chore(deps): bump github.com/containerd/containerd from 1.6.18 to 1.7.13 (#6102)

Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io>

vendor/go.opentelemetry.io/otel/sdk/trace/batch_span_processor.go

@@ -16,7 +16,6 @@ package trace // import "go.opentelemetry.io/otel/sdk/trace"
 
 import (
 	"context"
-	"runtime"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -84,6 +83,7 @@ type batchSpanProcessor struct {
 	stopWait   sync.WaitGroup
 	stopOnce   sync.Once
 	stopCh     chan struct{}
+	stopped    atomic.Bool
 }
 
 var _ SpanProcessor = (*batchSpanProcessor)(nil)
@@ -91,7 +91,7 @@ var _ SpanProcessor = (*batchSpanProcessor)(nil)
 // NewBatchSpanProcessor creates a new SpanProcessor that will send completed
 // span batches to the exporter with the supplied options.
 //
-// If the exporter is nil, the span processor will preform no action.
+// If the exporter is nil, the span processor will perform no action.
 func NewBatchSpanProcessor(exporter SpanExporter, options ...BatchSpanProcessorOption) SpanProcessor {
 	maxQueueSize := env.BatchSpanProcessorMaxQueueSize(DefaultMaxQueueSize)
 	maxExportBatchSize := env.BatchSpanProcessorMaxExportBatchSize(DefaultMaxExportBatchSize)
@@ -137,6 +137,11 @@ func (bsp *batchSpanProcessor) OnStart(parent context.Context, s ReadWriteSpan)
 
 // OnEnd method enqueues a ReadOnlySpan for later processing.
 func (bsp *batchSpanProcessor) OnEnd(s ReadOnlySpan) {
+	// Do not enqueue spans after Shutdown.
+	if bsp.stopped.Load() {
+		return
+	}
+
 	// Do not enqueue spans if we are just going to drop them.
 	if bsp.e == nil {
 		return
@@ -149,6 +154,7 @@ func (bsp *batchSpanProcessor) OnEnd(s ReadOnlySpan) {
 func (bsp *batchSpanProcessor) Shutdown(ctx context.Context) error {
 	var err error
 	bsp.stopOnce.Do(func() {
+		bsp.stopped.Store(true)
 		wait := make(chan struct{})
 		go func() {
 			close(bsp.stopCh)
@@ -181,11 +187,24 @@ func (f forceFlushSpan) SpanContext() trace.SpanContext {
 
 // ForceFlush exports all ended spans that have not yet been exported.
 func (bsp *batchSpanProcessor) ForceFlush(ctx context.Context) error {
+	// Interrupt if context is already canceled.
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+
+	// Do nothing after Shutdown.
+	if bsp.stopped.Load() {
+		return nil
+	}
+
 	var err error
 	if bsp.e != nil {
 		flushCh := make(chan struct{})
 		if bsp.enqueueBlockOnQueueFull(ctx, forceFlushSpan{flushed: flushCh}) {
 			select {
+			case <-bsp.stopCh:
+				// The batchSpanProcessor is Shutdown.
+				return nil
 			case <-flushCh:
 				// Processed any items in queue prior to ForceFlush being called
 			case <-ctx.Done():
@@ -326,11 +345,9 @@ func (bsp *batchSpanProcessor) drainQueue() {
 	for {
 		select {
 		case sd := <-bsp.queue:
-			if sd == nil {
-				if err := bsp.exportSpans(ctx); err != nil {
-					otel.Handle(err)
-				}
-				return
+			if _, ok := sd.(forceFlushSpan); ok {
+				// Ignore flush requests as they are not valid spans.
+				continue
 			}
 
 			bsp.batchMutex.Lock()
@@ -344,7 +361,11 @@ func (bsp *batchSpanProcessor) drainQueue() {
 				}
 			}
 		default:
-			close(bsp.queue)
+			// There are no more enqueued spans. Make final export.
+			if err := bsp.exportSpans(ctx); err != nil {
+				otel.Handle(err)
+			}
+			return
 		}
 	}
 }
@@ -358,34 +379,11 @@ func (bsp *batchSpanProcessor) enqueue(sd ReadOnlySpan) {
 	}
 }
 
