A ripgrep crash investigation ends up finding a kernel TLB-shootdown race
BenBajarin · x · 2026-07-28
A ripgrep segfault investigation ends up exposing a kernel race
The linked GitHub repo documents an unusually deep debugging session around ripgrep #3494. What looked like a user-space crash turned out to be a kernel TLB-shootdown race that made a thread’s own write disappear a few instructions later.
- The analysis starts from a reproducible SIGSEGV seen in musl mallocng during large multi-threaded searches.
- Instrumentation showed the crash mechanism was not an ordinary allocator bug: the page backing a freshly faulted anonymous page was being replaced mid-function.
- The poster also jokes that tools and models helped investigate the bug instead of blocking on safety concerns.
This is both a neat systems debugging story and a good example of AI-assisted low-level investigation.
Related event: Developer Uncovers Linux Kernel TLB Race Condition Bug(2 posts)→
More from Fun
- Gary Marcus says this week’s singularity talk is just “PR theater” — GaryMarcus · 2026-07-28
- Codex Ports Age of Empires II to the Browser, Playable Against AI — nickbaumann_ · 2026-07-28
- A joke says even returning a phone call now requires a real agent — jd_pressman · 2026-07-28
- EpochAI lets Sol run a stream alone, and it keeps inventing unhinged titles — Jsevillamol · 2026-07-28
- Sam Altman says Twitter rage bait is easy, soul-poisoning, and a waste for founders — casper_hansen_ · 2026-07-28
- 'Vibe Coding Your SaaS Replacement is Only Free if Your Time is Worthless' — jonathan_wilke · 2026-07-28