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SubjectRe: [PATCH v10 00/18] Enable FSGSBASE instructions
> So this is a check that checks if you're running in user mode if
> you have a debug trap with single step, but somehow it triggered
> for a user segment.
>
> Probably the regs got corrupted.
>
> Sasha, I suspect you're missing a mov %rsp,%rdi somewhere in the
> debug entry path that sets up the regs argument for the C code.

... Ah never mind. Thomas has a better explanation.

-Andi

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