syzbot

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BUG: KCSAN: data-race in __ep_remove / __fput

write to 0xffff8881042fd4d0 of 8 bytes by task 21157 on cpu 1:
 __ep_remove+0x3b8/0x440 fs/eventpoll.c:743
 ep_remove_safe fs/eventpoll.c:781 [inline]
 ep_clear_and_put+0x158/0x260 fs/eventpoll.c:817
 ep_eventpoll_release+0x32/0x40 fs/eventpoll.c:833
 __fput+0x299/0x630 fs/file_table.c:376
 ____fput+0x15/0x20 fs/file_table.c:404
 task_work_run+0x135/0x1a0 kernel/task_work.c:180
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:108 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0xbd/0x130 kernel/entry/common.c:212
 do_syscall_64+0xda/0x1d0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

read to 0xffff8881042fd4d0 of 8 bytes by task 21156 on cpu 0:
 eventpoll_release include/linux/eventpoll.h:45 [inline]
 __fput+0x217/0x630 fs/file_table.c:367
 __fput_sync+0x44/0x50 fs/file_table.c:461
 __do_sys_close fs/open.c:1554 [inline]
 __se_sys_close+0xfa/0x1a0 fs/open.c:1539
 __x64_sys_close+0x1f/0x30 fs/open.c:1539
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

value changed: 0xffff8881037e36b0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 21156 Comm: syz-executor.1 Not tainted 6.8.0-rc3-syzkaller-00047-g047371968ffc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
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