firecracker-microvm/firecracker · error
The channel's sending half was disconnected. Cannot receive
Error message
The channel's sending half was disconnected. Cannot receive data.
What it means
Error "The channel's sending half was disconnected. Cannot receive data." thrown in firecracker-microvm/firecracker.
Source
Thrown at src/firecracker/src/api_server_adapter.rs:137
}
}
impl MutEventSubscriber for ApiServerAdapter {
/// Handle a read event (EPOLLIN).
fn process(&mut self, event: Events, _: &mut EventOps) {
let source = event.fd();
let event_set = event.event_set();
if source == self.api_event_fd.as_raw_fd() && event_set == EventSet::IN {
let _ = self.api_event_fd.read();
match self.from_api.try_recv() {
Ok(api_request) => {
self.request = Some(api_request);
}
Err(TryRecvError::Empty) => {
warn_unrestricted!("Got a spurious notification from api thread");
}
Err(TryRecvError::Disconnected) => {
panic!("The channel's sending half was disconnected. Cannot receive data.");
}
};
} else {
error_unrestricted!("Spurious EventManager event for handler: ApiServerAdapter");
}
}
fn init(&mut self, ops: &mut EventOps) {
if let Err(err) = ops.add(Events::new(&self.api_event_fd, EventSet::IN)) {
error_unrestricted!("Failed to register activate event: {}", err);
}
}
}
#[allow(clippy::too_many_arguments)]
pub(crate) fn run_with_api(
seccomp_filters: &mut BpfThreadMap,
config_json: Option<String>,View on GitHub (pinned to 0a745def42)
Solutions
- Keep the owner of the channel's sending half alive for the lifetime of the receiver; do not drop the sender before API server shutdown.
- Treat the disconnection as a shutdown signal and exit the receive loop cleanly instead of propagating an error.
When it happens
Trigger: Thrown at src/firecracker/src/api_server_adapter.rs:137 when the library encounters an invalid state.
Common situations: See trigger scenarios.
AI-assisted analysis of firecracker-microvm/firecracker@0a745def42 (2026-08-19).
Data as JSON: /api/errors/749279e2e9cb7dc7.
Report an issue: GitHub.