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Synchronize read & write of TaskGroupWithContext's err variable - #37
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alitto
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Thanks a lot for this contribution @thekondor! 🙌. I'll merge this and release a patch version to include it.
Very nice PR description 🙂
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## [1.3.2](v1.3.1...v1.3.2) (2022-11-01) ### ⬆️ Dependencies * **deps:** Bump actions/cache from 3.0.10 to 3.0.11 ([#365](#365)) ([4e88994](4e88994)), closes [actions/cache#946](actions/cache#946) [actions/cache#950](actions/cache#950) [actions/cache#956](actions/cache#956) [actions/cache#950](actions/cache#950) [#956](#956) [#950](#950) [#946](#946) * **deps:** bump actions/cache from 3.0.8 to 3.0.10 ([#358](#358)) ([921d9e2](921d9e2)), closes [#809](#809) [#833](#833) [#810](#810) [#931](#931) [#942](#942) [#930](#930) [#920](#920) [#936](#936) [#925](#925) * **deps:** Bump actions/setup-python from 4.2.0 to 4.3.0 ([#362](#362)) ([05a7ab3](05a7ab3)), closes [#517](#517) [#499](#499) [#443](#443) [#477](#477) [#479](#479) [#491](#491) [#492](#492) [#517](#517) [#503](#503) [#499](#499) [#495](#495) [#443](#443) [#492](#492) [#491](#491) * **deps:** Bump docker/login-action from 2.0.0 to 2.1.0 ([#364](#364)) ([ca6a535](ca6a535)), closes [#275](#275) [#252](#252) [#292](#292) [#298](#298) [#299](#299) [#299](#299) [#298](#298) [#292](#292) [#275](#275) * **deps:** Bump github.com/alitto/pond from 1.8.1 to 1.8.2 ([#371](#371)) ([417edd5](417edd5)), closes [alitto/pond#37](alitto/pond#37) [#37](#37) * **deps:** bump github.com/aws/aws-sdk-go from 1.44.100 to 1.44.109 ([#359](#359)) ([b9acd7d](b9acd7d)), closes [#4574](https://github.com/estahn/k8s-image-swapper/issues/4574) [#4573](https://github.com/estahn/k8s-image-swapper/issues/4573) [#4571](https://github.com/estahn/k8s-image-swapper/issues/4571) [#4568](https://github.com/estahn/k8s-image-swapper/issues/4568) [#4567](https://github.com/estahn/k8s-image-swapper/issues/4567) [#4566](https://github.com/estahn/k8s-image-swapper/issues/4566) [#4565](https://github.com/estahn/k8s-image-swapper/issues/4565) [#4562](https://github.com/estahn/k8s-image-swapper/issues/4562) [#4561](https://github.com/estahn/k8s-image-swapper/issues/4561) * **deps:** Bump github.com/aws/aws-sdk-go from 1.44.109 to 1.44.114 ([#363](#363)) ([832a21d](832a21d)), closes [#4580](https://github.com/estahn/k8s-image-swapper/issues/4580) [#4579](https://github.com/estahn/k8s-image-swapper/issues/4579) [#4578](https://github.com/estahn/k8s-image-swapper/issues/4578) [#4576](https://github.com/estahn/k8s-image-swapper/issues/4576) [#4575](https://github.com/estahn/k8s-image-swapper/issues/4575) * **deps:** Bump github.com/aws/aws-sdk-go from 1.44.114 to 1.44.121 ([#377](#377)) ([26f4103](26f4103)), closes [#4596](https://github.com/estahn/k8s-image-swapper/issues/4596) [#4595](https://github.com/estahn/k8s-image-swapper/issues/4595) [#4593](https://github.com/estahn/k8s-image-swapper/issues/4593) [#4519](https://github.com/estahn/k8s-image-swapper/issues/4519) [#4590](https://github.com/estahn/k8s-image-swapper/issues/4590) [#4589](https://github.com/estahn/k8s-image-swapper/issues/4589) [#4587](https://github.com/estahn/k8s-image-swapper/issues/4587) [#4586](https://github.com/estahn/k8s-image-swapper/issues/4586) * **deps:** Bump github.com/aws/aws-sdk-go from 1.44.121 to 1.44.126 ([#383](#383)) ([b7e43d9](b7e43d9)), closes [#4603](https://github.com/estahn/k8s-image-swapper/issues/4603) [#4602](https://github.com/estahn/k8s-image-swapper/issues/4602) [#4601](https://github.com/estahn/k8s-image-swapper/issues/4601) [#4600](https://github.com/estahn/k8s-image-swapper/issues/4600) [#4598](https://github.com/estahn/k8s-image-swapper/issues/4598) * **deps:** bump github.com/containers/image/v5 from 5.22.0 to 5.23.0 ([#360](#360)) ([250d9e4](250d9e4)), closes [#1665](https://github.com/estahn/k8s-image-swapper/issues/1665) [#1666](https://github.com/estahn/k8s-image-swapper/issues/1666) [#1664](https://github.com/estahn/k8s-image-swapper/issues/1664) [#1662](https://github.com/estahn/k8s-image-swapper/issues/1662) * **deps:** Bump github.com/dgraph-io/ristretto from 0.1.0 to 0.1.1 ([#368](#368)) ([0e9c9df](0e9c9df)), closes [#285](#285) [dgraph-io/ristretto#311](dgraph-io/ristretto#311) [#304](#304) [dgraph-io/ristretto#304](dgraph-io/ristretto#304) [#287](#287) [dgraph-io/ristretto#307](dgraph-io/ristretto#307) [#285](#285) [dgraph-io/ristretto#311](dgraph-io/ristretto#311) [#304](#304) [dgraph-io/ristretto#304](dgraph-io/ristretto#304) [#287](#287) [dgraph-io/ristretto#307](dgraph-io/ristretto#307) [#312](#312) [#285](#285) [#310](#310) [#306](#306) [#309](#309) [#308](#308) [#287](#287) [#307](#307) [#304](#304) * **deps:** Bump github.com/go-co-op/gocron from 1.17.0 to 1.17.1 ([#380](#380)) ([8c4cef8](8c4cef8)), closes [go-co-op/gocron#382](go-co-op/gocron#382) [go-co-op/gocron#386](go-co-op/gocron#386) [go-co-op/gocron#386](go-co-op/gocron#386) [#386](#386) [#382](#382) * **deps:** Bump github.com/gruntwork-io/terratest from 0.40.22 to 0.40.23 ([#367](#367)) ([a07149b](a07149b)), closes [gruntwork-io/terratest#1186](gruntwork-io/terratest#1186) [gruntwork-io/terratest#1189](gruntwork-io/terratest#1189) [#1189](https://github.com/estahn/k8s-image-swapper/issues/1189) [#1186](https://github.com/estahn/k8s-image-swapper/issues/1186) * **deps:** Bump github.com/gruntwork-io/terratest from 0.40.23 to 0.40.24 ([#378](#378)) ([e57939d](e57939d)), closes [gruntwork-io/terratest#1191](gruntwork-io/terratest#1191) [#1191](https://github.com/estahn/k8s-image-swapper/issues/1191) * **deps:** Bump github.com/slok/kubewebhook/v2 from 2.3.0 to 2.5.0 ([#372](#372)) ([249a996](249a996)), closes [#218](#218) [#217](#217) [#187](#187) * **deps:** Bump github.com/spf13/cobra from 1.5.0 to 1.6.0 ([#373](#373)) ([39cfd45](39cfd45)), closes [#1003](#1003) [#1802](https://github.com/estahn/k8s-image-swapper/issues/1802) [#1760](https://github.com/estahn/k8s-image-swapper/issues/1760) [#1707](https://github.com/estahn/k8s-image-swapper/issues/1707) [#1813](https://github.com/estahn/k8s-image-swapper/issues/1813) [#1788](https://github.com/estahn/k8s-image-swapper/issues/1788) [#1621](https://github.com/estahn/k8s-image-swapper/issues/1621) [#1467](https://github.com/estahn/k8s-image-swapper/issues/1467) [#1643](https://github.com/estahn/k8s-image-swapper/issues/1643) [#1643](https://github.com/estahn/k8s-image-swapper/issues/1643) [#1762](https://github.com/estahn/k8s-image-swapper/issues/1762) [#1771](https://github.com/estahn/k8s-image-swapper/issues/1771) [#1776](https://github.com/estahn/k8s-image-swapper/issues/1776) [#1766](https://github.com/estahn/k8s-image-swapper/issues/1766) [#1782](https://github.com/estahn/k8s-image-swapper/issues/1782) [#1803](https://github.com/estahn/k8s-image-swapper/issues/1803) [#1783](https://github.com/estahn/k8s-image-swapper/issues/1783) [#1387](https://github.com/estahn/k8s-image-swapper/issues/1387) [#1792](https://github.com/estahn/k8s-image-swapper/issues/1792) [#1744](https://github.com/estahn/k8s-image-swapper/issues/1744) [#1748](https://github.com/estahn/k