From 0e8a5d70494b7e0a9e93534d03deb5a49814af6e Mon Sep 17 00:00:00 2001 From: Teng Lin Date: Wed, 25 Feb 2026 16:44:47 -0500 Subject: [PATCH 1/4] fix: prevent Gemini second-turn hangs in ACP adapter MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Two bugs caused the "same session supports a second turn" E2E test to fail intermittently: 1. waitForResponse data loss — when Gemini sent session/request_permission in the same stdout chunk as the session/new response, the remaining lines after the matched response ID were silently dropped. The adapter never processed the permission request, Gemini blocked waiting for a response, and session/prompt was never processed. Fix: return { result, leftover } from waitForResponse, pass leftover from both handshake steps as initialBuffer / preBufferedData so AcpSession replays them on startup. 2. No process-exit detection + no process-group kill — createMessageStream only listened on child.stdout "close", which never fires when grandchild processes inherit the stdout pipe. If Gemini spawned subprocesses that kept the pipe open, backendConnected stayed true indefinitely. Fix: add child.on("exit", onChildExit) → finalize() alongside onClose so the stream ends as soon as the main Gemini process exits regardless of grandchildren. Also switch close() and the catch block in connect() to process.kill(-pid, signal) with child.kill() fallback, matching the pattern from NodeProcessManager (commit 70ad1ca). The spawn call already had detached: true (added in prior session). --- src/adapters/acp/acp-adapter.ts | 114 ++++++++++++++++++++++++-------- src/adapters/acp/acp-session.ts | 39 +++++++++-- 2 files changed, 120 insertions(+), 33 deletions(-) diff --git a/src/adapters/acp/acp-adapter.ts b/src/adapters/acp/acp-adapter.ts index f2de0ae..5f3ae28 100644 --- a/src/adapters/acp/acp-adapter.ts +++ b/src/adapters/acp/acp-adapter.ts @@ -56,6 +56,11 @@ export class AcpAdapter implements BackendAdapter { const child = this.spawnFn(command, args, { stdio: ["pipe", "pipe", "pipe"], cwd, + // Create a new process group so we can kill all descendant processes + // (e.g. subprocesses spawned by the ACP agent that inherit the stdout + // pipe, which would otherwise keep the pipe alive after the main + // process exits and prevent backend-disconnected detection). + detached: true, }); if (!child.stdin || !child.stdout) { @@ -79,14 +84,15 @@ export class AcpAdapter implements BackendAdapter { }); child.stdin.write(codec.encode(initReq)); - const initResult = await waitForResponse( - child.stdout, - codec, - initId, - tracer, - options.sessionId, - initializeTimeoutMs, - ); + const { result: initResult, leftover: initLeftover } = + await waitForResponse( + child.stdout, + codec, + initId, + tracer, + options.sessionId, + initializeTimeoutMs, + ); // Create or resume session const sessionMethod = options.resume ? "session/load" : "session/new"; @@ -102,22 +108,43 @@ export class AcpAdapter implements BackendAdapter { }); child.stdin.write(codec.encode(sessionReq)); - const sessionResult = await waitForResponse<{ sessionId: string }>( + const { result: sessionResult, leftover: sessionLeftover } = await waitForResponse<{ + sessionId: string; + }>( child.stdout, codec, sessionReqId, tracer, options.sessionId, initializeTimeoutMs, + initLeftover, ); const sessionId = sessionResult.sessionId ?? options.sessionId; - return new AcpSession(sessionId, child, codec, initResult, tracer, this.errorClassifier); + return new AcpSession( + sessionId, + child, + codec, + initResult, + tracer, + this.errorClassifier, + sessionLeftover, + ); } catch (err) { - // Kill the child process to prevent zombies when handshake fails or times out - child.kill("SIGTERM"); - const killTimer = setTimeout(() => child.kill("SIGKILL"), killGracePeriodMs); + // Kill the entire process group to prevent zombies when handshake fails or times out. + // Falls back to child.kill() if the pid is unavailable or the signal call fails. + const pid = child.pid; + const killGroup = (signal: NodeJS.Signals) => { + try { + if (pid !