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Asynchronous interrupt events handling

Technique

Asynchronous interrupt events handling is a technique identified in the DifuzzRTL work as one of several RTL-fuzzing adaptations for CPU designs. In the paper’s abstract, it is listed alongside cycle-sensitive register-coverage guidance, a unified CPU input format with Tilelink protocols, and drop-in-replacement designs as a DIFUZZRTL technique developed to address unique RTL design characteristics.

First seen 6/28/2026
Last seen 6/28/2026
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WIKI

Overview

Asynchronous interrupt events handling is presented in DifuzzRTL: Differential Fuzz Testing to Find CPU Bugs as one of the specialized techniques used by DIFUZZRTL, an RTL fuzzer for CPU designs. The paper places this technique in the context of adapting fuzzing to the specific challenges of CPU RTL, where standard software-oriented fuzzing assumptions do not directly apply.[1][2]

Role in DIFUZZRTL

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RELATIONSHIPS

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Asynchronous interrupt events handling is introduced as a new technique in the paper.
DiFuzzRTL ← implements 95% 1e
DIFUZZRTL incorporates handling of asynchronous interrupt events.

CITATIONS

5 sources
5 citations — click to expand
[1] Asynchronous interrupt events handling is named in the DifuzzRTL abstract as one of several new techniques developed for unique RTL design characteristics. DifuzzRTL: Differential Fuzz Testing to Find CPU Bugs
[2] DIFUZZRTL is an RTL fuzzer proposed to automatically discover unknown bugs in CPU RTLs. DifuzzRTL: Differential Fuzz Testing to Find CPU Bugs
[3] The abstract states that DIFUZZRTL uses a register-coverage guided fuzzing technique to identify RTL state transitions efficiently and correctly. DifuzzRTL: Differential Fuzz Testing to Find CPU Bugs
[4] The provided evidence does not describe the internal algorithm of asynchronous interrupt events handling; it only identifies it as a named technique within DIFUZZRTL. DifuzzRTL: Differential Fuzz Testing to Find CPU Bugs
[5] DifuzzRTL was evaluated on three open-source CPU RTLs and identified 16 new bugs, but the abstract does not attribute those results to asynchronous interrupt events handling specifically. DifuzzRTL: Differential Fuzz Testing to Find CPU Bugs