go test -race detects significant amount of data races #8586

jcajka · 2023-02-22T13:33:25Z

Describe the bug
There appears to be race conditions detected by the Go's race detector. Is that expected?

To Reproduce
Steps to reproduce the behavior:

in root directory of the loki source code run 'go test -race ./...'

Expected behavior
There are no races detected by the Go's race detector.

Environment:

Infrastructure: container, amd64/linux with go1.20

Screenshots, Promtail config, or terminal output
In attachment is output of the tests run with the race detector enabled and cleaned up to only failed test cases. It seems rather long, but there might be some duplicit race conditions. I haven't investigated deeper as IMHO it would be better suited for someone with deeper knowledge of the loki's codebase.

For bit of context I have seen some tests failures on other than amd64/linux, that from guts feeling could have been race conditions. So I have run the race detector on amd64/linux to rule out any preexisting ones.
loki-race.log

jeschkies · 2023-02-23T11:14:44Z

Thanks for pointing this out. You are correct but the tests run quite long to be executed by the CI. So we'd have to find a better way.

**What this PR does / why we need it**: We must call wg.Add before starting the goroutine. And protect the data in mockCompactorClient. And another fix in shipper/index/compactor. **Which issue(s) this PR fixes**: Part of #8586 **Checklist** - [x] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - NA Documentation added - NA Tests updated - NA `CHANGELOG.md` updated - NA If the change is worth mentioning in the release notes, add `add-to-release-notes` label - NA Changes that require user attention or interaction to upgrade are documented in `docs/sources/setup/upgrade/_index.md` - NA For Helm chart changes bump the Helm chart version in `production/helm/loki/Chart.yaml` and update `production/helm/loki/CHANGELOG.md` and `production/helm/loki/README.md`. [Example PR](d10549e)

@akhilanarayanan

Backport cf353bb from #10310 --- **What this PR does / why we need it**: ~Lock around data that is modified from multiple goroutines concurrently.~ Replaced with the implementation from #9984 since @akhilanarayanan did it more efficiently. **Which issue(s) this PR fixes**: Relates to #8586 **Checklist** - [x] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - NA Documentation added - NA Tests updated - [x] `CHANGELOG.md` updated - NA If the change is worth mentioning in the release notes, add `add-to-release-notes` label - NA Changes that require user attention or interaction to upgrade are documented in `docs/sources/setup/upgrade/_index.md` - NA For Helm chart changes bump the Helm chart version in `production/helm/loki/Chart.yaml` and update `production/helm/loki/CHANGELOG.md` and `production/helm/loki/README.md`. [Example PR](d10549e) Co-authored-by: Bryan Boreham <[email protected]>

**What this PR does / why we need it**: There were many race conditions reported if you run `go test -race` on this package. Google's 'singleflight' package is much neater and makes all the race warnings go away. **Which issue(s) this PR fixes**: Relates to #8586 **Checklist** - [x] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - NA Documentation added - NA Tests updated - [x] `CHANGELOG.md` updated - NA If the change is worth mentioning in the release notes, add `add-to-release-notes` label - NA Changes that require user attention or interaction to upgrade are documented in `docs/sources/setup/upgrade/_index.md` - NA For Helm chart changes bump the Helm chart version in `production/helm/loki/Chart.yaml` and update `production/helm/loki/CHANGELOG.md` and `production/helm/loki/README.md`. [Example PR](d10549e)

There were many race conditions reported if you run `go test -race` on this package. Google's 'singleflight' package is much neater and makes all the race warnings go away. **Which issue(s) this PR fixes**: Relates to #8586

There were many race conditions reported if you run `go test -race` on this package. Google's 'singleflight' package is much neater and makes all the race warnings go away. **Which issue(s) this PR fixes**: Relates to #8586 **Special notes for your reviewer**: This is a backport of #10314 to the 2.9.x release branch. --------- Signed-off-by: Christian Haudum <[email protected]> Co-authored-by: Bryan Boreham <[email protected]>

