Our mongod (single server instance) crashes often (but not always) after running a nightly backup with mongodump. The mongodump command executes succesfully, but after that new connections fail (connection timeout). The only thing we can do is to restart the server.

Some information:

• There is no information in de log files (the last entry is the connection of the backup user)
• The application mainly uses one collection with about 500.000 documents
• The problem occurs since there is traffic on the application, there wasn't a problem before that. During the run of mongodump there are concurrent reads from the database
• We did try a database repair a couple of times, but this didn't help
• The only this we changed in de default configuration is that we turned authentication on