On Wed, Nov 18, 2015 at 02:33:00PM +0800, kernel test robot wrote:
> FYI, we noticed the below changes on
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git 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.