syzbot

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BUG: KCSAN: data-race in free_one_page / prep_compound_page

read to 0xffffea00047c8400 of 8 bytes by task 7144 on cpu 0:
 page_is_buddy mm/page_alloc.c:818 [inline]
 page_is_buddy mm/page_alloc.c:800 [inline]
 __free_one_page mm/page_alloc.c:997 [inline]
 free_one_page+0x3cb/0x840 mm/page_alloc.c:1336
 __free_pages_ok+0x370/0x640 mm/page_alloc.c:1426
 free_compound_page+0x3d/0x50 mm/page_alloc.c:673
 __put_compound_page+0x4e/0x70 mm/swap.c:96
 __put_page+0x54/0xd0 mm/swap.c:112
 put_page include/linux/mm.h:1037 [inline]
 __skb_frag_unref include/linux/skbuff.h:2922 [inline]
 skb_release_data+0x1ba/0x3a0 net/core/skbuff.c:605
 skb_release_all+0x44/0x60 net/core/skbuff.c:665
 __kfree_skb+0x1f/0x30 net/core/skbuff.c:679
 sk_eat_skb include/net/sock.h:2448 [inline]
 tcp_recvmsg+0xf59/0x1a30 net/ipv4/tcp.c:2163
 inet_recvmsg+0xbb/0x250 net/ipv4/af_inet.c:838
 sock_recvmsg_nosec net/socket.c:871 [inline]
 sock_recvmsg net/socket.c:889 [inline]
 sock_recvmsg+0x92/0xb0 net/socket.c:885
 sock_read_iter+0x15f/0x1e0 net/socket.c:967
 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

write to 0xffffea00047c8400 of 8 bytes by interrupt on cpu 1:
 __set_bit include/asm-generic/bitops-instrumented.h:46 [inline]
 __SetPageHead include/linux/page-flags.h:550 [inline]
 prep_compound_page+0x150/0x160 mm/page_alloc.c:683
 prep_new_page+0xfe/0x200 mm/page_alloc.c:2159
 get_page_from_freelist+0x1e9b/0x2300 mm/page_alloc.c:3680
 __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]
 skb_page_frag_refill net/core/sock.c:2364 [inline]
 skb_page_frag_refill+0x16f/0x260 net/core/sock.c:2348
 add_recvbuf_mergeable drivers/net/virtio_net.c:1182 [inline]
 try_fill_recv+0x51f/0xdc0 drivers/net/virtio_net.c:1223
 virtnet_receive drivers/net/virtio_net.c:1335 [inline]
 virtnet_poll+0x64c/0x7d0 drivers/net/virtio_net.c:1428
 napi_poll net/core/dev.c:6352 [inline]
 net_rx_action+0x3ae/0xa50 net/core/dev.c:6418
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 run_ksoftirqd+0x46/0x60 kernel/softirq.c:603
 smpboot_thread_fn+0x37d/0x4a0 kernel/smpboot.c:165
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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