linux-kernel - Re: Crash in msm serial on dragonboard with ftrace bootargs

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Date:   Tue, 16 Oct 2018 15:15:16 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Cc:     Stephen Boyd <sboyd@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Jiri Slaby <jslaby@...e.com>,
        Kees Cook <keescook@...omium.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        Geliang Tang <geliangtang@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Pramod Gurav <gpramod@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Sibi Sankar <sibis@...eaurora.org>
Subject: Re: Crash in msm serial on dragonboard with ftrace bootargs

On Wed, 17 Oct 2018 00:36:05 +0530
Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org> wrote:

> On 10/17/2018 12:33 AM, Steven Rostedt wrote:
> > On Wed, 17 Oct 2018 00:31:03 +0530
> > Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org> wrote:
> >   
> >> Haa seems like you are right! With "ftrace=function
> >> ftrace_filter=msm_read" , I can trigger the crash, but
> >> sadly "ftrace_notrace=msm_read" also crashes.  
> > 
> > So there's more than one problem area.
> > 
> > What about ftrace_notrace=m*
> > 
> > ?
> >   
> 
> That too crashes.
> 

Which compiler are you using and can you send me your config.

I wonder if there's something screwing up with the way ftrace nops are
working on this board.

A couple things of note, 1) it works fine after boot up. 2) it crashes
in the initcall code, so it's not due to ftrace being enabled too early.

I'd like to see the full command line as well. I bet if you remove the
qcom,msm-uartdm from the command line, and had just ftrace=function, it
may also boot fine too. Can you try that?

-- Steve