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owner(ticdc): Fix a nil pointer access bug when appending DataPatches (#4085) #4179

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owner(ticdc): Fix a nil pointer access bug when appending DataPatches (#4085) #4179

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This is an automated cherry-pick of #4085

What problem does this PR solve?

Issue Number: close #3128

What is changed and how it works?

Add nil pointer checking when we append DataPatches for ChangefeedReactorState such as PatchInfo, PatchStatus etc.

Check List

Tests

  • Unit test
  • Integration test

Release note 

Fix the potential panic issue that occurs when changefeed info is removed from etcd.

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[REVIEW NOTIFICATION]

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@ti-chi-bot ti-chi-bot added do-not-merge/cherry-pick-not-approved release-note Denotes a PR that will be considered when it comes time to generate release notes. labels Dec 31, 2021
@ti-chi-bot ti-chi-bot mentioned this pull request Dec 31, 2021
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@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick, it must first be approved by the collaborators.

AFTER it has been approved by collaborators, please ping the release team in a comment to request a cherry pick review.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

@ti-chi-bot ti-chi-bot added size/S Denotes a PR that changes 10-29 lines, ignoring generated files. status/LGT2 Indicates that a PR has LGTM 2. type/bugfix This PR fixes a bug. type/cherry-pick-for-release-4.0 This PR is cherry-picked to release-4.0 from a source PR. labels Dec 31, 2021
@ti-chi-bot ti-chi-bot added size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. and removed size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels Dec 31, 2021
@ti-chi-bot ti-chi-bot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jan 7, 2022
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@ti-chi-bot: PR needs rebase.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

@overvenus overvenus added this to the v4.0.17 milestone Jan 11, 2022
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This pull request is closed because it's related version has closed automatic cherry-picking.
If it's still needed, you can reopen it or just regenerate it using bot,
see:

You can find more details at:

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do-not-merge/cherry-pick-not-approved needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. release-note Denotes a PR that will be considered when it comes time to generate release notes. size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. status/LGT2 Indicates that a PR has LGTM 2. type/bugfix This PR fixes a bug. type/cherry-pick-for-release-4.0 This PR is cherry-picked to release-4.0 from a source PR.
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