Finding deadlocks in CuTe kernels with SPIN
The article discusses the use of the SPIN model checker to identify or prove the absence of deadlocks in CuTe DSL kernels on NVIDIA B200. It highlights the challenges of debugging synchronization bugs in GPU kernels, particularly when barriers deadlock without providing useful error information. The author proposes a method to encode the synchronization model in Promela DSL to improve debugging efficiency and reliability.
- ▪SPIN model checker is utilized to find or prove the absence of deadlocks in CuTe DSL kernels.
- ▪Debugging synchronization bugs in GPU kernels is challenging due to the lack of error codes when deadlocks occur.
- ▪The proposed method aims to shorten the iteration cycle and provide deterministic results regarding deadlocks.
Hacker News (Newest) files mainly under programming. We currently carry 5,306 of its stories.
Story provenance
Source · retrieval · rights · ranking — open for full record
inspect →
Story provenance
Attribution is not the same as permission. This drawer separates discovery metadata, excerpts, WeSearch-generated summaries, reuse status, and whether the publisher receives the visit. Nothing here claims a legal grant the publisher has not made.
Record
| Original publisher | George's Blog |
| Canonical URL | https://metaworld.me/blog/public/Statically-finding-races-in-CUTE-kernels-or-Proving-absences-of-Deadlocks |
| Publication time | Wed, 27 May 2026 03:12:25 +0000 |
| Retrieval time | 2026-05-27T03:37:56.302Z |
| Last seen | 2026-05-27T03:37:56.302Z |
| Headline source | Publisher (no WeSearch rewrite) |
| Excerpt source | publisher body |
| Excerpt method | First ~120 words (~800 chars) of extracted publisher body, fair-use limited. |
| Summary | WeSearch · cerebras-chat (WeSearch summarizer) |
| Summary source text | contentText |
| Citation coverage | Summary is a WeSearch-generated derivative; primary citation is the original publisher URL. |
| Cluster | QHCUzb8eOaLJ |
| Cluster logic | Grouped by semantic title/content similarity across sources within a rolling window. Same-publisher template collisions are excluded from coverage comparison. |
| Ranking reason | Story pages are not engagement-ranked. Hub feeds use recency, with optional source-diversified chronological ordering (cap consecutive stories per source). No personalized ranking. |
| Publisher visit | Yes — open original |
| Substitutes article? | No — link-out required for full text |
Rights status (four layers)
WeSearch handling by dimension
| Indexing | May the item be indexed (stored, ranked, made findable)? | Allowed |
| Snippet | May a short excerpt of the publisher's text be shown? | Allowed |
| AI summary | May WeSearch generate its own short summary of the article? | Limited |
| Retrieval / RAG | May the content be exposed for third-party retrieval-augmented generation? | Not asserted |
| Model training | May the content be used to train AI models? | Not asserted |
| Commercial reuse | May the content be reused commercially? | Not permitted |
Basis: Derived from the published RSS/Atom feed. Contact: [email protected]. Reviewed: 2026-07-24.
Opening excerpt (first ~120 words) tap to expand
Using SPIN model checker to statically find or prove the absence of deadlocks in CuTe DSL kernels on NVIDIA B200, and presenting a proof-of-concept github.com/cheshire/cute2promela lowering from CuTe to SPIN. Synchronization bugs in GPU kernels are hard to debug. When a barrier deadlocks, the hardware yields no stack trace, and no error code until the benchmark times out. Hence each iteration of the debug loop starts to potentially cost tens of minutes. As we’ve worked on FlashInfer MLSYS Challenge (our solution took 1st place in the mixture-of-experts track), we had to iterate on a persistent fused mixture-of-experts kernel for DeepSeek-V3, written in CUTLASS’s CuTe DSL for an NVIDIA B200 and stitched together from FF1, SwiGLU, and FF2 stages across clusters of CTAs.
…
Excerpt limited to ~120 words for fair-use compliance. The full article is at George's Blog.
Discussion
0 commentsMore from George's Blog
