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

On 2/26/20 10:45 PM, Vlastimil Babka wrote:

if (node == NUMA_NO_NODE)
    page = alloc_pages(flags, order);
else
    page = __alloc_pages_node(node, flags, order);

So yeah looks like SLUB's kmalloc_node() is supposed to behave like the
page allocator's __alloc_pages_node() and respect __GFP_THISNODE but not
enforce it by itself. There's probably just some missing data structure
initialization somewhere right now for memoryless nodes.

Upon more digging, I think the problem could manifest if
node_to_mem_node(0) (_node_numa_mem_[0]) returned 0 instead of 1,
because it wasn't initialized properly for a memoryless node. Can you
e.g. print it somewhere?