node:tls: clear connecting on a TLSSocket that wraps a connected socket by robobun · Pull Request #42343 · oven-sh/bun

robobun · 2026-09-11T16:59:36Z

Problem

tls.connect({ socket }) over a connected net.Socket that cannot give up its fd reports connecting: true, pending: true, readyState: "opening" for one event-loop task. Such a socket is another TLSSocket, a Windows named pipe, or a socket with a queued write.
Nothing emits 'connect' for a socket wrapped after it connected. Since tls: end() and destroySoon() before the handshake completes now send the FIN #42181, end() or destroySoon() in that task waits for 'connect' forever: no 'finish', no 'close'.
The cause is Socket.prototype.connect (src/js/node/net.ts:2018). It clears connecting only for a transport that is not a net.Socket. For these sockets the stream-level TLS engine clears it one task later.

Fix

Clear connecting when the wrapped net.Socket has a handle and is not connecting. Node's rule: connecting = socket.connecting || !socket._handle (wrap.js#L964-L973).
connectError now destroys a wrapped socket with the error, because afterConnect drops a failure when connecting is false. A generic Duplex already lost engine failures that way.
Not fixed: an end() before the handshake completes now emits 'finish', but the FIN never goes out. That needs a second follow-up to tls: end() and destroySoon() before the handshake completes now send the FIN #42181 (see Notes).
Verified: test/js/node/tls/node-tls-connect.test.ts (2 of 5 new tests fail on main). test/js/node/tls/node-tls-namedpipes.test.ts fails on the Windows canary and passes on a Windows build of this branch. Also the tls, https, net and http2 suites (Notes).

Background

tls.connect({ socket }) has two engines. A plain connected TCP socket gives its fd to a native TLS socket, synchronously. Any other transport gets the stream-level engine (upgradeDuplexToTLS), which runs BoringSSL on the stream's events.
That engine starts from an event-loop task, after all pending process.nextTick callbacks.
connecting covers the transport. secureConnecting covers the TLS handshake.

Notes

Repro (Linux, TLS in TLS): wrap an established TLSSocket with tls.connect({ socket }) and call end() in the same tick. Events on the inner client socket:

	state after `tls.connect()`	events	peer sees the end
node v26.3.0	`connecting=false pending=false readyState=open`	`finish, secureConnect, end, close`	yes
bun 1.4.2 (before #42181)	`connecting=true pending=true readyState=opening`	`secureConnect, finish, end, close`	yes
main	`connecting=true pending=true readyState=opening`	`secureConnect`	no
this branch	`connecting=false pending=false readyState=open`	`finish, secureConnect`	no

The same rows hold on Windows for a connected named pipe (canary 81f97bb against a Windows build of this branch), and on Linux for a connected socket with a corked write. destroySoon() gives finish, close on this branch and on node, and nothing on main.

Which part is old and which is new. The wrong connecting, pending and readyState values are in every release. Anything that tests connecting and then waits for 'connect' never resumes: resetAndDestroy(), and setSocketTimeout in _http_client.ts, so a request timeout never arms over TLS in TLS. The 'finish' hang is new. Until #42181 _final always waited for the handshake, and by then the flag was clear. #42181 lets _final run at once when no write is queued, and Socket.prototype._final then waits for 'connect'.

What is still wrong after this PR (second follow-up to #42181). end() with no data, issued before the handshake completes, now emits 'finish' on these routes, but the transport never sees a FIN, so 'end' and 'close' do not follow. This covers the whole window before the handshake completes, not only the first task. A generic Duplex transport has been in this state on main since #42181 (it never reported connecting). Bun 1.4.2 closed cleanly here, because it waited for the handshake. The cause is native and outside this diff. UpgradedDuplex::shutdown (src/runtime/socket/UpgradedDuplex.rs:551) does nothing before the engine starts. Once the engine runs, SSL_shutdown during the handshake returns 1 without a close_notify, SSLWrapper::shutdown (src/uws/lib.rs:591) records the shutdown as sent, and nothing ends the stream. The fd path has the matching fallback already: us_internal_ssl_shutdown sends a bare FIN when the handshake is not done. The stream-level engine needs the same: end the transport when a shutdown arrives while the SSL is in init, and remember a shutdown that arrives before the engine starts. No PR exists for it yet.

