Re: [RFC PATCH] Fix: x86 unaligned __memcpy to/from virtual memory

[Linus Torvalds]

On Wed, Jun 24, 2015 at 4:54 PM, Mathieu Desnoyers
<mathieu.desnoyers@xxxxxxxxxxxx> wrote:
>
> OK, see below. This time the fault occurred at an unaligned address.
> It fails on the !pte_present(*pte_ref) check.

So every time, %rcx is 0x001fb.

Once, your rdx value (which is remaining bytes after the movsq) was 3,
the other two times it's 0.

What's so magical about that 4056-byte copy (+3 bytes once)? Are you
*sure* that copy is valid?

                   Linus
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