8s-image-swapper/issues/1748) [#1726](https://github.com/estahn/k8s-image-swapper/issues/1726) [#1656](https://github.com/estahn/k8s-image-swapper/issues/1656) [#1779](https://github.com/estahn/k8s-image-swapper/issues/1779) [#1741](https://github.com/estahn/k8s-image-swapper/issues/1741) [#1742](https://github.com/estahn/k8s-image-swapper/issues/1742) [#1745](https://github.com/estahn/k8s-image-swapper/issues/1745) [#1759](https://github.com/estahn/k8s-image-swapper/issues/1759) [#1772](https://github.com/estahn/k8s-image-swapper/issues/1772) [#1819](https://github.com/estahn/k8s-image-swapper/issues/1819) [#1800](https://github.com/estahn/k8s-image-swapper/issues/1800) [#1809](https://github.com/estahn/k8s-image-swapper/issues/1809) [#1804](https://github.com/estahn/k8s-image-swapper/issues/1804) [#1467](https://github.com/estahn/k8s-image-swapper/issues/1467) [#1003](#1003) [#1813](https://github.com/estahn/k8s-image-swapper/issues/1813) [#1621](https://github.com/estahn/k8s-image-swapper/issues/1621) [#1792](https://github.com/estahn/k8s-image-swapper/issues/1792) [#1788](https://github.com/estahn/k8s-image-swapper/issues/1788) [#1815](https://github.com/estahn/k8s-image-swapper/issues/1815) [#1819](https://github.com/estahn/k8s-image-swapper/issues/1819) [#1707](https://github.com/estahn/k8s-image-swapper/issues/1707) [#1760](https://github.com/estahn/k8s-image-swapper/issues/1760) * **deps:** Bump github.com/spf13/cobra from 1.6.0 to 1.6.1 ([#384](#384)) ([ffe3ef6](ffe3ef6)), closes [#1839](https://github.com/estahn/k8s-image-swapper/issues/1839) [#1841](https://github.com/estahn/k8s-image-swapper/issues/1841) * **deps:** Bump github.com/stretchr/testify from 1.8.0 to 1.8.1 ([#379](#379)) ([a0e1429](a0e1429)), closes [#1283](https://github.com/estahn/k8s-image-swapper/issues/1283) * **deps:** Bump golangci/golangci-lint-action from 3.2.0 to 3.3.0 ([#375](#375)) ([abcf765](abcf765)), closes [#586](#586) [#584](#584) [#582](#582) [#580](#580) [#578](#578) [#576](#576) [#577](#577) [#575](#575) * **deps:** Bump k8s.io/api from 0.25.1 to 0.25.3 ([#366](#366)) ([c233527](c233527)), closes [#112808](https://github.com/estahn/k8s-image-swapper/issues/112808) [cheftako/automated-cherry-pick-of-#112689](https://github.com/cheftako/automated-cherry-pick-of-/issues/112689)
| @@ -86,5 +93,9 @@ func (g *TaskGroupWithContext) Wait() error { | |||
| case <-g.ctx.Done(): | |||
| } | |||
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You have to return g.ctx.Err(), otherwise we will get a data race.
ctx, cancel := context.WithTimeout(ctx, time.Second)
defer cancel()
g, gctx := pool.GroupContext(ctx)
g.Submit(func() error { select { case <-gctx.Done(): return gctx.Err() }})
err := g.Wait() // err == nil
Owner
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Oh, good catch @NOMORECOFFEE!. If you don't mind, please open a PR with suggested changes and I can review it later. Otherwise I can send one. Thank you! 🙌
Owner
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I just released v1.8.3 with a fix for this, please check it out and let me know if you find anything. Thank you!
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Context
That is not stated whether
Wait()&Submit()forTaskGroupWithContextare allowed for usage from different execution threads. As end user I expected that it is.Problem
leads to race condition because of non-synchronized (write & read) operations to
.err.The problem is detectable in 100% cases by a built-in race checker.
PR
The change introduces usage of mutex to synchronize access to this variable at the above mentioned code flows.