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BUG: KCSAN: data-race in do_epoll_ctl / do_epoll_ctl

read-write to 0xffffffff883d72c0 of 8 bytes by task 15441 on cpu 1:
 do_epoll_ctl+0x6f6/0x950 fs/eventpoll.c:2303
 __do_sys_epoll_ctl fs/eventpoll.c:2386 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2377 [inline]
 __x64_sys_epoll_ctl+0xc6/0xf0 fs/eventpoll.c:2377
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

read to 0xffffffff883d72c0 of 8 bytes by task 15443 on cpu 0:
 do_epoll_ctl+0x529/0x950 fs/eventpoll.c:2297
 __do_sys_epoll_ctl fs/eventpoll.c:2386 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2377 [inline]
 __x64_sys_epoll_ctl+0xc6/0xf0 fs/eventpoll.c:2377
 do_syscall_64+0xd3/0x1d0
 entry_SYSCALL_64_after_hwframe+0x6d/0x75

value changed: 0x000000000000000a -> 0x000000000000000c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15443 Comm: syz-executor.2 Tainted: G        W          6.8.0-syzkaller-11409-gf6cef5f8c37f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/29/2024
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