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BUG: KCSAN: data-race in do_epoll_ctl / do_epoll_wait

write to 0xffff88813719f058 of 8 bytes by task 7733 on cpu 1:
 __list_add include/linux/list.h:72 [inline]
 list_add_tail include/linux/list.h:102 [inline]
 ep_insert fs/eventpoll.c:1535 [inline]
 do_epoll_ctl+0x1331/0x1880 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+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88813719f058 of 8 bytes by task 7734 on cpu 0:
 list_empty_careful include/linux/list.h:321 [inline]
 ep_events_available fs/eventpoll.c:374 [inline]
 ep_poll fs/eventpoll.c:1790 [inline]
 do_epoll_wait+0x279/0xf40 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+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0xffff88813719f050 -> 0xffff888137276818

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 7734 Comm: syz-executor.4 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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