René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"quic: crash when incoming unidirectional stream has no onstream handler","articleBody":"When a QUIC server accepts a session without `.onstream`, and the client connects with a unidirectional stream with a body, Node crashes with `SIGSEGV`\n\nIf I use a bidirectional stream instead, it works. If I create the unidirectional stream without a body, it also does not crash.\n\nExpected behaviour would be to safely destroy or at least not crash.\n\nRepro: \n\n```js\n\nimport {readFileSync} from 'node:fs';\nimport {createPrivateKey} from 'node:crypto';\nimport {listen, connect} from 'node:quic';\n\nconst key = createPrivateKey(readFileSync(new URL('./key.pem', import.meta.url)));\nconst cert = readFileSync(new URL('./cert.pem', import.meta.url));\n\nconst serverEndpoint = await listen(async (session) =\u003e {\n  await session.opened;\n  console.log('Server session opened');\n\n  // Intentionally do not install .onstream\n}, {\n  sni: {'*': {keys: [key], certs: [cert]}},\n  alpn: ['repro'],\n});\n\nconst clientSession = await connect(serverEndpoint.address, {\n  servername: 'localhost',\n  alpn: 'repro',\n  ca: cert,\n});\n\nawait clientSession.opened;\nconsole.log('Client session opened');\n\nawait clientSession.createUnidirectionalStream({\n  body: 'something something darkside'\n});\n\nconsole.log('Unidirectional stream created');\n\n```\n\nOutputs\n```\n(node:99156) ExperimentalWarning: quic is an experimental feature and might change at any time\n(Use `node --trace-warnings ...` to show where the warning was created)\nClient session opened\nUnidirectional stream created\nServer session opened\n(node:99156) Warning: A new stream was received but no onstream callback was provided\n(node:99156) Warning: A new stream was received but no onstream callback was provided\n(node:99156) Warning: A new stream was received but no onstream callback was provided\nfish: Job 1, './out/Release/node --experiment…' terminated by signal SIGSEGV (Address boundary error)\n```","author":{"url":"https://github.com/efekrskl","@type":"Person","name":"efekrskl"},"datePublished":"2026-06-20T15:29:18.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":7},"url":"https://github.com/64030/node/issues/64030"}