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BUG: KCSAN: data-race in do_epoll_ctl / do_epoll_ctl

read-write to 0xffffffff86f62b10 of 8 bytes by task 27075 on cpu 0:
 do_epoll_ctl+0x8be/0x920 fs/eventpoll.c:2258
 __do_sys_epoll_ctl fs/eventpoll.c:2284 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2275 [inline]
 __x64_sys_epoll_ctl+0xc6/0xf0 fs/eventpoll.c:2275
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff86f62b10 of 8 bytes by task 27077 on cpu 1:
 do_epoll_ctl+0x4ff/0x920 fs/eventpoll.c:2195
 __do_sys_epoll_ctl fs/eventpoll.c:2284 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2275 [inline]
 __x64_sys_epoll_ctl+0xc6/0xf0 fs/eventpoll.c:2275
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0000000000001055 -> 0x000000000000106c

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 27077 Comm: syz-executor.3 Not tainted 6.4.0-rc6-syzkaller-00242-g1639fae5132b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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