-func recoverSendOnClosedChan() {
-	x := recover()
-	switch err := x.(type) {
-	case nil:
-		return
-	case runtime.Error:
-		if err.Error() == "send on closed channel" {
-			return
-		}
-	}
-	panic(x)
-}
-
 func (bsp *batchSpanProcessor) enqueueBlockOnQueueFull(ctx context.Context, sd ReadOnlySpan) bool {
 	if !sd.SpanContext().IsSampled() {
 		return false
 	}
 
-	// This ensures the bsp.queue<- below does not panic as the
-	// processor shuts down.
-	defer recoverSendOnClosedChan()
-
-	select {
-	case <-bsp.stopCh:
-		return false
-	default:
-	}
-
 	select {
 	case bsp.queue <- sd:
 		return true
@@ -399,16 +397,6 @@ func (bsp *batchSpanProcessor) enqueueDrop(ctx context.Context, sd ReadOnlySpan)
 		return false
 	}
 
-	// This ensures the bsp.queue<- below does not panic as the
-	// processor shuts down.
-	defer recoverSendOnClosedChan()
-
-	select {
-	case <-bsp.stopCh:
-		return false
-	default:
-	}
-
 	select {
 	case bsp.queue <- sd:
 		return true
@@ -418,7 +406,7 @@ func (bsp *batchSpanProcessor) enqueueDrop(ctx context.Context, sd ReadOnlySpan)
 	return false
 }
 
-// MarshalLog is the marshaling function used by the logging system to represent this exporter.
+// MarshalLog is the marshaling function used by the logging system to represent this Span Processor.
 func (bsp *batchSpanProcessor) MarshalLog() interface{} {
 	return struct {
 		Type         string

vendor/go.opentelemetry.io/otel/sdk/trace/provider.go

@@ -25,6 +25,8 @@ import (
 	"go.opentelemetry.io/otel/sdk/instrumentation"
 	"go.opentelemetry.io/otel/sdk/resource"
 	"go.opentelemetry.io/otel/trace"
+	"go.opentelemetry.io/otel/trace/embedded"
+	"go.opentelemetry.io/otel/trace/noop"
 )
 
 const (
@@ -53,7 +55,7 @@ type tracerProviderConfig struct {
 	resource *resource.Resource
 }
 
-// MarshalLog is the marshaling function used by the logging system to represent this exporter.
+// MarshalLog is the marshaling function used by the logging system to represent this Provider.
 func (cfg tracerProviderConfig) MarshalLog() interface{} {
 	return struct {
 		SpanProcessors  []SpanProcessor
@@ -73,9 +75,13 @@ func (cfg tracerProviderConfig) MarshalLog() interface{} {
 // TracerProvider is an OpenTelemetry TracerProvider. It provides Tracers to
 // instrumentation so it can trace operational flow through a system.
 type TracerProvider struct {
+	embedded.TracerProvider
+
 	mu             sync.Mutex
 	namedTracer    map[instrumentation.Scope]*tracer
-	spanProcessors atomic.Value
+	spanProcessors atomic.Pointer[spanProcessorStates]
+
+	isShutdown atomic.Bool
 
 	// These fields are not protected by the lock mu. They are assumed to be
 	// immutable after creation of the TracerProvider.
@@ -118,11 +124,11 @@ func NewTracerProvider(opts ...TracerProviderOption) *TracerProvider {
 	}
 	global.Info("TracerProvider created", "config", o)
 
-	spss := spanProcessorStates{}
+	spss := make(spanProcessorStates, 0, len(o.processors))
 	for _, sp := range o.processors {
 		spss = append(spss, newSpanProcessorState(sp))
 	}
-	tp.spanProcessors.Store(spss)
+	tp.spanProcessors.Store(&spss)
 
