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limpo1989 opened this issue Sep 26, 2023 · 2 comments
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log/slog: data race in log/slog.Logger.With #63225

limpo1989 opened this issue Sep 26, 2023 · 2 comments
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FrozenDueToAge NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one.

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@limpo1989
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What version of Go are you using (go version)?

$ go version
go version go1.21.1 linux/amd64

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

go env Output
$ go env
GO111MODULE=''
GOARCH='amd64'
GOBIN=''
GOCACHE='/home/limpo1989/.cache/go-build'
GOENV='/home/limpo1989/.config/go/env'
GOEXE=''
GOEXPERIMENT=''
GOFLAGS=''
GOHOSTARCH='amd64'
GOHOSTOS='linux'
GOINSECURE=''
GOMODCACHE='/home/limpo1989/go/pkg/mod'
GOOS='linux'
GOPATH='/home/limpo1989/go'
GOROOT='/usr/local/go'
GOSUMDB='sum.golang.org'
GOTMPDIR=''
GOTOOLCHAIN='auto'
GOTOOLDIR='/usr/local/go/pkg/tool/linux_amd64'
GOVCS=''
GOVERSION='go1.21.1'
GCCGO='gccgo'
GOAMD64='v1'
AR='ar'
CC='gcc'
CXX='g++'
CGO_ENABLED='1'
GOMOD='/dev/null'
GOWORK=''
CGO_CFLAGS='-O2 -g'
CGO_CPPFLAGS=''
CGO_CXXFLAGS='-O2 -g'
CGO_FFLAGS='-O2 -g'
CGO_LDFLAGS='-O2 -g'
PKG_CONFIG='pkg-config'
GOGCCFLAGS='-fPIC -m64 -pthread -Wl,--no-gc-sections -fmessage-length=0 -ffile-prefix-map=/tmp/go-build3114110366=/tmp/go-build -gno-record-gcc-switches'

What did you do?

In the slog logging library, I use With to create a new log copy, which makes it easier to add independent loggers in different modules.
https://pkg.go.dev/log/slog#Logger.With

The test program reports a DATA RACE. What should I do?

What did you expect to see?

The test passed.

What did you see instead?

Run unit test command, and added the -race argument. The test failed.

==================
WARNING: DATA RACE
Read at 0x00c0001dc130 by goroutine 24:
  log/slog.(*commonHandler).enabled()
      /usr/local/go/src/log/slog/handler.go:218 +0x51
  log/slog.(*TextHandler).Enabled()
      /usr/local/go/src/log/slog/text_handler.go:45 +0x26
  log/slog.(*Logger).Enabled()
      /usr/local/go/src/log/slog/logger.go:137 +0x75
  log/slog.(*Logger).log()
      /usr/local/go/src/log/slog/logger.go:210 +0x96
  log/slog.(*Logger).Info()
      /usr/local/go/src/log/slog/logger.go:178 +0x11e
  github.com/go-spring-projects/go-spring/gs.(*App).Shutdown()
      /mnt/e/projects/go-spring-projects/go-spring/gs/app.go:189 +0x72
  github.com/go-spring-projects/go-spring/gs.TestConfig.func3.2()
      /mnt/e/projects/go-spring-projects/go-spring/gs/app_test.go:80 +0x5b
  runtime.deferreturn()
      /usr/local/go/src/runtime/panic.go:477 +0x30
  testing.tRunner()
      /usr/local/go/src/testing/testing.go:1595 +0x238
  testing.(*T).Run.func1()
      /usr/local/go/src/testing/testing.go:1648 +0x44

Previous write at 0x00c0001dc130 by goroutine 25:
  log/slog.(*commonHandler).clone()
      /usr/local/go/src/log/slog/handler.go:204 +0x4cf
  log/slog.(*commonHandler).withAttrs()
      /usr/local/go/src/log/slog/handler.go:230 +0x3d4
  log/slog.(*TextHandler).WithAttrs()
      /usr/local/go/src/log/slog/text_handler.go:51 +0x57
  log/slog.(*Logger).With()
      /usr/local/go/src/log/slog/logger.go:99 +0x112
  github.com/go-spring-projects/go-spring/internal/log.GetLogger()
      /mnt/e/projects/go-spring-projects/go-spring/internal/log/logger.go:74 +0x187
  github.com/go-spring-projects/go-spring/gs.GetLogger()
      /mnt/e/projects/go-spring-projects/go-spring/gs/logger.go:28 +0x4dc
  github.com/go-spring-projects/go-spring/gs.(*App).run()
      /mnt/e/projects/go-spring-projects/go-spring/gs/app.go:91 +0x4ba
  github.com/go-spring-projects/go-spring/gs.(*App).Run()
      /mnt/e/projects/go-spring-projects/go-spring/gs/app.go:68 +0xa9
  github.com/go-spring-projects/go-spring/gs.startApplication.func2()
      /mnt/e/projects/go-spring-projects/go-spring/gs/app_test.go:40 +0x35

Full Report:
https://github.com/go-spring-projects/go-spring/actions/runs/6307172009/job/17123387313#step:4:80
@ianlancetaylor
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CC @jba

@thanm thanm added the NeedsInvestigation Someone must examine and confirm this is a valid issue and not a duplicate of an existing one. label Sep 26, 2023
@seankhliao
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seankhliao commented Sep 27, 2023 •
edited
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This is a race in your test setup, you call app.Run in goroutine which sets your loggger, unsynchronized with app.Shutdown which calls it.

simplified as https://go.dev/play/p/piG5pNjWGsw

@seankhliao seankhliao closed this as not planned Won't fix, can't repro, duplicate, stale Sep 27, 2023
@golang golang locked and limited conversation to collaborators Sep 26, 2024
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@ianlancetaylor @limpo1989 @gopherbot @seankhliao @thanm