On: What Is Io_uring?

[watt]

io_uring also caused a ton of problems for our containers in Kubernetes when Node 20 had enabled it by default. They scrambled and turned it off by default in https://github.com/nodejs/node/commit/686da19abb

[clhodapp → watt]

That sounds like a dubious integration contract for initialization between libuv and node, not an issue with io_uring.

I would assume the same thing would happen if they used traditional Posix APIs to open file handles before dropping their privileges.

[sapiogram → watt]

I'm extremely curious, what kinds of problems? We had entire Kubernetes nodes becoming unresponsive, and I think io_uring in Node 18.18.0 was responsible, but they had lots of stuff running on them so I was never able to pinpoint the exact cause.

[watt → sapiogram]

We hit memory leaks. Containers keeling over getting OOM killed.

[sapiogram → watt]

Ah okay, not the same symptoms as we had, then.