 	return tp
 }
@@ -135,10 +141,11 @@ func NewTracerProvider(opts ...TracerProviderOption) *TracerProvider {
 //
 // This method is safe to be called concurrently.
 func (p *TracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.Tracer {
+	// This check happens before the mutex is acquired to avoid deadlocking if Tracer() is called from within Shutdown().
+	if p.isShutdown.Load() {
+		return noop.NewTracerProvider().Tracer(name, opts...)
+	}
 	c := trace.NewTracerConfig(opts...)
-
-	p.mu.Lock()
-	defer p.mu.Unlock()
 	if name == "" {
 		name = defaultTracerName
 	}
@@ -147,38 +154,74 @@ func (p *TracerProvider) Tracer(name string, opts ...trace.TracerOption) trace.T
 		Version:   c.InstrumentationVersion(),
 		SchemaURL: c.SchemaURL(),
 	}
-	t, ok := p.namedTracer[is]
-	if !ok {
-		t = &tracer{
-			provider:             p,
-			instrumentationScope: is,
+
+	t, ok := func() (trace.Tracer, bool) {
+		p.mu.Lock()
+		defer p.mu.Unlock()
+		// Must check the flag after acquiring the mutex to avoid returning a valid tracer if Shutdown() ran
+		// after the first check above but before we acquired the mutex.
+		if p.isShutdown.Load() {
+			return noop.NewTracerProvider().Tracer(name, opts...), true
 		}
-		p.namedTracer[is] = t
-		global.Info("Tracer created", "name", name, "version", c.InstrumentationVersion(), "schemaURL", c.SchemaURL())
+		t, ok := p.namedTracer[is]
+		if !ok {
+			t = &tracer{
+				provider:             p,
+				instrumentationScope: is,
+			}
+			p.namedTracer[is] = t
+		}
+		return t, ok
+	}()
+	if !ok {
+		// This code is outside the mutex to not hold the lock while calling third party logging code:
+		// - That code may do slow things like I/O, which would prolong the duration the lock is held,
+		//   slowing down all tracing consumers.
+		// - Logging code may be instrumented with tracing and deadlock because it could try
+		//   acquiring the same non-reentrant mutex.
+		global.Info("Tracer created", "name", name, "version", is.Version, "schemaURL", is.SchemaURL)
 	}
 	return t
 }
 
 // RegisterSpanProcessor adds the given SpanProcessor to the list of SpanProcessors.
 func (p *TracerProvider) RegisterSpanProcessor(sp SpanProcessor) {
+	// This check prevents calls during a shutdown.
+	if p.isShutdown.Load() {
+		return
+	}
 	p.mu.Lock()
 	defer p.mu.Unlock()
-	newSPS := spanProcessorStates{}
-	newSPS = append(newSPS, p.spanProcessors.Load().(spanProcessorStates)...)
+	// This check prevents calls after a shutdown.
+	if p.isShutdown.Load() {
+		return
+	}
+
+	current := p.getSpanProcessors()
+	newSPS := make(spanProcessorStates, 0, len(current)+1)
+	newSPS = append(newSPS, current...)
 	newSPS = append(newSPS, newSpanProcessorState(sp))
-	p.spanProcessors.Store(newSPS)
+	p.spanProcessors.Store(&newSPS)
 }
 
 // UnregisterSpanProcessor removes the given SpanProcessor from the list of SpanProcessors.
 func (p *TracerProvider) UnregisterSpanProcessor(sp SpanProcessor) {
+	// This check prevents calls during a shutdown.
+	if p.isShutdown.Load() {
+		return
+	}
 	p.mu.Lock()
 	defer p.mu.Unlock()
-	old := p.spanProcessors.Load().(spanProcessorStates)
+	// This check prevents calls after a shutdown.
+	if p.isShutdown.Load() {
+		return
+	}
+	old := p.getSpanProcessors()
 	if len(old) == 0 {
 		return
 	}
-	spss := spanProcessorStates{}
-	spss = append(spss, old...)
+	spss := make(spanProcessorStates, len(old))
+	copy(spss, old)
 
 	// stop the span processor if it is started and remove it from the list
 	var stopOnce *spanProcessorState
@@ -202,13 +245,13 @@ func (p *TracerProvider) UnregisterSpanProcessor(sp SpanProcessor) {
 	spss[len(spss)-1] = nil
 	spss = spss[:len(spss)-1]
 
-	p.spanProcessors.Store(spss)
+	p.spanProcessors.Store(&spss)
 }
 
 // ForceFlush immediately exports all spans that have not yet been exported for
 // all the registered span processors.
 func (p *TracerProvider) ForceFlush(ctx context.Context) error {
-	spss := p.spanProcessors.Load().(spanProcessorStates)
+	spss := p.getSpanProcessors()
 	if len(spss) == 0 {
 		return nil
 	}
@@ -227,15 +270,23 @@ func (p *TracerProvider) ForceFlush(ctx context.Context) error {
 	return nil
 }
 
