================================================================== BUG: KCSAN: data-race in do_epoll_wait / do_epoll_wait write to 0xffff8881047ae598 of 8 bytes by task 1777 on cpu 0: INIT_LIST_HEAD include/linux/list.h:36 [inline] list_splice_init include/linux/list.h:483 [inline] ep_start_scan fs/eventpoll.c:615 [inline] ep_send_events fs/eventpoll.c:1647 [inline] ep_poll fs/eventpoll.c:1798 [inline] do_epoll_wait+0x4e7/0xf10 fs/eventpoll.c:2226 do_epoll_pwait fs/eventpoll.c:2260 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2273 [inline] __se_sys_epoll_pwait+0xfb/0x210 fs/eventpoll.c:2267 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2267 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881047ae598 of 8 bytes by task 1773 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:1789 [inline] do_epoll_wait+0x292/0xf10 fs/eventpoll.c:2226 do_epoll_pwait fs/eventpoll.c:2260 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2273 [inline] __se_sys_epoll_pwait+0xfb/0x210 fs/eventpoll.c:2267 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2267 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0xffff8881047ae590 -> 0xffff888100e1ed98 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1773 Comm: syz-fuzzer Tainted: G W 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================