KCSAN: data-race in do_epoll_ctl / do_epoll

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in do_epoll_ctl / do_epoll_ctl				1	742d	722d	0/24	auto-closed as invalid on 2020/12/25 16:54
upstream	KCSAN: data-race in do_epoll_ctl / do_epoll_ctl (3)				1	113d	113d	0/24	auto-closed as invalid on 2022/09/16 09:55

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BUG: KCSAN: data-race in do_epoll_ctl / do_epoll_ctl

write to 0xffffffff86df1a70 of 8 bytes by task 22591 on cpu 0:
 do_epoll_ctl+0x1786/0x1880 fs/eventpoll.c:2166
 __do_sys_epoll_ctl fs/eventpoll.c:2192 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2183 [inline]
 __x64_sys_epoll_ctl+0xc2/0xf0 fs/eventpoll.c:2183
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff86df1a70 of 8 bytes by task 22593 on cpu 1:
 do_epoll_ctl+0x3ce/0x1880 fs/eventpoll.c:2109
 __do_sys_epoll_ctl fs/eventpoll.c:2192 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2183 [inline]
 __x64_sys_epoll_ctl+0xc2/0xf0 fs/eventpoll.c:2183
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000003 -> 0x0000000000000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22593 Comm: syz-executor.4 Not tainted 5.17.0-rc5-syzkaller-00306-g2293be58d6a1-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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