syzbot

==================================================================
BUG: KCSAN: data-race in fasync_remove_entry / sock_wake_async

write to 0xffff88813b1df798 of 8 bytes by task 22620 on cpu 1:
 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+0x5fa/0x660 fs/file_table.c:419
 ____fput+0x15/0x20 fs/file_table.c:450
 task_work_run+0x13a/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: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 0xffff88813b1df798 of 8 bytes by task 22618 on cpu 0:
 sock_wake_async+0x2a/0x120 net/socket.c:1461
 sk_wake_async_rcu include/net/sock.h:2443 [inline]
 unix_write_space+0x135/0x140 net/unix/af_unix.c:543
 sock_wfree+0x11e/0x330 net/core/sock.c:2482
 unix_destruct_scm+0xc5/0xf0 net/unix/af_unix.c:1833
 skb_release_head_state+0xbb/0x1a0 net/core/skbuff.c:1160
 skb_release_all net/core/skbuff.c:1171 [inline]
 __kfree_skb+0x16/0x150 net/core/skbuff.c:1187
 kfree_skb_reason+0xb0/0x2b0 net/core/skbuff.c:1223
 kfree_skb include/linux/skbuff.h:1257 [inline]
 unix_release_sock+0x642/0x790 net/unix/af_unix.c:652
 unix_release+0x57/0x80 net/unix/af_unix.c:1043
 __sock_release net/socket.c:659 [inline]
 sock_close+0x68/0x150 net/socket.c:1421
 __fput+0x2c2/0x660 fs/file_table.c:422
 ____fput+0x15/0x20 fs/file_table.c:450
 task_work_run+0x13a/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: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: 0xffff88810faad270 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 22618 Comm: syz-executor.4 Tainted: G        W          6.10.0-rc4-syzkaller-00283-g563a50672d8a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
==================================================================