perf: fuzzer causes stack going in wrong direction warnings

[Vince Weaver]

Hello

I reported this back in January, but I think it got lost since everyone 
was busy with other more pressing matters.

But in any case, the perf_fuzzer still can trigger these type of messages 
and just wanted to see if they were a cause for concern, or just noise.

[66620.496076] WARNING: can't dereference registers at 0000000051f78a40 for ip interrupt_entry+0xba/0xc0
[66620.506117] WARNING: stack recursion on stack type 4
[67126.898984] WARNING: stack going in the wrong direction? ip=native_sched_clock+0xd/0x90
[67148.214712] WARNING: can't dereference iret registers at 00000000c8f3c864 for ip error_exit+0x20/0x20


Vince