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fix(core): 16 MiB worker stack so subagent delegation doesn't crash the JSON-RPC server #3155

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fix(core): 16 MiB worker stack so subagent delegation doesn't crash the JSON-RPC server #3155

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fix(core): give the JSON-RPC runtime a 16 MiB worker stack to survive…
sanil-23 Jun 1, 2026
63bf0f4
Merge remote-tracking branch 'upstream/main' into pr/3155
senamakel Jun 1, 2026
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9 changes: 9 additions & 0 deletions src/core/cli.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -278,8 +278,17 @@ fn run_server_command(args: &[String]) -> Result<()> {
crate::core::logging::init_for_cli_run(verbose, log_scope);

// Initialize the Tokio multi-threaded runtime.
//
// A single agent turn is a very large async state machine (system prompt +
// hundreds of tool specs + the nested provider/tool loop), and delegating
// to a sub-agent runs another full turn one level down. Even with the inner
// sub-agent future boxed (`subagent_runner::ops`), that nesting overflows
// tokio's default 2 MiB worker-thread stack and aborts the whole process
// (SIGABRT: "thread 'tokio-rt-worker' has overflowed its stack"), taking
// the JSON-RPC server down mid-request. Give workers a roomier stack.
let rt = tokio::runtime::Builder::new_multi_thread()
.enable_all()
.thread_stack_size(16 * 1024 * 1024)
.build()?;
rt.block_on(async {
crate::core::jsonrpc::run_server(host.as_deref(), port, socketio_enabled).await
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