panic in the GetAllTiDBTopology

[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)

 goroutine 11746 [running]:
net/http.(*conn).serve.func1()
	GOROOT/src/net/http/server.go:1947 +0xbe
panic({0x24b3fc0?, 0x9fee150?})
	GOROOT/src/runtime/panic.go:785 +0x132
github.com/pingcap/tidb/pkg/domain/infosync.(*InfoSyncer).GetAllTiDBTopology(0xc0084ae900, {0x35db5a0, 0xc0071f3f50})
	pkg/domain/infosync/info.go:857 +0x53
github.com/pingcap/tidb/pkg/server/handler/optimizor.handleDownloadFile({{0x2c4da7c, 0x4}, {0xc00baad220, 0x47}, {0xc0073a6738, 0x39}, 0xc0084ae900, {0x0, 0x0}, 0x2760, ...}, ...)
	pkg/server/handler/optimizor/plan_replayer.go:142 +0x23f
github.com/pingcap/tidb/pkg/server/handler/optimizor.PlanReplayerHandler.ServeHTTP({{0x3632570, 0xc008fedb30}, 0xc008170f00, 0xc0084ae900, {0x0, 0x0}, 0x2760}, {0x35c3bd0, 0xc0063c8ee0}, 0xc007897540)
	pkg/server/handler/optimizor/plan_replayer.go:84 +0x310
github.com/gorilla/mux.(*Router).ServeHTTP(0xc00a0960c0, {0x35c3bd0, 0xc0063c8ee0}, 0xc0078972c0)
	external/com_github_gorilla_mux/mux.go:212 +0x1e2
net/http.(*ServeMux).ServeHTTP(0x63c8ee0?, {0x35c3bd0, 0xc0063c8ee0}, 0xc0078972c0)
	GOROOT/src/net/http/server.go:2747 +0x1ca
github.com/pingcap/tidb/pkg/server/internal/util.CorsHandler.ServeHTTP({{0x35a2340?, 0xc00a22a0e0?}, 0xc009d3cd08?}, {0x35c3bd0?, 0xc0063c8ee0?}, 0xc00a7ff760?)
	pkg/server/internal/util/util.go:219 +0x21c
net/http.serverHandler.ServeHTTP({0xc0099c72f0?}, {0x35c3bd0?, 0xc0063c8ee0?}, 0x6?)
	GOROOT/src/net/http/server.go:3210 +0x8e
net/http.(*conn).serve(0xc00a7db5f0, {0x35db5a0, 0xc008e11320})
	GOROOT/src/net/http/server.go:2092 +0x5d0
created by net/http.(*Server).Serve in goroutine 11483
	GOROOT/src/net/http/server.go:3360 +0x485 

https://tiprow.hawkingrei.com/view/gs/pingcapprow/pr-logs/pull/pingcap_tidb/59160/fast_test_tiprow/1882374950111678464#1:build-log.txt%3A3659

4. What is your TiDB version? (Required)

[hawkingrei]

ref #43623