The connectError change. A transport that has a string decoder and a buffered chunk hands the engine a string before its start task runs. The native side reports that as a connect error (ECONNREFUSED). On main the three net.Socket routes reported 'error' and 'close' only because connecting was still set. A generic Duplex reported nothing and stayed open. With the flag clear, all routes would report nothing. Now all routes report 'error' and 'close'. The error is the same connect ECONNREFUSED as before. The connectionAttemptFailed event that afterConnect emitted with undefined address and port is gone for wrapped sockets.

Writes in the same tick. end(data) worked before and still works (secureConnect, finish, end, close, the peer receives the data). Before, the write parked on connecting and the open handler drained it. Now it goes to the native handle, which buffers it until the handshake completes. A generic Duplex already used that path. Measured intact from 5 B to 4 MiB, with end(data) and with write(data), 'drain', end().

Related. #42181 is the origin of the hang. #42240 and #42235 deliver a transport's 'error' to the TLS socket. This PR does not change that delivery on any route. #36534 uses the same predicate to choose the upgrade path. #38122 and #38028 cover a wrapped socket that fails to connect and the teardown of the wrapped socket. A net.Socket that is still connecting when it is wrapped keeps connecting until its own 'connect'. A test pins that.

Tests. In node-tls-connect.test.ts: the state and 'finish' test fails on main. The Duplex case of the pre-open failure fails on main (timeout, nothing is reported). The other three pass on main and guard the new paths: a 100 kB end(data) in the same tick, a socket that is still connecting, and the pre-open failure over a TLSSocket. In node-tls-namedpipes.test.ts: the state and 'finish' test fails on the Windows canary.

Suites. test/js/node/tls/ (318 pass), vendored test-tls-* (185 of 186), test-https-* (58 of 59), test-net-* (139 of 139), test-http2-* (256 of 256), and the ws, WebSocket and fetch proxy tests. The failures are the same with and without the change: node-tls-server.test.ts "SNICallback runs even when the requested servername matches the bind hostname" (ECONNREFUSED in this container), test-https-timeout.js (hangs), test-tls-client-allow-partial-trust-chain.js (needs the node:test runner). On the Windows debug build, "should work with named pipes and tls" (400 connections) exceeds its 5 s timeout with and without the change.

Self-reviewed: kept the one-line rule as it is. Added the connectError branch and its tests, the test for a socket that is still connecting, and a multi-record payload. Rewrote the code comment around node's rule.

no test proof · iteration 0 · platform-specific test(s) that do not run on this machine, deferring to CI, which covers all platforms: test/js/node/tls/node-tls-namedpipes.test.ts

…ting tls.connect({ socket }) left connecting set for one task when the wrapped net.Socket was connected but used the stream-level TLS engine (another TLSSocket, a Windows named pipe, a socket with a queued write). Nothing emits 'connect' for a socket that was wrapped after it connected, so end(), destroySoon() and the other calls that wait for 'connect' never resumed, and 'finish' never fired. Apply node's rule: connecting = socket.connecting || !socket._handle. An engine that fails before it opens reported through afterConnect, which drops the failure when connecting is false. connectError now destroys a wrapped socket with the error directly. This also covers a generic Duplex, which lost that error before.

robobun · 2026-09-11T16:59:55Z

Status: ready for review.

How to reproduce on main (any platform): open a TLS connection, then wrap that TLSSocket with tls.connect({ socket }) and call end() in the same tick. The inner socket reports connecting=true, pending=true, readyState=opening and never emits 'finish'. On Windows the same happens over a named pipe that is already connected. Node v26.3.0 reports false, false, open and emits 'finish'.

With this branch the state matches node and 'finish' fires. The missing FIN for an end() that comes before the handshake completes is a separate follow-up to #42181. The Notes section of the description has the details.

coderabbitai · 2026-09-11T17:03:47Z

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Walkthrough

The PR updates TLS wrapping for established and connecting transports. It changes early TLS failure handling and adds coverage for sockets, duplex streams, and Windows named pipes.

