WARNING: DATA RACE
Read at 0x00001232ca80 by goroutine 4647:
  github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl.newTransferContext()
      github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl/conn_migration.go:49 +0x31
  github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl.(*forwarder).TransferConnection()
      github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl/conn_migration.go:149 +0x11b
  github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl/balancer.(*Balancer).processQueue.func1.1()
      github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl/balancer/balancer.go:371 +0x267
  github.com/cockroachdb/cockroach/pkg/util/stop.(*Stopper).RunAsyncTaskEx.func2()
      github.com/cockroachdb/cockroach/pkg/util/stop/stopper.go:480 +0x262

Previous write at 0x00001232ca80 by goroutine 4644:
  reflect.typedmemmove()
      GOROOT/src/runtime/mbarrier.go:203 +0x0
  reflect.Value.Set()
      GOROOT/src/reflect/value.go:2330 +0x184
  github.com/cockroachdb/cockroach/pkg/testutils.TestingHook.func1()
      github.com/cockroachdb/cockroach/pkg/testutils/hook.go:18 +0x70
  runtime.deferreturn()
      GOROOT/src/runtime/panic.go:602 +0x5d
  testing.tRunner()
      GOROOT/src/testing/testing.go:1689 +0x21e
  testing.(*T).Run.gowrap1()
      GOROOT/src/testing/testing.go:1742 +0x44

Goroutine 4647 (running) created at:
  github.com/cockroachdb/cockroach/pkg/util/stop.(*Stopper).RunAsyncTaskEx()
      github.com/cockroachdb/cockroach/pkg/util/stop/stopper.go:471 +0x69c
  github.com/cockroachdb/cockroach/pkg/util/stop.(*Stopper).RunAsyncTask()
      github.com/cockroachdb/cockroach/pkg/util/stop/stopper.go:342 +0x1ef
  github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl/balancer.(*Balancer).processQueue.func1()
      github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl/balancer/balancer.go:363 +0xc0
  github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl/balancer.(*Balancer).processQueue()
      github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl/balancer/balancer.go:386 +0xa5
  github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl/balancer.(*Balancer).processQueue-fm()
      <autogenerated>:1 +0x47
  github.com/cockroachdb/cockroach/pkg/util/stop.(*Stopper).RunAsyncTaskEx.func2()
      github.com/cockroachdb/cockroach/pkg/util/stop/stopper.go:480 +0x262

Goroutine 4644 (finished) created at:
  testing.(*T).Run()
      GOROOT/src/testing/testing.go:1742 +0x825
  github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl.TestCancelQuery()
      github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl/proxy_handler_test.go:1719 +0x1cde
  testing.tRunner()
      GOROOT/src/testing/testing.go:1689 +0x21e
  testing.(*T).Run.gowrap1()
      GOROOT/src/testing/testing.go:1742 +0x44
==================
=== RUN   TestCancelQuery/cancel_after_migrating_a_session