==================================================================
BUG: KCSAN: data-race in __skb_wait_for_more_packets / unix_release_sock

write to 0xffff8881edb67e70 of 1 bytes by task 2571 on cpu 0:
 unix_release_sock+0x2bf/0x6f0 net/unix/af_unix.c:557
 unix_release+0x2f/0x50 net/unix/af_unix.c:867
 __sock_release net/socket.c:648 [inline]
 sock_close+0x6c/0x150 net/socket.c:1300
 __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:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x156/0x190 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x20/0x40 kernel/entry/common.c:302
 do_syscall_64+0x49/0x90 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881edb67e70 of 1 bytes by task 2578 on cpu 1:
 __skb_wait_for_more_packets+0xe7/0x2f0 net/core/datagram.c:106
 unix_dgram_recvmsg+0x1d8/0x890 net/unix/af_unix.c:2165
 unix_seqpacket_recvmsg+0x5a/0x70 net/unix/af_unix.c:2118
 sock_recvmsg_nosec net/socket.c:943 [inline]
 sock_recvmsg net/socket.c:961 [inline]
 sock_read_iter+0x19e/0x1e0 net/socket.c:1034
 call_read_iter include/linux/fs.h:2108 [inline]
 generic_file_splice_read+0x22a/0x310 fs/splice.c:311
 sock_splice_read+0xa5/0xb0 net/socket.c:1012
 do_splice_to fs/splice.c:796 [inline]
 splice_file_to_pipe+0x233/0x360 fs/splice.c:1018
 do_splice+0xbc2/0xd30 fs/splice.c:1104
 __do_splice fs/splice.c:1144 [inline]
 __do_sys_splice fs/splice.c:1350 [inline]
 __se_sys_splice+0x2a6/0x390 fs/splice.c:1332
 __x64_sys_splice+0x74/0x80 fs/splice.c:1332
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00 -> 0x03

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2578 Comm: syz-executor.4 Not tainted 5.14.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================