==================================================================
BUG: KCSAN: data-race in do_epoll_ctl / do_epoll_wait

write to 0xffff888107d0d4d8 of 8 bytes by task 22306 on cpu 0:
 __list_add include/linux/list.h:70 [inline]
 list_add_tail include/linux/list.h:100 [inline]
 ep_insert fs/eventpoll.c:1535 [inline]
 do_epoll_ctl+0x139d/0x1920 fs/eventpoll.c:2134
 __do_sys_epoll_ctl fs/eventpoll.c:2185 [inline]
 __se_sys_epoll_ctl fs/eventpoll.c:2176 [inline]
 __x64_sys_epoll_ctl+0xc2/0xf0 fs/eventpoll.c:2176
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff888107d0d4d8 of 8 bytes by task 22296 on cpu 1:
 list_empty_careful include/linux/list.h:319 [inline]
 ep_events_available fs/eventpoll.c:374 [inline]
 ep_poll fs/eventpoll.c:1790 [inline]
 do_epoll_wait+0x26e/0xf10 fs/eventpoll.c:2227
 __do_sys_epoll_wait fs/eventpoll.c:2239 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2234 [inline]
 __x64_sys_epoll_wait+0x119/0x140 fs/eventpoll.c:2234
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff888107d0d4d0 -> 0xffff88813515e898

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22296 Comm: syz-executor.2 Not tainted 5.15.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================