[2020-08-20T10:19:01.244Z] [2020/08/20 17:40:37.026 +08:00] [FATAL] [log.go:292] [panic] [recover="\"invalid memory address or nil pointer dereference\""] [stack="github.com/pingcap/log.Fatal\n\t/home/jenkins/agent/workspace/build_pd_multi_branch_master/go/pkg/mod/github.com/pingcap/log@v0.0.0-20200511115504-543df19646ad/global.go:59\ngithub.com/tikv/pd/pkg/logutil.LogPanic\n\t/home/jenkins/agent/workspace/build_pd_multi_branch_master/go/src/github.com/pingcap/pd/pkg/logutil/log.go:292\nruntime.gopanic\n\t/usr/local/go/src/runtime/panic.go:679\nruntime.panicmem\n\t/usr/local/go/src/runtime/panic.go:199\nruntime.sigpanic\n\t/usr/local/go/src/runtime/signal_unix.go:394\nsync.(*RWMutex).RLock\n\t/usr/local/go/src/sync/rwmutex.go:48\ngithub.com/tikv/pd/server/statistics.(*RollingStoreStats).GetBytesRate\n\t/home/jenkins/agent/workspace/build_pd_multi_branch_master/go/src/github.com/pingcap/pd/server/statistics/store.go:387\ngithub.com/tikv/pd/server/statistics.(*storeStatistics).Observe\n\t/home/jenkins/agent/workspace/build_pd_multi_branch_master/go/src/github.com/pingcap/pd/server/statistics/store_collection.go:107\ngithub.com/tikv/pd/server/statistics.(*storeStatisticsMap).Observe\n\t/home/jenkins/agent/workspace/build_pd_multi_branch_master/go/src/github.com/pingcap/pd/server/statistics/store_collection.go:221\ngithub.com/tikv/pd/server/cluster.(*RaftCluster).collectMetrics\n\t/home/jenkins/agent/workspace/build_pd_multi_branch_master/go/src/github.com/pingcap/pd/server/cluster/cluster.go:1199\ngithub.com/tikv/pd/server/cluster.(*RaftCluster).runBackgroundJobs\n\t/home/jenkins/agent/workspace/build_pd_multi_branch_master/go/src/github.com/pingcap/pd/server/cluster/cluster.go:319"]