On 3/19/20 1:32 AM, Michael Ellerman wrote:
> Seems like a nice solution to me
Thanks :)
>> 8<
>> diff --git a/mm/slub.c b/mm/slub.c
>> index 17dc00e33115..1d4f2d7a0080 100644
>> --- a/mm/slub.c
>> +++ b/mm/slub.c
>> @@ -1511,7 +1511,7 @@ static inline struct page *alloc_slab_page(struct
Michael Ellerman writes:
> Vlastimil Babka writes:
>> On 3/18/20 11:02 AM, Michal Hocko wrote:
>>> On Wed 18-03-20 12:58:07, Srikar Dronamraju wrote:
Calling a kmalloc_node on a possible node which is not yet onlined can
lead to panic. Currently node_present_pages() doesn't verify the
Vlastimil Babka writes:
> On 3/18/20 11:02 AM, Michal Hocko wrote:
>> On Wed 18-03-20 12:58:07, Srikar Dronamraju wrote:
>>> Calling a kmalloc_node on a possible node which is not yet onlined can
>>> lead to panic. Currently node_present_pages() doesn't verify the node is
>>> online before
On Wed 18-03-20 12:53:32, Vlastimil Babka wrote:
[...]
> Yes. So here's an alternative proposal for fixing the current situation in
> SLUB,
> before the long-term solution of having all possible nodes provide valid pgdat
> with zonelists:
>
> - fix SLUB with the hunk at the end of this mail -
On 3/18/20 11:02 AM, Michal Hocko wrote:
> On Wed 18-03-20 12:58:07, Srikar Dronamraju wrote:
>> Calling a kmalloc_node on a possible node which is not yet onlined can
>> lead to panic. Currently node_present_pages() doesn't verify the node is
>> online before accessing the pgdat for the node.
On Wed 18-03-20 16:32:15, Srikar Dronamraju wrote:
> * Michal Hocko [2020-03-18 11:02:56]:
>
> > On Wed 18-03-20 12:58:07, Srikar Dronamraju wrote:
[...]
> > > -#define node_present_pages(nid) (NODE_DATA(nid)->node_present_pages)
> > > -#define node_spanned_pages(nid)
* Michal Hocko [2020-03-18 11:02:56]:
> On Wed 18-03-20 12:58:07, Srikar Dronamraju wrote:
> > Calling a kmalloc_node on a possible node which is not yet onlined can
> > lead to panic. Currently node_present_pages() doesn't verify the node is
> > online before accessing the pgdat for the node.
On Wed 18-03-20 12:58:07, Srikar Dronamraju wrote:
> Calling a kmalloc_node on a possible node which is not yet onlined can
> lead to panic. Currently node_present_pages() doesn't verify the node is
> online before accessing the pgdat for the node. However pgdat struct may
> not be available
Calling a kmalloc_node on a possible node which is not yet onlined can
lead to panic. Currently node_present_pages() doesn't verify the node is
online before accessing the pgdat for the node. However pgdat struct may
not be available resulting in a crash.
NIP [c03d55f4]