Changes

TLS wrapped-stream behavior

Layer / File(s)	Summary
TLS state and failure handling `src/js/node/net.ts`	TLS wrapping preserves `connecting` only for active connecting sockets. Early TLS connection failures destroy the TLS socket with an `ExceptionWithHostPort`. Comments describe wrapped-stream and late-callback behavior.
TLS socket and stream validation `test/js/node/tls/node-tls-connect.test.ts`, `test/js/node/tls/node-tls-namedpipes.test.ts`	Tests cover established and connecting transports, same-tick `end()` behavior, handshake payload delivery, invalid pre-start string data, and Windows named-pipe event ordering.

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Description check	✅ Passed	The description clearly explains the problem, fix, scope, remaining limitation, and verification results. It does not use the template headings exactly, but it provides the required information in equ…
Title check	✅ Passed	The title clearly summarizes the primary change: clearing connecting state when a TLSSocket wraps an already connected socket.
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Inline comments:
In `@src/js/node/net.ts`:
- Around line 2020-2026: Update the TLS pre-handshake end/finalization path
around the connection-state branch and _final() so an adopted established
net.Socket is routed through the shared kCloseRawConnection cleanup after
pending TLS data is flushed, rather than only shutting down the TLS handle.
Preserve normal shutdown behavior for non-adopted or already-completed
connections.

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robobun · 2026-09-11T17:08:14Z

Reply to the review finding on net.ts:2026 (pre-handshake end() and the FIN):

The finding names the fd adoption path and kCloseRawConnection. That path sends the FIN. Measured on this branch: a wrapped plain TCP socket, a peer that never answers the ClientHello, end() in the same tick or 50 ms later. The result is 'finish', and the peer receives the ClientHello and then the FIN, the same as node v26.3.0. This PR does not change that path.
The missing FIN is real on the stream-level engine only (another TLSSocket, a named pipe, a socket with a queued write, a generic Duplex). The description lists it under "Not fixed". It comes from tls: end() and destroySoon() before the handshake completes now send the FIN #42181, it exists on main for a generic Duplex without this PR, and the fix belongs in the engine's shutdown, not in _final. This PR makes the three net.Socket routes go from "no 'finish', no FIN" to "'finish', no FIN".
I did not apply the suggested change. To close the transport from _final turns a half close into a full close.

The thread has the details and is resolved.

claude

Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.

The end(data) tests resolved the awaited promise only from the server side's 'end'. Wire its 'error' and 'close' (and the pipe server's tlsClientError) to reject, and await it together with the client's 'close', so a lost payload fails with a message instead of a timeout.

robobun · 2026-09-11T17:32:03Z

^{Updated 10:54 AM PT - Sep 11th, 2026}

✅ @robobun, your commit 5231feb2ccb0a2ffcbeaec8ac04e9f84c2dbfab3 passed in Build #114358! 🎉

🧪 To try this PR locally:

bunx bun-pr 42343

That installs a local version of the PR into your bun-42343 executable, so you can run:

bun-42343 --bun

robobun · 2026-09-11T17:32:50Z

Two follow-up commits after the reviews. Neither changes behavior.

c029978: the two end(data) tests now settle the awaited promise on every server-side failure ('error', a 'close' before 'end', and tlsClientError for the pipe server). This was the optional suggestion on node-tls-connect.test.ts. The named pipe test passes on a Windows build.
5231feb: the three new code comments in net.ts are one line each.

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test/js/node/tls/node-tls-connect.test.ts (1)
1034-1110: 🩺 Stability & Availability | 🟠 Major | 🏗️ Heavy lift

Preserve the wrapped transport’s half-close in TLSSocket.prototype._final. kPreHandshakeWrite is set only by _write, so a no-data end() bypasses the handshake wait and can emit finish without forwarding a writable half-close to a wrapped TLSSocket or generic Duplex. The peer can then wait for EOF. Defer finalization until the handshake output is flushed, then half-close the wrapped transport; do not use destroy(), which closes both directions.
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In `@test/js/node/tls/node-tls-connect.test.ts` around lines 1034 - 1110, Update
TLSSocket.prototype._final so no-data end() waits for the handshake output to
flush before completing, then invokes the wrapped transport’s half-close
operation (such as end()) for TLSSocket or generic Duplex transports. Preserve
half-close semantics and avoid destroy(), which would close both directions.

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Outside diff comments:
In `@test/js/node/tls/node-tls-connect.test.ts`:
- Around line 1034-1110: Update TLSSocket.prototype._final so no-data end()
waits for the handshake output to flush before completing, then invokes the
wrapped transport’s half-close operation (such as end()) for TLSSocket or
generic Duplex transports. Preserve half-close semantics and avoid destroy(),
which would close both directions.

