disable_pidfd_on_android.patch

From 7115c480196f4bdcbdae5e14ebaa4510540680e9 Mon Sep 17 00:00:00 2001
From: Brad Fitzpatrick <bradfitz@tailscale.com>
Date: Tue, 27 Jan 2026 09:52:22 -0800
Subject: [PATCH] [tailscale] os: disable pidfd on Android

Updates tailscale/tailscale#13452
Updates golang/go#70508
Updates tailscale/go#99
---
 src/os/pidfd_linux.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/os/pidfd_linux.go b/src/os/pidfd_linux.go
index 796d8c018c7f2a..5cdbf1175e0db5 100644
--- a/src/os/pidfd_linux.go
+++ b/src/os/pidfd_linux.go
@@ -138,6 +138,16 @@ func (p *Process) pidfdSendSignal(s syscall.Signal) error {
 
 // pidfdWorks returns whether we can use pidfd on this system.
 func pidfdWorks() bool {
+	if runtime.GOOS == "android" {
+		// Tailscale-specific workaround since https://github.com/golang/go/pull/69543/commits/aad6b3b32c81795f86bc4a9e81aad94899daf520
+		// does not solve https://github.com/golang/go/issues/69065 for Android apps using Go libraries.
+		//
+		// See: https://github.com/tailscale/tailscale/issues/13452
+		//
+		// For now (2025-04-09), we'll just disable pidfd
+		// on all Android releases.
+		return false
+	}
 	return checkPidfdOnce() == nil
 }