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BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback

write to 0xffff888104c9f868 of 4 bytes by task 28802 on cpu 1:
 do_epoll_wait+0x86c/0xe90
 __se_sys_epoll_pwait+0x15f/0x280
 __x64_sys_epoll_pwait+0x78/0x90
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888104c9f868 of 4 bytes by task 28812 on cpu 0:
 ep_poll_callback+0x44e/0x530
 __wake_up_common+0xb3/0x130
 __wake_up_sync_key+0x82/0xc0
 unix_write_space+0xcd/0x140
 sock_wfree+0x119/0x330
 unix_destruct_scm+0x137/0x160
 skb_release_head_state+0xb7/0x1a0
 kfree_skb_reason+0xa6/0x3b0
 unix_release_sock+0x63d/0x780
 unix_release+0x52/0x70
 sock_close+0x70/0x150
 __fput+0x245/0x570
 ____fput+0x15/0x20
 task_work_run+0x123/0x160
 exit_to_user_mode_loop+0xcf/0xe0
 exit_to_user_mode_prepare+0x6a/0xa0
 syscall_exit_to_user_mode+0x26/0x140
 do_syscall_64+0x4d/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x6000001c -> 0x60000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 28812 Comm: syz-executor.5 Tainted: G        W          6.2.0-rc6-syzkaller-00258-gdb27c22251e7-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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