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

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Message-ID: <7781815e-cba2-9e36-db6d-268298747876@codeaurora.org>
Date:   Wed, 17 Oct 2018 00:31:03 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Steven Rostedt <rostedt@...dmis.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 10/17/2018 12:11 AM, Steven Rostedt wrote:
> On Tue, 16 Oct 2018 23:55:14 +0530
> Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org> wrote:
> 
>> On 10/16/2018 11:46 PM, Steven Rostedt wrote:
>>>
>>> [ Removed ivan.ivanov@...aro.org due to getting mail delivery errors ]
>>>
>>> On Tue, 16 Oct 2018 23:35:00 +0530
>>> Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org> wrote:
>>>    
>>>> Ok got it, this sounds fun. I'll give it a try.
>>>
>>> Awesome, I'm looking forward to seeing what you come up with.
>>>    
>>
>> Now, I can trigger this crash reboot with "ftrace=function
>> ftrace_filter=f*,g*,h*,i*,j*,k*,l*,m*,n*,o*,p*,q*"
> 
> Does it crash with just "f*" or "g*" or any singularity of the above?
> 
> Hmm, I wonder if it is from tracing msm_read?
> 

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.

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