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BUG: KCSAN: data-race in fasync_remove_entry / sock_wake_async

write to 0xffff8881322135d8 of 8 bytes by task 617 on cpu 0:
 fasync_remove_entry+0xd9/0x180 fs/fcntl.c:894
 fasync_helper+0x92/0xc0 fs/fcntl.c:993
 sock_fasync+0x5c/0xc0 net/socket.c:1283
 __fput+0x49f/0x4e0 fs/file_table.c:277
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x151/0x170 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x40/0x50 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881322135d8 of 8 bytes by task 610 on cpu 1:
 sock_wake_async+0x26/0x100 net/socket.c:1298
 sk_wake_async include/net/sock.h:2305 [inline]
 unix_write_space+0x11e/0x130 net/unix/af_unix.c:466
 sock_wfree+0xaf/0x150 net/core/sock.c:2066
 unix_destruct_scm+0x164/0x190 net/unix/scm.c:150
 skb_release_head_state+0xb3/0x170 net/core/skbuff.c:712
 skb_release_all net/core/skbuff.c:723 [inline]
 __kfree_skb+0x14/0x150 net/core/skbuff.c:739
 kfree_skb+0x50/0x130 net/core/skbuff.c:757
 unix_release_sock+0x575/0x6e0 net/unix/af_unix.c:568
 unix_release+0x2f/0x50 net/unix/af_unix.c:859
 __sock_release net/socket.c:599 [inline]
 sock_close+0x6c/0x150 net/socket.c:1258
 __fput+0x25b/0x4e0 fs/file_table.c:280
 ____fput+0x11/0x20 fs/file_table.c:313
 task_work_run+0xae/0x130 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x151/0x170 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:301
 do_syscall_64+0x40/0x50 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 610 Comm: syz-executor.1 Not tainted 5.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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