runtime: skip TestPingPongHog in race mode

TestPingPongHog tests properties of the scheduler.
But the race detector intentionally does randomized scheduling,
so the test is not applicable.

Fixes #38266

Change-Id: Ib06aa317b2776cb1faa641c4e038e2599cf70b2d
Reviewed-on: https://go-review.googlesource.com/c/go/+/227344
Run-TryBot: Josh Bleecher Snyder <[email protected]>
TryBot-Result: Gobot Gobot <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>

Author: josharian

src/runtime/proc_test.go

@@ -6,6 +6,7 @@ package runtime_test
 
 import (
 	"fmt"
+	"internal/race"
 	"math"
 	"net"
 	"runtime"
@@ -422,6 +423,11 @@ func TestPingPongHog(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping in -short mode")
 	}
+	if race.Enabled {
+		// The race detector randomizes the scheduler,
+		// which causes this test to fail (#38266).
+		t.Skip("skipping in -race mode")
+	}
 
 	defer runtime.GOMAXPROCS(runtime.GOMAXPROCS(1))
 	done := make(chan bool)