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

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Message-ID: <0b014d85-9988-0bf5-7b72-911dbbcdadfc@codeaurora.org>
Date:   Wed, 17 Oct 2018 01:05:57 +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 12:45 AM, Steven Rostedt wrote:
> 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.
> 
Config attached.

Compiler: aarch64-linux-gnu-gcc (Linaro GCC 6.3-2017.02) 6.3.1 20170109

> 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?
> 

Kernel command line: root=/dev/disk/by-partlabel/rootfs rw rootwait 
ftrace=function ftrace_notrace=m* earlycon console=ttyMSM0,115200n8

qcom,msm-uartdm is not in command line, it is the earlycon. So without 
earlycon(bootconsole), board boots fine as we discussed earlier.

Thanks,
Sai

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