br: fix race in test Test(Split|Restore)Failed (#33313)

[ti-srebot]

cherry-pick #33313 to release-5.3
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/33339

After apply modifications, you can push your change to this PR via:

git push [email protected]:ti-srebot/tidb.git pr/33339:release-5.3-e2ad790a2979

---

Signed-off-by: Yu Juncen [email protected]

What problem does this PR solve?

Issue Number: close #33310

Problem Summary:

See the issue.

What is changed and how it works?

Added a lock for eliminating the race condition.

Check List

Tests

• Unit test

• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

(This is a fix over test cases. I guess there is no meaning for adding release notes...)

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• 3pointer
• YuJuncen

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[ti-srebot]

/run-all-tests

[ti-srebot]

@YuJuncen you're already a collaborator in bot's repo.

[3pointer]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: d3c1758

[sre-bot]

Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/4d55aa6ee8511646ea3b9f3afa0804d733fa0aa6

[ti-chi-bot]

@ti-srebot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

If the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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 ti-community-infra/tichi repository.