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SubjectRe: perf: perf_fuzzer quickly locks up on 4.15-rc7
On Thu, 11 Jan 2018, Vince Weaver wrote:

> On Thu, 11 Jan 2018, Peter Zijlstra wrote:
>
> > On Thu, Jan 11, 2018 at 01:21:12PM -0600, Josh Poimboeuf wrote:
> > > Yuck. This time it was stack recursion on the entry stack. In the
> > > previous error, recursion was detected on the IRQ stack. Otherwise they
> > > look quite similar.
> > >
> > > Was that also with nopti?
> >
> > Both with pti enabled, nopti makes things work again.
>
> I think I have hit those errors even with pti disabled but now I'll have
> to double check.

I can confirm this, I am able to trigger the stack recursion warning even
when "pti=off" is set.

Jan 11 15:34:47 core2 kernel: [ 320.668900] WARNING: stack recursion on stack type 4
Jan 11 15:34:47 core2 kernel: [ 320.668909] WARNING: can't dereference registers at 00000000d5ae0491 for ip swapgs_restore_regs_and_return_to_usermode+0x28/0x7c

Vince

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