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BUG: KCSAN: data-race in n_tty_receive_char / n_tty_write

write to 0xffffc9000d889028 of 8 bytes by task 25620 on cpu 0:
 n_tty_receive_char+0x4be/0x670
 n_tty_receive_buf_standard+0x484/0x2d40
 n_tty_receive_buf_common+0x84a/0xb50
 n_tty_receive_buf2+0x32/0x40
 tty_ldisc_receive_buf+0x60/0xe0
 tty_port_default_receive_buf+0x58/0x80
 flush_to_ldisc+0x1ca/0x400
 process_one_work+0x3e6/0x750
 worker_thread+0x5ef/0xa10
 kthread+0x1ac/0x1e0
 ret_from_fork+0x1f/0x30

read to 0xffffc9000d889028 of 8 bytes by task 12775 on cpu 1:
 n_tty_write+0x156/0xa80
 file_tty_write+0x3a0/0x600
 tty_write+0x28/0x30
 vfs_write+0x45a/0x750
 ksys_write+0xeb/0x1a0
 __x64_sys_write+0x42/0x50
 do_syscall_64+0x41/0xc0
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x00000000000000f5 -> 0x00000000000000f8

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 12775 Comm: syz-executor.0 Not tainted 6.2.0-rc7-syzkaller-00002-gd2d11f342b17-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
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