util: fix data race in sqlkiller

[lcwangchao]

What problem does this PR solve?

Issue Number: close #55467

Problem Summary:

fix data race in sqlkiller

What changed and how does it work?

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

[tiprow]

Hi @lcwangchao. Thanks for your PR.

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[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 74.8961%. Comparing base (2761e91) to head (fc5cef3).
Report is 9 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #55581        +/-   ##
================================================
+ Coverage   72.9022%   74.8961%   +1.9938%     
================================================
  Files          1577       1577                
  Lines        440922     440960        +38     
================================================
+ Hits         321442     330262      +8820     
+ Misses        99735      90478      -9257     
- Partials      19745      20220       +475     

Flag	Coverage Δ
integration	49.1837% <57.1428%> (?)
unit	71.9807% <85.7142%> (+0.0126%)	⬆️

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

Components	Coverage Δ
dumpling	52.9567% <ø> (ø)
parser	∅ <ø> (∅)
br	52.5344% <ø> (+6.5784%)	⬆️

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, wshwsh12

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-22 04:28:43.994947744 +0000 UTC m=+412519.129397866: ☑️ agreed by hawkingrei.
• 2024-08-22 05:34:31.292913464 +0000 UTC m=+416466.427363585: ☑️ agreed by wshwsh12.