executor: fix data race in testChunkSizeControlSuite (#9676)
executor: fix data race in testChunkSizeControlSuite (#9676)


c4pt0r/tidb,c4pt0r/tidb,pingcap/tidb,pingcap/tidb,ngaut/tidb,c4pt0r/tidb,c4pt0r/tidb,Cofyc/tidb,qiuyesuifeng/tidb,ngaut/tidb,pingcap/tidb,pingcap/tidb,cosmtrek/tidb,XuHuaiyu/tidb,ngaut/tidb,Cofyc/tidb,ngaut/tidb,ngaut/tidb,kyle-wang/tidb,kyle-wang/tidb,kyle-wang/tidb,c4pt0r/tidb,c4pt0r/tidb,kyle-wang/tidb,kyle-wang/tidb,pingcap/tidb,EvilMcJerkface/tidb,coocood/tidb,pingcap/tidb,EvilMcJerkface/tidb,ngaut/tidb,XuHuaiyu/tidb,kyle-wang/tidb,coocood/tidb,cosmtrek/tidb,ming-relax/tidb,ming-relax/tidb,qiuyesuifeng/tidb