================================================================== BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback write to 0xffff88812536a4d0 of 8 bytes by interrupt on cpu 1: list_add_tail_lockless fs/eventpoll.c:1158 [inline] ep_poll_callback+0x29c/0x510 fs/eventpoll.c:1248 __wake_up_common+0xbc/0x130 kernel/sched/wait.c:93 __wake_up_common_lock kernel/sched/wait.c:123 [inline] __wake_up_sync_key+0x83/0xc0 kernel/sched/wait.c:190 sock_def_readable+0x61/0xe0 net/core/sock.c:2909 tcp_data_ready net/ipv4/tcp_input.c:4796 [inline] tcp_rcv_established+0x13c0/0x1520 net/ipv4/tcp_input.c:5725 tcp_v4_do_rcv+0x25e/0x480 net/ipv4/tcp_ipv4.c:1641 tcp_v4_rcv+0x219b/0x2420 net/ipv4/tcp_ipv4.c:2023 ip_protocol_deliver_rcu+0x1f9/0x400 net/ipv4/ip_input.c:204 ip_local_deliver_finish net/ipv4/ip_input.c:231 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ip_local_deliver+0x1d6/0x2a0 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:449 [inline] ip_sublist_rcv_finish net/ipv4/ip_input.c:550 [inline] ip_list_rcv_finish net/ipv4/ip_input.c:600 [inline] ip_sublist_rcv+0x4d4/0x5a0 net/ipv4/ip_input.c:608 ip_list_rcv+0x262/0x290 net/ipv4/ip_input.c:643 __netif_receive_skb_list_ptype net/core/dev.c:5324 [inline] __netif_receive_skb_list_core+0x34b/0x450 net/core/dev.c:5372 __netif_receive_skb_list+0x298/0x310 net/core/dev.c:5424 netif_receive_skb_list_internal+0xda/0x330 net/core/dev.c:5531 gro_normal_list net/core/dev.c:5642 [inline] gro_normal_one net/core/dev.c:5654 [inline] napi_skb_finish net/core/dev.c:5982 [inline] napi_gro_receive+0x329/0x5a0 net/core/dev.c:6014 receive_buf+0x7a4/0xcf0 drivers/net/virtio_net.c:1082 virtnet_receive drivers/net/virtio_net.c:1346 [inline] virtnet_poll+0x2fa/0x780 drivers/net/virtio_net.c:1451 napi_poll+0x178/0x4a0 net/core/dev.c:6684 net_rx_action+0x1ba/0x530 net/core/dev.c:6752 __do_softirq+0x198/0x360 kernel/softirq.c:292 run_ksoftirqd+0x2f/0x60 kernel/softirq.c:630 smpboot_thread_fn+0x347/0x530 kernel/smpboot.c:165 kthread+0x20d/0x230 kernel/kthread.c:291 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293 read to 0xffff88812536a4d0 of 8 bytes by task 8644 on cpu 0: list_empty_careful include/linux/list.h:300 [inline] ep_events_available fs/eventpoll.c:379 [inline] ep_poll fs/eventpoll.c:1855 [inline] do_epoll_wait+0x2e2/0x870 fs/eventpoll.c:2333 __do_sys_epoll_pwait fs/eventpoll.c:2364 [inline] __se_sys_epoll_pwait fs/eventpoll.c:2350 [inline] __x64_sys_epoll_pwait+0x92/0x150 fs/eventpoll.c:2350 do_syscall_64+0x51/0xb0 arch/x86/entry/common.c:384 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 8644 Comm: syz-fuzzer Not tainted 5.8.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================