== undefined) process.kill(-pid, signal); + else child.kill(signal); + } catch { + child.kill(signal); + } + }; + killGroup("SIGTERM"); + const killTimer = setTimeout(() => killGroup("SIGKILL"), killGracePeriodMs); child.once("exit", () => clearTimeout(killTimer)); killTimer.unref(); throw err; @@ -125,7 +152,17 @@ export class AcpAdapter implements BackendAdapter { } } -/** Read lines from stdout until we get a JSON-RPC response matching the given ID. */ +/** + * Read lines from stdout until we get a JSON-RPC response matching the given ID. + * + * Returns the decoded result and any raw data that arrived after the matched + * response in the same read chunk (leftover), so the caller can replay it + * rather than silently losing messages (e.g. a session/request_permission that + * Gemini sends in the same chunk as the session/new response). + * + * @param initialBuffer - Optional pre-existing data to process before listening + * for new chunks (used to pass leftover from a prior waitForResponse call). + */ async function waitForResponse( stdout: NodeJS.ReadableStream, codec: JsonRpcCodec, @@ -133,19 +170,27 @@ async function waitForResponse( tracer?: MessageTracer, sessionId?: string, timeoutMs?: number, -): Promise { - return new Promise((resolve, reject) => { - let buffer = ""; + initialBuffer?: string, +): Promise<{ result: T; leftover: string }> { + return new Promise<{ result: T; leftover: string }>((resolve, reject) => { + let buffer = initialBuffer ?? ""; + let settled = false; let timer: ReturnType | undefined; - const onData = (chunk: Buffer) => { - buffer += chunk.toString("utf-8"); + const settle = (fn: () => void) => { + if (settled) return; + settled = true; + cleanup(); + fn(); + }; + const processBuffer = () => { const lines = buffer.split("\n"); // Keep the last incomplete line in the buffer buffer = lines.pop() ?? ""; - for (const line of lines) { + for (let i = 0; i < lines.length; i++) { + const line = lines[i]; if (!line.trim()) continue; try { @@ -155,11 +200,14 @@ async function waitForResponse( phase: "handshake_recv", }); if ("id" in msg && msg.id === expectedId) { - cleanup(); + // Collect remaining lines + incomplete buffer as leftover for the next stage + const remaining = lines.slice(i + 1); + const leftover = remaining.length > 0 ? `${remaining.join("\n")}\n${buffer}` : buffer; if ("error" in msg && msg.error) { - reject(new Error(`ACP error: ${msg.error.message}`)); + const errorMsg = msg.error.message; + settle(() => reject(new Error(`ACP error: ${errorMsg}`))); } else { - resolve((msg as { result: T }).result); + settle(() => resolve({ result: (msg as { result: T }).result, leftover })); } return; } @@ -169,14 +217,17 @@ async function waitForResponse( } }; + const onData = (chunk: Buffer) => { + buffer += chunk.toString("utf-8"); + processBuffer(); + }; + const onError = (err: Error) => { - cleanup(); - reject(err); + settle(() => reject(err)); }; const onClose = () => { - cleanup(); - reject(new Error("ACP subprocess closed before responding")); + settle(() => reject(new Error("ACP subprocess closed before responding"))); }; const cleanup = () => { @@ -188,11 +239,16 @@ async function waitForResponse( if (timeoutMs !