[5.6.0-rc2-next-20200218/powerpc] Boot failure on POWER9

[Sachin Sant]

> On 27-Feb-2020, at 5:42 PM, Michal Hocko <mhocko at kernel.org> wrote:
> 
> A very good hint indeed. I would do this
> diff --git a/include/linux/topology.h b/include/linux/topology.h
> index eb2fe6edd73c..d9f1b6737e4d 100644
> --- a/include/linux/topology.h
> +++ b/include/linux/topology.h
> @@ -137,6 +137,8 @@ static inline void set_numa_mem(int node)
> {
> 	this_cpu_write(_numa_mem_, node);
> 	_node_numa_mem_[numa_node_id()] = node;
> +	pr_info("%s %d -> %d\n", __FUNCTION__, numa_node_id(), node);
> +	dump_stack();
> }
> #endif
> 
> Btw. it would be also helpful to get
> `faddr2line ___slab_alloc+0x334' from your kernel Sachin.

[linux-next]# ./scripts/faddr2line ./vmlinux ___slab_alloc+0x334 
___slab_alloc+0x334/0x760:
new_slab_objects at mm/slub.c:2478
(inlined by) ___slab_alloc at mm/slub.c:2628
[linux-next]# 

I have also attached boot log with a kernel that include about change.
I see the following o/p during boot:

[    0.005269] set_numa_mem 1 -> 1
[    0.005270] CPU: 12 PID: 0 Comm: swapper/12 Not tainted 5.6.0-rc3-next-20200227-autotest+ #6
[    0.005271] Call Trace:
[    0.005272] [c0000008b37dfe80] [c000000000b5d948] dump_stack+0xbc/0x104 (unreliable)
[    0.005274] [c0000008b37dfec0] [c000000000059320] start_secondary+0x600/0x6e0
[    0.005277] [c0000008b37dff90] [c00000000000ac54] start_secondary_prolog+0x10/0x14

Thanks
-Sachin

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