syzbot

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BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback

write to 0xffff88811ce953e8 of 4 bytes by task 10379 on cpu 1:
 ep_send_events fs/eventpoll.c:1745 [inline]
 ep_poll fs/eventpoll.c:1864 [inline]
 do_epoll_wait+0x805/0xe70 fs/eventpoll.c:2318
 do_epoll_pwait fs/eventpoll.c:2352 [inline]
 __do_sys_epoll_pwait fs/eventpoll.c:2365 [inline]
 __se_sys_epoll_pwait+0x15f/0x280 fs/eventpoll.c:2359
 __x64_sys_epoll_pwait+0x78/0x90 fs/eventpoll.c:2359
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff88811ce953e8 of 4 bytes by task 10377 on cpu 0:
 ep_poll_callback+0x4b5/0x5a0 fs/eventpoll.c:1246
 __wake_up_common kernel/sched/wait.c:89 [inline]
 __wake_up_common_lock kernel/sched/wait.c:106 [inline]
 __wake_up+0x64/0xa0 kernel/sched/wait.c:127
 pipe_release+0x114/0x1c0 fs/pipe.c:739
 __fput+0x299/0x630 fs/file_table.c:394
 __fput_sync+0x44/0x50 fs/file_table.c:475
 __do_sys_close fs/open.c:1590 [inline]
 __se_sys_close+0xfa/0x1a0 fs/open.c:1575
 __x64_sys_close+0x1f/0x30 fs/open.c:1575
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0x40000018 -> 0x40000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 10377 Comm: syz-executor.3 Not tainted 6.7.0-rc2-syzkaller-00265-gd2da77f431ac #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
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