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robobun · 2026-09-11T17:35:35Z

On the second CodeRabbit note (make _final wait for the handshake, then half close the transport), and its "fix before merge" banner:

This is the gap that the description lists under "Not fixed". It is on main today for a generic Duplex, with or without this PR. This PR adds no new way to reach it: on main the three net.Socket routes fail earlier, with no 'finish' at all.
To wait in _final is what bun 1.4.2 did. tls: end() and destroySoon() before the handshake completes now send the FIN #42181 removed that wait on purpose, because with a peer that never answers the ClientHello, end() then never finishes. The fd path handles both cases because its shutdown sends a bare FIN while the handshake is pending.
The stream-level engine needs that same behavior in UpgradedDuplex::shutdown and SSLWrapper::shutdown. That code is native, the named pipe path and the proxy tunnel share it, and it needs its own tests on each transport. I kept it out of this PR so that this one stays a one-rule change. The Notes section has the cause with file and line.

No code change from this note.

claude

Code review found no issues

No high-confidence issues detected in this change.

…of a connecting socket alone Follow-ups to the pending-upgrade wait in _final: - The deferred upgrade clears `connecting` once it has its handle. A stream-level engine that then failed before it opened reached afterConnect, which returns when nothing is connecting. The socket stayed open with no 'error'. connectError now destroys an upgraded socket itself (the same lines as in #42343). - A server-side wrap of a socket that is still connecting does not set kUpgradePending. A shutdown of the handle adopted from such a socket underflows the native connection count (Handlers::mark_inactive), so end() keeps the early 'finish' there, as on main. - One helper clears the flag and emits kUpgradeAttached at the three places that attach the handle. Tests: the shape where a 'connect' listener destroys the transport moves into the fixture and runs under node too. The in-process tests that pin bun-only paths are grouped, with two new ones: the engine failure above, and end() in the wrap tick with plain writes queued on the connection.

