopOnIssue" = 0;
"param_diag_MallocStackLogging_enableDuringAttach" = 0;
"param_diag_MallocStackLogging_enableForXPC" = 1;
"param_diag_allowLocationSimulation" = 1;
"param_diag_checker_mtc_enable" = 1;
"param_diag_checker_tpc_enable" = 1;
"param_diag_gpu_frameCapture_enable" = 0;
"param_diag_gpu_shaderValidation_enable" = 0;
"param_diag_gpu_validation_enable" = 0;
"param_diag_guardMalloc_enable" = 0;
"param_diag_memoryGraphOnResourceException" = 0;
"param_diag_queueDebugging_enable" = 1;
"param_diag_runtimeProfile_generate" = 0;
"param_diag_sanitizer_asan_enable" = 0;
"param_diag_sanitizer_tsan_enable" = 0;
"param_diag_sanitizer_tsan_stopOnIssue" = 0;
"param_diag_sanitizer_ubsan_enable" = 0;
"param_diag_sanitizer_ubsan_stopOnIssue" = 0;
"param_diag_showNonLocalizedStrings" = 0;
"param_diag_viewDebugging_enabled" = 1;
"param_diag_viewDebugging_insertDylibOnLaunch" = 1;
"param_install_style" = 2;
"param_launcher_UID" = 2;
"param_launcher_allowDeviceSensorReplayData" = 0;
"param_launcher_kind" = 0;
"param_launcher_style" = 0;
"param_launcher_substyle" = 0;
"param_lldbVersion_component_idx_1" = 0;
"param_lldbVersion_monotonic" = 170302360103;
"param_runnable_appExtensionHostRunMode" = 0;
"param_runnable_productType" = "com.apple.product-type.application";
"param_testing_launchedForTesting" = 0;
"param_testing_suppressSimulatorApp" = 0;
"param_testing_usingCLI" = 0;
"sdk_canonicalName" = "iphonesimulator26.2";
"sdk_osVersion" = "26.2";
"sdk_platformID" = 7;
"sdk_variant" = iphonesimulator;
"sdk_version_monotonic" = 2302005700;
}
--
System Information:
macOS Version 26.3.1 (Build 25D2128)
People have to solve themselves
Xcode 14 is not getting attached to Simulator in Debug mode
While debugging any iOS application, Xcode builds and run successfully, also launches a simulator but it is not able to attach debugger from Xcode 14 to Simulator iOS app. It throws an error in Xco...
