Hey MongoDB Team.

I’m getting an issues on the production environment about the following:

System.InvalidOperationException: Thread static buffer is already in use. at MongoDB.Bson.IO.ThreadStaticBuffer.RentBuffer(Int32 size) at MongoDB.Bson.IO.EncodingHelper.GetBytesUsingThreadStaticBuffer(Encoding encoding, String value).

This exception came from different places:
MongoDB.Bson.IO.ByteBufferStream.WriteString(String value, UTF8Encoding encoding)
MongoDB.Bson.IO.BsonTrie1.Add(String elementName, TValue value) MongoDB.Bson.IO.BsonTrie1.TryGetValue(String elementName, TValue& value)

Whenever my web app gets that exception then the thread can not process anymore until I restart my web app.

I have a look at the source
mongo-csharp-driver/src/MongoDB.Bson/IO/EncodingHelper.cs at master · mongodb/mongo-csharp-driver (github.com)
and look like the exception came from this

image702×479 11.4 KB

Could you give me some insight about what might be causing the issue?
I’m using MongoDB Driver 2.18 and my web app still had a lot of RAM when I got that issue.

Thanks in advance.