unstable test TestMemTracker4InsertAndReplaceExec

[hawkingrei]

Bug Report

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1. Minimal reproduce step (Required)

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

3. What did you see instead (Required)

    oom_test.go:137: 

        	Error Trace:	executor/test/oomtest/oom_test.go:137

        	Error:      	Not equal: 

        	            	expected: ""

        	            	actual  : "dispatch task loop start"

        	            	

        	            	Diff:

        	            	--- Expected

        	            	+++ Actual

        	            	@@ -1 +1 @@

        	            	-

        	            	+dispatch task loop start

        	Test:       	TestMemTracker4InsertAndReplaceExec

4. What is your TiDB version? (Required)

[hawkingrei]

https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftidb%2Fghpr_unit_test/detail/ghpr_unit_test/27177/pipeline