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SubjectRe: WARNING in kvmalloc_node
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On 2018年02月14日 17:28, Daniel Borkmann wrote:
> [ +Jason, +Jesper ]
>
> On 02/14/2018 09:43 AM, Michal Hocko wrote:
>> On Tue 13-02-18 18:55:33, Matthew Wilcox wrote:
>>> On Tue, Feb 13, 2018 at 03:59:01PM -0800, syzbot wrote:
>> [...]
>>>> kvmalloc include/linux/mm.h:541 [inline]
>>>> kvmalloc_array include/linux/mm.h:557 [inline]
>>>> __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:474 [inline]
>>>> ptr_ring_init include/linux/ptr_ring.h:492 [inline]
>>>> __cpu_map_entry_alloc kernel/bpf/cpumap.c:359 [inline]
>>>> cpu_map_update_elem+0x3c3/0x8e0 kernel/bpf/cpumap.c:490
>>>> map_update_elem kernel/bpf/syscall.c:698 [inline]
>>> Blame the BPF people, not the MM people ;-)
> Heh, not really. ;-)
>
>> Yes. kvmalloc (the vmalloc part) doesn't support GFP_ATOMIC semantic.
> Agree, that doesn't work.
>
> Bug was added in commit 0bf7800f1799 ("ptr_ring: try vmalloc() when kmalloc() fails").
>
> Jason, please take a look at fixing this, thanks!

It looks to me the only solution is to revert that commit.

Will post a patch.

Thanks

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