================================================================== BUG: KCSAN: data-race in n_tty_receive_buf_common / n_tty_receive_char_special write to 0xffffc900003b5000 of 8 bytes by task 22 on cpu 0: put_tty_queue drivers/tty/n_tty.c:316 [inline] n_tty_receive_char_fast drivers/tty/n_tty.c:1448 [inline] n_tty_receive_buf_fast drivers/tty/n_tty.c:1606 [inline] __receive_buf drivers/tty/n_tty.c:1641 [inline] n_tty_receive_buf_common+0x1465/0x1e20 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+0x262/0x280 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 read to 0xffffc900003b5000 of 8 bytes by task 19355 on cpu 1: n_tty_receive_char_special+0x3324/0x3ac0 drivers/tty/n_tty.c:1335 n_tty_receive_buf_fast drivers/tty/n_tty.c:1607 [inline] __receive_buf drivers/tty/n_tty.c:1641 [inline] n_tty_receive_buf_common+0xe0c/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_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000fff -> 0x0000000000001000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 19355 Comm: syz-executor.1 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== ================================================================== BUG: KCSAN: data-race in n_tty_receive_buf_common / n_tty_receive_char_special write to 0xffffc900003b5018 of 8 bytes by task 22 on cpu 0: add_echo_byte drivers/tty/n_tty.c:842 [inline] echo_char drivers/tty/n_tty.c:945 [inline] n_tty_receive_char_fast drivers/tty/n_tty.c:1445 [inline] n_tty_receive_buf_fast drivers/tty/n_tty.c:1606 [inline] __receive_buf drivers/tty/n_tty.c:1641 [inline] n_tty_receive_buf_common+0x1320/0x1e20 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+0x262/0x280 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 read to 0xffffc900003b5018 of 8 bytes by task 19355 on cpu 1: echo_char drivers/tty/n_tty.c:841 [inline] n_tty_receive_char_special+0x3302/0x3ac0 drivers/tty/n_tty.c:1336 n_tty_receive_buf_fast drivers/tty/n_tty.c:1607 [inline] __receive_buf drivers/tty/n_tty.c:1641 [inline] n_tty_receive_buf_common+0xe0c/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_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x000000000001c04f -> 0x000000000001c077 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 19355 Comm: syz-executor.1 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================