================================================================== BUG: KCSAN: data-race in echo_char / n_tty_receive_buf_common read to 0xffffc90002ca1018 of 8 bytes by task 9648 on cpu 1: flush_echoes drivers/tty/n_tty.c:824 [inline] __receive_buf drivers/tty/n_tty.c:1648 [inline] n_tty_receive_buf_common+0xe04/0x1b00 drivers/tty/n_tty.c:1742 n_tty_receive_buf2+0x3d/0x60 drivers/tty/n_tty.c:1777 tty_ldisc_receive_buf+0x71/0xf0 drivers/tty/tty_buffer.c:461 tty_port_default_receive_buf+0x87/0xd0 drivers/tty/tty_port.c:38 receive_buf drivers/tty/tty_buffer.c:481 [inline] flush_to_ldisc+0x1d5/0x260 drivers/tty/tty_buffer.c:533 process_one_work+0x3d4/0x890 kernel/workqueue.c:2269 worker_thread+0xa0/0x800 kernel/workqueue.c:2415 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352 write to 0xffffc90002ca1018 of 8 bytes by task 9808 on cpu 0: add_echo_byte drivers/tty/n_tty.c:845 [inline] echo_char+0x14e/0x1c0 drivers/tty/n_tty.c:948 n_tty_receive_char_special+0xb5f/0x1c10 drivers/tty/n_tty.c:1339 n_tty_receive_buf_fast drivers/tty/n_tty.c:1610 [inline] __receive_buf drivers/tty/n_tty.c:1644 [inline] n_tty_receive_buf_common+0x1844/0x1b00 drivers/tty/n_tty.c:1742 n_tty_receive_buf+0x3a/0x50 drivers/tty/n_tty.c:1771 tiocsti drivers/tty/tty_io.c:2197 [inline] tty_ioctl+0xb75/0xe10 drivers/tty/tty_io.c:2573 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0x991/0xc60 fs/ioctl.c:696 ksys_ioctl+0xbd/0xe0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x4c/0x60 fs/ioctl.c:718 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 9808 Comm: syz-executor.2 Not tainted 5.4.0-rc6+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================