================================================================== BUG: KCSAN: data-race in n_tty_receive_char_inline / n_tty_receive_char_inline write to 0xffffc90001031000 of 8 bytes by task 13665 on cpu 1: put_tty_queue drivers/tty/n_tty.c:320 [inline] n_tty_receive_char_inline+0x630/0x650 drivers/tty/n_tty.c:1427 n_tty_receive_buf_standard drivers/tty/n_tty.c:1584 [inline] __receive_buf drivers/tty/n_tty.c:1647 [inline] n_tty_receive_buf_common+0x1892/0x1df0 drivers/tty/n_tty.c:1744 n_tty_receive_buf+0x2b/0x40 drivers/tty/n_tty.c:1773 tiocsti drivers/tty/tty_io.c:2203 [inline] tty_ioctl+0x928/0x1030 drivers/tty/tty_io.c:2577 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:739 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:739 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffffc90001031000 of 8 bytes by task 38 on cpu 0: put_tty_queue drivers/tty/n_tty.c:319 [inline] n_tty_receive_char_inline+0x60a/0x650 drivers/tty/n_tty.c:1427 n_tty_receive_buf_standard drivers/tty/n_tty.c:1584 [inline] __receive_buf drivers/tty/n_tty.c:1647 [inline] n_tty_receive_buf_common+0x1892/0x1df0 drivers/tty/n_tty.c:1744 n_tty_receive_buf2+0x2e/0x40 drivers/tty/n_tty.c:1779 tty_ldisc_receive_buf+0x61/0xf0 drivers/tty/tty_buffer.c:461 tty_port_default_receive_buf+0x54/0x80 drivers/tty/tty_port.c:38 receive_buf drivers/tty/tty_buffer.c:481 [inline] flush_to_ldisc+0x1c5/0x2b0 drivers/tty/tty_buffer.c:533 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275 worker_thread+0x64a/0xaa0 kernel/workqueue.c:2421 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 38 Comm: kworker/u4:2 Not tainted 5.11.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound flush_to_ldisc ==================================================================