…etes (#42350) ### Problem - Regression from #42181, not released. `tls.connect({ socket: duplex })`, then `end()` before the handshake completes: `'finish'` fires, but the Duplex's `final()` never runs, so the peer sees no FIN. A healthy server then completes the handshake and the session stays open forever. Node v26.3.0 ends the Duplex at once. - `UpgradedDuplex::shutdown` (`src/runtime/socket/UpgradedDuplex.rs:551`) ran `SSL_shutdown` and nothing else. Only the close callback ended the transport, which needs the peer's close_notify or a `destroy()`. Mid-handshake, BoringSSL's `SSL_shutdown` returns 1 and does nothing. ### Fix - `shutdown()` sends the close_notify (none mid-handshake), then ends the write side of the transport. `us_internal_ssl_shutdown` does this on an fd, node's `TLSWrap::DoShutdown` on a stream. - `end()` in the turn that created the socket arrives before the engine exists and was dropped. It now sets `pending_shutdown`. `drain_pending` replays it after the staged input: first flight, then `end()`. - Correct because the engine keeps reading, and the `writableEnded` probe in `call_write_or_end` drops handshake output that follows. - Verified: `test/js/node/tls/node-tls-connect.test.ts`. 7 new cells fail on main, 6 assert the same report on node v26.3.0. Self-reviewed: 16 concerns raised, 13 addressed, 3 need no change. Remaining gaps: notes. ### Background - Bun has three TLS engines. `openssl.c` drives a socket on its fd. `UpgradedDuplex` runs an `SSLWrapper` over a `stream.Duplex` through `duplex.write()` and `duplex.end()`. `WindowsNamedPipe` does the same over a pipe. Only `UpgradedDuplex` changes. - node:net's `_final`, the shutdown hook of the writable side, calls `handle.shutdown()`: `UpgradedDuplex::shutdown` here. `'finish'` follows its callback. - The engine for a Duplex starts on a later event-loop turn. `drain_pending` replays what arrived before. <details><summary>Notes</summary> **Reports.** The fixture `test/js/node/tls/tls-shutdown-before-handshake-fixture.mjs` runs on both runtimes. "same turn" means the call is made in the turn that created the socket, before bun's engine exists. "after first flight" means the engine wrote its ClientHello and waits. | cell | node v26.3.0 | main | this branch | | --- | --- | --- | --- | | `end()`, stalled peer, same turn | ClientHello, `final()`, FIN, `finish` | `finish`, no FIN (times out) | same as node | | `end()`, stalled peer, after first flight | same | `finish`, no FIN (times out) | same as node | | `destroySoon()`, after first flight | `final()`, FIN, `finish`, `close` | transport destroyed, no `final()` | same as node | | `destroySoon()`, same turn | ClientHello, `final()`, FIN, `finish`, `close` | transport destroyed, no ClientHello, no `final()` | unchanged, see below | | `end()`, healthy TLS server, same turn | server: `tlsClientError ECONNRESET`, client closes | server: `secureConnection`, session left open | same as node | | server-side `TLSSocket` over a Duplex, `end()` same turn | `final()`, FIN | no FIN (times out) | same as node | | server-side, ClientHello already buffered | aborts: `ERR_INTERNAL_ASSERTION` in `JSStreamSocket.doWrite` | no FIN | server flight, then FIN (bun-only cell) | | `end()` after the handshake, server does not answer the close_notify | `final()` at once | `final()` never runs | same as node | The healthy-server cell on bun 1.4.3 (before #42181): `_final` waited for the handshake, so the log is `secureConnect`, `finish`, close_notify, `final()`, `close`. Late, but closed. #42181 removed that wait for the case with no queued write, which is right for the fd engine, where `us_internal_ssl_shutdown` sends the FIN. The stream engine had no equivalent. **Behaviour change after the handshake.** `end()` now ends the transport right after the close_notify. Before, the transport was ended only when the peer's close_notify arrived. With a peer that does not answer (a server with `allowHalfOpen`), the transport was never ended. Node ends it at once. Cell: `duplex-end-established`. **Against a healthy server, client side.** Node's engine also completes its half of the handshake after the FIN and writes its last flight into the ended stream, so node's client emits `secureConnect` and then `ERR_STREAM_WRITE_AFTER_END`. Bun drops that write (the `writableEnded` probe) and emits neither. The cell does not assert those two events. The server side is identical. **Not covered here.** - `destroySoon()` in the creating turn over a Duplex. Committed as an `it.failing` cell for bun. `endNT` (`src/js/node/net.ts:245`) calls the `_final` callback right after `shutdown()`, so `'finish'` fires before the engine exists, `destroySoon()`'s `destroy()` runs, and `_destroy` destroys the transport. Node completes the shutdown in the `stream.end()` callback, so `'finish'` comes after the transport's `final()`. Same on 1.4.3. The same cause puts `'finish'` ahead of the transport's `'finish'` when the transport's write is asynchronous. Gating `'finish'` on the transport is a separate change in `net.ts`. - `WindowsNamedPipe::shutdown` with TLS (`tls.connect({ path: pipe })`) has the same shape: `SSL_shutdown` only. `writer.end()` there closes the whole pipe, read side included, so it needs the `uv_shutdown` half-close from #39727 first. - `tlsSocketFinal` in `src/js/node/_http2_upgrade.ts` ends its engine with `handle.end()`, a full close, not `shutdown()`. Not changed. - `end()` in the creating turn when the transport is a `net.Socket` (unflushed writes, named pipe): `Socket.prototype._final` parks on `'connect'`, which an upgraded socket never emits, so `shutdown()` is never reached. #42343 clears `connecting` for such a transport and #42340 emits the event. `end()` before the fd handle is attached is #42339. #42343 names the missing FIN on this engine as its open follow-up: that is this change. With the engine started, those transports get the FIN from this change (checked by hand with a net.Socket that has 4 MB of unflushed writes). **Replay order.