== undefined) { timer = setTimeout(() => { - cleanup(); - reject(new Error(`ACP handshake timed out after ${timeoutMs}ms`)); + settle(() => reject(new Error(`ACP handshake timed out after ${timeoutMs}ms`))); }, timeoutMs); } + // Process any pre-existing buffer content before listening for more data + if (buffer) { + processBuffer(); + if (settled) return; + } + stdout.on("data", onData); stdout.on("error", onError); stdout.on("close", onClose); diff --git a/src/adapters/acp/acp-session.ts b/src/adapters/acp/acp-session.ts index 130294c..86720d9 100644 --- a/src/adapters/acp/acp-session.ts +++ b/src/adapters/acp/acp-session.ts @@ -44,6 +44,7 @@ export class AcpSession implements BackendSession { private readonly pendingRequests = new Map(); private pendingPermissionRequestId: number | string | undefined; private closed = false; + private readonly preBufferedData: string; /** Accumulated streaming text for synthesizing an assistant message when the prompt completes. */ private streamedText = ""; /** Whether a status_change(running) has been emitted for the current turn. */ @@ -56,6 +57,7 @@ export class AcpSession implements BackendSession { initResult: AcpInitializeResult, tracer?: MessageTracer, errorClassifier?: ErrorClassifier, + preBufferedData?: string, ) { this.sessionId = sessionId; this.child = child; @@ -63,6 +65,7 @@ export class AcpSession implements BackendSession { this.initResult = initResult; this.tracer = tracer; this.errorClassifier = errorClassifier; + this.preBufferedData = preBufferedData ?? ""; } send(message: UnifiedMessage): void { @@ -168,16 +171,28 @@ export class AcpSession implements BackendSession { } this.pendingRequests.clear(); - // Send SIGTERM and wait for exit with timeout + // Kill the entire process group so descendant processes (e.g. subprocesses + // spawned by the ACP agent that inherited the stdout pipe) are also terminated. + // Falls back to child.kill() if the pid is unavailable or the signal call fails. + const pid = this.child.pid; + const killGroup = (signal: NodeJS.Signals) => { + try { + if (pid !== undefined) process.kill(-pid, signal); + else this.child.kill(signal); + } catch { + this.child.kill(signal); + } + }; + const exitPromise = new Promise((resolve) => { this.child.once("exit", () => resolve()); }); - this.child.kill("SIGTERM"); + killGroup("SIGTERM"); const timeout = new Promise((resolve) => { setTimeout(() => { - this.child.kill("SIGKILL"); + killGroup("SIGKILL"); resolve(); }, 5000); }); @@ -190,6 +205,7 @@ export class AcpSession implements BackendSession { const codec = this.codec; const initResult = this.initResult; const session = this; + const preBufferedData = this.preBufferedData; return { [Symbol.asyncIterator]() { @@ -260,7 +276,7 @@ export class AcpSession implements BackendSession { } }; - const onClose = () => { + const finalize = () => { done = true; if (resolve) { const r = resolve; @@ -269,8 +285,22 @@ export class AcpSession implements BackendSession { } }; + const onClose = () => finalize(); + + // Drive finalize when the child process itself exits, even if grandchild + // processes keep the stdout pipe open (which would otherwise prevent onClose + // from firing and leave backendConnected=true indefinitely). + const onChildExit = () => finalize(); + child.stdout?.on("data", onData); child.stdout?.on("close", onClose); + child.on("exit", onChildExit); + + // Replay any data buffered during the ACP handshake so messages that + // arrived in the same chunk as the session/new response are not lost. + if (preBufferedData) { + onData(Buffer.from(preBufferedData, "utf-8")); + } return { next(): Promise> { @@ -298,6 +328,7 @@ export class AcpSession implements BackendSession { return(): Promise> { child.stdout?.removeListener("data", onData); child.stdout?.removeListener("close", onClose); + child.removeListener("exit", onChildExit); done = true; return Promise.resolve({ value: undefined, From e9b6996d3143308b5751981b9e2f39386203c4b5 