dashboard: mark all current netbsd builders as affected by golang/go#…

…50138

Since a large fraction of Go tests invoke commands, this issue causes
noise on the builders that cannot be easily bypassed or filtered out.

Failures matching this issue have been observed on all four of the
current NetBSD builders. (The last such failure observed on a
non-NetBSD builder was on freebsd-amd64-11_4, and that builder is no
longer used; no matching failures have been observed on more recent
FreeBSD builders.)

Updates golang/go#50138.

Change-Id: Ied687a63a55407d19c5f1905e79111d302087937
Reviewed-on: https://go-review.googlesource.com/c/build/+/409595
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Run-TryBot: Bryan Mills <bcmills@google.com>
Auto-Submit: Bryan Mills <bcmills@google.com>

dashboard/builders.go

@@ -2159,11 +2159,13 @@ func init() {
 		HostType:       "host-netbsd-amd64-9_0",
 		distTestAdjust: noTestDirAndNoReboot,
 		tryBot:         explicitTrySet("sys"),
+		KnownIssues:    []int{50138},
 	})
 	addBuilder(BuildConfig{
 		Name:           "netbsd-386-9_0",
 		HostType:       "host-netbsd-386-9_0",
 		distTestAdjust: noTestDirAndNoReboot,
+		KnownIssues:    []int{50138},
 	})
 	addBuilder(BuildConfig{
 		Name:     "netbsd-arm-bsiegert",
@@ -2182,7 +2184,8 @@ func init() {
 			// The machine is slow.
 			"GO_TEST_TIMEOUT_SCALE=10",
 		},
-		FlakyNet: true,
+		FlakyNet:    true,
+		KnownIssues: []int{50138},
 	})
 	addBuilder(BuildConfig{
 		Name:           "netbsd-arm64-bsiegert",
@@ -2193,7 +2196,8 @@ func init() {
 			// The machine is slow.
 			"GO_TEST_TIMEOUT_SCALE=10",
 		},
-		FlakyNet: true,
+		FlakyNet:    true,
+		KnownIssues: []int{50138},
 	})
 	addBuilder(BuildConfig{
 		Name:           "plan9-386",