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Fix a racing issue in client-go UpdateTransportConfig #80284

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merged 1 commit into from Nov 12, 2019
Merged

Fix a racing issue in client-go UpdateTransportConfig #80284

merged 1 commit into from Nov 12, 2019

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danielqsj
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What type of PR is this?

/kind bug
/sig api-machinery

What this PR does / why we need it:

in k8s.io/client-go/plugin/pkg/client/auth/exec/exec.go UpdateTransportConfig(), this assignment statement will cause data race.

kubernetes/staging/src/k8s.io/client-go/plugin/pkg/client/auth/exec/exec.go

Line 194 in 5de4134

a.onRotate = d.CloseAll

Need acquire lock before to avoid it.

Which issue(s) this PR fixes:

Fixes #80269

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Fix a racing issue in client-go UpdateTransportConfig.

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

@k8s-ci-robot k8s-ci-robot added release-note Denotes a PR that will be considered when it comes time to generate release notes. kind/bug Categorizes issue or PR as related to a bug. size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. sig/api-machinery Categorizes an issue or PR as relevant to SIG API Machinery. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. needs-priority Indicates a PR lacks a `priority/foo` label and requires one. sig/auth Categorizes an issue or PR as relevant to SIG Auth. labels Jul 18, 2019
@loginakhil
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@danielqsj is it possible to add some tests so that these kind of bugs wont happen in future ?
I am not that expert in kubernetes code base, but its possible with unit tests running in parallel to capture such race conditions.

@roycaihw
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/cc @jpbetz

@k8s-ci-robot k8s-ci-robot requested a review from jpbetz July 18, 2019 20:06
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jpbetz commented Jul 18, 2019

@danielqsj Thanks for finding this. Just to confirm, are all of the other functions in this file correct? I did a quick pass and they all look okay, but it would be great if you'd check it carefully as well.

@danielqsj
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@jpbetz Other functions in this file look good.

@danielqsj
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/retest

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jpbetz commented Jul 19, 2019

/lgtm

Thanks for fixing this!

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Jul 19, 2019
@danielqsj
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Add sig-auth approvers for approving.
@kubernetes/sig-auth-proposals

@k8s-ci-robot k8s-ci-robot added the kind/design Categorizes issue or PR as related to design. label Jul 22, 2019
@mikedanese mikedanese added priority/important-soon Must be staffed and worked on either currently, or very soon, ideally in time for the next release. and removed kind/design Categorizes issue or PR as related to design. needs-priority Indicates a PR lacks a `priority/foo` label and requires one. labels Jul 24, 2019
@mikedanese mikedanese self-assigned this Jul 24, 2019
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mikedanese commented Jul 24, 2019 •
edited

This looks ok, but would like to refer it back to the linked bug.

/approve

@mikedanese mikedanese removed the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Jul 24, 2019
@k8s-ci-robot k8s-ci-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Jul 24, 2019
@liggitt
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liggitt commented Aug 28, 2019

/hold
for resolution of #80284 (comment)

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liggitt commented Sep 26, 2019

I'd also like to see a test demonstrating the bug this is fixing, if possible

@danielqsj
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@liggitt thanks for your reviewing. PR updated but I have not find an easy way to write this test case immediately.

liggitt
liggitt reviewed Oct 14, 2019
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I have not find an easy way to write this test case

I would expect a unit test that starts two goroutines that do the following and lets them run for a few seconds would probably demonstrate the bug on master:

  • make requests in a loop
  • call UpdateTransportConfig in a loop

staging/src/k8s.io/client-go/plugin/pkg/client/auth/exec/exec.go Outdated Show resolved Hide resolved
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dims commented Nov 10, 2019

/milestone v1.17

(issue #80269 is in 1.17, PR was not)

@k8s-ci-robot k8s-ci-robot added this to the v1.17 milestone Nov 10, 2019
@josiahbjorgaard
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@danielqsj Will this likely be merged by this Thursday, 5PM pacific time and close the referenced issue? Otherwise, should we move it and the related issue to v1.18?

@k8s-ci-robot k8s-ci-robot added size/M Denotes a PR that changes 30-99 lines, ignoring generated files. and removed size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. labels Nov 11, 2019
@danielqsj
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@liggitt I add a test case, but I cannot reproduce this issues by it. Need your help. Thanks

@danielqsj
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@liggitt thanks, PR updated, PTAL

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liggitt commented Nov 12, 2019

a few small final comments, then squash down to a single commit

@danielqsj
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@liggitt great thanks. PR updated and squashed. :)

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liggitt commented Nov 12, 2019

/lgtm
/approve
/hold cancel

@k8s-ci-robot k8s-ci-robot removed the do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. label Nov 12, 2019
@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Nov 12, 2019
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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danielqsj, liggitt, mikedanese

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@danielqsj
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/retest

@k8s-ci-robot k8s-ci-robot merged commit 48ddf3b into kubernetes:master Nov 12, 2019
@liggitt liggitt mentioned this pull request Jun 9, 2020
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approved Indicates a PR has been approved by an approver from all required OWNERS files. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. kind/bug Categorizes issue or PR as related to a bug. lgtm "Looks good to me", indicates that a PR is ready to be merged. priority/important-soon Must be staffed and worked on either currently, or very soon, ideally in time for the next release. release-note Denotes a PR that will be considered when it comes time to generate release notes. sig/api-machinery Categorizes an issue or PR as relevant to SIG API Machinery. sig/auth Categorizes an issue or PR as relevant to SIG Auth. size/M Denotes a PR that changes 30-99 lines, ignoring generated files.
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data race in client go
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@danielqsj @loginakhil @roycaihw @jpbetz @mikedanese @liggitt @dims @josiahbjorgaard @k8s-ci-robot @awly