Process vs Thread (and the Risks of Shared Memory)

Phone ScreenxAILast reported January 2026Medium Frequency
Reported
4× across candidate reports
First seen
March 2025
Last reported
January 2026
Reported outcome
mixed

Problem Overview

An OS-fundamentals question asked verbally in the phone screen — unexpected from an AI lab, and reported 4 times between March 2025 and January 2026. Explain the difference between a process and a thread (often framed as multi-processing versus multi-threading), then handle the standard escalation: do threads share memory with…

  • 3 candidate-reported follow-ups — the exact probes interviewers asked, with the trigger for each
  • The rest of the problem statement — full requirements, constraints, and edge cases
  • Approach and trade-offs — what passing candidates did, and the mistakes that sink people
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Verified Source
Every question is reconstructed from multiple independent candidate reports. Verbatim follow-ups, not invented ones.
Codex Fact-Checked
Technical claims, formulas, and scale numbers are reviewed against primary sources.
Interviewer Follow-ups
The exact follow-ups reported by candidates, with the trigger that prompts each one — plus the mistakes that sink people.
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