I made a zero-copy coroutine tracer to find my sch

Someone built a zero-copy coroutine tracer and honestly, it's the kind of tool that makes you wonder how you ever debugged async code without it. lixiasky-back—flying solo here—created coroTracer, an out-of-process observability framework for M:N coroutine schedulers that tracks down logical deadlocks, broken state machines, and coroutine leaks. It uses lock-free ring buffers and the cTP shared-memory protocol for ultra-low overhead state tracing. The post hit Hacker News with 49 points and drew real technical feedback from people who actually understand concurrent programming at a deep level. One commenter (gpderetta) flagged a potential missed wakeup issue in the signaling code, noting it needs a #StoreLoad fence between the slot .seq store and the sleeping flag load. lixiasky acknowledged the catch and said it's still a very early prototype—they're just trying to see if the architecture holds water. The mods apparently "un-killed" the post after it was initially removed, which means people care about this. It's cross-language, it's open source, and it's the kind of low-level infrastructure tool that other developer tools get built on top of. If you're dealing with coroutine schedulers and losing wakeups in production, this is probably worth a look.