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I mean… good for you. How does that help me when my software crashes because they changed some API?

Which userspace API was changed?

Internal Kernel API changes all the time which can break proprietary drivers. But userspace API has a far higher guarantee.

setsockopt changing behaviour and crashing processes.

What user space APIs have they been routinely breaking?

The ones to manage IP filtering rules for example. Those APIs are even security-critical.

setsockopt that do nothing easily go to crashing the process in later versions…