Re: power9 NUMA crash while reading debugfs imc_cmd

2019-06-29 Thread Michael Ellerman
Qian Cai writes: > On Fri, 2019-06-28 at 17:19 +0530, Anju T Sudhakar wrote: >> On 6/28/19 9:04 AM, Qian Cai wrote: >> > >> > > On Jun 27, 2019, at 11:12 PM, Michael Ellerman >> > > wrote: >> > > >> > > Qian Cai writes: >> > > > Read of debugfs imc_cmd file for a memory-less node will

Re: power9 NUMA crash while reading debugfs imc_cmd

2019-06-28 Thread Qian Cai
On Fri, 2019-06-28 at 17:19 +0530, Anju T Sudhakar wrote: > On 6/28/19 9:04 AM, Qian Cai wrote: > > > > > On Jun 27, 2019, at 11:12 PM, Michael Ellerman > > > wrote: > > > > > > Qian Cai writes: > > > > Read of debugfs imc_cmd file for a memory-less node will trigger a crash > > > > below > >

Re: power9 NUMA crash while reading debugfs imc_cmd

2019-06-28 Thread Anju T Sudhakar
On 6/28/19 9:04 AM, Qian Cai wrote: On Jun 27, 2019, at 11:12 PM, Michael Ellerman wrote: Qian Cai writes: Read of debugfs imc_cmd file for a memory-less node will trigger a crash below on this power9 machine which has the following NUMA layout. What type of machine is it? description:

Re: power9 NUMA crash while reading debugfs imc_cmd

2019-06-27 Thread Qian Cai
> On Jun 27, 2019, at 11:12 PM, Michael Ellerman wrote: > > Qian Cai writes: >> Read of debugfs imc_cmd file for a memory-less node will trigger a crash >> below >> on this power9 machine which has the following NUMA layout. > > What type of machine is it? description: PowerNV product:

Re: power9 NUMA crash while reading debugfs imc_cmd

2019-06-27 Thread Michael Ellerman
Qian Cai writes: > Read of debugfs imc_cmd file for a memory-less node will trigger a crash below > on this power9 machine which has the following NUMA layout. What type of machine is it? cheers > I don't understand why I only saw it recently on linux-next where it > was tested everyday. I can

power9 NUMA crash while reading debugfs imc_cmd

2019-06-27 Thread Qian Cai
Read of debugfs imc_cmd file for a memory-less node will trigger a crash below on this power9 machine which has the following NUMA layout. I don't understand why I only saw it recently on linux-next where it was tested everyday. I can reproduce it back to 4.20 where 4.18 seems work fine. # cat