================================================================== BUG: KCSAN: data-race in ep_poll / ep_poll_callback write to 0xffff8881232b8650 of 8 bytes by interrupt on cpu 0: list_add_tail_lockless fs/eventpoll.c:1163 [inline] ep_poll_callback+0x5e7/0x6a0 fs/eventpoll.c:1253 __wake_up_common+0x7b/0x180 kernel/sched/wait.c:93 __wake_up_common_lock+0x77/0xb0 kernel/sched/wait.c:123 __wake_up_sync_key+0x19/0x20 kernel/sched/wait.c:196 sock_def_readable+0xa9/0x140 net/core/sock.c:2786 tcp_data_ready+0x7d/0xd0 net/ipv4/tcp_input.c:4706 tcp_rcv_established+0xd0c/0xf50 net/ipv4/tcp_input.c:5632 tcp_v4_do_rcv+0x381/0x4e0 net/ipv4/tcp_ipv4.c:1542 tcp_v4_rcv+0x1a03/0x1bf0 net/ipv4/tcp_ipv4.c:1923 ip_protocol_deliver_rcu+0x51/0x470 net/ipv4/ip_input.c:204 ip_local_deliver_finish+0x110/0x140 net/ipv4/ip_input.c:231 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip_local_deliver+0x133/0x210 net/ipv4/ip_input.c:252 dst_input include/net/dst.h:442 [inline] ip_rcv_finish+0x121/0x160 net/ipv4/ip_input.c:413 NF_HOOK include/linux/netfilter.h:305 [inline] NF_HOOK include/linux/netfilter.h:299 [inline] ip_rcv+0x18f/0x1a0 net/ipv4/ip_input.c:523 read to 0xffff8881232b8650 of 8 bytes by task 7284 on cpu 1: list_empty_careful include/linux/list.h:286 [inline] ep_events_available fs/eventpoll.c:380 [inline] ep_poll+0x98/0x900 fs/eventpoll.c:1861 do_epoll_wait+0x162/0x180 fs/eventpoll.c:2294 __do_sys_epoll_pwait fs/eventpoll.c:2325 [inline] __se_sys_epoll_pwait fs/eventpoll.c:2311 [inline] __x64_sys_epoll_pwait+0xcd/0x170 fs/eventpoll.c:2311 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 7284 Comm: syz-fuzzer Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================