linux-kernel - Re: d57108d4f6 ("watchdog/core: Get rid of the thread .."): BUG: unable to handle kernel NULL pointer dereference at 0000000000000208

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Message-ID: <alpine.DEB.2.20.1709151452470.1890@nanos>
Date:   Fri, 15 Sep 2017 14:54:43 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     kernel test robot <fengguang.wu@...el.com>
cc:     LKP <lkp@...org>, LKML <linux-kernel@...r.kernel.org>,
        Don Zickus <dzickus@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, wfg@...ux.intel.com,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: d57108d4f6 ("watchdog/core: Get rid of the thread .."): BUG:
 unable to handle kernel NULL pointer dereference at 0000000000000208

On Fri, 15 Sep 2017, Thomas Gleixner wrote:

> On Fri, 15 Sep 2017, kernel test robot wrote:
> > [    0.035023] CPU: Intel Common KVM processor (family: 0xf, model: 0x6, stepping: 0x1)
> > [    0.042302] Performance Events: unsupported Netburst CPU model 6 no PMU driver, software events only.
> 
> Cute. So there is no supported PMU, but for some unknown reason the lockup
> detector can create an event, otherwise the perf availaibility check in
> lockup_detector_init() would fail ....
> 
> Peter???

In my VM the corresponding dmesg is:

[    0.038086] Performance Events: unsupported p6 CPU model 61 no PMU driver, software events only.
[    0.041031] Hierarchical SRCU implementation.
[    0.046210] NMI watchdog: Perf event create on CPU 0 failed with -2
[    0.046980] NMI watchdog: Perf NMI watchdog permanetely disabled

Confused