From: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
To: Stephen Boyd <sboyd@kernel.org>, Steven Rostedt <rostedt@goodmis.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>,
Andy Gross <andy.gross@linaro.org>,
David Brown <david.brown@linaro.org>,
Jiri Slaby <jslaby@suse.com>, Kees Cook <keescook@chromium.org>,
"Joel Fernandes (Google)" <joel@joelfernandes.org>,
Geliang Tang <geliangtang@gmail.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Pramod Gurav <gpramod@codeaurora.org>,
linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org,
linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
Rajendra Nayak <rnayak@codeaurora.org>,
Vivek Gautam <vivek.gautam@codeaurora.org>,
Sibi Sankar <sibis@codeaurora.org>
Subject: Re: Crash in msm serial on dragonboard with ftrace bootargs
Date: Wed, 17 Oct 2018 16:57:42 +0530 [thread overview]
Message-ID: <17116a6b-156e-af2f-c20c-88bea10bfc92@codeaurora.org> (raw)
In-Reply-To: <153972306834.5275.7510298070540576604@swboyd.mtv.corp.google.com>
On 10/17/2018 2:21 AM, Stephen Boyd wrote:
> Quoting Sai Prakash Ranjan (2018-10-16 12:35:57)
>> On 10/17/2018 12:45 AM, Steven Rostedt wrote:
>>> On Wed, 17 Oct 2018 00:36:05 +0530
>>> Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.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@codeaurora.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.
>>
>
> Have you tried with earlycon and no ftrace things on the commandline?
>
> root=/dev/disk/by-partlabel/rootfs rw rootwait earlycon console=ttyMSM0,115200n8
>
> If earlycon is causing problems, it sounds like this may be another case
> of earlycon uart handing off to the uart driver and that failing because
> something gets printed while the uart is transitioning from the earlycon
> console to the kernel boot console. I recall the uart would trample on
> itself in interesting ways.
>
Yes I have tried with only earlycon enabled and everything is fine.
Issue is reproduced only with ftrace=function cmdline.
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
next prev parent reply other threads:[~2018-10-17 11:27 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-16 11:38 Crash in msm serial on dragonboard with ftrace bootargs Sai Prakash Ranjan
2018-10-16 11:44 ` Greg Kroah-Hartman
2018-10-16 11:58 ` Sai Prakash Ranjan
2018-10-16 15:29 ` Steven Rostedt
2018-10-16 16:35 ` Sai Prakash Ranjan
2018-10-16 16:57 ` Steven Rostedt
2018-10-16 17:36 ` Sai Prakash Ranjan
2018-10-16 17:48 ` Steven Rostedt
2018-10-16 18:05 ` Sai Prakash Ranjan
2018-10-16 18:16 ` Steven Rostedt
2018-10-16 18:25 ` Sai Prakash Ranjan
2018-10-16 18:41 ` Steven Rostedt
2018-10-16 19:01 ` Sai Prakash Ranjan
2018-10-16 19:03 ` Steven Rostedt
2018-10-16 19:06 ` Sai Prakash Ranjan
2018-10-16 19:15 ` Steven Rostedt
2018-10-16 19:16 ` Steven Rostedt
2018-10-16 19:37 ` Sai Prakash Ranjan
2018-10-16 19:35 ` Sai Prakash Ranjan
2018-10-16 20:51 ` Stephen Boyd
2018-10-17 11:27 ` Sai Prakash Ranjan [this message]
2018-10-18 2:33 ` Steven Rostedt
2018-10-18 5:21 ` Sai Prakash Ranjan
2018-10-18 13:17 ` Steven Rostedt
2018-10-19 4:17 ` Joel Fernandes
2018-10-19 6:54 ` Sai Prakash Ranjan
2018-10-19 13:51 ` Steven Rostedt
2018-10-19 14:48 ` Sai Prakash Ranjan
2018-10-19 15:12 ` Steven Rostedt
2018-10-25 14:36 ` saiprakash.ranjan
2018-11-13 9:44 ` Srinivas Kandagatla
2018-11-15 10:33 ` Sai Prakash Ranjan
2018-11-15 10:53 ` Srinivas Kandagatla
2018-11-16 3:39 ` Viresh Kumar
2018-11-16 10:49 ` Sai Prakash Ranjan
2018-10-16 17:02 ` Kees Cook
2018-10-17 10:13 ` Joel Fernandes
2018-10-17 11:38 ` Sai Prakash Ranjan
2018-10-17 14:49 ` Sai Prakash Ranjan
2018-10-17 17:56 ` Joel Fernandes
2018-10-17 18:25 ` Kees Cook
2018-10-16 23:09 ` Joel Fernandes
2018-10-17 11:53 ` Sai Prakash Ranjan
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