reproduce otel-go issue

go.mod

module otelsample

go 1.17

require (
	github.com/gorilla/mux v1.8.0
	go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux v0.24.0
	go.opentelemetry.io/otel v1.0.1
	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.0.1
	go.opentelemetry.io/otel/sdk v1.0.1
	go.opentelemetry.io/otel/trace v1.0.1
)

require (
	github.com/felixge/httpsnoop v1.0.2 // indirect
	go.opentelemetry.io/otel/exporters/jaeger v1.0.1 // indirect
	golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7 // indirect
)

go.sum

github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/felixge/httpsnoop v1.0.2 h1:+nS9g82KMXccJ/wp0zyRW9ZBHFETmMGtkk+2CTTrW4o=
github.com/felixge/httpsnoop v1.0.2/go.mod h1:m8KPJKqk1gH5J9DgRY2ASl2lWCfGKXixSwevea8zH2U=
github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux v0.24.0 h1:RLxYy9mCdYJrOdtcqI3Ha972vuuCtNl1kPcUe/HJfyc=
go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux v0.24.0/go.mod h1:i17dTnrrhnn6pladwju5XEFOR3VVSg/R5X9KJuJlXFw=
go.opentelemetry.io/otel v1.0.0/go.mod h1:AjRVh9A5/5DE7S+mZtTR6t8vpKKryam+0lREnfmS4cg=
go.opentelemetry.io/otel v1.0.1 h1:4XKyXmfqJLOQ7feyV5DB6gsBFZ0ltB8vLtp6pj4JIcc=
go.opentelemetry.io/otel v1.0.1/go.mod h1:OPEOD4jIT2SlZPMmwT6FqZz2C0ZNdQqiWcoK6M0SNFU=
go.opentelemetry.io/otel/exporters/jaeger v1.0.1 h1:fg9udWIWWJMAT+Gq2ATFd/DFy3OZvKEZy9VK2amxvkw=
go.opentelemetry.io/otel/exporters/jaeger v1.0.1/go.mod h1:85Ym3qknJdIdfRzYS9Ofy9NeLi9gKPFzFDBEHCKpfXI=
go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.0.1 h1:QaXn87hD37gomnr0W9OVju7ouaijrT7+92uurmn2zvQ=
go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.0.1/go.mod h1:B1r9v/IqMtkB0lIGbbayqT6f2awSH0EDZya1Yu4p1pU=
go.opentelemetry.io/otel/sdk v1.0.1 h1:wXxFEWGo7XfXupPwVJvTBOaPBC9FEg0wB8hMNrKk+cA=
go.opentelemetry.io/otel/sdk v1.0.1/go.mod h1:HrdXne+BiwsOHYYkBE5ysIcv2bvdZstxzmCQhxTcZkI=
go.opentelemetry.io/otel/trace v1.0.0/go.mod h1:PXTWqayeFUlJV1YDNhsJYB184+IvAH814St6o6ajzIs=
go.opentelemetry.io/otel/trace v1.0.1 h1:StTeIH6Q3G4r0Fiw34LTokUFESZgIDUr0qIJ7mKmAfw=
go.opentelemetry.io/otel/trace v1.0.1/go.mod h1:5g4i4fKLaX2BQpSBsxw8YYcgKpMMSW3x7ZTuYBr3sUk=
golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7 h1:iGu644GcxtEcrInvDsQRCwJjtCIOlT2V7IRt6ah2Whw=
golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

// 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 main

import (
	"context"
	"fmt"
	"log"
	"net/http"
	"time"

	"github.com/gorilla/mux"

	"go.opentelemetry.io/contrib/instrumentation/github.com/gorilla/mux/otelmux"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/trace"
)

func main() {
	tp1, err := initJaegerProvider("http://localhost:14268/api/traces")
	if err != nil {
		log.Fatal(err)
	}
	defer func() {
		if err := tp1.Shutdown(context.Background()); err != nil {
			log.Printf("Error shutting down jaeger tracer provider: %v", err)
		}
	}()
	if true { // if false, it works fine
		tp2 := initStdoutProvider()
		defer func() {
			if err := tp2.Shutdown(context.Background()); err != nil {
				log.Printf("Error shutting down stdout tracer provider: %v", err)
			}
		}()
	}
	r := mux.NewRouter()
	r.Use(otelmux.Middleware("my-server"))
	// trace-provider-init
	r.HandleFunc("/users/{id:[0-9]+}", http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		vars := mux.Vars(r)
		id := vars["id"]
		name := getUser(r.Context(), id)
		time.Sleep(time.Microsecond)
		reply := fmt.Sprintf("user %s (id %s)\n", name, id)
		_, _ = w.Write(([]byte)(reply))
	}))
	http.Handle("/", r)
	log.Println("start listening at :8080")
	_ = http.ListenAndServe(":8080", nil)
}

func getUser(ctx context.Context, id string) string {
	time.Sleep(time.Microsecond)
	log.Println("getUser", id)
	_, span := tracer.Start(ctx, "getUser", trace.WithAttributes(attribute.String("id", id)))
	defer span.End()
	time.Sleep(time.Microsecond)
	if id == "123" {
		return "otelmux tester"
	}
	return "unknown"
}

trace.go

package main

import (
	"log"

	"go.opentelemetry.io/otel"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/exporters/jaeger"
	stdout "go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
	"go.opentelemetry.io/otel/propagation"
	"go.opentelemetry.io/otel/sdk/resource"
	sdktrace "go.opentelemetry.io/otel/sdk/trace"
	semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
)

var tracer = otel.Tracer("mux-server")

func initJaegerProvider(url string) (*sdktrace.TracerProvider, error) {
	// Create the Jaeger exporter
	exp, err := jaeger.New(jaeger.WithCollectorEndpoint(jaeger.WithEndpoint(url)))
	if err != nil {
		return nil, err
	}
	tp := sdktrace.NewTracerProvider(
		// Always be sure to batch in production.
		sdktrace.WithBatcher(exp),
		// Record information about this application in an Resource.
		sdktrace.WithResource(resource.NewWithAttributes(
			semconv.SchemaURL,
			semconv.ServiceNameKey.String("otel demo"),
			attribute.String("environment", "local test"),
		)),
	)
	otel.SetTracerProvider(tp)
	return tp, nil
}

func initStdoutProvider()  *sdktrace.TracerProvider{
		exporter, err := stdout.New(stdout.WithPrettyPrint())
		if err != nil {
			log.Fatal(err)
		}
		tp := sdktrace.NewTracerProvider(
			sdktrace.WithSampler(sdktrace.AlwaysSample()),
			sdktrace.WithBatcher(exporter),
		)
		otel.SetTracerProvider(tp)
		otel.SetTextMapPropagator(propagation.NewCompositeTextMapPropagator(propagation.TraceContext{}, propagation.Baggage{}))
		return tp
	}