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

[Thomas Gleixner]

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