On 2016-07-27 20:31, Al Viro wrote:

On Wed, Jul 27, 2016 at 04:45:43PM -0700, David Miller wrote:

quoted

quoted

I highly expect both my issue and OP's issue to revolve not around
commit e5a4b0bb803b specifically, but around other code that no longer
behaves as expected because of it.

Indeed, and that fault address rounding bug occurs two other times
in arch/sparc/lib/user_fixup.c

The mentioned patchwork patch should fix the bug and I'll get that
into my sparc tree, merged, and queued up for -stable ASAP.

Plausible for sparc, but I don't see similar __copy_to_user_inatomic()
bugs in case of x86_64...

I'm going to go ahead and say this is where my issue and the op's issue 
begin to branch apart from one another. He's seeing this on all incoming 
data, whereas i am only seeing it on ssl data and not on sun4v.

At this point i would say data from my issue is only going to cloud this 
issue as they seem to be two completely different issues revolving 
around the same commit. If i come across any relevant data for x86_64 
ill be sure to post it if this isn't resolved by then, but for now i'm 
going to refrain from submitting anything sparc related.