From 6f75647c0e4a85ca33cf69add4721cbbe7d9976b Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@tailscale.com>
Date: Tue, 1 Apr 2025 04:01:00 -0700
Subject: [PATCH] net/netcheck: avoid ICMP unimplemented log spam on Plan 9

Updates #5794

Change-Id: Ia6b2429d57b79770e4c278f011504f726136db5b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
---
 net/netcheck/netcheck.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/netcheck/netcheck.go b/net/netcheck/netcheck.go
index 74c866d92..5f4ab41c2 100644
--- a/net/netcheck/netcheck.go
+++ b/net/netcheck/netcheck.go
@@ -1191,6 +1191,10 @@ func (c *Client) measureAllICMPLatency(ctx context.Context, rs *reportState, nee
 	if len(need) == 0 {
 		return nil
 	}
+	if runtime.GOOS == "plan9" {
+		// ICMP isn't implemented.
+		return nil
+	}
 	ctx, done := context.WithTimeout(ctx, icmpProbeTimeout)
 	defer done()