** The pending shutdown runs after the staged bytes and EOF. A server-side socket that was handed a buffered ClientHello answers it first, so the client gets the server's flight and then the FIN. The first version replayed the shutdown first and dropped that flight. **Suites run with the debug build:** all of `test/js/node/tls/`, `test/js/node/net/`, `test/js/node/http2/`, `test/js/bun/net/socket.test.ts`, `socket-retention.test.ts`, `node-http-connect.test.ts`, `ws.test.ts`, `websocket-proxy.test.ts`, and 223 vendored `test-tls-*`, `test-https-*`, `test-http2-generic-streams*` scripts (222 exit 0). Every failure also fails on a debug build of main: tests that need public DNS or an IPv4 `localhost`, `test-https-timeout.js` (hangs on debug builds with and without this change), and `test-tls-client-allow-partial-trust-chain.js` (a `node:test` file). </details>  --- **[human-review]** gate passed · iteration 1 · 3 files touched <details><summary>fails on main (without fix)</summary> ```console ASAN without fix: 7 failed, 18 skipped $ BUN_DEBUG_QUIET_LOGS=1 bun scripts/build.ts --profile=debug --quiet test "--reporter=junit" "--reporter-outfile=/tmp/pr_gate.xml" test/js/node/tls/node-tls-connect.test.ts bun test v1.4.3 (4ff9193) test/js/node/tls/node-tls-connect.test.ts: (pass) should have checkServerIdentity [2.90ms] (pass) should thow ECONNRESET if FIN is received before handshake [362.75ms] (pass) initializes authorizationError to null in the TLSSocket constructor [12.06ms] (pass) setMaxSendFragment mirrors OpenSSL's [512, 16384] acceptance without throwing [173.06ms] (pass) should be able to grab the JSStreamSocket constructor [21.30ms] (skip) tls.connect > should work with alpnProtocols (pass) tls.connect > Bun.serve() should work with tls and Bun.file() [120.40ms] (pass) tls.connect > should have peer certificate when using self asign certificate [140.18ms] (skip) tls.connect > should have peer certificate (skip) tls.connect > getCipher, getProtocol, getEphemeralKeyInfo, getSharedSigalgs, getSession, exportKeyingMaterial and isSessionReused should work (skip) tls.connect > should process options correctly when connect is called with only options (skip) tls.connect > should process port ... (truncated) release without fix: 11 failed, 18 skipped bun test v1.4.3-canary.1 (4ff9193) test/js/node/tls/node-tls-connect.test.ts: (pass) should have checkServerIdentity [0.04ms] (pass) should thow ECONNRESET if FIN is received before handshake [6.73ms] (pass) initializes authorizationError to null in the TLSSocket constructor [0.18ms] (pass) setMaxSendFragment mirrors OpenSSL's [512, 16384] acceptance without throwing [4.02ms] (pass) should be able to grab the JSStreamSocket constructor [0.22ms] (skip) tls.connect > should work with alpnProtocols (pass) tls.connect > Bun.serve() should work with tls and Bun.file() [6.15ms] (pass) tls.connect > should have peer certificate when using self asign certificate [4.22ms] (skip) tls.connect > should have peer certificate (skip) tls.connect > getCipher, getProtocol, getEphemeralKeyInfo, getSharedSigalgs, getSession, exportKeyingMaterial and isSessionReused should work (skip) tls.connect > should process options correctly when connect is called with only options (skip) tls.connect > should process port and host correctly (skip) tls.connect > should process port, host, and callback correctly (skip) tls.connect > should handle the absence of a callback gracefully (skip) tls.c ... (truncated) ``` </details> <details><summary>passes on PR (with fix)</summary> ```console ASAN with fix: 18 skipped $ BUN_DEBUG_QUIET_LOGS=1 bun scripts/build.ts --profile=debug --quiet test "--reporter=junit" "--reporter-outfile=/tmp/pr_gate.xml" test/js/node/tls/node-tls-connect.test.ts bun test v1.4.3 (4ff9193) test/js/node/tls/node-tls-connect.test.ts: (pass) should have checkServerIdentity [3.28ms] (pass) should thow ECONNRESET if FIN is received before handshake [318.81ms] (pass) initializes authorizationError to null in the TLSSocket constructor [8.05ms] (pass) setMaxSendFragment mirrors OpenSSL's [512, 16384] acceptance without throwing [104.40ms] (pass) should be able to grab the JSStreamSocket constructor [13.33ms] (skip) tls.connect > should work with alpnProtocols (pass) tls.connect > Bun.serve() should work with tls and Bun.file() [79.45ms] (pass) tls.connect > should have peer certificate when using self asign certificate [88.70ms] (skip) tls.connect > should have peer certificate (skip) tls.connect > getCipher, getProtocol, getEphemeralKeyInfo, getSharedSigalgs, getSession, exportKeyingMaterial and isSessionReused should work (skip) tls.connect > should process options correctly when connect is called with only options (skip) tls.connect > should process port an ... (truncated) release with fix: 18 skipped $ bun scripts/build.ts --profile=release [configured] bun-profile → bun (stripped) in 612ms (unchanged) ninja: Entering directory `/workspace/bun/build/release' [1/22] gen generated_host_exports.rs generated_host_exports.rs: 122 exports (host=5, lazy=10, generic=107, rust=0); 243 extern-C blocks audited [2/22] gen JS modules (bundle-modules) Preprocess modules (7686ms) Bundle modules (44ms) Postprocesss modules (18ms) Bundle Functions (516ms) Generate Code (28ms) [8.30s] Bundled "src/js" for production 2599 kb 197 internal modules 13 native modules 50 internal functions across 16 files [2/6] cargo bun_runtime → libbun_runtime.a �[1m�[92m Compiling�[0m bun_runtime v0.0.0 (/workspace/bun/src/runtime) �[1m�[92m Finished�[0m `release` profile [optimized + debuginfo] target(s) in 4m 38s [3/6] link bun-profile [5/6] strip bun [5/6] bun-profile --revision 1.4.3-canary.1+75fa7a27d [build] done bun test v1.4.3-canary.1 (75fa7a2) test/js/node/tls/node-tls-connect.test.ts: (pass) should have checkServerIdentity [0.03ms] (pass) should thow ECONNRESET if FIN is received before handshake [6.16ms] (pass) initializes authorizationError to null in the TLSSocket ... (truncated) ``` </details> <details><summary>diff hotspot</summary> ``` src/runtime/socket/UpgradedDuplex.rs | 23 ++- test/js/node/tls/node-tls-connect.test.ts | 129 +++++++++++-- .../tls/tls-shutdown-before-handshake-fixture.mjs | 202 ++++++++++++++++++++- 3 files changed, 335 insertions(+), 19 deletions(-) ``` </details> **gate history** · 1 passed · 0 rejected · iteration 1 <details><summary>evidence per changed file</summary> ``` file reads edits tests src/runtime/socket/UpgradedDuplex.rs 2 8 20 test/js/node/tls/node-tls-connect.test.ts 3 5 18 …t/js/node/tls/tls-shutdown-before-handshake-fixture.mjs 3 3 23 ``` </details>  --------- Co-authored-by: Ciro Spaciari MacBook <ciro@anthropic.com>