-// Shutdown shuts down the span processors in the order they were registered.
+// Shutdown shuts down TracerProvider. All registered span processors are shut down
+// in the order they were registered and any held computational resources are released.
+// After Shutdown is called, all methods are no-ops.
 func (p *TracerProvider) Shutdown(ctx context.Context) error {
-	spss := p.spanProcessors.Load().(spanProcessorStates)
-	if len(spss) == 0 {
+	// This check prevents deadlocks in case of recursive shutdown.
+	if p.isShutdown.Load() {
+		return nil
+	}
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	// This check prevents calls after a shutdown has already been done concurrently.
+	if !p.isShutdown.CompareAndSwap(false, true) { // did toggle?
 		return nil
 	}
 
 	var retErr error
-	for _, sps := range spss {
+	for _, sps := range p.getSpanProcessors() {
 		select {
 		case <-ctx.Done():
 			return ctx.Err()
@@ -255,9 +306,14 @@ func (p *TracerProvider) Shutdown(ctx context.Context) error {
 			}
 		}
 	}
+	p.spanProcessors.Store(&spanProcessorStates{})
 	return retErr
 }
 
+func (p *TracerProvider) getSpanProcessors() spanProcessorStates {
+	return *(p.spanProcessors.Load())
+}
+
 // TracerProviderOption configures a TracerProvider.
 type TracerProviderOption interface {
 	apply(tracerProviderConfig) tracerProviderConfig

vendor/go.opentelemetry.io/otel/sdk/trace/sampling.go

@@ -81,7 +81,7 @@ type traceIDRatioSampler struct {
 
 func (ts traceIDRatioSampler) ShouldSample(p SamplingParameters) SamplingResult {
 	psc := trace.SpanContextFromContext(p.ParentContext)
-	x := binary.BigEndian.Uint64(p.TraceID[0:8]) >> 1
+	x := binary.BigEndian.Uint64(p.TraceID[8:16]) >> 1
 	if x < ts.traceIDUpperBound {
 		return SamplingResult{
 			Decision:   RecordAndSample,
@@ -158,15 +158,15 @@ func NeverSample() Sampler {
 	return alwaysOffSampler{}
 }
 
-// ParentBased returns a composite sampler which behaves differently,
+// ParentBased returns a sampler decorator which behaves differently,
 // based on the parent of the span. If the span has no parent,
-// the root(Sampler) is used to make sampling decision. If the span has
+// the decorated sampler is used to make sampling decision. If the span has
 // a parent, depending on whether the parent is remote and whether it
 // is sampled, one of the following samplers will apply:
-// - remoteParentSampled(Sampler) (default: AlwaysOn)
-// - remoteParentNotSampled(Sampler) (default: AlwaysOff)
-// - localParentSampled(Sampler) (default: AlwaysOn)
-// - localParentNotSampled(Sampler) (default: AlwaysOff)
+//   - remoteParentSampled(Sampler) (default: AlwaysOn)
+//   - remoteParentNotSampled(Sampler) (default: AlwaysOff)
+//   - localParentSampled(Sampler) (default: AlwaysOn)
+//   - localParentNotSampled(Sampler) (default: AlwaysOff)
 func ParentBased(root Sampler, samplers ...ParentBasedSamplerOption) Sampler {
 	return parentBased{
 		root:   root,

vendor/go.opentelemetry.io/otel/sdk/trace/simple_span_processor.go

@@ -19,12 +19,13 @@ import (
 	"sync"
 
 	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/internal/global"
 )
 
 // simpleSpanProcessor is a SpanProcessor that synchronously sends all
 // completed Spans to a trace.Exporter immediately.
 type simpleSpanProcessor struct {
-	exporterMu sync.RWMutex
+	exporterMu sync.Mutex
 	exporter   SpanExporter
 	stopOnce   sync.Once
 }
@@ -43,6 +44,8 @@ func NewSimpleSpanProcessor(exporter SpanExporter) SpanProcessor {
 	ssp := &simpleSpanProcessor{
 		exporter: exporter,
 	}
+	global.Warn("SimpleSpanProcessor is not recommended for production use, consider using BatchSpanProcessor instead.")
+
 	return ssp
 }
 
@@ -51,8 +54,8 @@ func (ssp *simpleSpanProcessor) OnStart(context.Context, ReadWriteSpan) {}
 
