Please answer these questions before submitting your issue. Thanks!
What version of Go are you using (go version)?
go version go1.8 darwin/amd64
What operating system and processor architecture are you using (go env)?
GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/tamird/src/go"
GORACE=""
GOROOT="/Users/tamird/src/go1.8"
GOTOOLDIR="/Users/tamird/src/go1.8/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/lf/1_qqs3815tzgkhtrbrjs913m0000gn/T/go-build904117806=/tmp/go-build -gno-record-gcc-switches -fno-common"
CXX="clang++"
CGO_ENABLED="1"
PKG_CONFIG="pkg-config"
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
What did you do?
main_test.go:
package main
import "testing"
func TestRace(t *testing.T) {
t.Run("", func(t *testing.T) {
defer func() {
if !t.Failed() {
t.Errorf("subtest did not fail")
}
}()
for i := 0; i < 10; i++ {
c := make(chan int)
x := 1
go func() {
x = 2
c <- 1
}()
x = 3
<-c
}
})
if !t.Failed() {
t.Errorf("test did not fail")
}
}What did you expect to see?
==================
WARNING: DATA RACE
Write at 0x00c420070df8 by goroutine 8:
github.com/cockroachdb/cockroach/foo.TestRace.func1.2()
/Users/tamird/src/go/src/github.com/cockroachdb/cockroach/foo/main_test.go:16 +0x3b
Previous write at 0x00c420070df8 by goroutine 7:
github.com/cockroachdb/cockroach/foo.TestRace.func1()
/Users/tamird/src/go/src/github.com/cockroachdb/cockroach/foo/main_test.go:19 +0xf6
testing.tRunner()
/Users/tamird/src/go1.8/src/testing/testing.go:657 +0x107
Goroutine 8 (running) created at:
github.com/cockroachdb/cockroach/foo.TestRace.func1()
/Users/tamird/src/go/src/github.com/cockroachdb/cockroach/foo/main_test.go:18 +0xe5
testing.tRunner()
/Users/tamird/src/go1.8/src/testing/testing.go:657 +0x107
Goroutine 7 (running) created at:
testing.(*T).Run()
/Users/tamird/src/go1.8/src/testing/testing.go:697 +0x543
github.com/cockroachdb/cockroach/foo.TestRace()
/Users/tamird/src/go/src/github.com/cockroachdb/cockroach/foo/main_test.go:22 +0x5a
testing.tRunner()
/Users/tamird/src/go1.8/src/testing/testing.go:657 +0x107
==================
--- FAIL: TestRace (0.00s)
--- FAIL: TestRace/#00 (0.00s)
testing.go:610: race detected during execution of test
testing.go:610: race detected during execution of test
FAIL
FAIL github.com/cockroachdb/cockroach/foo 0.021s
What did you see instead?
==================
WARNING: DATA RACE
Write at 0x00c42006edf8 by goroutine 8:
github.com/cockroachdb/cockroach/foo.TestRace.func1.2()
/Users/tamird/src/go/src/github.com/cockroachdb/cockroach/foo/main_test.go:16 +0x3b
Previous write at 0x00c42006edf8 by goroutine 7:
github.com/cockroachdb/cockroach/foo.TestRace.func1()
/Users/tamird/src/go/src/github.com/cockroachdb/cockroach/foo/main_test.go:19 +0xf6
testing.tRunner()
/Users/tamird/src/go1.8/src/testing/testing.go:657 +0x107
Goroutine 8 (running) created at:
github.com/cockroachdb/cockroach/foo.TestRace.func1()
/Users/tamird/src/go/src/github.com/cockroachdb/cockroach/foo/main_test.go:18 +0xe5
testing.tRunner()
/Users/tamird/src/go1.8/src/testing/testing.go:657 +0x107
Goroutine 7 (running) created at:
testing.(*T).Run()
/Users/tamird/src/go1.8/src/testing/testing.go:697 +0x543
github.com/cockroachdb/cockroach/foo.TestRace()
/Users/tamird/src/go/src/github.com/cockroachdb/cockroach/foo/main_test.go:22 +0x5a
testing.tRunner()
/Users/tamird/src/go1.8/src/testing/testing.go:657 +0x107
==================
--- FAIL: TestRace (0.00s)
--- FAIL: TestRace/#00 (0.00s)
main_test.go:9: subtest did not fail
testing.go:610: race detected during execution of test
testing.go:610: race detected during execution of test
FAIL
FAIL github.com/cockroachdb/cockroach/foo 0.015s
Note the presence of main_test.go:9: subtest did not fail. We're running into this issue in CockroachDB, where we have logging redirection taking place for the duration of the test; if the test is not observed to have failed at the end of the run, the logs are cleaned up. As the snippet above demonstrates, it's not currently possible for a test to observe its own race-related failure, so we end up losing our logs. The CockroachDB issue is cockroachdb/cockroach#14563.
Related to #15972.
cc @dvyukov @rsc
Please answer these questions before submitting your issue. Thanks!
What version of Go are you using (
go version)?go version go1.8 darwin/amd64What operating system and processor architecture are you using (
go env)?What did you do?
main_test.go:What did you expect to see?
What did you see instead?
Note the presence of
main_test.go:9: subtest did not fail. We're running into this issue in CockroachDB, where we have logging redirection taking place for the duration of the test; if the test is not observed to have failed at the end of the run, the logs are cleaned up. As the snippet above demonstrates, it's not currently possible for a test to observe its own race-related failure, so we end up losing our logs. The CockroachDB issue is cockroachdb/cockroach#14563.Related to #15972.
cc @dvyukov @rsc