Re: [lkp] [x86, perf] 7aba70e47c: BUG: unable to handle kernel paging request at 696d2f62

From: Peter Zijlstra
Date: Wed Nov 18 2015 - 11:27:52 EST

On Wed, Nov 18, 2015 at 02:33:00PM +0800, kernel test robot wrote:
> FYI, we noticed the below changes on
> perf/core
> commit 7aba70e47ca4e961acb5af96d5127e3fad651c7c ("x86, perf: Optimize stack walk user accesses")

Of course, that commit no longer exists. I re-create the tree every time
I push it, this means that if you report something a few days later, its
highly likely its against non-existant commits :/

> [ 21.984049] BUG: unable to handle kernel paging request at 696d2f62
> [ 21.986759] IP: [<4110c023>] perf_prepare_sample+0xcc/0x51d
> [ 21.987859] *pdpt = 0000000001a93001 *pde = 0000000000000000
> [ 21.988015] Oops: 0000 [#1] PREEMPT
> [ 21.988015] Modules linked in:
> [ 21.988015] CPU: 0 PID: 496 Comm: trinity-main Not tainted 4.3.0-01147-g7aba70e #1

That doesn't actually look like something the fingered patch touches.
And seeing how its trinity triggering it, I suspect bisection fail.
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