Brad Fitzpatrick
1c778640ea
If the network comes up during the few milliseconds NewLocalBackend takes, tailscaled starts with its control client paused and never unpauses: the interface state snapshot was taken before the netmon subscription (kept late since #17252), so a change published in between reached nobody. #21261 hit it on fast-booting NixOS microVMs, and it was behind the natlab TestEasyEasy CI flake, where a gokrazy node's DHCP lease landed in that window and "tailscale up" hung at "awaiting unpause". Re-read netmon's state after subscribing rather than subscribing before the snapshot (as #21281 proposed), which would bring back the #17252 data race and let a fresh delta be overwritten by the stale snapshot. netmon.New and the userspace engine had the same shape of gap between their snapshot and their subscription; close those too. Under CPU pressure the hang reproduced in 1 of 22 TestEasyEasy runs before and 0 of 120 after. Thanks to @c-vigo for the detailed diagnosis in #21261 and to @zzz-yu for pointing out this problem and proposing a fix in #21281! Fixes #21261 Updates #14902 Updates #19126 Updates #deflake Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com> Change-Id: Ifa21f8055a85321a5afda7800140fc5045c6ce08
Tailscale
Private WireGuard® networks made easy
Overview
This repository contains the majority of Tailscale's open source code.
Notably, it includes the tailscaled daemon and
the tailscale CLI tool. The tailscaled daemon runs on Linux, Windows,
macOS, and to varying degrees
on FreeBSD and OpenBSD. The Tailscale iOS and Android apps use this repo's
code, but this repo doesn't contain the mobile GUI code.
Other Tailscale repos of note:
- the Android app is at https://github.com/tailscale/tailscale-android
- the Synology package is at https://github.com/tailscale/tailscale-synology
- the QNAP package is at https://github.com/tailscale/tailscale-qpkg
- the Chocolatey packaging is at https://github.com/tailscale/tailscale-chocolatey
For background on which parts of Tailscale are open source and why, see https://tailscale.com/opensource/.
Using
We serve packages for a variety of distros and platforms at https://pkgs.tailscale.com.
Other clients
The macOS, iOS, and Windows clients use the code in this repository but additionally include small GUI wrappers. The GUI wrappers on non-open source platforms are themselves not open source.
Building
We always require the latest Go release, currently Go 1.27. (While we build releases with our Go fork, its use is not required.)
go install tailscale.com/cmd/tailscale{,d}
If you're packaging Tailscale for distribution, use build_dist.sh
instead, to burn commit IDs and version info into the binaries:
./build_dist.sh tailscale.com/cmd/tailscale
./build_dist.sh tailscale.com/cmd/tailscaled
If your distro has conventions that preclude the use of
build_dist.sh, please do the equivalent of what it does in your
distro's way, so that bug reports contain useful version information.
Bugs
Please file any issues about this code or the hosted service on the issue tracker.
Contributing
PRs welcome! But please file bugs. Commit messages should reference bugs.
We require Developer Certificate of
Origin
Signed-off-by lines in commits.
See commit-messages.md (or skim git log) for our commit message style.
About Us
Tailscale is primarily developed by the people at https://github.com/orgs/tailscale/people. For other contributors, see:
- https://github.com/tailscale/tailscale/graphs/contributors
- https://github.com/tailscale/tailscale-android/graphs/contributors
Legal
WireGuard is a registered trademark of Jason A. Donenfeld.