 // OnEnd immediately exports a ReadOnlySpan.
 func (ssp *simpleSpanProcessor) OnEnd(s ReadOnlySpan) {
-	ssp.exporterMu.RLock()
-	defer ssp.exporterMu.RUnlock()
+	ssp.exporterMu.Lock()
+	defer ssp.exporterMu.Unlock()
 
 	if ssp.exporter != nil && s.SpanContext().TraceFlags().IsSampled() {
 		if err := ssp.exporter.ExportSpans(context.Background(), []ReadOnlySpan{s}); err != nil {

vendor/go.opentelemetry.io/otel/sdk/trace/span.go

@@ -30,8 +30,9 @@ import (
 	"go.opentelemetry.io/otel/sdk/instrumentation"
 	"go.opentelemetry.io/otel/sdk/internal"
 	"go.opentelemetry.io/otel/sdk/resource"
-	semconv "go.opentelemetry.io/otel/semconv/v1.12.0"
+	semconv "go.opentelemetry.io/otel/semconv/v1.24.0"
 	"go.opentelemetry.io/otel/trace"
+	"go.opentelemetry.io/otel/trace/embedded"
 )
 
 // ReadOnlySpan allows reading information from the data structure underlying a
@@ -108,6 +109,8 @@ type ReadWriteSpan interface {
 // recordingSpan is an implementation of the OpenTelemetry Span API
 // representing the individual component of a trace that is sampled.
 type recordingSpan struct {
+	embedded.Span
+
 	// mu protects the contents of this span.
 	mu sync.Mutex
 
@@ -158,8 +161,10 @@ type recordingSpan struct {
 	tracer *tracer
 }
 
-var _ ReadWriteSpan = (*recordingSpan)(nil)
-var _ runtimeTracer = (*recordingSpan)(nil)
+var (
+	_ ReadWriteSpan = (*recordingSpan)(nil)
+	_ runtimeTracer = (*recordingSpan)(nil)
+)
 
 // SpanContext returns the SpanContext of this span.
 func (s *recordingSpan) SpanContext() trace.SpanContext {
@@ -203,6 +208,16 @@ func (s *recordingSpan) SetStatus(code codes.Code, description string) {
 	s.status = status
 }
 
+// ensureAttributesCapacity inlines functionality from slices.Grow
+// so that we can avoid needing to import golang.org/x/exp for go1.20.
+// Once support for go1.20 is dropped, we can use slices.Grow available since go1.21 instead.
+// Tracking issue: https://github.com/open-telemetry/opentelemetry-go/issues/4819.
+func (s *recordingSpan) ensureAttributesCapacity(minCapacity int) {
+	if n := minCapacity - cap(s.attributes); n > 0 {
+		s.attributes = append(s.attributes[:cap(s.attributes)], make([]attribute.KeyValue, n)...)[:len(s.attributes)]
+	}
+}
+
 // SetAttributes sets attributes of this span.
 //
 // If a key from attributes already exists the value associated with that key
@@ -237,6 +252,7 @@ func (s *recordingSpan) SetAttributes(attributes ...attribute.KeyValue) {
 
 	// Otherwise, add without deduplication. When attributes are read they
 	// will be deduplicated, optimizing the operation.
+	s.ensureAttributesCapacity(len(s.attributes) + len(attributes))
 	for _, a := range attributes {
 		if !a.Valid() {
 			// Drop all invalid attributes.
@@ -272,6 +288,12 @@ func (s *recordingSpan) addOverCapAttrs(limit int, attrs []attribute.KeyValue) {
 
 	// Now that s.attributes is deduplicated, adding unique attributes up to
 	// the capacity of s will not over allocate s.attributes.
+	if sum := len(attrs) + len(s.attributes); sum < limit {
+		// After support for go1.20 is dropped, simplify if-else to min(sum, limit).
+		s.ensureAttributesCapacity(sum)
+	} else {
+		s.ensureAttributesCapacity(limit)
+	}
 	for _, a := range attrs {
 		if !a.Valid() {
 			// Drop all invalid attributes.
@@ -302,7 +324,7 @@ func (s *recordingSpan) addOverCapAttrs(limit int, attrs []attribute.KeyValue) {
 // most a length of limit. Each string slice value is truncated in this fashion
 // (the slice length itself is unaffected).
 //
-// No truncation is perfromed for a negative limit.
+// No truncation is performed for a negative limit.
 func truncateAttr(limit int, attr attribute.KeyValue) attribute.KeyValue {
 	if limit < 0 {
 		return attr
@@ -383,14 +405,14 @@ func (s *recordingSpan) End(options ...trace.SpanEndOption) {
 		defer panic(recovered)
 		opts := []trace.EventOption{
 			trace.WithAttributes(
-				semconv.ExceptionTypeKey.String(typeStr(recovered)),
-				semconv.ExceptionMessageKey.String(fmt.Sprint(recovered)),
+				semconv.ExceptionType(typeStr(recovered)),
+				semconv.ExceptionMessage(fmt.Sprint(recovered)),
 			),
 		}
 
 		if config.StackTrace() {
 			opts = append(opts, trace.WithAttributes(
-				semconv.ExceptionStacktraceKey.String(recordStackTrace()),
+				semconv.ExceptionStacktrace(recordStackTrace()),
 			))
 		}
 
