It appears that there is a state management issue in ServerMonitor.
When the target replicaset is failing over, one of the threads fails with NullReferenceException, see exception callstack below:
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System.NullReferenceException: Object reference not set to an instance of an object. void MongoDB.Driver.Core.Servers.ServerMonitor.CancelCurrentCheck() void MongoDB.Driver.Core.Servers.Server.HandleBeforeHandshakeCompletesException(IConnection connection, Exception ex) IChannelHandle MongoDB.Driver.Core.Servers.Server.GetChannel(CancellationToken cancellationToken) IChannelHandle MongoDB.Driver.Core.Bindings.ServerChannelSource.GetChannel(CancellationToken cancellationToken) IChannelHandle MongoDB.Driver.Core.Bindings.ChannelSourceHandle.GetChannel(CancellationToken cancellationToken) RetryableReadContext MongoDB.Driver.Core.Operations.RetryableReadContext.Create(IReadBinding binding, bool retryRequested, CancellationToken cancellationToken) IAsyncCursor<TDocument> MongoDB.Driver.Core.Operations.FindOperation<TDocument>.Execute(IReadBinding binding, CancellationToken cancellationToken) TResult MongoDB.Driver.OperationExecutor.ExecuteReadOperation<TResult>(IReadBinding binding, IReadOperation<TResult> operation, CancellationToken cancellationToken) TResult MongoDB.Driver.MongoCollectionImpl<TDocument>.ExecuteReadOperation<TResult>(IClientSessionHandle session, IReadOperation<TResult> operation, ReadPreference readPreference, CancellationToken cancellationToken) TResult MongoDB.Driver.MongoCollectionImpl<TDocument>.ExecuteReadOperation<TResult>(IClientSessionHandle session, IReadOperation<TResult> operation, CancellationToken cancellationToken) IAsyncCursor<TProjection> MongoDB.Driver.MongoCollectionImpl<TDocument>.FindSync<TProjection>(IClientSessionHandle session, FilterDefinition<TDocument> filter, FindOptions<TDocument, TProjection> options, CancellationToken cancellationToken) IAsyncCursor<TProjection> MongoDB.Driver.MongoCollectionImpl<TDocument>.FindSync<TProjection>(IClientSessionHandle session, FilterDefinition<TDocument> filter, FindOptions<TDocument, TProjection> options, CancellationToken cancellationToken)+(IClientSessionHandle session) => { } TResult MongoDB.Driver.MongoCollectionImpl<TDocument>.UsingImplicitSession<TResult>(Func<IClientSessionHandle, TResult> func, CancellationToken cancellationToken) IAsyncCursor<TProjection> MongoDB.Driver.MongoCollectionImpl<TDocument>.FindSync<TProjection>(FilterDefinition<TDocument> filter, FindOptions<TDocument, TProjection> options, CancellationToken cancellationToken)
While I don't have debug symbols with line numbers (and optimized/JITted code would not indicate the target line with 100% certainty), I believe the Dispose call is the culprit here.
- duplicates
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CSHARP-3188 Research timeout exception handling on server level
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- Closed
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