**What this PR does / why we need it**: A data race existed with the workerID variable, as it could be modified by multiple goroutines. Relates to: #8586 -- Before fix: ``` go test -count=1 -race ./pkg/querier/worker ================== WARNING: DATA RACE Read at 0x00c000494108 by goroutine 229: github.com/grafana/loki/pkg/querier/worker.(*processorManager).concurrency.func1() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/processor_manager.go:81 +0x118 Previous write at 0x00c000494108 by goroutine 222: github.com/grafana/loki/pkg/querier/worker.(*processorManager).concurrency() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/processor_manager.go:70 +0x108 github.com/grafana/loki/pkg/querier/worker.(*querierWorker).resetConcurrency() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker.go:267 +0x10c github.com/grafana/loki/pkg/querier/worker.(*querierWorker).AddressAdded() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker.go:219 +0x868 github.com/grafana/loki/pkg/querier/worker.TestResetConcurrency.func1() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker_test.go:64 +0x1c8 testing.tRunner() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1595 +0x1b0 testing.(*T).Run.func1() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x40 Goroutine 229 (running) created at: github.com/grafana/loki/pkg/querier/worker.(*processorManager).concurrency() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/processor_manager.go:75 +0xcc github.com/grafana/loki/pkg/querier/worker.(*querierWorker).resetConcurrency() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker.go:267 +0x10c github.com/grafana/loki/pkg/querier/worker.(*querierWorker).AddressAdded() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker.go:219 +0x868 github.com/grafana/loki/pkg/querier/worker.TestResetConcurrency.func1() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker_test.go:64 +0x1c8 testing.tRunner() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1595 +0x1b0 testing.(*T).Run.func1() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x40 Goroutine 222 (running) created at: testing.(*T).Run() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x5e8 github.com/grafana/loki/pkg/querier/worker.TestResetConcurrency() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker_test.go:52 +0x1b0 testing.tRunner() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1595 +0x1b0 testing.(*T).Run.func1() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x40 ================== --- FAIL: TestResetConcurrency (0.02s) --- FAIL: TestResetConcurrency/concurrency_is_correct_when_numTargets_does_not_divide_evenly_into_maxConcurrent (0.01s) testing.go:1465: race detected during execution of test testing.go:1465: race detected during execution of test FAIL FAIL github.com/grafana/loki/pkg/querier/worker 4.626s FAIL ``` -- After fix: ``` go clean -testcache go test -count=1 -race ./pkg/querier/worker ok github.com/grafana/loki/pkg/querier/worker 6.034s ``` **Which issue(s) this PR fixes**: Fixes #<issue number> **Special notes for your reviewer**: **Checklist** - [ ] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - [ ] Documentation added - [ ] Tests updated - [ ] `CHANGELOG.md` updated - [ ] If the change is worth mentioning in the release notes, add `add-to-release-notes` label - [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/setup/upgrade/_index.md` - [ ] For Helm chart changes bump the Helm chart version in `production/helm/loki/Chart.yaml` and update `production/helm/loki/CHANGELOG.md` and `production/helm/loki/README.md`. [Example PR](d10549e) - [ ] If the change is deprecating or removing a configuration option, update the `deprecated-config.yaml` and `deleted-config.yaml` files respectively in the `tools/deprecated-config-checker` directory. [Example PR](0d4416a)

