[Bug] System.ObjectDisposedException at AzureMaintenanceEvent.cs

[pmg007]

Hi,

The library seems to have an issue at https://github.com/StackExchange/StackExchange.Redis/blob/main/src/StackExchange.Redis/Maintenance/AzureMaintenanceEvent.cs

This causes service to crash and dump creations. This exception arises within the library, and not our application code.

System.ObjectDisposedException: Cannot access a disposed object.
Object name: '<removed>(SE.Redis-v2.7.10.12442)'.
   at StackExchange.Redis.ConnectionMultiplexer.ExecuteSyncImpl[T](Message message, ResultProcessor`1 processor, ServerEndPoint server, T defaultValue) in /_/src/StackExchange.Redis/ConnectionMultiplexer.cs:line 2099
   at StackExchange.Redis.ConnectionMultiplexer.EnsureSubscriptions(CommandFlags flags) in /_/src/StackExchange.Redis/RedisSubscriber.cs:line 137
   at StackExchange.Redis.ConnectionMultiplexer.<ReconfigureAsync>d__139.MoveNext() in /_/src/StackExchange.Redis/ConnectionMultiplexer.cs:line 1725
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at StackExchange.Redis.Maintenance.AzureMaintenanceEvent.<>c__DisplayClass2_0.<<AddListenerAsync>b__0>d.MoveNext() in /_/src/StackExchange.Redis/Maintenance/AzureMaintenanceEvent.cs:line 143
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()(wrapped: ObjectDisposedException/Cannot access a disposed object.
Object name: '<removed>(SE.Redis-v2.7.10.12442)'.)

[mgravell]

Investigating, thanks