From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Danilo Cezar Zanella <danilo.zanella@iag.usp.br>
Cc: linux-rt-users@vger.kernel.org
Subject: Re: Exception in function_graph tracing
Date: Fri, 16 Sep 2022 22:05:53 +0200 [thread overview]
Message-ID: <YyTXIUjq9tmFPTDi@linutronix.de> (raw)
In-Reply-To: <CAAxUTH4zpibkhOS+NPzcYsXFqx1bJfSU19gdt0eCAOrpWAkinA@mail.gmail.com>
On 2022-09-13 16:21:27 [-0300], Danilo Cezar Zanella wrote:
> Hi
Hi,
> I'm getting the following error message when I set the current_tracer
> to function_graph. Procedures:
>
> cd / sys/kernel/tracing
> echo function_graph > current_tracer
>
> Then I saw the following message in the console.
>
> Unable to handle kernel paging request at virtual address fffffffc
…
> What is going on?
> Am I doing something wrong?
No, not as far I can tell. It looks like the function_graph tracer is
busted in v4.19 even without the PREEMPT_RT patch. The function tracer
seems to work.
> Thanks
>
> Danilo
Sebastian
next prev parent reply other threads:[~2022-09-16 20:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-13 19:21 Exception in function_graph tracing Danilo Cezar Zanella
2022-09-16 20:05 ` Sebastian Andrzej Siewior [this message]
[not found] ` <CAAxUTH4xawCFpnwpRkcaZ5fdzMEbZZmPOyVDoqdMrPrf+G64dg@mail.gmail.com>
2022-09-27 11:06 ` Sebastian Andrzej Siewior
2022-10-05 8:43 ` [PATCH] ARM: fix function graph tracer and unwinder dependencies Sebastian Andrzej Siewior
2022-10-05 16:43 ` Greg KH
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