flaky test TestMemTracker4InsertAndReplaceExec

[hawkingrei]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

    oom_test.go:119: 
            Error Trace:    /home/jenkins/.tidb/tmp/63a9840cd0739f2c243bb46478607469/sandbox/linux-sandbox/7242/execroot/__main__/bazel-out/k8-fastbuild/bin/executor/oomtest/oomtest_test_/oomtest_test.runfiles/__main__/executor/oomtest/oom_test.go:119
            Error:          Not equal: 
                            expected: ""
                            actual  : "region 2 acquire 6 locks takes 72.987605ms, waitCnt 0"

                            Diff:
                            --- Expected
                            +++ Actual
                            @@ -1 +1 @@
                            -
                            +region 2 acquire 6 locks takes 72.987605ms, waitCnt 0
            Test:           TestMemTracker4InsertAndReplaceExec

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

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

[wuhuizuo]

/component test