Here's an example failure that didn't stop the build:
Target Name=_RunILLink Project=sampleproj.csproj
Building target "_RunILLink" completely.
Output file "obj\Release\net8.0-ios\ios-arm64\linked\Link.semaphore" does not exist.
[...]
Xamarin.MacDev.Tasks.ILLink
[...]
C:\Program Files\dotnet\packs\Microsoft.iOS.Windows.Sdk.net8.0_17.5\17.5.8030\tools\msbuild\iOS\Xamarin.iOS.Common.After.targets(364,3): [xma][err]: An exception occurred in the task 'ILLink'
C:\Program Files\dotnet\packs\Microsoft.iOS.Windows.Sdk.net8.0_17.5\17.5.8030\tools\msbuild\iOS\Xamarin.iOS.Common.After.targets(364,3): The post for client build1460814608Ilian on topic xvs/build/1.14.0.6/execute-task/ecacau/de6ed16002fILLink has been cancelled
at Xamarin.Messaging.Client.MessagingClient.PostAsync[TRequest,TResponse](TRequest message, String topic, MessagePriority priority, CancellationToken cancellationToken, Boolean retain, Int32 timeoutSecs) in D:\a\_work\1\s\src\Xamarin.Messaging.Client\MessagingClient.cs:line 231
at Xamarin.Messaging.Ssh.MessagingRunnerPro.ExecuteWithRetryAsync[TResult](Func`1 executeDelegate, IMessagingAnalyticsAction analytics, Int32 attempts) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingRunnerPro.cs:line 57
at Xamarin.Messaging.Ssh.MessagingRunnerPro.ThrowIfConnected(ExceptionDispatchInfo exceptionInfo, IMessagingAnalyticsAction analytics) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingRunnerPro.cs:line 149
at Xamarin.Messaging.Ssh.MessagingRunnerPro.HandleExceptionAsync[TResult](ExceptionDispatchInfo exceptionInfo, Func`1 reentrancyDelegate, IMessagingAnalyticsAction analytics, Int32 attempts) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingRunnerPro.cs:line 97
at Xamarin.Messaging.Ssh.MessagingRunnerPro.ExecuteWithRetryAsync[TResult](Func`1 executeDelegate, IMessagingAnalyticsAction analytics, Int32 attempts) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingRunnerPro.cs:line 64
at Xamarin.Messaging.Ssh.MessagingRunnerPro.HandleExceptionAsync[TResult](ExceptionDispatchInfo exceptionInfo, Func`1 reentrancyDelegate, IMessagingAnalyticsAction analytics, Int32 attempts) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingRunnerPro.cs:line 103
at Xamarin.Messaging.Ssh.MessagingRunnerPro.ExecuteWithRetryAsync[TResult](Func`1 executeDelegate, IMessagingAnalyticsAction analytics, Int32 attempts) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingRunnerPro.cs:line 64
at Xamarin.Messaging.Ssh.MessagingRunnerPro.ExecuteWithRetryAsync[TResult](Func`1 executeDelegate, Int32 attempts) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingRunnerPro.cs:line 39
at Xamarin.Messaging.Ssh.MessagingClientPro.PostAsync[TMessage,TResult](TMessage request, CancellationToken cancellationToken, Boolean retain, Int32 timeoutSecs) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingClientPro.cs:line 144
at Xamarin.Messaging.Build.Client.BuildClient.RunMessagingAsync[TMessage,TResult](TMessage message, Int32 timeoutSecs) in D:\a\_work\1\s\src\MSBuild\Xamarin.Messaging.Build.Client\BuildClient.cs:line 293
at Xamarin.Messaging.Build.Client.BuildClient.ExecuteTaskAsync(String task, String inputs) in D:\a\_work\1\s\src\MSBuild\Xamarin.Messaging.Build.Client\BuildClient.cs:line 65
at Xamarin.Messaging.Build.Client.TaskRunner.RunAsync(Task task) in D:\a\_work\1\s\src\MSBuild\Xamarin.Messaging.Build.Client\TaskRunner.cs:line 56
Errors
C:\Program Files\dotnet\packs\Microsoft.iOS.Windows.Sdk.net8.0_17.5\17.5.8030\tools\msbuild\iOS\Xamarin.iOS.Common.After.targets(364,3): MessagingException: The post for client build1460814608Ilian on topic xvs/build/1.14.0.6/execute-task/ecacau/de6ed16002fILLink has been cancelled
OperationCanceledException: The operation was canceled.
[sampleproj.csproj]
C:\Program Files\dotnet\packs\Microsoft.iOS.Windows.Sdk.net8.0_17.5\17.5.8030\tools\msbuild\iOS\Xamarin.iOS.Common.After.targets(364,3): error MSB4018: The "Xamarin.MacDev.Tasks.ILLink" task failed unexpectedly.
