From: Thomas Gleixner <tglx@linutronix.de>
To: Salvatore Bonaccorso <carnil@debian.org>
Cc: Paul Menzel <pmenzel@molgen.mpg.de>,
Jacob Pan <jacob.jun.pan@linux.intel.com>,
Len Brown <lenb@kernel.org>,
x86@kernel.org, LKML <linux-kernel@vger.kernel.org>,
linux-pm@vger.kernel.org, Steven Rostedt <rostedt@goodmis.org>,
Matthew Garrett <mjg59@google.com>
Subject: Re: [Linux 5.2.x] /sys/kernel/debug/tracing/events/power/cpu_idle/id: BUG: kernel NULL pointer dereference, address: 0000000000000000
Date: Sun, 11 Aug 2019 14:58:15 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.21.1908111456430.7324@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20190811094630.GA18925@eldamar.local>
Salvatore,
On Sun, 11 Aug 2019, Salvatore Bonaccorso wrote:
> On Sun, Aug 11, 2019 at 08:22:35AM +0200, Thomas Gleixner wrote:
> > On Sat, 10 Aug 2019, Paul Menzel wrote:
> > > For the record. It is also reproducible with Linux 5.2.6, and trying to print
> > > the file contents with cat already fails.
> > >
> > > ```
> > > $ sudo ls -l /sys/kernel/debug/tracing/events/power/cpu_idle/id
> > > -r--r--r-- 1 root root 0 Aug 10 23:05
> > > /sys/kernel/debug/tracing/events/power/cpu_idle/id
> > > $ sudo cat /sys/kernel/debug/tracing/events/power/cpu_idle/id
> > > Killed
> > > ```
>
> This seems to be related to https://bugs.debian.org/934304 (in
> particular https://bugs.debian.org/934304#29). The mentioned patch
> features/all/lockdown/0031-tracefs-Restrict-tracefs-when-the-kernel-is-locked-d.patch
> is a backport of https://patchwork.kernel.org/patch/11069661/ with
> only change that it is converted back to the non-LSM lockdown API.
So that's a debian kernel specific issue?
Thanks,
tglx
next prev parent reply other threads:[~2019-08-11 12:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4b54ff1e-f18b-3c58-7caa-945a0775c24c@molgen.mpg.de>
[not found] ` <alpine.DEB.2.21.1908101910280.7324@nanos.tec.linutronix.de>
[not found] ` <01c7bc6b-dc6d-5eca-401a-8869e02f7c2a@molgen.mpg.de>
2019-08-10 21:11 ` [Linux 5.2.x] /sys/kernel/debug/tracing/events/power/cpu_idle/id: BUG: kernel NULL pointer dereference, address: 0000000000000000 Paul Menzel
2019-08-11 6:22 ` Thomas Gleixner
2019-08-11 9:46 ` Salvatore Bonaccorso
2019-08-11 12:58 ` Thomas Gleixner [this message]
2019-08-11 15:33 ` Salvatore Bonaccorso
2019-08-12 15:28 ` Steven Rostedt
2019-08-12 16:24 ` Matthew Garrett
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