**What this PR does / why we need it**: This addresses the data race present on the `t.stopped` variable in `tail.go`. ``` ================== WARNING: DATA RACE Write at 0x00c00098b198 by goroutine 568: github.com/grafana/loki/pkg/querier.(*Tailer).close() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail.go:272 +0x104 github.com/grafana/loki/pkg/querier.TestTailer.func7.2() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail_test.go:169 +0x34 runtime.deferreturn() /opt/homebrew/Cellar/go/1.21.6/libexec/src/runtime/panic.go:477 +0x34 testing.tRunner() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1595 +0x1b0 testing.(*T).Run.func1() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x40 Previous read at 0x00c00098b198 by goroutine 569: github.com/grafana/loki/pkg/querier.(*Tailer).loop() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail.go:88 +0x13c github.com/grafana/loki/pkg/querier.newTailer.func1() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail.go:342 +0x34 Goroutine 568 (running) created at: testing.(*T).Run() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x5e8 github.com/grafana/loki/pkg/querier.TestTailer() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail_test.go:158 +0x10dc testing.tRunner() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1595 +0x1b0 testing.(*T).Run.func1() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x40 Goroutine 569 (running) created at: github.com/grafana/loki/pkg/querier.newTailer() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail.go:342 +0x300 github.com/grafana/loki/pkg/querier.TestTailer.func7() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail_test.go:168 +0x138 testing.tRunner() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1595 +0x1b0 testing.(*T).Run.func1() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x40 ================== ``` **Which issue(s) this PR fixes**: Relates to: #8586 **Special notes for your reviewer**: **Checklist** - [ ] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - [ ] Documentation added - [ ] Tests updated - [ ] `CHANGELOG.md` updated - [ ] If the change is worth mentioning in the release notes, add `add-to-release-notes` label - [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/setup/upgrade/_index.md` - [ ] For Helm chart changes bump the Helm chart version in `production/helm/loki/Chart.yaml` and update `production/helm/loki/CHANGELOG.md` and `production/helm/loki/README.md`. [Example PR](d10549e) - [ ] If the change is deprecating or removing a configuration option, update the `deprecated-config.yaml` and `deleted-config.yaml` files respectively in the `tools/deprecated-config-checker` directory. [Example PR](0d4416a)

**What this PR does / why we need it**: A data race existed with the workerID variable, as it could be modified by multiple goroutines. Relates to: grafana#8586 -- Before fix: ``` go test -count=1 -race ./pkg/querier/worker ================== WARNING: DATA RACE Read at 0x00c000494108 by goroutine 229: github.com/grafana/loki/pkg/querier/worker.(*processorManager).concurrency.func1() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/processor_manager.go:81 +0x118 Previous write at 0x00c000494108 by goroutine 222: github.com/grafana/loki/pkg/querier/worker.(*processorManager).concurrency() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/processor_manager.go:70 +0x108 github.com/grafana/loki/pkg/querier/worker.(*querierWorker).resetConcurrency() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker.go:267 +0x10c github.com/grafana/loki/pkg/querier/worker.(*querierWorker).AddressAdded() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker.go:219 +0x868 github.com/grafana/loki/pkg/querier/worker.TestResetConcurrency.func1() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker_test.go:64 +0x1c8 testing.tRunner() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1595 +0x1b0 testing.(*T).Run.func1() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x40 Goroutine 229 (running) created at: github.com/grafana/loki/pkg/querier/worker.(*processorManager).concurrency() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/processor_manager.go:75 +0xcc github.com/grafana/loki/pkg/querier/worker.(*querierWorker).resetConcurrency() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker.go:267 +0x10c github.com/grafana/loki/pkg/querier/worker.(*querierWorker).AddressAdded() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker.go:219 +0x868 github.com/grafana/loki/pkg/querier/worker.TestResetConcurrency.func1() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker_test.go:64 +0x1c8 testing.tRunner() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1595 +0x1b0 testing.(*T).Run.func1() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x40 Goroutine 222 (running) created at: testing.(*T).Run() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x5e8 github.com/grafana/loki/pkg/querier/worker.TestResetConcurrency() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/worker/worker_test.go:52 +0x1b0 testing.tRunner() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1595 +0x1b0 testing.(*T).Run.func1() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x40 ================== --- FAIL: TestResetConcurrency (0.02s) --- FAIL: TestResetConcurrency/concurrency_is_correct_when_numTargets_does_not_divide_evenly_into_maxConcurrent (0.01s) testing.go:1465: race detected during execution of test testing.go:1465: race detected during execution of test FAIL FAIL github.com/grafana/loki/pkg/querier/worker 4.626s FAIL ``` -- After fix: ``` go clean -testcache go test -count=1 -race ./pkg/querier/worker ok github.com/grafana/loki/pkg/querier/worker 6.034s ``` **Which issue(s) this PR fixes**: Fixes #<issue number> **Special notes for your reviewer**: **Checklist** - [ ] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - [ ] Documentation added - [ ] Tests updated - [ ] `CHANGELOG.md` updated - [ ] If the change is worth mentioning in the release notes, add `add-to-release-notes` label - [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/setup/upgrade/_index.md` - [ ] For Helm chart changes bump the Helm chart version in `production/helm/loki/Chart.yaml` and update `production/helm/loki/CHANGELOG.md` and `production/helm/loki/README.md`. [Example PR](grafana@d10549e) - [ ] If the change is deprecating or removing a configuration option, update the `deprecated-config.yaml` and `deleted-config.yaml` files respectively in the `tools/deprecated-config-checker` directory. [Example PR](grafana@0d4416a)

