use of closed network connection error

[waichee]

Issue description

We are seeing a few instances of the following errors when using the MySQL driver with sqlx

 write tcp <some_ip>-><some_ip>3306: use of closed network connection

Under what situations would this error be thrown? Is this expected?

Example code

	sqlDB := sqltrace.OpenDB(connector)
	sqlxDB := sqlx.NewDb(sqlDB, "mysql")
       var mystruct []MyStruct
        // query := a valid sql query
       err := conn.SelectContext(ctx, &mystruct, query) 

Error log

If you have an error log, please paste it here.

Configuration

Driver version (or git SHA): v1.5.0

Go version: run go version in your console 1.13.1

Server version: MySQL 5.7 (Aurora 2)

Server OS: Linux

[methane]

Any other errors before the error?

Other error can close the connection and leads this error. In this case, you should ignore this error and focus on the other errors.

[waichee]

ah right i see. Theres some context cancelled errors. So the context being closed potentially could results in concurrent queries to throw this error?

[methane]

So the context being closed potentially could results in concurrent queries to throw this error?

I don't know. If you want we investigate your issue, please provide a reproducible sample.