================================================================== BUG: KCSAN: data-race in n_tty_receive_char_inline / n_tty_receive_char_inline write to 0xffffc90004811000 of 8 bytes by task 11303 on cpu 1: put_tty_queue drivers/tty/n_tty.c:320 [inline] n_tty_receive_char_inline+0x66c/0x680 drivers/tty/n_tty.c:1426 n_tty_receive_buf_standard drivers/tty/n_tty.c:1583 [inline] __receive_buf drivers/tty/n_tty.c:1646 [inline] n_tty_receive_buf_common+0x18fa/0x1e70 drivers/tty/n_tty.c:1742 n_tty_receive_buf+0x2b/0x40 drivers/tty/n_tty.c:1771 tiocsti drivers/tty/tty_io.c:2196 [inline] tty_ioctl+0x8e3/0xfd0 drivers/tty/tty_io.c:2572 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 0xffffc90004811000 of 8 bytes by task 3428 on cpu 0: put_tty_queue drivers/tty/n_tty.c:319 [inline] n_tty_receive_char_inline+0x646/0x680 drivers/tty/n_tty.c:1426 n_tty_receive_buf_standard drivers/tty/n_tty.c:1583 [inline] __receive_buf drivers/tty/n_tty.c:1646 [inline] n_tty_receive_buf_common+0x18fa/0x1e70 drivers/tty/n_tty.c:1742 n_tty_receive_buf2+0x2e/0x40 drivers/tty/n_tty.c:1777 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+0x1b5/0x2b0 drivers/tty/tty_buffer.c:533 process_one_work+0x3e1/0x9a0 kernel/workqueue.c:2269 worker_thread+0x665/0xbe0 kernel/workqueue.c:2415 kthread+0x20d/0x230 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 3428 Comm: kworker/u4:4 Not tainted 5.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound flush_to_ldisc ==================================================================