================================================================== BUG: KCSAN: data-race in __stop_tty / pty_write write to 0xffff888164170dbc of 1 bytes by task 29597 on cpu 1: __stop_tty+0x42/0x90 drivers/tty/tty_io.c:753 n_tty_ioctl_helper+0x21f/0x240 drivers/tty/tty_ioctl.c:961 n_tty_ioctl+0xfd/0x200 drivers/tty/n_tty.c:2516 tty_ioctl+0x875/0xbc0 drivers/tty/tty_io.c:2785 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xcf/0x140 fs/ioctl.c:857 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:857 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 0xffff888164170dbc of 1 bytes by task 7345 on cpu 0: pty_write+0x26/0xa0 drivers/tty/pty.c:115 tty_put_char+0x83/0xb0 drivers/tty/tty_io.c:3141 n_tty_process_echo_ops drivers/tty/n_tty.c:669 [inline] __process_echoes+0x3a3/0x6a0 drivers/tty/n_tty.c:714 flush_echoes drivers/tty/n_tty.c:812 [inline] __receive_buf drivers/tty/n_tty.c:1637 [inline] n_tty_receive_buf_common+0x8e6/0xbc0 drivers/tty/n_tty.c:1734 n_tty_receive_buf2+0x33/0x40 drivers/tty/n_tty.c:1780 tty_ldisc_receive_buf+0x60/0xe0 drivers/tty/tty_buffer.c:387 tty_port_default_receive_buf+0x59/0x90 drivers/tty/tty_port.c:37 receive_buf drivers/tty/tty_buffer.c:445 [inline] flush_to_ldisc+0x1ca/0x400 drivers/tty/tty_buffer.c:495 process_one_work kernel/workqueue.c:2630 [inline] process_scheduled_works+0x5b8/0xa30 kernel/workqueue.c:2703 worker_thread+0x525/0x730 kernel/workqueue.c:2784 kthread+0x1d7/0x210 kernel/kthread.c:388 ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 value changed: 0x00 -> 0x01 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 7345 Comm: kworker/u4:8 Not tainted 6.6.0-rc6-syzkaller-00045-g7cf4bea77ab6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Workqueue: events_unbound flush_to_ldisc ==================================================================