goleak in the com_github_tikv_client_go_v2/config/retry/backoff.go:122

[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)

goleak: Errors on successful test run: found unexpected goroutines:
[Goroutine 712329 in state semacquire, with sync.runtime_Semacquire on top of the stack:
sync.runtime_Semacquire(0xc000fbf350?)
	GOROOT/src/runtime/sema.go:62 +0x25
sync.(*WaitGroup).Wait(0xc062792cc0?)
	GOROOT/src/sync/waitgroup.go:116 +0x48
github.com/pingcap/tidb/pkg/store/copr.(*copIteratorTaskSender).run(0xc0627896d0, 0x8)
	pkg/store/copr/coprocessor.go:914 +0x24b
created by github.com/pingcap/tidb/pkg/store/copr.(*copIterator).open in goroutine 701406
	pkg/store/copr/coprocessor.go:881 +0x518
 Goroutine 712328 in state select, with github.com/tikv/client-go/v2/config/retry.(*Config).createBackoffFn.newBackoffFn.func2 on top of the stack:
github.com/tikv/client-go/v2/config/retry.(*Config).createBackoffFn.newBackoffFn.func2({0x3528c90, 0xc0627a6480}, 0xffffffffffffffff)
	external/com_github_tikv_client_go_v2/config/retry/config.go:205 +0x505
github.com/tikv/client-go/v2/config/retry.(*Backoffer).BackoffWithCfgAndMaxSleep(0xc0626c6870, 0xc001768270, 0x24781a0?, {0x34f5680, 0xc0626de3d8})
	external/com_github_tikv_client_go_v2/config/retry/backoff.go:195 +0x66d
github.com/tikv/client-go/v2/config/retry.(*Backoffer).Backoff(0xc0626c6870, 0xc001768270, {0x34f5680, 0xc0626de3d8})
	external/com_github_tikv_client_go_v2/config/retry/backoff.go:122 +0x251
github.com/tikv/client-go/v2/internal/locate.(*replicaSelector).onServerIsBusy(0xc0626c6900, 0xc062689c00?, 0xc0626c4480?, 0x297741d?, 0xe?)
	external/com_github_tikv_client_go_v2/internal/locate/replica_selector.go:534 +0x2cf
github.com/tikv/client-go/v2/internal/locate.(*RegionRequestSender).onRegionError(0xc0626a36c0, 0xc0626c6870, 0xc0626c4480, 0xc062689c00, 0xc0626ae820)
	external/com_github_tikv_client_go_v2/internal/locate/region_request.go:1598 +0x994
github.com/tikv/client-go/v2/internal/locate.(*RegionRequestSender).SendReqCtx(0xc0626a36c0, 0xc0626c6870, 0xc062689c00, {0x2, 0x1, 0x1}, 0xdf8475800, 0x0, {0xc0626cfb88, 0x0, ...})
	external/com_github_tikv_client_go_v2/internal/locate/region_request.go:907 +0x169d
github.com/tikv/client-go/v2/txnkv/txnsnapshot.(*ClientHelper).SendReqCtx(0xc062671ec0, 0x11a00000000?, 0xc062689c00, {0x11800000000?, 0x11700000000?, 0x11600000000?}, 0x11500000000?, 0x0?, {0x0, 0x0}, ...)
	external/com_github_tikv_client_go_v2/txnkv/txnsnapshot/client_helper.go:146 +0x245
github.com/pingcap/tidb/pkg/store/copr.(*copIteratorWorker).handleTaskOnce(0xc0627950a0, 0xc056840388, 0xc061aa9a40, 0xc061aa9a40?)
	pkg/store/copr/coprocessor.go:1265 +0xc3d
github.com/pingcap/tidb/pkg/store/copr.(*copIteratorWorker).handleTask(0xc0627950a0, {0x3528c90, 0xc0627a6480}, 0x6800000000?, 0xc06267cea0)
	pkg/store/copr/coprocessor.go:1155 +0x18e
github.com/pingcap/tidb/pkg/store/copr.(*copIteratorWorker).run(0xc0627950a0, {0x3528c90, 0xc0627a6480})
	pkg/store/copr/coprocessor.go:816 +0x116
created by github.com/pingcap/tidb/pkg/store/copr.(*copIterator).open in goroutine 701406
	pkg/store/copr/coprocessor.go:863 +0xe5
] 

4. What is your TiDB version? (Required)

[hawkingrei]

https://tiprow.hawkingrei.com/view/gs/pingcapprow/pr-logs/pull/pingcap_tidb/55447/fast_test_tiprow/1825385641907589120#1:build-log.txt%3A6972