Jarred-Sumner · 2026-10-06T06:20:13Z

Superseded by #44618, which consolidates the open TLS pull requests. This fix and its tests are in there, either as written, rewritten smaller, or merged with the other PRs that patched the same cause (see the "By area" list in that PR). Closing in favor of it.

…Socket that wraps a socket (#42340, #42343, #42339, #42453) Node's whole rule is `connecting = socket.connecting || !socket._handle`, and the wrapped socket's 'connect' clears it and is re-emitted. _write, _final, _read, ref and unref all wait on that pair, in Bun too. Bun broke it both ways. A wrap of a connected socket on the stream-level engine said connecting with no 'connect' to come, so end() never finished. A wrap of a connecting socket never emitted 'connect', so a second resume path grew (open -> drain) and TLSSocket._final called back at once with no handle: 'finish' with no FIN, and the connection stayed open. The rule is now an assignment in linkUpgraded() and 'connect' is emitted after the engine is attached, so the drain in SocketHandlers2.open and the early return in TLSSocket._final are gone. endNT picks the handle on the tick that sends the FIN: a server-side wrap attaches its handle on the tick its constructor queued, and a wrap made around a socket's own end() left the fd to the raw half. An engine that fails before it opens has no connect pending, so connectError reports it itself.

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This was referenced Sep 11, 2026

tls: end the wrapped Duplex on end(), also before the handshake completes #42350

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node:tls: send the FIN when end() runs before the TLS handle is attached #42339

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robobun mentioned this pull request Sep 24, 2026

node:tls: complete write(cb) and end(cb) over a Duplex when the stream completes the ciphertext #43877

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Jarred-Sumner mentioned this pull request Oct 6, 2026

tls: consolidate the open TLS fixes (both engines, node:tls, node:https, WebSocket, SQL) #44618

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node:tls: clear connecting on a TLSSocket that wraps a connected socket - #42343

node:tls: clear connecting on a TLSSocket that wraps a connected socket#42343
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