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BUG: KCSAN: data-race in unix_notinflight / wait_for_unix_gc

write to 0xffffffff841b9d54 of 4 bytes by task 13270 on cpu 1:
 unix_notinflight+0x1f2/0x280 net/unix/scm.c:83
 unix_detach_fds+0xf3/0x120 net/unix/scm.c:134
 unix_dgram_recvmsg+0x66a/0x870 net/unix/af_unix.c:2158
 sock_recvmsg_nosec net/socket.c:943 [inline]
 sock_recvmsg net/socket.c:961 [inline]
 __sys_recvfrom+0x1d7/0x2a0 net/socket.c:2076
 __do_sys_recvfrom net/socket.c:2094 [inline]
 __se_sys_recvfrom net/socket.c:2090 [inline]
 __x64_sys_recvfrom+0x74/0x90 net/socket.c:2090
 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

read to 0xffffffff841b9d54 of 4 bytes by task 13268 on cpu 0:
 wait_for_unix_gc+0x24/0x140 net/unix/garbage.c:196
 unix_dgram_sendmsg+0x5f/0x1600 net/unix/af_unix.c:1637
 sock_sendmsg_nosec net/socket.c:703 [inline]
 sock_sendmsg net/socket.c:723 [inline]
 ____sys_sendmsg+0x360/0x4d0 net/socket.c:2392
 ___sys_sendmsg net/socket.c:2446 [inline]
 __sys_sendmmsg+0x315/0x4b0 net/socket.c:2532
 __do_sys_sendmmsg net/socket.c:2561 [inline]
 __se_sys_sendmmsg net/socket.c:2558 [inline]
 __x64_sys_sendmmsg+0x53/0x60 net/socket.c:2558
 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: 0x0000000e -> 0x0000000d

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 13268 Comm: syz-executor.1 Not tainted 5.14.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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