flaky test TestTiDBTrx

[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)

     result.go:49: 
        	Error Trace:	pkg/testkit/result.go:49
        	            				pkg/infoschema/test/clustertablestest/tables_test.go:1232
        	Error:      	Not equal: 
        	            	expected: "[LockWaiting]\n[Idle]\n"
        	            	actual  : "[Idle]\n[LockWaiting]\n"
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1,3 +1,3 @@
        	            	+[Idle]
        	            	 [LockWaiting]
        	            	-[Idle]
        	            	 
        	Test:       	TestTiDBTrx
        	Messages:   	sql:select state from information_schema.tidb_trx as trx  union select state from information_schema.tidb_trx as trx, args:[]

https://tiprow.hawkingrei.com/view/gs/pingcapprow/pr-logs/pull/pingcap_tidb/53899/fast_test_tiprow/1799973138344185856#1:build-log.txt%3A2367

4. What is your TiDB version? (Required)