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SubjectRe: 2f47e7e19f ("x86/mm/kaiser: Use PCID feature to make user and .."): WARNING: CPU: 0 PID: 1 at mm/early_ioremap.c:114 __early_ioremap
On Mon, Nov 27, 2017 at 10:28:35AM -0800, Dave Hansen wrote:
> On 11/27/2017 10:03 AM, Eduardo Valentin wrote:
> > On top of VM crashes, on your branch:
> >
> >
> > I am also getting crashes in early userspace, during tlb flushes. When KAISER is enabled and whenever userspace is loaded, I get a stack trace around __do_page_fault() called from restore_regs_and_return_to_kernel(). I saw this very same behavior in your v3 branch (kaiser-414-tipwip-20171121) too.
> >
> > The crashes are followed by a machine halt via NMI. They also get the following warning:
> > WARNING: can't dereference iret registers at fffffffffe198048 for ip page_fault+0x11/0x60
> There was a known bug in my branch with not mapping some of the
> interrupt entry routines. Random alignment makes it break or work.
> Ingo/Thomas, correct me if I'm wrong, but I think we need folks testing
> here at the moment:
> >
> My tree from last week is ancient gunk at this point. :)

OK, thanks for let me know, I will give it a shot on the tip tree today and send feed back.

All the best,
Eduardo Valentin

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