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BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback

write to 0xffff888145fb0668 of 4 bytes by task 23381 on cpu 1:
 ep_send_events fs/eventpoll.c:1744 [inline]
 ep_poll fs/eventpoll.c:1863 [inline]
 do_epoll_wait+0x805/0xe70 fs/eventpoll.c:2317
 do_epoll_pwait fs/eventpoll.c:2351 [inline]
 __do_sys_epoll_pwait fs/eventpoll.c:2364 [inline]
 __se_sys_epoll_pwait+0x15f/0x280 fs/eventpoll.c:2358
 __x64_sys_epoll_pwait+0x78/0x90 fs/eventpoll.c:2358
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff888145fb0668 of 4 bytes by task 23382 on cpu 0:
 ep_poll_callback+0x4b5/0x5a0 fs/eventpoll.c:1245
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock kernel/sched/wait.c:106 [inline]
 __wake_up+0x64/0xa0 kernel/sched/wait.c:127
 do_notify_pidfd kernel/signal.c:2028 [inline]
 do_notify_parent+0x180/0x540 kernel/signal.c:2055
 exit_notify kernel/exit.c:750 [inline]
 do_exit+0xd79/0x16d0 kernel/exit.c:891
 __do_sys_exit kernel/exit.c:987 [inline]
 __se_sys_exit kernel/exit.c:985 [inline]
 __x64_sys_exit+0x1f/0x20 kernel/exit.c:985
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x40000019 -> 0x40000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 23382 Comm: syz-executor.3 Not tainted 6.8.0-rc7-syzkaller-00142-g3aaa8ce7a335 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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