Mon Sep 17 00:00:00 2001 From: Teng Lin Date: Wed, 25 Feb 2026 18:22:54 -0500 Subject: [PATCH 2/4] refactor: extract killProcessGroup helper and simplify finalize listeners --- src/adapters/acp/acp-adapter.ts | 16 ++----- src/adapters/acp/acp-session.ts | 36 ++++---------- src/adapters/acp/kill-process-group.ts | 18 +++++++ trace.ndjson | 66 ++++++++++++++++++++++++++ 4 files changed, 97 insertions(+), 39 deletions(-) create mode 100644 src/adapters/acp/kill-process-group.ts create mode 100644 trace.ndjson diff --git a/src/adapters/acp/acp-adapter.ts b/src/adapters/acp/acp-adapter.ts index 5f3ae28..bc0cb0f 100644 --- a/src/adapters/acp/acp-adapter.ts +++ b/src/adapters/acp/acp-adapter.ts @@ -19,6 +19,7 @@ import type { import type { MessageTracer } from "../../core/messaging/message-tracer.js"; import { AcpSession } from "./acp-session.js"; import { JsonRpcCodec } from "./json-rpc.js"; +import { killProcessGroup } from "./kill-process-group.js"; import type { AcpInitializeResult, ErrorClassifier } from "./outbound-translator.js"; const PROTOCOL_VERSION = 1; @@ -132,19 +133,8 @@ export class AcpAdapter implements BackendAdapter { sessionLeftover, ); } catch (err) { - // Kill the entire process group to prevent zombies when handshake fails or times out. - // Falls back to child.kill() if the pid is unavailable or the signal call fails. - const pid = child.pid; - const killGroup = (signal: NodeJS.Signals) => { - try { - if (pid !== undefined) process.kill(-pid, signal); - else child.kill(signal); - } catch { - child.kill(signal); - } - }; - killGroup("SIGTERM"); - const killTimer = setTimeout(() => killGroup("SIGKILL"), killGracePeriodMs); + killProcessGroup(child, "SIGTERM"); + const killTimer = setTimeout(() => killProcessGroup(child, "SIGKILL"), killGracePeriodMs); child.once("exit", () => clearTimeout(killTimer)); killTimer.unref(); throw err; diff --git a/src/adapters/acp/acp-session.ts b/src/adapters/acp/acp-session.ts index 86720d9..3f1c2a6 100644 --- a/src/adapters/acp/acp-session.ts +++ b/src/adapters/acp/acp-session.ts @@ -18,6 +18,7 @@ import { isJsonRpcResponse, type JsonRpcCodec, } from "./json-rpc.js"; +import { killProcessGroup } from "./kill-process-group.js"; import type { AcpInitializeResult, ErrorClassifier } from "./outbound-translator.js"; import { translateAuthStatus, @@ -171,28 +172,15 @@ export class AcpSession implements BackendSession { } this.pendingRequests.clear(); - // Kill the entire process group so descendant processes (e.g. subprocesses - // spawned by the ACP agent that inherited the stdout pipe) are also terminated. - // Falls back to child.kill() if the pid is unavailable or the signal call fails. - const pid = this.child.pid; - const killGroup = (signal: NodeJS.Signals) => { - try { - if (pid !== undefined) process.kill(-pid, signal); - else this.child.kill(signal); - } catch { - this.child.kill(signal); - } - }; - const exitPromise = new Promise((resolve) => { this.child.once("exit", () => resolve()); }); - killGroup("SIGTERM"); + killProcessGroup(this.child, "SIGTERM"); const timeout = new Promise((resolve) => { setTimeout(() => { - killGroup("SIGKILL"); + killProcessGroup(this.child, "SIGKILL"); resolve(); }, 5000); }); @@ -276,6 +264,9 @@ export class AcpSession implements BackendSession { } }; + // Finalize the stream when the child process exits or stdout closes. + // Listening on both ensures we detect disconnection even if grandchild + // processes keep the stdout pipe open after the main process exits. const finalize = () => { done = true; if (resolve) { @@ -285,16 +276,9 @@ export class AcpSession implements BackendSession { } }; - const onClose = () => finalize(); - - // Drive finalize when the child process itself