`OTEL_DENO=true deno run --watch` does not respond to SIGINT or other signals and could stop the restarting loop

[lukas-santiago]

Previously, when Deno is in --watch mode, there was a problem with sigint signal handler (according to #30587) and that was solved. By this and my specific case I found an issue when OpenTelemetry mode is enabled. The Deno's signal handling stops working at all, no callbacks are reached. I tested just with SIGINT and SIGHUP likewise no one worked as expected. Thats the code to reproduce the issue:

// watch-error.ts
const ac = new AbortController();

Deno.addSignalListener("SIGINT", () => {
  console.log("SIGINT");
  setTimeout(() => ac.abort(), 1000);
});

Deno.addSignalListener("SIGHUP", () => {
  console.log("SIGHUP");
});

Deno.serve({ signal: ac.signal }, () => new Response("Hello World"));

And run with OTEL_DENO=true deno run -A --watch watch-error.ts.

I send the signals with btop tool and it works normal when the flag OTEL_DENO is missing. At first the CTRL+C in terminal don't working was the main issue but after a CTRL+C was unrecognized and I change some files the entire watching mode stucks trying to restarting the app then I need to send a SIGKILL to the process. One time at restarting with this issue it showed a blocking message and a timer implying that the "node_modules" or the process was locked but I'm not sure about the cause.

Version

deno 2.5.6 (stable, release, x86_64-unknown-linux-gnu)
v8 14.0.365.5-rusty
typescript 5.9.2

[bartlomieju]

Which Deno version are you using?

[lukas-santiago]

Which Deno version are you using?

deno 2.5.6 (stable, release, x86_64-unknown-linux-gnu)
v8 14.0.365.5-rusty
typescript 5.9.2

[bartlomieju]

Do you experience the same problem on latest canary? (deno upgrade canary) FWIW I can't reproduce it on latest canary.

[lukas-santiago]

Yes, the same problem. Do you need something of my deno.json?

[lukas-santiago]

JFYI, some parts of deno.json:

{
   "compilerOptions":{
      "experimentalDecorators":true,
      "emitDecoratorMetadata":true
   },
   "nodeModulesDir":"auto"
}