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BUG: KCSAN: data-race in fasync_remove_entry / sock_wake_async

write to 0xffff8881053a8a18 of 8 bytes by task 7755 on cpu 0:
 fasync_remove_entry+0xd2/0x130 fs/fcntl.c:909
 fasync_helper+0x96/0xc0 fs/fcntl.c:1008
 sock_fasync+0x60/0xd0 net/socket.c:1446
 __fput+0x68e/0x6f0 fs/file_table.c:419
 ____fput+0x15/0x20 fs/file_table.c:450
 task_work_run+0x13a/0x1a0 kernel/task_work.c:228
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xbe/0x130 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff8881053a8a18 of 8 bytes by task 7754 on cpu 1:
 sock_wake_async+0x2a/0x120 net/socket.c:1461
 sk_wake_async_rcu include/net/sock.h:2448 [inline]
 unix_write_space+0x135/0x140 net/unix/af_unix.c:618
 sock_wfree+0x11e/0x330 net/core/sock.c:2503
 unix_destruct_scm+0xc5/0xf0 net/unix/af_unix.c:1887
 skb_release_head_state+0xbb/0x1a0 net/core/skbuff.c:1175
 skb_release_all net/core/skbuff.c:1186 [inline]
 __kfree_skb+0x16/0x150 net/core/skbuff.c:1202
 sk_skb_reason_drop+0xb4/0x2c0 net/core/skbuff.c:1240
 kfree_skb_reason include/linux/skbuff.h:1260 [inline]
 kfree_skb include/linux/skbuff.h:1269 [inline]
 unix_release_sock+0x62e/0x770 net/unix/af_unix.c:727
 unix_release+0x57/0x80 net/unix/af_unix.c:1112
 __sock_release net/socket.c:659 [inline]
 sock_close+0x68/0x150 net/socket.c:1421
 __fput+0x192/0x6f0 fs/file_table.c:422
 ____fput+0x15/0x20 fs/file_table.c:450
 task_work_run+0x13a/0x1a0 kernel/task_work.c:228
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0xbe/0x130 kernel/entry/common.c:218
 do_syscall_64+0xd6/0x1c0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff8881041c9cc0 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 7754 Comm: syz.2.1293 Not tainted 6.11.0-rc2-syzkaller-00027-g6a0e38264012 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
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