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BUG: KCSAN: data-race in unix_inflight / wait_for_unix_gc

write to 0xffffffff8419f114 of 4 bytes by task 1655 on cpu 0:
 unix_inflight+0x1e8/0x280 net/unix/scm.c:63
 unix_attach_fds+0x10c/0x1e0 net/unix/scm.c:121
 unix_scm_to_skb net/unix/af_unix.c:1637 [inline]
 unix_stream_sendmsg+0x51a/0xfb0 net/unix/af_unix.c:2034
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 ____sys_sendmsg+0x39a/0x510 net/socket.c:2409
 ___sys_sendmsg net/socket.c:2463 [inline]
 __sys_sendmsg+0x242/0x2c0 net/socket.c:2492
 __do_sys_sendmsg net/socket.c:2501 [inline]
 __se_sys_sendmsg net/socket.c:2499 [inline]
 __x64_sys_sendmsg+0x42/0x50 net/socket.c:2499
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffffffff8419f114 of 4 bytes by task 1654 on cpu 1:
 wait_for_unix_gc+0x24/0x160 net/unix/garbage.c:196
 unix_dgram_sendmsg+0x8e/0x1650 net/unix/af_unix.c:1735
 unix_seqpacket_sendmsg+0xcc/0x110 net/unix/af_unix.c:2221
 sock_sendmsg_nosec net/socket.c:704 [inline]
 sock_sendmsg net/socket.c:724 [inline]
 ____sys_sendmsg+0x39a/0x510 net/socket.c:2409
 __sys_sendmsg_sock+0x25/0x30 net/socket.c:2475
 io_sendmsg fs/io_uring.c:4727 [inline]
 io_issue_sqe+0x21b3/0x6590 fs/io_uring.c:6621
 __io_queue_sqe+0x34/0x460 fs/io_uring.c:6907
 io_queue_sqe fs/io_uring.c:6958 [inline]
 io_submit_sqe+0x88b/0x3e80 fs/io_uring.c:7134
 io_submit_sqes+0x505/0xde0 fs/io_uring.c:7240
 __do_sys_io_uring_enter fs/io_uring.c:9882 [inline]
 __se_sys_io_uring_enter+0x20d/0xb30 fs/io_uring.c:9824
 __x64_sys_io_uring_enter+0x74/0x80 fs/io_uring.c:9824
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00000000 -> 0x00000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 1654 Comm: syz-executor.4 Tainted: G        W         5.15.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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