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A comment on Doom crash after 2.5 years of real-world runtime confirmed on real hardware. Parent comment

Re:Doom crash after 2.5 years of real-world runtime confirme... by tekne on Wednesday September 17, 2025 @05:25PM (#45281571)
Umm, signed integers are UB on overflow; unsigned is always fine.
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Re:Doom crash after 2.5 years of real-world runtime confirme... by jbreckmckye on Thursday September 18, 2025 @08:43AM (#45288937)
Sorry, you are correct. I don't think unsigned overflow behaviour was defined until C99 though.

Anyway, in answer to the question, I would guess the reason was because of signed / unsigned type promotion.

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