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BUG: KCSAN: data-race in __zone_watermark_ok / get_page_from_freelist

read to 0xffff88812fffce88 of 8 bytes by task 7310 on cpu 0:
 __zone_watermark_ok+0x106/0x240 mm/page_alloc.c:3444
 zone_watermark_fast mm/page_alloc.c:3494 [inline]
 get_page_from_freelist+0x629/0x2300 mm/page_alloc.c:3635
 __alloc_pages_nodemask+0x255/0x4d0 mm/page_alloc.c:4714
 __alloc_pages include/linux/gfp.h:473 [inline]
 __alloc_pages_node include/linux/gfp.h:486 [inline]
 kmem_getpages mm/slab.c:1366 [inline]
 cache_grow_begin+0x76/0x670 mm/slab.c:2599
 cache_alloc_refill mm/slab.c:2971 [inline]
 ____cache_alloc mm/slab.c:3054 [inline]
 ____cache_alloc mm/slab.c:3037 [inline]
 __do_cache_alloc mm/slab.c:3276 [inline]
 slab_alloc mm/slab.c:3311 [inline]
 __do_kmalloc mm/slab.c:3653 [inline]
 __kmalloc+0x59c/0x690 mm/slab.c:3664
 kmalloc_array include/linux/slab.h:676 [inline]
 batadv_hash_new+0x78/0x1e0 net/batman-adv/hash.c:52
 batadv_dat_init+0x5f/0xc0 net/batman-adv/distributed-arp-table.c:813
 batadv_mesh_init+0x3df/0x4b0 net/batman-adv/main.c:216
 batadv_softif_init_late+0x53c/0x5c0 net/batman-adv/soft-interface.c:857
 register_netdevice+0x14c/0xa50 net/core/dev.c:8658
 __rtnl_newlink+0xf9d/0x1010 net/core/rtnetlink.c:3208
 rtnl_newlink+0x63/0x90 net/core/rtnetlink.c:3254
 rtnetlink_rcv_msg+0x1d3/0x500 net/core/rtnetlink.c:5223
 netlink_rcv_skb+0xb0/0x260 net/netlink/af_netlink.c:2477

write to 0xffff88812fffce88 of 8 bytes by task 7308 on cpu 1:
 del_page_from_free_area include/linux/mmzone.h:151 [inline]
 __rmqueue_smallest mm/page_alloc.c:2191 [inline]
 __rmqueue mm/page_alloc.c:2711 [inline]
 rmqueue_bulk mm/page_alloc.c:2738 [inline]
 __rmqueue_pcplist mm/page_alloc.c:3209 [inline]
 rmqueue_pcplist mm/page_alloc.c:3237 [inline]
 rmqueue mm/page_alloc.c:3259 [inline]
 get_page_from_freelist+0x1217/0x2300 mm/page_alloc.c:3677
 __alloc_pages_nodemask+0x255/0x4d0 mm/page_alloc.c:4714
 alloc_pages_current+0xd1/0x170 mm/mempolicy.c:2153
 alloc_pages include/linux/gfp.h:509 [inline]
 __page_cache_alloc mm/filemap.c:972 [inline]
 __page_cache_alloc+0x183/0x1a0 mm/filemap.c:957
 __do_page_cache_readahead+0x13e/0x390 mm/readahead.c:196
 ra_submit mm/internal.h:62 [inline]
 ondemand_readahead+0x35d/0x710 mm/readahead.c:492
 page_cache_async_readahead+0x22c/0x250 mm/readahead.c:574
 generic_file_buffered_read mm/filemap.c:2079 [inline]
 generic_file_read_iter+0xffc/0x1440 mm/filemap.c:2344
 ext4_file_read_iter fs/ext4/file.c:77 [inline]
 ext4_file_read_iter+0xfa/0x240 fs/ext4/file.c:65
 call_read_iter include/linux/fs.h:1864 [inline]
 new_sync_read+0x389/0x4f0 fs/read_write.c:414
 __vfs_read+0xb1/0xc0 fs/read_write.c:427
 integrity_kernel_read+0xa1/0xe0 security/integrity/iint.c:200
 ima_calc_file_hash_tfm+0x1b5/0x260 security/integrity/ima/ima_crypto.c:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7308 Comm: syz-fuzzer Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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