Noah Kennedy

Tokio & Hyper maintainer, working at Cloudflare to help make the Internet a better place.

[Noah Kennedy @despisecomputer]

So there I was, a wall of unsafe FFI on one side, with a panic unwinding the stack towards me from another...

[Dane Knecht 🦭 @dok2001]

One of the perks of working @Cloudflare is getting access to the internal blog

[Matthew Prince 🌥 @eastdakota]

New record #DDoS attack: 5.8 Tbps peak. @Cloudflare systems automatically mitigated without any human intervention or anything slowing down. If you’re not using us for DDoS mitigation, call your current provider and ask what will happen when this beast comes for them.

[Noah Kennedy @despisecomputer]

@ag_dubs @IamStan that can be arranged

[\newcommand{\femb0t}{ @__femb0t]

Yeah I’ll go ahead and integrate this into my belief system

[ashley williams @ag_dubs]

tale as old as time

[Noah Kennedy @despisecomputer]

For context, I'm revisiting the use of io_uring for multi-threaded work-stealing asynchronous systems.

[Noah Kennedy @despisecomputer]

@axboe What's the specified behavior for io_uring when two threads try and invoke io_uring_enter simultaneously, with one trying to submit events only and the other waiting for completions only?

I couldn't find this documented anywhere.

[Noah Kennedy @despisecomputer]

@mitsuhiko @m_ou_se @djco I'm with @mitsuhiko here - this is such a monumentally painful thing to setup in a manner that it actually works and isn't incredibly brittle and dangerous to have in the codebase that I would treat this as a non-possibility.

I've actually tried this a few times and NO

[Noah Kennedy @despisecomputer]

@m_ou_se @djco @mitsuhiko I've definitely seen a few cases where this ends up being a vuln, but it's incredibly rare.

[Noah Kennedy @despisecomputer]

@m_ou_se @djco @mitsuhiko Also, for any bug where external input can cause a panic, this quickly becomes a severe DOS vulnerability.

[Noah Kennedy @despisecomputer]

@m_ou_se @djco @mitsuhiko At Cloudflare this is not generally the case - we would rather have other requests be handled to completion as normal than gracelessly kill the process, especially with stuff like QUIC where you might not be able to send reset packets (I am ignoring stateless resets)

[Noah Kennedy @despisecomputer]

@LunaFoxgirlVT you mean how one can launch 90kg projectiles over 300 meters?

[Noah Kennedy @despisecomputer]

@mycoliza how many people were out drinking when this line was uttered?

[Ignat Korchagin @ignatkn]

Decided to join the hype: Bentley vs #Linux

[Noah Kennedy @despisecomputer]

@mycoliza i need to rethink things

[Noah Kennedy @despisecomputer]

I drank 4 cans of red bull before coming to the airport this morning so that I could grow wings in the event of an airborne emergency or missed flight.

[Noah Kennedy @despisecomputer]

@mycoliza i got to 10 before i stopped

[Noah Kennedy @despisecomputer]

@PiquantParvenu so sorry to hear, i've been in this situation as well a number of times.

it's crazy though how significant the transition to "full useless" mode is

[Noah Kennedy @despisecomputer]

@mycoliza which may have been my bigger issue tbh

[Noah Kennedy @despisecomputer]

@mycoliza also i bought more energy drinks on the way out of the airport after landing

[Noah Kennedy @despisecomputer]

@mycoliza i still regret this decision