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SubjectRe: [PATCH v12 0/3] tracing: Centralize preemptirq tracepoints and unify their usage
On Thu, 2 Aug 2018 19:57:09 -0700
Joel Fernandes <joelaf@google.com> wrote:

> Hi Masami,
>
> On Thu, Aug 2, 2018 at 7:55 AM, Masami Hiramatsu <mhiramat@kernel.org> wrote:
> > Hi Joel,
> >
> > I found this caused several issues when testing ftrace.
> >
> > #1) ftrace boottest (FTRACE_STARTUP_TEST) fails
>
> This sadly appears to be a real issue. The startup test for
> "preemptirqsoff" tracer fails, however it passes for only preemptoff
> or only irqsoff. I tested only the last 2 tracers, not the first one,
> that's why I didn't catch it. I need to debug this more.

I found that this does not always happen, but 4 out of 5 it happens.

Thank you,

--
Masami Hiramatsu <mhiramat@kernel.org>

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