unstable test FAIL: cte_test.go:110: CTETestSuite.TestSpillToDisk

[ClSlaid]

Bug Report

1. Minimal reproduce step (Required)

1. make some contribution to tidb
2. test may fail in check_dev_2.
3. take a look in detail.

2. What did you expect to see? (Required)

No FAIL All PASS.

3. What did you see instead (Required)

[2021-06-02T07:14:11.584Z] FAIL: cte_test.go:110: CTETestSuite.TestSpillToDisk
[2021-06-02T07:14:11.584Z]
[2021-06-02T07:14:11.584Z] cte_test.go:137:
[2021-06-02T07:14:11.584Z]     c.Assert(diskTracker.MaxConsumed(), check.Greater, int64(0))
[2021-06-02T07:14:11.584Z] ... compare_one int64 = 0
[2021-06-02T07:14:11.584Z] ... compare_two int64 = 0
[2021-06-02T07:14:11.584Z]

4. What is your TiDB version? (Required)

following master.

[guo-shaoge]

Trying to merge it. #25035

[guo-shaoge]

dup with #25034

[ti-srebot]

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