On Wed, Mar 04, 2015 at 08:06:51PM +0100, Oleg Nesterov wrote:
> Thanks. I'll try to investigate tomorrow.
>
> Well, the kernel crashes because xrstor_state() is buggy, Quentin already
> has a fix.
>
> But #GP should be explained...
Could it be one of those conditions for which XRSTORS #GPs, like
"If XRSTORS attempts to load MXCSR with an illegal value, a
general-protection exception (#GP) occurs."
for example? I'm looking at the SDM section for XRSTORS.
I mean, math_state_restore() does init_fpu() and down that road we're
allocating an FPU state ... but we did init_fpu() before too, in
eager_fpu_init(). So what changed?
Maybe I'm looking in a totally wrong direction, it is too late here to
stare at FPU code anyway...
Thanks.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
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