Re: [PATCH 0/3] ftrace, orc, x86, tracing: Fix stack traces again

[Steven Rostedt]

On Wed, 24 Jan 2018 03:49:04 -0500
Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:

> On Wed, 24 Jan 2018 08:46:50 +0100
> Ingo Molnar <mingo@xxxxxxxxxx> wrote:
> 
>  
> > No fundamental objections from me, assuming they are well tested.
> >  
> 
> Yeah, I ran it through my ftrace test suite, and they did fine till I
> hit test 20 of 34, which tests static ftrace (CONFIG_DYNAMIC_FTRACE not
> set), and it crashed. I'm hoping to have it fixed and retested today.
>

Looking at the crash output, it was hung tasks and not an actual crash.
This is the first time I ran this test on 4.15-rc9, I'll make sure it's
not something associated with rc9 before blaming my patches. With
DYNAMIC_FTRACE disabled, the machine runs much slower. With all the PTI
work, it could possibly pushed it passed a breaking point.

-- Steve