@@ -410,7 +432,7 @@ func (s *recordingSpan) End(options ...trace.SpanEndOption) {
 	}
 	s.mu.Unlock()
 
-	sps := s.tracer.provider.spanProcessors.Load().(spanProcessorStates)
+	sps := s.tracer.provider.getSpanProcessors()
 	if len(sps) == 0 {
 		return
 	}
@@ -430,14 +452,14 @@ func (s *recordingSpan) RecordError(err error, opts ...trace.EventOption) {
 	}
 
 	opts = append(opts, trace.WithAttributes(
-		semconv.ExceptionTypeKey.String(typeStr(err)),
-		semconv.ExceptionMessageKey.String(err.Error()),
+		semconv.ExceptionType(typeStr(err)),
+		semconv.ExceptionMessage(err.Error()),
 	))
 
 	c := trace.NewEventConfig(opts...)
 	if c.StackTrace() {
 		opts = append(opts, trace.WithAttributes(
-			semconv.ExceptionStacktraceKey.String(recordStackTrace()),
+			semconv.ExceptionStacktrace(recordStackTrace()),
 		))
 	}
 
@@ -772,6 +794,8 @@ func (s *recordingSpan) runtimeTrace(ctx context.Context) context.Context {
 // that wraps a SpanContext. It performs no operations other than to return
 // the wrapped SpanContext or TracerProvider that created it.
 type nonRecordingSpan struct {
+	embedded.Span
+
 	// tracer is the SDK tracer that created this span.
 	tracer *tracer
 	sc     trace.SpanContext

vendor/go.opentelemetry.io/otel/sdk/trace/span_exporter.go

@@ -38,7 +38,7 @@ type SpanExporter interface {
 	// must never be done outside of a new major release.
 
 	// Shutdown notifies the exporter of a pending halt to operations. The
-	// exporter is expected to preform any cleanup or synchronization it
+	// exporter is expected to perform any cleanup or synchronization it
 	// requires while honoring all timeouts and cancellations contained in
 	// the passed context.
 	Shutdown(ctx context.Context) error

vendor/go.opentelemetry.io/otel/sdk/trace/span_processor.go

@@ -62,11 +62,11 @@ type SpanProcessor interface {
 
 type spanProcessorState struct {
 	sp    SpanProcessor
-	state *sync.Once
+	state sync.Once
 }
 
 func newSpanProcessorState(sp SpanProcessor) *spanProcessorState {
-	return &spanProcessorState{sp: sp, state: &sync.Once{}}
+	return &spanProcessorState{sp: sp}
 }
 
 type spanProcessorStates []*spanProcessorState

vendor/go.opentelemetry.io/otel/sdk/trace/tracer.go

@@ -20,9 +20,12 @@ import (
 
 	"go.opentelemetry.io/otel/sdk/instrumentation"
 	"go.opentelemetry.io/otel/trace"
+	"go.opentelemetry.io/otel/trace/embedded"
 )
 
 type tracer struct {
+	embedded.Tracer
+
 	provider             *TracerProvider
 	instrumentationScope instrumentation.Scope
 }
@@ -51,7 +54,7 @@ func (tr *tracer) Start(ctx context.Context, name string, options ...trace.SpanS
 
 	s := tr.newSpan(ctx, name, &config)
 	if rw, ok := s.(ReadWriteSpan); ok && s.IsRecording() {
-		sps := tr.provider.spanProcessors.Load().(spanProcessorStates)
+		sps := tr.provider.getSpanProcessors()
 		for _, sp := range sps {
 			sp.sp.OnStart(ctx, rw)
 		}

vendor/go.opentelemetry.io/otel/sdk/trace/version.go

@@ -0,0 +1,20 @@
+// Copyright The OpenTelemetry Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package trace // import "go.opentelemetry.io/otel/sdk/trace"
+
+// version is the current release version of the metric SDK in use.
+func version() string {
+	return "1.16.0-rc.1"
+}