================================================================== BUG: KCSAN: data-race in __stop_tty / n_tty_receive_char write to 0xffff8881306d79bc of 1 bytes by task 20502 on cpu 0: __stop_tty+0x42/0x90 drivers/tty/tty_io.c:755 n_tty_ioctl_helper+0x21f/0x240 drivers/tty/tty_ioctl.c:971 n_tty_ioctl+0xfd/0x200 drivers/tty/n_tty.c:2499 tty_ioctl+0x875/0xbc0 drivers/tty/tty_io.c:2795 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xcf/0x140 fs/ioctl.c:856 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff8881306d79bc of 1 bytes by task 18527 on cpu 1: n_tty_receive_char+0x3d/0x670 drivers/tty/n_tty.c:1409 n_tty_receive_buf_standard+0x484/0x2d40 drivers/tty/n_tty.c:1588 __receive_buf drivers/tty/n_tty.c:1612 [inline] n_tty_receive_buf_common+0x84c/0xbd0 drivers/tty/n_tty.c:1710 n_tty_receive_buf2+0x32/0x40 drivers/tty/n_tty.c:1756 tty_ldisc_receive_buf+0x60/0xe0 drivers/tty/tty_buffer.c:457 tty_port_default_receive_buf+0x58/0x80 drivers/tty/tty_port.c:39 receive_buf drivers/tty/tty_buffer.c:515 [inline] flush_to_ldisc+0x1ca/0x400 drivers/tty/tty_buffer.c:565 process_one_work+0x434/0x860 kernel/workqueue.c:2600 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2751 kthread+0x1d7/0x210 kernel/kthread.c:389 ret_from_fork+0x2e/0x40 arch/x86/kernel/process.c:145 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 value changed: 0x00 -> 0x01 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 18527 Comm: kworker/u4:15 Not tainted 6.5.0-rc5-syzkaller-00362-ga785fd28d31f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Workqueue: events_unbound flush_to_ldisc ==================================================================