exits, even if grandchild - // processes keep the stdout pipe open (which would otherwise prevent onClose - // from firing and leave backendConnected=true indefinitely). - const onChildExit = () => finalize(); - child.stdout?.on("data", onData); - child.stdout?.on("close", onClose); - child.on("exit", onChildExit); + child.stdout?.on("close", finalize); + child.on("exit", finalize); // Replay any data buffered during the ACP handshake so messages that // arrived in the same chunk as the session/new response are not lost. @@ -327,8 +311,8 @@ export class AcpSession implements BackendSession { }, return(): Promise> { child.stdout?.removeListener("data", onData); - child.stdout?.removeListener("close", onClose); - child.removeListener("exit", onChildExit); + child.stdout?.removeListener("close", finalize); + child.removeListener("exit", finalize); done = true; return Promise.resolve({ value: undefined, diff --git a/src/adapters/acp/kill-process-group.ts b/src/adapters/acp/kill-process-group.ts new file mode 100644 index 0000000..3cd6425 --- /dev/null +++ b/src/adapters/acp/kill-process-group.ts @@ -0,0 +1,18 @@ +import type { ChildProcess } from "node:child_process"; + +/** + * Send a signal to the entire process group (negative PID) so descendant + * processes spawned by the ACP agent are also terminated. + * + * Falls back to `child.kill(signal)` when the PID is unavailable (not yet + * spawned) or when `process.kill` throws (e.g. process already exited). + */ +export function killProcessGroup(child: ChildProcess, signal: NodeJS.Signals): void { + const pid = child.pid; + try { + if (pid !== undefined) process.kill(-pid, signal); + else child.kill(signal); + } catch { + child.kill(signal); + } +} diff --git a/trace.ndjson b/trace.ndjson new file mode 100644 index 0000000..ada4ca8 --- /dev/null +++ b/trace.ndjson @@ -0,0 +1,66 @@ +{"trace":true,"traceId":"t_79beddb9","layer":"backend","direction":"send","messageType":"native_outbound","ts":"2026-02-25T18:18:40.644Z","elapsed_ms":0,"sessionId":"3f4b0dcb-7d14-4397-9364-f37750f271c0","seq":1,"phase":"handshake_send","size_bytes":161,"body":{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":1,"clientCapabilities":{},"clientInfo":{"name":"beamcode","version":"0.1.0"}}}} +{"trace":true,"traceId":"t_aaf2b7ba","layer":"backend","direction":"recv","messageType":"native_inbound","ts":"2026-02-25T18:18:45.668Z","elapsed_ms":0,"sessionId":"3f4b0dcb-7d14-4397-9364-f37750f271c0","seq":2,"phase":"handshake_recv","size_bytes":513,"body":{"jsonrpc":"2.0","id":1,"result":{"protocolVersion":1,"authMethods":[{"id":"oauth-personal","name":"Log in with Google","description":null},{"id":"gemini-api-key","name":"Use Gemini API key","description":"Requires setting the `GEMINI_API_KEY` environment 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+{"trace":true,"traceId":"t_2736e8a4","layer":"bridge","direction":"send","messageType":"presence_update","ts":"2026-02-25T18:18:52.244Z","elapsed_ms":0,"sessionId":"3f4b0dcb-7d14-4397-9364-f37750f271c0","seq":40,"size_bytes":40,"body":{"type":"presence_update","consumers":[]}} +{"trace":true,"traceId":"t_d59b2d8e","layer":"bridge","direction":"send","messageType":"cli_disconnected","ts":"2026-02-25T18:18:52.302Z","elapsed_ms":0,"sessionId":"3f4b0dcb-7d14-4397-9364-f37750f271c0","seq":41,"phase":"t4_to_consumer","size_bytes":26,"body":{"type":"cli_disconnected"}} +{"trace":true,"traceId":"t_8b715878","layer":"bridge","direction":"send","messageType":"cli_disconnected","ts":"2026-02-25T18:18:52.303Z","elapsed_ms":0,"sessionId":"3f4b0dcb-7d14-4397-9364-f37750f271c0","seq":42,"size_bytes":26,"body":{"type":"cli_disconnected"}} From 667e3904fa1f6e0d3edf6961625e90541b2bd473 Mon Sep 17 00:00:00 2001 From: Teng