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You're probably remembering the bug where the big and little cores had different cache line sizes (https://www.mono-project.com/news/2016/09/12/arm64-icache/).

Wow. I mis remembered that quite spectacularly. Whoops.

https://medium.com/@niaow/a-big-little-problem-a-tale-of-big...

That seems like a too stupid bug to have existed in a production system.

However, there was a real problem a few years ago with some Samsung Exynos processors, where the cache line size was different between the big and the little cores.

A few programs made assumptions about the cache line size and had weird behavior after starting on one kind of core, then being migrated on the other kind of core.

Haha. That sounds like a joke playing off the BIG.little name. I'd like to read about that.

Indeed. But apparently I was mistaken. It was the story about the different cache lines on the Exynos.