Linus Torvalds used large language model (LLM) tools to make Linux’s assoc_array code easier to follow; a user-space test harness then confirmed one bug Nils Ollrogge had already reported and found three more, for four findings total. In a report published October 12, 2026, Michael Larabel at Phoronix reproduced Torvalds’s account of the work.
The LLM-assisted work focused on readability
Torvalds described an LLM-assisted branch that split some of assoc_array’s larger, harder-to-read functions to make the code more readable. The episode concerned this Linux kernel library, with the test harness running in user space—outside the kernel.
The sequence matters: Ollrogge had reported a bug and proposed a fix; Torvalds used LLM tools to help make the code easier to understand; then the harness tested the code. The harness confirmed Ollrogge’s reported bug and uncovered three additional bugs.
A separate Torvalds effort used Claude Code on a performance-focused Linux branch, covered in NeoTeo’s earlier report. The assoc_array review was a different episode.
The three additional bugs dated to 2013
Torvalds traced the three additional bugs to the first commit that added assoc_array in 2013. That makes the reported result four findings in all: one bug Ollrogge had reported, which the harness confirmed, plus three more found during testing.
What Phoronix reported about the patches
Phoronix said the patches had not been merged into the master branch as of its October 12, 2026 report. It described Linux 7.4’s merge window as the presumed destination for the patches.
