piup client fresh install leads to SIGSEGV

[GerroDen]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. What did you do?

It's running on Macos 26.0.1 (25A362)

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1. Install TiUP with curl --proto '=https' --tlsv1.2 -sSf https://tiup-mirrors.pingcap.com/install.sh | sh.
2. Run tiup playground in new terminal
3. Run tiup client in new terminal

---

2. What did you expect to see?

I think there will be a mysql prompt? I've never seen it running.

3. What did you see instead?

❯ tiup client
Starting component client: /Users/lkimmel/.tiup/components/client/v1.16.3/tiup-client
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x605fa95]

goroutine 1 [running]:
main.isInstanceAlive({0xc0002e2640?, 0x1?}, {0xc0002d48d0?, 0x2e27ea388edd95a?})
	github.com/pingcap/tiup/components/client/main.go:134 +0x35
main.scanEndpoint({0xc00002400a, 0x14})
	github.com/pingcap/tiup/components/client/main.go:121 +0x105
main.connect({0x0, 0x0})
	github.com/pingcap/tiup/components/client/main.go:72 +0x4e
main.execute.func1(0xc0000ee700?, {0x6a62ec0?, 0x4?, 0x60ce7c8?})
	github.com/pingcap/tiup/components/client/main.go:60 +0x91
github.com/spf13/cobra.(*Command).execute(0xc0002c4008, {0xc000020080, 0x0, 0x0})
	github.com/spf13/[email protected]/command.go:916 +0x85c
github.com/spf13/cobra.(*Command).ExecuteC(0xc0002c4008)
	github.com/spf13/[email protected]/command.go:1044 +0x3a5
github.com/spf13/cobra.(*Command).Execute(...)
	github.com/spf13/[email protected]/command.go:968
main.execute()
	github.com/pingcap/tiup/components/client/main.go:64 +0x59
main.main()
	github.com/pingcap/tiup/components/client/main.go:40 +0x13

4. What version of TiUP are you using (tiup --version)?

❯ tiup --version
1.16.3 v1.16.2-release-1.16
Go Version: go1.24.1
Git Ref: release-1.16
GitHash: a290cbff372666163e686364bb63c24bd0638dbc

[ti-chi-bot[bot]]

Welcome @GerroDen! It looks like this is your first issue to pingcap/tiup 🎉