Re: [PATCH v3] mm: fix panic in __alloc_pages

Alexey Makhalov
2021-12-09T19:01:08Z

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> On Dec 9, 2021, at 5:29 AM, Michal Hocko <mhocko@suse.com> wrote:
>
> On Thu 09-12-21 10:23:52, Alexey Makhalov wrote:
>>
>>
>>> On Dec 9, 2021, at 1:56 AM, Michal Hocko <mhocko@suse.com> wrote:
>>>
>>> On Thu 09-12-21 09:28:55, Alexey Makhalov wrote:
>>>>
>>>>
>>>> [ 0.081777] Node 4 uninitialized by the platform. Please report with boot dmesg.
>>>> [ 0.081790] Initmem setup node 4 [mem 0x0000000000000000-0x0000000000000000]
>>>> ...
>>>> [ 0.086441] Node 127 uninitialized by the platform. Please report with boot dmesg.
>>>> [ 0.086454] Initmem setup node 127 [mem 0x0000000000000000-0x0000000000000000]
>>>
>>> Interesting that only those two didn't get a proper arch specific
>>> initialization. Could you check why? I assume init_cpu_to_node
>>> doesn't see any CPU pointing at this node. Wondering why that would be
>>> the case but that can be a bug in the affinity tables.
>>
>> My bad shrinking. Not just these 2, but all possible and not present nodes from 4 to 127
>> are having this message.
>
> Does that mean that your possible (but offline) cpus do not set their
> affinity?
>
Hi Michal,

I didn’t quite gut a question here. Do you mean scheduler affinity for offlined/not present CPUs?
From the patch, this message should be printed for every possible offlined node:
for_each_node(nid) {
...
if (!node_online(nid)) {
pr_warn("Node %d uninitialized by the platform. Please report with boot dmesg.\n", nid);

Thanks,
—Alexey

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