================================================================== BUG: KCSAN: data-race in do_epoll_ctl / do_epoll_wait write to 0xffff888102895b98 of 8 bytes by task 492 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+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+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888102895b98 of 8 bytes by task 22613 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+0x279/0xf40 fs/eventpoll.c:2227 do_epoll_pwait fs/eventpoll.c:2261 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2274 [inline] __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2268 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2268 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: 0xffff888102895b90 -> 0xffff88810280db18 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 22613 Comm: syz-fuzzer Tainted: G W 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================