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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`worker_threads.moveMessagePortToContext` results in an abort","articleBody":"\u003c!--\r\nThank you for reporting an issue.\r\n\r\nThis issue tracker is for bugs and issues found within Node.js core.\r\nIf you require more general support please file an issue on our help\r\nrepo. https://github.com/nodejs/help\r\n\r\n\r\nPlease fill in as much of the template below as you're able.\r\n\r\nVersion: output of `node -v`\r\nPlatform: output of `uname -a` (UNIX), or output of `\"$([Environment]::OSVersion | ForEach-Object VersionString) $(if ([Environment]::Is64BitOperatingSystem) { \"x64\" } else { \"x86\" })\"` in PowerShell console (Windows)\r\nSubsystem: if known, please specify affected core module name\r\n-->\r\n\r\n* **Version**: v17.0.0-pre\r\n* **Platform**: Linux 5.8.0-38-generic #43~20.04.1-Ubuntu SMP Tue Jan 12 16:39:47 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux\r\n* **Subsystem**: worker_threads.moveMessagePortToContext\r\n\r\n### What steps will reproduce the bug?\r\nSetup a node instance,\r\n```\r\n» node\r\n```\r\nand run the following javascript code line by line.\r\n```\r\nworker_threads = require('worker_threads');msgChannel = new worker_threads.MessageChannel();\r\nmsgChannel.port2.close();\r\nworker_threads.moveMessagePortToContext(msgChannel.port2,{});\r\n```\r\nThen an abort occurs. \r\nNoticed that paste these codes to REPL all at once seems cannot trigger this abort. Run these codes line by line pls.\r\n\u003c!--\r\nEnter details about your bug, preferably a simple code snippet that can be\r\nrun using `node` directly without installing third-party dependencies.\r\n-->\r\n\r\n### How often does it reproduce? Is there a required condition?\r\nThis problem can always be triggered following the steps above.\r\n\r\n### What is the expected behavior?\r\nIf any error occurs, an exception or other similar error-reporting stuff should be thrown. There is no reason to abort the whole node process.\r\n\r\n\u003c!--\r\nIf possible please provide textual output instead of screenshots.\r\n-->\r\n\r\n### What do you see instead?\r\n```\r\n» node\r\nWelcome to Node.js v17.0.0-pre.\r\nType \".help\" for more information.\r\n> worker_threads = require('worker_threads');msgChannel = new worker_threads.MessageChannel();\r\nMessageChannel {\r\n  port1: MessagePort [EventTarget] {\r\n    active: true,\r\n    refed: false,\r\n    [Symbol(kEvents)]: SafeMap(2) [Map] {\r\n      'newListener' => [Object],\r\n      'removeListener' => [Object]\r\n    },\r\n    [Symbol(events.maxEventTargetListeners)]: 10,\r\n    [Symbol(events.maxEventTargetListenersWarned)]: false,\r\n    [Symbol(kNewListener)]: [Function (anonymous)],\r\n    [Symbol(kRemoveListener)]: [Function (anonymous)],\r\n    [Symbol(nodejs.internal.kCurrentlyReceivingPorts)]: undefined\r\n  },\r\n  port2: MessagePort [EventTarget] {\r\n    active: true,\r\n    refed: false,\r\n    [Symbol(kEvents)]: SafeMap(2) [Map] {\r\n      'newListener' => [Object],\r\n      'removeListener' => [Object]\r\n    },\r\n    [Symbol(events.maxEventTargetListeners)]: 10,\r\n    [Symbol(events.maxEventTargetListenersWarned)]: false,\r\n    [Symbol(kNewListener)]: [Function (anonymous)],\r\n    [Symbol(kRemoveListener)]: [Function (anonymous)],\r\n    [Symbol(nodejs.internal.kCurrentlyReceivingPorts)]: undefined\r\n  }\r\n}\r\n> msgChannel.port2.close();\r\nundefined\r\n> worker_threads.moveMessagePortToContext(msgChannel.port2,{});\r\n/home/zys/Toolchains/node/node[59534]: ../src/node_messaging.cc:1068:static void node::worker::MessagePort::MoveToContext(const FunctionCallbackInfo\u003cv8::Value> &): Assertion `(port) != nullptr' failed.\r\n 1: 0x3623e04 node::DumpBacktrace(_IO_FILE*) [/home/zys/Toolchains/node/node]\r\n 2: 0x37bb92e node::Abort() [/home/zys/Toolchains/node/node]\r\n 3: 0x37bb3f8  [/home/zys/Toolchains/node/node]\r\n 4: 0x38c8dac node::worker::MessagePort::MoveToContext(v8::FunctionCallbackInfo\u003cv8::Value> const&) [/home/zys/Toolchains/node/node]\r\n 5: 0x3ebd0d8 v8::internal::FunctionCallbackArguments::Call(v8::internal::CallHandlerInfo) [/home/zys/Toolchains/node/node]\r\n 6: 0x3ebadb9  [/home/zys/Toolchains/node/node]\r\n 7: 0x3eb8d1d  [/home/zys/Toolchains/node/node]\r\n 8: 0x5a08759  [/home/zys/Toolchains/node/node]\r\n[1]    59534 abort (core dumped)  /home/zys/Toolchains/node/node\r\n```\r\n\u003c!--\r\nIf possible please provide textual output instead of screenshots.\r\n-->\r\n\r\n### Additional information\r\n\r\n\u003c!--\r\nTell us anything else you think we should know.\r\n-->\r\n","author":{"url":"https://github.com/zyscoder","@type":"Person","name":"zyscoder"},"datePublished":"2021-05-01T16:18:50Z","url":"https://github.com/nodejs/node/issues/38499"}