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)

     advancer_test.go:291: 
        	Error Trace:	br/pkg/streamhelper/advancer_test.go:291
        	Error:      	An error is expected but got nil.
        	Test:       	TestClearCache
--- FAIL: TestClearCache (0.00s) 

https://tiprow.hawkingrei.com/view/gs/pingcapprow/pr-logs/pull/pingcap_tidb/51403/fast_test_tiprow/1772793599038066688#1:build-log.txt%3A1625

4. What is your TiDB version? (Required)