Fix double-close of _serverFd in SocketServer teardown#585
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Do you think you can merge master in your branch, I think I fixed the build issue. with uwp, then we'll reckick the PR checks. |
SocketServer::stop() closed _serverFd but never cleared it, and stop()
runs again from both ~WebSocketServer() and ~SocketServer(), so every
teardown closed the same fd number two or three times. If another
thread opens a descriptor between those closes, the kernel reuses the
number and the stale close destroys it — observed as intermittent
process aborts ("Unexpected error 9 on netlink descriptor", glibc's
getaddrinfo netlink probe) when a DNS lookup raced a server teardown.
Close the fd once and set it to -1, in stop() and in the listen()
error paths.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Done! |
bsergean
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Jun 25, 2026
Release of accumulated fixes since v12.0.0: DNS lookup crash/offline resolution (#589), OpenSSL IP-address cert validation (#588), case-insensitive Upgrade header (#584), server fd double-close (#585), fragment buffering optimization (#562), and the install include-dir fix (#582). Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Hi, I'm using IXWebSocket in https://github.com/openglad/openglad, and ran into an issue when using this in a multithreaded setting.
It seems that
SocketServer::stop()closes_serverFdbut never clears it, and stop() runs again from both~WebSocketServer()and~SocketServer(), so every teardown closes the same fd number two or three times. If another thread opens a descriptor between those closes, the kernel reuses the number and the stale close destroys it. I was hitting intermittent process aborts ("Unexpected error 9 on netlink descriptor", glibc's getaddrinfo netlink probe) whenever a DNS lookup in another thread raced a server teardown.This PR sets
_serverFdto -1 after closing it (including in error paths), like what seems to happen to_sockfdcurrently elsewhere in the code. This seems to have fixed it for me.