==================================================================
BUG: KCSAN: data-race in n_tty_write / tty_set_termios

write to 0xffff8881486d3114 of 4 bytes by task 7011 on cpu 0:
 unset_locked_termios drivers/tty/tty_ioctl.c:233 [inline]
 tty_set_termios+0x1d3/0x8b0 drivers/tty/tty_ioctl.c:355
 set_termios+0x384/0x3c0 drivers/tty/tty_ioctl.c:438
 tty_mode_ioctl+0x5a1/0x690
 n_tty_ioctl_helper+0x83/0x450 drivers/tty/tty_ioctl.c:903
 n_tty_ioctl+0xfc/0x1f0 drivers/tty/n_tty.c:2383
 tty_ioctl+0xaf7/0x1130 drivers/tty/tty_io.c:2787
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:860
 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881486d3114 of 4 bytes by task 7009 on cpu 1:
 n_tty_write+0x87/0xaf0 drivers/tty/n_tty.c:2227
 do_tty_write drivers/tty/tty_io.c:1024 [inline]
 file_tty_write+0x409/0x660 drivers/tty/tty_io.c:1095
 tty_write+0x24/0x30 drivers/tty/tty_io.c:1116
 call_write_iter include/linux/fs.h:2074 [inline]
 do_iter_readv_writev+0x2de/0x380 fs/read_write.c:725
 do_iter_write+0x192/0x5c0 fs/read_write.c:851
 vfs_writev fs/read_write.c:924 [inline]
 do_writev+0x250/0x4d0 fs/read_write.c:967
 __do_sys_writev fs/read_write.c:1040 [inline]
 __se_sys_writev fs/read_write.c:1037 [inline]
 __x64_sys_writev+0x41/0x50 fs/read_write.c:1037
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x00008a3b -> 0x00000006

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7009 Comm: syz-executor.3 Not tainted 5.17.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================