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 ;-)
Yes. kvmalloc (the vmalloc part) doesn't support GFP_ATOMIC semantic. -- Michal Hocko SUSE Labs
