Pentium FDIV Bug

Concept

The Pentium FDIV Bug is referenced in CPU verification literature as a reported CPU hardware bug. In the cited evidence, it is used as an example supporting the need for rigorous pre-deployment CPU and RTL verification because deployed hardware defects can be difficult and costly to mitigate.

First seen 5/27/2026

Last seen 6/3/2026

Evidence 1 chunks

Wiki v1

WIKI

Overview

The Pentium FDIV Bug is identified in the provided evidence as one of several reported CPU bugs, listed alongside the Broadwell MCE bug and the Ryzen segfault bug. The same source contrasts these reported bugs with the well-known Meltdown and Spectre issues and characterizes CPU bugs as "notorious." [C1]

Technical significance

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NEIGHBORHOOD

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RELATIONSHIPS

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CPU Bug Detection ← mentions 95% 3e

CPU bug detection research mentions the Pentium FDIV bug as a notorious hardware bug.

CPU ← mentions 95% 1e

The Pentium FDIV bug is mentioned as one of numerous CPU bugs costing manufacturers billions.

CPU Bug Detection mentions → 90% 1e

The Pentium FDIV bug is mentioned as a real-world CPU bug motivating detection work.

LINKED ENTITIES

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CPU Bug Detection MENTIONS Extracted graph relationship

CITATIONS

4 sources

4 citations — click to collapse

[1] Pentium FDIV Bug is listed as one of numerous reported CPU bugs alongside Broadwell MCE bug and Ryzen segfault bug, while Meltdown and Spectre are described as well-known CPU bugs. [2401.15967] Instiller: Towards Efficient and Realistic RTL Fuzzing

[2] Hardware CPU bugs need to be detected before deployment, and CPU circuits and RTL designs should be thoroughly verified before deployment. [2401.15967] Instiller: Towards Efficient and Realistic RTL Fuzzing

[3] After CPU deployment, removing the impact of hardware vulnerabilities is described as nearly impracticable, and CPU bugs can cost manufacturers millions or billions of dollars in mitigation and repair. [2401.15967] Instiller: Towards Efficient and Realistic RTL Fuzzing

[4] CPU bug detection work includes static and dynamic techniques, and fuzz testing is described as one of the promising approaches for CPU verification. [2401.15967] Instiller: Towards Efficient and Realistic RTL Fuzzing