3.13 Oops on ppc64_cpu --smt=off

[Alexander Graf]

On 02.12.2013, at 05:01, Preeti U Murthy <preeti at linux.vnet.ibm.com> wrote:

> Hi,
> 
> On 11/30/2013 11:15 PM, Alexander Graf wrote:
>> Hi Ben,
>> 
>> With current linus master (3.13-rc2+) I'm facing an interesting issue with
> 
> SMT disabling on p7. When I trigger the cpu offlining it works as expected,
> but after a few seconds the machine goes into an oops as you can see below.
>> 
>> It looks like a null pointer dereference.
> 
> tip/sched/urgent has the below fix. Can you please apply the following it and
> check if the issue gets resolved?  A similar issue was reported earlier as

I've disabled NO_HZ now on that machine which also "fixed" it for me. Unfortunately I can't reboot that box for at least the next week now to test whether the patch does fix the issue.


Alex