System.AggregateException: One or more errors occurred. (One or more errors occurred. (An error occurred while executing the operation and the connection could not be reestablished))
---> System.AggregateException: One or more errors occurred. (An error occurred while executing the operation and the connection could not be reestablished)
---> Xamarin.Messaging.Exceptions.MessagingException: An error occurred while executing the operation and the connection could not be reestablished
---> Xamarin.Messaging.Exceptions.ClientDisconnectedException: The client build1460814608Ilian has been disconnected while waiting a post response to topic xma/agents
at Xamarin.Messaging.Client.MessagingClient.PostAsync[TRequest,TResponse](TRequest message, String topic, MessagePriority priority, CancellationToken cancellationToken, Boolean retain, Int32 timeoutSecs) in D:\a\_work\1\s\src\Xamarin.Messaging.Client\MessagingClient.cs:line 197
at Xamarin.Messaging.Ssh.MessagingRunnerPro.ExecuteWithRetryAsync[TResult](Func`1 executeDelegate, IMessagingAnalyticsAction analytics, Int32 attempts) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingRunnerPro.cs:line 57
--- End of inner exception stack trace ---
at Xamarin.Messaging.Ssh.MessagingRunnerPro.ReconnectAsync(ExceptionDispatchInfo exceptionInfo, IMessagingAnalyticsAction analytics) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingRunnerPro.cs:line 182
at Xamarin.Messaging.Ssh.MessagingRunnerPro.HandleExceptionAsync[TResult](ExceptionDispatchInfo exceptionInfo, Func`1 reentrancyDelegate, IMessagingAnalyticsAction analytics, Int32 attempts) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingRunnerPro.cs:line 99
at Xamarin.Messaging.Ssh.MessagingRunnerPro.ExecuteWithRetryAsync[TResult](Func`1 executeDelegate, IMessagingAnalyticsAction analytics, Int32 attempts) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingRunnerPro.cs:line 64
at Xamarin.Messaging.Ssh.MessagingRunnerPro.ExecuteWithRetryAsync[TResult](Func`1 executeDelegate, Int32 attempts) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingRunnerPro.cs:line 39
at Xamarin.Messaging.Ssh.MessagingClientPro.PostAsync[TMessage,TResult](TMessage request, Boolean retain, Int32 timeoutSecs) in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingClientPro.cs:line 135
at Xamarin.Messaging.Ssh.MessagingService.RefreshAgentsStatusAsync() in D:\a\_work\1\s\src\Xamarin.Messaging.Ssh\MessagingService.cs:line 298
at Xamarin.Messaging.Build.Client.BuildConnection.GetBuildAgentStatusAsync() in D:\a\_work\1\s\src\MSBuild\Xamarin.Messaging.Build.Client\BuildConnection.Normal.cs:line 435
at Xamarin.Messaging.Build.Client.BuildConnection.IsBuildAgentRunningAsync() in D:\a\_work\1\s\src\MSBuild\Xamarin.Messaging.Build.Client\BuildConnection.Normal.cs:line 92
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at Xamarin.Messaging.Build.Client.BuildConnection.get_IsConnected() in D:\a\_work\1\s\src\MSBuild\Xamarin.Messaging.Build.Client\BuildConnection.Normal.cs:line 45
at Xamarin.Messaging.Build.Client.BuildConnection.GetAsync(IBuildEngine4 engine) in D:\a\_work\1\s\src\MSBuild\Xamarin.Messaging.Build.Client\BuildConnection.Static.cs:line 50
at Xamarin.Messaging.Build.Client.TaskRunner.DisconnectAsync(Task task) in D:\a\_work\1\s\src\MSBuild\Xamarin.Messaging.Build.Client\TaskRunner.cs:line 541
at Xamarin.Messaging.Build.Client.TaskRunner.RunAsync(Task task) in D:\a\_work\1\s\src\MSBuild\Xamarin.Messaging.Build.Client\TaskRunner.cs:line 99
--- End of inner exception stack trace ---
at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
at Xamarin.MacDev.Tasks.ILLink.Execute() in /Users/builder/azdo/_work/1/s/xamarin-macios/msbuild/Xamarin.MacDev.Tasks/Tasks/ILLink.cs:line 30
at Microsoft.Build.BackEnd.TaskExecutionHost.Execute()
at Microsoft.Build.BackEnd.TaskBuilder.ExecuteInstantiatedTask(TaskExecutionHost taskExecutionHost, TaskLoggingContext taskLoggingContext, TaskHost taskHost, ItemBucket bucket, TaskExecutionMode howToExecuteTask)
Messages
[...]
Task "Touch" skipped, due to false condition; ( '$(_ILLinkExitCode)' == '0' ) was evaluated as ( '' == '0' ).
(and build kept going, eventually failing later on because ILLink didn't run correctly)
Ref: https://developercommunity.visualstudio.com/t/Maui-Blazor-Hybrid-App-wont-publish-to-/10750311#T-ND10763338
15348e0ff3