================================================================== BUG: KCSAN: data-race in n_tty_receive_char / n_tty_receive_char write to 0xffffc9000038d018 of 8 bytes by task 27950 on cpu 1: echo_char drivers/tty/n_tty.c:841 [inline] n_tty_receive_char+0x4bd/0x6c0 drivers/tty/n_tty.c:1410 n_tty_receive_buf_standard drivers/tty/n_tty.c:1560 [inline] __receive_buf drivers/tty/n_tty.c:1577 [inline] n_tty_receive_buf_common+0xf2e/0x4e70 drivers/tty/n_tty.c:1674 n_tty_receive_buf+0x2b/0x40 drivers/tty/n_tty.c:1703 tiocsti drivers/tty/tty_io.c:2311 [inline] tty_ioctl+0x968/0x1120 drivers/tty/tty_io.c:2719 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 read to 0xffffc9000038d018 of 8 bytes by task 28364 on cpu 0: commit_echoes drivers/tty/n_tty.c:776 [inline] n_tty_receive_char+0x4eb/0x6c0 drivers/tty/n_tty.c:1411 n_tty_receive_buf_standard drivers/tty/n_tty.c:1560 [inline] __receive_buf drivers/tty/n_tty.c:1577 [inline] n_tty_receive_buf_common+0xf2e/0x4e70 drivers/tty/n_tty.c:1674 n_tty_receive_buf2+0x2e/0x40 drivers/tty/n_tty.c:1709 tty_ldisc_receive_buf+0x5b/0xf0 drivers/tty/tty_buffer.c:471 paste_selection+0x215/0x300 drivers/tty/vt/selection.c:408 tioclinux+0xe5/0x450 drivers/tty/vt/vt.c:3164 vt_ioctl+0x26e/0x2060 drivers/tty/vt/vt_ioctl.c:760 tty_ioctl+0xa24/0x1120 drivers/tty/tty_io.c:2805 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: 0x0000000000000807 -> 0x0000000000000808 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 28364 Comm: syz-executor.1 Tainted: G W 5.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================