mcs: fix unstable panic in tso test

[lhy1024]

What problem does this PR solve?

Issue Number: Close #7429

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JmPotato
• rleungx

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[codecov]

Codecov Report

Merging #7433 (02bd44f) into master (4356aeb) will increase coverage by 0.22%.
Report is 2 commits behind head on master.
The diff coverage is 71.42%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7433      +/-   ##
==========================================
+ Coverage   74.16%   74.38%   +0.22%     
==========================================
  Files         451      451              
  Lines       49697    49724      +27     
==========================================
+ Hits        36856    36987     +131     
+ Misses       9521     9423      -98     
+ Partials     3320     3314       -6     

Flag	Coverage Δ
unittests	74.38% <71.42%> (+0.22%)	⬆️

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[lhy1024]

/merge

[ti-chi-bot]

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[ti-chi-bot]

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

Commit hash: 02bd44f