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Achievement: Pull Sharkx4Achievement: Pair ExtraordinaireAchievement: QuickdrawAchievement: YOLO

Achievements

Achievement: Pull Sharkx4Achievement: Pair ExtraordinaireAchievement: QuickdrawAchievement: YOLO

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u7k4rs6/README.md
Utkarsh Bahuguna

CS at BITS Pilani. I build systems, then build the harnesses that break them.
41 PRs merged upstream across 11 organisations, including GCC, Microsoft, PyTorch, NVIDIA, Hugging Face and CNCF.

  • A patch of mine is in GCC master. gccrs#4731 went upstream in a maintainer's sync, authorship kept.
  • 14 of those 41 fix bugs I found and reported myself, not tickets off a board. One was in my own merged code.
  • I found nondeterminism in vLLM's deterministic mode (vllm#51187): repeats match only if every token is reduced at the same RMSNorm block width.
  • Sole author of a COLM 2026 workshop paper. When Self-Consistency Backfires: majority voting lowers accuracy on 56–66% of GPQA Diamond problems.

Open source

Project Merged
microsoft/PyRIT 14 · the CodeAttack converter, plus fixes to TAP/PAIR, scale scorers and dataset loaders
gccrs · GCC Rust frontend 8 · match arm guards, left-to-right argument evaluation, a dead-code fix now in GCC master
PyTorch · executorch, torchtitan 6 · Inspector crashes on non-finite output, wandb tag splitting, scheduler range checks
jaeger-ui · CNCF 4 · GenAI span classification, media rendering, RFC wire-format corrections
NVIDIA/garak 1 · fixed Bedrock scans that failed for every Claude 4.x user
huggingface/OpenEnv 1 · SSRF-safe URL parsing
dottxt-ai/outlines 1 · RFC 4291 IPv6 structured-output type
Also llm-compressor ×2, AI Village ×2, openkruise/agents, openyurtio/raven

Building
thrice Reproduces a reported bug three times in parallel browsers. Precision 0.80, recall 0.80, every attempt published including the two it got wrong.
Lockstep An inference engine and a certifier that checks output stays bit-identical however requests are batched.
Shadowbook A limit order book in Rust. 416ns p50 insert, 100M fuzzed ops against an oracle, zero divergences.
Flint An x86-64 kernel in Rust. Ring 3 isolation proven by a breakout harness.
Blink Your own copy of an open source app, running in five seconds. Gone in ten minutes. Live

More, including Starling, CAIRN and MIRR, at utkarshbahuguna.me.

I publish what the measurements say. When all-pairs comparison showed half of a Lockstep finding was an artifact, the retraction went next to the result.

Rust C++ Python CUDA/Triton Go Java TypeScript

Portfolio  ·  LinkedIn  ·  Email

Pinned Loading

  1. LockStep LockStep Public

    A verification harness for deterministic LLM inference. Finds non-determinism before your benchmarks do.

    Python 8

  2. Shadowbook Shadowbook Public

    A Rust limit order book matching engine, differentially fuzzed against an independent reference. The bugs were in the machinery checking the engine, not the engine

    Rust 1

  3. Starling Starling Public

    A from-scratch CRDT collaborative text editor in TypeScript. Real-time, offline-first, and provably convergent, with no server resolving conflicts.

    TypeScript 1

  4. Tessera Tessera Public

    Decentralized, poisoning-resistant distribution for ML models and datasets. Publishers sign once, untrusted mirrors distribute, and any consumer verifies the exact signed bytes with full provenance.

    Python 1

  5. CAIRN CAIRN Public

    Self-hosted Git host on a from-scratch VCS engine in Java: content-addressable object store, packfiles with delta compression, three-way merge, and smart-HTTP transport, all cross-verified against …

    Java 1

  6. Flint Flint Public

    x86-64 kernel written from scratch in Rust and inline asm. Paging, frame allocator, kernel heap, preemptive scheduler, IDT/PIC interrupt path, and a shell. Runs under QEMU.

    Rust 1