ncabatoff opened a new issue, #1473:
URL: https://github.com/apache/cassandra-gocql-driver/issues/1473
Please answer these questions before submitting your issue. Thanks!
### What version of Cassandra are you using?
Docker image cassandra:3.11.
### What version of Gocql are you using?
```
$ grep gocql go.mod
github.com/gocql/gocql v0.0.0-20200624222514-34081eda590e
```
### What did you do?
```
sess, err := cluster.CreateSession()
if err != nil {
return nil, err
}
sess.SetConsistency(consistency)
```
Elsewhere:
```
sess.Query(...)
```
### What did you expect to see?
No data race when running with `-race`.
### What did you see instead?
```
=== FAIL: physical/cassandra TestCassandraBackend (25.07s)
==================
WARNING: DATA RACE
Read at 0x00c0001d8380 by goroutine 25:
github.com/hashicorp/vault/vendor/github.com/gocql/gocql.(*Conn).UseKeyspace()
/go/src/github.com/hashicorp/vault/vendor/github.com/gocql/gocql/conn.go:1235
+0x186
github.com/hashicorp/vault/vendor/github.com/gocql/gocql.(*hostConnPool).connect()
/go/src/github.com/hashicorp/vault/vendor/github.com/gocql/gocql/connectionpool.go:534
+0x53d
github.com/hashicorp/vault/vendor/github.com/gocql/gocql.(*hostConnPool).connectMany.func1()
/go/src/github.com/hashicorp/vault/vendor/github.com/gocql/gocql/connectionpool.go:487
+0x79
Previous write at 0x00c0001d8380 by goroutine 7:
github.com/hashicorp/vault/vendor/github.com/gocql/gocql.(*Session).SetConsistency()
/go/src/github.com/hashicorp/vault/vendor/github.com/gocql/gocql/session.go:336
+0x54
github.com/hashicorp/vault/physical/cassandra.NewCassandraBackend()
/go/src/github.com/hashicorp/vault/physical/cassandra/cassandra.go:144
+0x917
github.com/hashicorp/vault/physical/cassandra.TestCassandraBackend()
/go/src/github.com/hashicorp/vault/physical/cassandra/cassandra_test.go:29
+0x2dc
testing.tRunner()
/usr/local/go/src/testing/testing.go:1039 +0x1eb
Goroutine 25 (running) created at:
github.com/hashicorp/vault/vendor/github.com/gocql/gocql.(*hostConnPool).connectMany()
/go/src/github.com/hashicorp/vault/vendor/github.com/gocql/gocql/connectionpool.go:485
+0x159
github.com/hashicorp/vault/vendor/github.com/gocql/gocql.(*hostConnPool).fill.func1()
/go/src/github.com/hashicorp/vault/vendor/github.com/gocql/gocql/connectionpool.go:439
+0x42
Goroutine 7 (running) created at:
testing.(*T).Run()
/usr/local/go/src/testing/testing.go:1090 +0x700
testing.runTests.func1()
/usr/local/go/src/testing/testing.go:1334 +0xa6
testing.tRunner()
/usr/local/go/src/testing/testing.go:1039 +0x1eb
testing.runTests()
/usr/local/go/src/testing/testing.go:1332 +0x527
testing.(*M).Run()
/usr/local/go/src/testing/testing.go:1249 +0x43f
main.main()
_testmain.go:46 +0x223
```
---
To reproduce, clone `github.com/hashicorp/vault`, then:
```
go test -race ./physical/cassandra
```
The issue looks to be that although `Session.SetConsistency` uses a lock to
protect writes to `s.cons`, `Conn.UseKeyscape` reads `c.session.cons` without
any mechanism to manage thread safety.
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