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BUG: KCSAN: data-race in do_epoll_ctl / do_epoll_ctl

read-write to 0xffffffff870cfc30 of 8 bytes by task 15272 on cpu 1:
 do_epoll_ctl+0x641/0x890 fs/eventpoll.c:2137
 __do_sys_epoll_ctl fs/eventpoll.c:2214 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2205 [inline]
 __x64_sys_epoll_ctl+0xc2/0xf0 fs/eventpoll.c:2205
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffffffff870cfc30 of 8 bytes by task 15276 on cpu 0:
 do_epoll_ctl+0x4ab/0x890 fs/eventpoll.c:2131
 __do_sys_epoll_ctl fs/eventpoll.c:2214 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2205 [inline]
 __x64_sys_epoll_ctl+0xc2/0xf0 fs/eventpoll.c:2205
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x000000000000005a -> 0x000000000000005c

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 15276 Comm: syz-executor.2 Not tainted 5.19.0-syzkaller-13930-g7ebfc85e2cd7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
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