**What this PR does / why we need it**: This addresses the data race present on the `t.stopped` variable in `tail.go`. ``` ================== WARNING: DATA RACE Write at 0x00c00098b198 by goroutine 568: github.com/grafana/loki/pkg/querier.(*Tailer).close() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail.go:272 +0x104 github.com/grafana/loki/pkg/querier.TestTailer.func7.2() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail_test.go:169 +0x34 runtime.deferreturn() /opt/homebrew/Cellar/go/1.21.6/libexec/src/runtime/panic.go:477 +0x34 testing.tRunner() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1595 +0x1b0 testing.(*T).Run.func1() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x40 Previous read at 0x00c00098b198 by goroutine 569: github.com/grafana/loki/pkg/querier.(*Tailer).loop() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail.go:88 +0x13c github.com/grafana/loki/pkg/querier.newTailer.func1() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail.go:342 +0x34 Goroutine 568 (running) created at: testing.(*T).Run() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x5e8 github.com/grafana/loki/pkg/querier.TestTailer() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail_test.go:158 +0x10dc testing.tRunner() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1595 +0x1b0 testing.(*T).Run.func1() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x40 Goroutine 569 (running) created at: github.com/grafana/loki/pkg/querier.newTailer() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail.go:342 +0x300 github.com/grafana/loki/pkg/querier.TestTailer.func7() /Users/progers/dev/src/github.com/grafana/loki/pkg/querier/tail_test.go:168 +0x138 testing.tRunner() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1595 +0x1b0 testing.(*T).Run.func1() /opt/homebrew/Cellar/go/1.21.6/libexec/src/testing/testing.go:1648 +0x40 ================== ``` **Which issue(s) this PR fixes**: Relates to: grafana#8586 **Special notes for your reviewer**: **Checklist** - [ ] Reviewed the [`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md) guide (**required**) - [ ] Documentation added - [ ] Tests updated - [ ] `CHANGELOG.md` updated - [ ] If the change is worth mentioning in the release notes, add `add-to-release-notes` label - [ ] Changes that require user attention or interaction to upgrade are documented in `docs/sources/setup/upgrade/_index.md` - [ ] For Helm chart changes bump the Helm chart version in `production/helm/loki/Chart.yaml` and update `production/helm/loki/CHANGELOG.md` and `production/helm/loki/README.md`. [Example PR](grafana@d10549e) - [ ] If the change is deprecating or removing a configuration option, update the `deprecated-config.yaml` and `deleted-config.yaml` files respectively in the `tools/deprecated-config-checker` directory. [Example PR](grafana@0d4416a)

Fixes #8586 Signed-off-by: Bryan Boreham <[email protected]>

jcajka changed the title ~~go test -race detecs significant amount of data races~~ go test -race detects significant amount of data races Feb 22, 2023

This was referenced Aug 22, 2023

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fix: errors reported by the race detector (#13174)

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Fixes #8586 Signed-off-by: Bryan Boreham <[email protected]>

This was referenced Jun 17, 2024

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go test -race detects significant amount of data races #8586

go test -race detects significant amount of data races #8586

jcajka commented Feb 22, 2023

jeschkies commented Feb 23, 2023

go test -race detects significant amount of data races #8586

go test -race detects significant amount of data races #8586

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jcajka commented Feb 22, 2023

jeschkies commented Feb 23, 2023