linux-kernel - Re: [PATCH 2/4] ftrace/instances: Clear function triggers when removing instances

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Message-ID: <20170515112115.36825c24@gandalf.local.home>
Date:   Mon, 15 May 2017 11:21:15 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:     Shuah Khan <shuah@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH 2/4] ftrace/instances: Clear function triggers when
 removing instances

On Sun, 14 May 2017 01:01:02 +0530
"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> wrote:

> If instance directories are deleted while there are registered function
> triggers:
> 
>   # cd /sys/kernel/debug/tracing/instances
>   # mkdir test
>   # echo "schedule:enable_event:sched:sched_switch" > test/set_ftrace_filter
>   # rmdir test
>   Unable to handle kernel paging request for data at address 0x00000008
>   Unable to handle kernel paging request for data at address 0x00000008
>   Faulting instruction address: 0xc0000000021edde8
>   Oops: Kernel access of bad area, sig: 11 [#1]
>   SMP NR_CPUS=2048
>   NUMA
>   pSeries

Looks like this patch needs to be marked for stable, and go in right
away. I may also do the same for the ftracetest bashism patch with
Masami's approval. I may also slip in the ftracetest for the bug that
this patch fixes.

The first patch can go into the queue for 4.13.

-- Steve