================================================================== BUG: KCSAN: data-race in n_tty_receive_char_special / n_tty_receive_char_special write to 0xffffc90000171018 of 8 bytes by task 183 on cpu 0: add_echo_byte drivers/tty/n_tty.c:842 [inline] echo_char drivers/tty/n_tty.c:945 [inline] eraser drivers/tty/n_tty.c:1040 [inline] n_tty_receive_char_special+0x11d5/0x3ac0 drivers/tty/n_tty.c:1313 n_tty_receive_buf_standard drivers/tty/n_tty.c:1581 [inline] __receive_buf drivers/tty/n_tty.c:1643 [inline] n_tty_receive_buf_common+0x191c/0x1e20 drivers/tty/n_tty.c:1740 n_tty_receive_buf2+0x2e/0x40 drivers/tty/n_tty.c:1775 tty_ldisc_receive_buf+0x5b/0xf0 drivers/tty/tty_buffer.c:461 tty_port_default_receive_buf+0x54/0x80 drivers/tty/tty_port.c:39 receive_buf drivers/tty/tty_buffer.c:481 [inline] flush_to_ldisc+0x1c5/0x2c0 drivers/tty/tty_buffer.c:533 process_one_work+0x3e9/0x8f0 kernel/workqueue.c:2276 worker_thread+0x636/0xae0 kernel/workqueue.c:2422 kthread+0x1d0/0x1f0 kernel/kthread.c:313 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 read to 0xffffc90000171018 of 8 bytes by task 8780 on cpu 1: add_echo_byte drivers/tty/n_tty.c:842 [inline] echo_char drivers/tty/n_tty.c:945 [inline] eraser drivers/tty/n_tty.c:1040 [inline] n_tty_receive_char_special+0x11c6/0x3ac0 drivers/tty/n_tty.c:1313 n_tty_receive_buf_standard drivers/tty/n_tty.c:1581 [inline] __receive_buf drivers/tty/n_tty.c:1643 [inline] n_tty_receive_buf_common+0x191c/0x1e20 drivers/tty/n_tty.c:1740 n_tty_receive_buf+0x2b/0x40 drivers/tty/n_tty.c:1769 tiocsti drivers/tty/tty_io.c:2315 [inline] tty_ioctl+0x968/0x1120 drivers/tty/tty_io.c:2721 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl+0xcb/0x140 fs/ioctl.c:1055 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:1055 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000000000001d5 -> 0x000000000000020b Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8780 Comm: syz-executor.2 Not tainted 5.13.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================