================================================================== BUG: KCSAN: data-race in ep_poll / ep_poll_callback write to 0xffff888121bb8710 of 8 bytes by interrupt on cpu 1: list_add_tail_lockless fs/eventpoll.c:1158 [inline] ep_poll_callback+0x5f2/0x6c0 fs/eventpoll.c:1248 __wake_up_common+0x76/0x180 kernel/sched/wait.c:93 __wake_up_common_lock+0x77/0xb0 kernel/sched/wait.c:123 sock_def_readable+0x9d/0x130 net/core/sock.c:2819 tcp_data_ready+0x76/0xc0 net/ipv4/tcp_input.c:4767 tcp_rcv_established+0xcb8/0xee0 net/ipv4/tcp_input.c:5698 tcp_v4_do_rcv+0x396/0x4f0 net/ipv4/tcp_ipv4.c:1621 tcp_v4_rcv+0x1c55/0x1e10 net/ipv4/tcp_ipv4.c:2003 ip_protocol_deliver_rcu+0x4b/0x410 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0xf3/0x120 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip_local_deliver+0x135/0x220 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:441 [inline] ip_sublist_rcv_finish+0xf0/0x140 net/ipv4/ip_input.c:550 ip_list_rcv_finish net/ipv4/ip_input.c:600 [inline] ip_sublist_rcv+0x3f8/0x530 net/ipv4/ip_input.c:608 ip_list_rcv+0x2f3/0x321 net/ipv4/ip_input.c:643 __netif_receive_skb_list_ptype net/core/dev.c:5230 [inline] __netif_receive_skb_list_ptype net/core/dev.c:5219 [inline] __netif_receive_skb_list_core+0x368/0x5c0 net/core/dev.c:5278 __netif_receive_skb_list net/core/dev.c:5330 [inline] netif_receive_skb_list_internal+0x5c7/0x810 net/core/dev.c:5425 gro_normal_list.part.0+0x37/0xa0 net/core/dev.c:5536 gro_normal_list net/core/dev.c:5549 [inline] gro_normal_one+0x14c/0x160 net/core/dev.c:5548 napi_skb_finish net/core/dev.c:5876 [inline] napi_gro_receive+0x27d/0x2f0 net/core/dev.c:5908 receive_buf+0x24c/0x3420 drivers/net/virtio_net.c:1073 virtnet_receive drivers/net/virtio_net.c:1335 [inline] virtnet_poll+0x343/0x790 drivers/net/virtio_net.c:1440 napi_poll net/core/dev.c:6571 [inline] net_rx_action+0x3ad/0xac0 net/core/dev.c:6639 __do_softirq+0x118/0x34a kernel/softirq.c:292 run_ksoftirqd+0x41/0x60 kernel/softirq.c:604 smpboot_thread_fn+0x374/0x4a0 kernel/smpboot.c:165 kthread+0x203/0x230 kernel/kthread.c:268 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 read to 0xffff888121bb8710 of 8 bytes by task 8918 on cpu 0: list_empty_careful include/linux/list.h:300 [inline] ep_events_available fs/eventpoll.c:379 [inline] ep_poll+0x5ad/0x910 fs/eventpoll.c:1902 do_epoll_wait+0x15a/0x180 fs/eventpoll.c:2320 __do_sys_epoll_pwait fs/eventpoll.c:2351 [inline] __se_sys_epoll_pwait fs/eventpoll.c:2337 [inline] __x64_sys_epoll_pwait+0xc6/0x170 fs/eventpoll.c:2337 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 8918 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================