flaky test TestIndexMergeUpgradeFrom400To540 in session pkg

[wuhuizuo]

Bug Report

Flaky runs happened 23 times between "2023-09-09" AND "2023-09-16"

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[wuhuizuo]

Flaky runs happened 37 times between "2023-11-10" AND "2023-11-22"

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[wuhuizuo]

/reopen

[ti-chi-bot]

@wuhuizuo: Reopened this issue.

In response to this:

/reopen

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[wuhuizuo]

branch	case name	report time	build url
master	TestIndexMergeUpgradeFrom400To540Disable	November 30, 2023, 6:14 PM	https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/38710/
master	TestIndexMergeUpgradeFrom400To540Disable	November 24, 2023, 9:36 PM	https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/38281/

[wuhuizuo]

branch case name report time build url
master TestIndexMergeUpgradeFrom400To540Disable November 30, 2023, 6:14 PM https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/38710/
master TestIndexMergeUpgradeFrom400To540Disable November 24, 2023, 9:36 PM https://do.pingcap.net/jenkins/job/pingcap/job/tidb/job/ghpr_unit_test/38281/

Not happened after 2023-11-30