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BUG: KCSAN: data-race in __skb_wait_for_more_packets / unix_release_sock

write to 0xffff888155a06e70 of 1 bytes by task 32474 on cpu 1:
 unix_release_sock+0x2bf/0x6f0 net/unix/af_unix.c:565
 unix_release+0x4e/0x70 net/unix/af_unix.c:915
 __sock_release net/socket.c:649 [inline]
 sock_close+0x6c/0x150 net/socket.c:1314
 __fput+0x295/0x520 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 0xffff888155a06e70 of 1 bytes by task 32502 on cpu 0:
 __skb_wait_for_more_packets+0xe7/0x2f0 net/core/datagram.c:106
 __unix_dgram_recvmsg+0x1c8/0x870 net/unix/af_unix.c:2279
 unix_dgram_recvmsg net/unix/af_unix.c:2364 [inline]
 unix_seqpacket_recvmsg+0x5a/0x70 net/unix/af_unix.c:2232
 sock_recvmsg_nosec net/socket.c:944 [inline]
 sock_recvmsg net/socket.c:962 [inline]
 __sys_recvfrom+0x1d7/0x2a0 net/socket.c:2093
 __do_sys_recvfrom net/socket.c:2111 [inline]
 __se_sys_recvfrom net/socket.c:2107 [inline]
 __x64_sys_recvfrom+0x74/0x90 net/socket.c:2107
 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: 0 PID: 32502 Comm: syz-executor.2 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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