linux-kernel - Re: [Linux 5.2.x] /sys/kernel/debug/tracing/events/power/cpu_idle/id: BUG: kernel NULL pointer dereference, address: 0000000000000000

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Date:   Mon, 12 Aug 2019 09:24:30 -0700
From:   Matthew Garrett <mjg59@...gle.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Salvatore Bonaccorso <carnil@...ian.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Paul Menzel <pmenzel@...gen.mpg.de>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Len Brown <lenb@...nel.org>, x86@...nel.org,
        LKML <linux-kernel@...r.kernel.org>, linux-pm@...r.kernel.org
Subject: Re: [Linux 5.2.x] /sys/kernel/debug/tracing/events/power/cpu_idle/id:
 BUG: kernel NULL pointer dereference, address: 0000000000000000

On Mon, Aug 12, 2019 at 8:29 AM Steven Rostedt <rostedt@...dmis.org> wrote:

> From what I understand, Matthew's "lockdown" work is to prevent the
> system from doing anything to see what is happening in the kernel. This
> includes tracefs. This looks like it is working as designed.

Oopsing the kernel isn't working as designed. Ben has a patch to fix this.