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clientv3: fix racy writes to context key

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=== RUN   TestWatchOverlapContextCancel

==================

WARNING: DATA RACE

Write at 0x00c42110dd40 by goroutine 99:

  runtime.mapassign()

      /usr/local/go/src/runtime/hashmap.go:485 +0x0

  github.com/coreos/etcd/clientv3.metadataSet()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/ctx.go:61 +0x8c

  github.com/coreos/etcd/clientv3.withVersion()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/ctx.go:47 +0x137

  github.com/coreos/etcd/clientv3.newStreamClientInterceptor.func1()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/client.go:309 +0x81

  google.golang.org/grpc.NewClientStream()

      /go/src/github.com/coreos/etcd/gopath/src/google.golang.org/grpc/stream.go:101 +0x10e

  github.com/coreos/etcd/etcdserver/etcdserverpb.(*watchClient).Watch()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/etcdserver/etcdserverpb/rpc.pb.go:3193 +0xe9

  github.com/coreos/etcd/clientv3.(*watchGrpcStream).openWatchClient()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/watch.go:788 +0x143

  github.com/coreos/etcd/clientv3.(*watchGrpcStream).newWatchClient()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/watch.go:700 +0x5c3

  github.com/coreos/etcd/clientv3.(*watchGrpcStream).run()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/watch.go:431 +0x12b

Previous read at 0x00c42110dd40 by goroutine 130:

  reflect.maplen()

      /usr/local/go/src/runtime/hashmap.go:1165 +0x0

  reflect.Value.MapKeys()

      /usr/local/go/src/reflect/value.go:1090 +0x43b

  fmt.(*pp).printValue()

      /usr/local/go/src/fmt/print.go:741 +0x1885

  fmt.(*pp).printArg()

      /usr/local/go/src/fmt/print.go:682 +0x1b1

  fmt.(*pp).doPrintf()

      /usr/local/go/src/fmt/print.go:998 +0x1cad

  fmt.Sprintf()

      /usr/local/go/src/fmt/print.go:196 +0x77

  github.com/coreos/etcd/clientv3.streamKeyFromCtx()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/watch.go:825 +0xc8

  github.com/coreos/etcd/clientv3.(*watcher).Watch()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/watch.go:265 +0x426

  github.com/coreos/etcd/clientv3/integration.testWatchOverlapContextCancel.func1()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/integration/watch_test.go:959 +0x23e

Goroutine 99 (running) created at:

  github.com/coreos/etcd/clientv3.(*watcher).newWatcherGrpcStream()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/watch.go:236 +0x59d

  github.com/coreos/etcd/clientv3.(*watcher).Watch()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/watch.go:278 +0xbb6

  github.com/coreos/etcd/clientv3/integration.testWatchOverlapContextCancel.func1()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/integration/watch_test.go:959 +0x23e

Goroutine 130 (running) created at:

  github.com/coreos/etcd/clientv3/integration.testWatchOverlapContextCancel()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/integration/watch_test.go:979 +0x76d

  github.com/coreos/etcd/clientv3/integration.TestWatchOverlapContextCancel()

      /go/src/github.com/coreos/etcd/gopath/src/github.com/coreos/etcd/clientv3/integration/watch_test.go:922 +0x44

  testing.tRunner()

      /usr/local/go/src/testing/testing.go:657 +0x107

==================

Signed-off-by: Gyuho Lee <leegyuho@amazon.com>
This commit is contained in:
Gyuho Lee 2020-03-18 17:05:05 -07:00
parent bf883bd15b
commit eeb371b7c1
1 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
clientv3/ctx.go
View File

@ -30,9 +30,10 @@ func WithRequireLeader(ctx context.Context) context.Context {
md = metadata.Pairs(rpctypes.MetadataRequireLeaderKey, rpctypes.MetadataHasLeader)
return metadata.NewOutgoingContext(ctx, md)
}
copied := md.Copy() // avoid racey updates
// overwrite/add 'hasleader' key/value
md.Set(rpctypes.MetadataRequireLeaderKey, rpctypes.MetadataHasLeader)
return metadata.NewOutgoingContext(ctx, md)
copied.Set(rpctypes.MetadataRequireLeaderKey, rpctypes.MetadataHasLeader)
return metadata.NewOutgoingContext(ctx, copied)
}
// embeds client version
@ -42,7 +43,8 @@ func withVersion(ctx context.Context) context.Context {
md = metadata.Pairs(rpctypes.MetadataClientAPIVersionKey, version.APIVersion)
return metadata.NewOutgoingContext(ctx, md)
}
copied := md.Copy() // avoid racey updates
// overwrite/add version key/value
md.Set(rpctypes.MetadataClientAPIVersionKey, version.APIVersion)
return metadata.NewOutgoingContext(ctx, md)
copied.Set(rpctypes.MetadataClientAPIVersionKey, version.APIVersion)
return metadata.NewOutgoingContext(ctx, copied)
}