test: fix data race in scan locks

[3pointer]

What problem does this PR solve?

Issue Number: close #57298
Problem Summary:
As title.

What changed and how does it work?

add mutex for race functions.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

Skipping CI for Draft Pull Request.
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You can still manually trigger a test run with /test all

[tiprow]

Hi @3pointer. Thanks for your PR.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.5687%. Comparing base (3047328) to head (86f1aba).
Report is 110 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57299        +/-   ##
================================================
+ Coverage   72.9496%   74.5687%   +1.6191%     
================================================
  Files          1667       1682        +15     
  Lines        460833     460933       +100     
================================================
+ Hits         336176     343712      +7536     
+ Misses       103971      95920      -8051     
- Partials      20686      21301       +615     

Flag	Coverage Δ
integration	46.6652% <ø> (?)
unit	72.2950% <ø> (-0.0480%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	52.7673% <ø> (ø)
parser	∅ <ø> (∅)
br	60.7815% <ø> (+15.7077%)	⬆️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BornChanger, YuJuncen

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• br/OWNERS [BornChanger,YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-11 12:32:57.079839719 +0000 UTC m=+273139.270708717: ☑️ agreed by YuJuncen.
• 2024-11-11 13:24:52.918363342 +0000 UTC m=+276255.109232344: ☑️ agreed by BornChanger.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #57630.