Lin Date: Wed, 25 Feb 2026 18:38:34 -0500 Subject: [PATCH 3/4] fix: harden killProcessGroup fallback and close() timer cleanup - killProcessGroup: wrap the child.kill() fallback in its own try/catch so a race where the process exits between the two kill calls doesn't surface as an unhandled exception (matches the pattern in node-process-manager.ts) - AcpSession.close(): inline the exit/timeout logic into a single Promise so the SIGKILL timer is both unref'd (won't keep the event loop alive) and cleared via clearTimeout when the child exits normally, preventing a spurious 5s delay on clean shutdown --- src/adapters/acp/acp-session.ts | 18 ++++++++++-------- src/adapters/acp/kill-process-group.ts | 6 +++++- 2 files changed, 15 insertions(+), 9 deletions(-) diff --git a/src/adapters/acp/acp-session.ts b/src/adapters/acp/acp-session.ts index 3f1c2a6..67aeae6 100644 --- a/src/adapters/acp/acp-session.ts +++ b/src/adapters/acp/acp-session.ts @@ -172,20 +172,22 @@ export class AcpSession implements BackendSession { } this.pendingRequests.clear(); - const exitPromise = new Promise((resolve) => { - this.child.once("exit", () => resolve()); - }); + await new Promise((resolve) => { + let killTimer: ReturnType | undefined; - killProcessGroup(this.child, "SIGTERM"); + this.child.once("exit", () => { + clearTimeout(killTimer); + resolve(); + }); - const timeout = new Promise((resolve) => { - setTimeout(() => { + killProcessGroup(this.child, "SIGTERM"); + + killTimer = setTimeout(() => { killProcessGroup(this.child, "SIGKILL"); resolve(); }, 5000); + killTimer.unref(); }); - - await Promise.race([exitPromise, timeout]); } private createMessageStream(): AsyncIterable { diff --git a/src/adapters/acp/kill-process-group.ts b/src/adapters/acp/kill-process-group.ts index 3cd6425..4bef6e9 100644 --- a/src/adapters/acp/kill-process-group.ts +++ b/src/adapters/acp/kill-process-group.ts @@ -13,6 +13,10 @@ export function killProcessGroup(child: ChildProcess, signal: NodeJS.Signals): v if (pid !== undefined) process.kill(-pid, signal); else child.kill(signal); } catch { - child.kill(signal); + try { + child.kill(signal); + } catch { + // Process already exited — nothing to do. + } } } From 1db8ea24bd643e2ef4d8c8cc3b4f7a36d723b42d Mon Sep 17 00:00:00 2001 From: Teng Lin Date: Wed, 25 Feb 2026 19:01:53 -0500 Subject: [PATCH 4/4] fix review: simplify killProcessGroup logic and remove trace artifact --- src/adapters/acp/kill-process-group.ts | 18 ++++--- trace.ndjson | 66 -------------------------- 2 files changed, 12 insertions(+), 72 deletions(-) delete mode 100644 trace.ndjson diff --git a/src/adapters/acp/kill-process-group.ts b/src/adapters/acp/kill-process-group.ts index 4bef6e9..cae5685 100644 --- a/src/adapters/acp/kill-process-group.ts +++ b/src/adapters/acp/kill-process-group.ts @@ -9,14 +9,20 @@ import type { ChildProcess } from "node:child_process"; */ export function killProcessGroup(child: ChildProcess, signal: NodeJS.Signals): void { const pid = child.pid; - try { - if (pid !== undefined) process.kill(-pid, signal); - else child.kill(signal); - } catch { + if (pid !== undefined) { try { - child.kill(signal); + // Try to kill the whole process group first. + process.kill(-pid, signal); + return; // If successful, we're done. } catch { - // Process already exited — nothing to do. + // Fallback to killing just the child process if group kill fails + // (e.g. on Windows, or if the process has already exited). } } + + try { + child.kill(signal); + } catch { + // Process already exited — nothing to do. + } } diff --git a/trace.ndjson b/trace.ndjson deleted file mode 100644 index ada4ca8..0000000 --- a/trace.ndjson +++ /dev/null @@ -1,66 +0,0 @@ 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