*: fix resource leak in select for update when 'tidb_low_resolution_tso' is set (#57012)

[ti-chi-bot]

This is an automated cherry-pick of #57012

What problem does this PR solve?

Issue Number: close #55468

Problem Summary:

The cause of that DATA RACE is a resource leak.

After executing "select * from low_resolution_tso for update" when tidb_low_resolution_tso is on,
error is return but the executor is not closed, so the background goroutine leak.
The leaked goroutine still referencing session ctx.
So when the next SQL is executed, it races visiting the session ctx.

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

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (release-8.5@59c1723). Learn more about missing BASE report.

Additional details and impacted files

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Flag	Coverage Δ
integration	38.9733% <0.0000%> (?)
unit	74.1930% <50.0000%> (?)

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

Components	Coverage Δ
dumpling	52.9478% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	53.5460% <0.0000%> (?)

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Defined2014, tiancaiamao

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-15 10:06:06.324276442 +0000 UTC m=+609928.515145439: ☑️ agreed by Defined2014.
• 2024-11-19 03:29:44.32862211 +0000 UTC m=+931746.519491109: ☑️ agreed by tiancaiamao.

[Defined2014]

/retest

[tiancaiamao]

/retest

[tiancaiamao]

/retest