================================================================== BUG: KCSAN: data-race in n_tty_write / tty_set_termios write to 0xffff888107638114 of 4 bytes by task 20506 on cpu 0: unset_locked_termios drivers/tty/tty_ioctl.c:233 [inline] tty_set_termios+0x1c2/0x8a0 drivers/tty/tty_ioctl.c:355 set_termios+0x375/0x3b0 drivers/tty/tty_ioctl.c:438 tty_mode_ioctl+0x573/0x670 drivers/tty/tty_ioctl.c:749 n_tty_ioctl_helper+0x89/0x4c0 drivers/tty/tty_ioctl.c:907 n_tty_ioctl+0x102/0x200 drivers/tty/n_tty.c:2421 tty_ioctl+0xa8f/0x1120 drivers/tty/tty_io.c:2814 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 0xffff888107638114 of 4 bytes by task 24100 on cpu 1: n_tty_write+0x86/0xaf0 drivers/tty/n_tty.c:2265 do_tty_write drivers/tty/tty_io.c:1038 [inline] file_tty_write+0x409/0x660 drivers/tty/tty_io.c:1110 tty_write+0x24/0x30 drivers/tty/tty_io.c:1131 call_write_iter include/linux/fs.h:2114 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4c0 fs/read_write.c:866 vfs_writev fs/read_write.c:939 [inline] do_writev+0x1e0/0x400 fs/read_write.c:982 __do_sys_writev fs/read_write.c:1055 [inline] __se_sys_writev fs/read_write.c:1052 [inline] __x64_sys_writev+0x41/0x50 fs/read_write.c:1052 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: 0x00000000 -> 0x00008a3b Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 24100 Comm: syz-executor.0 Not tainted 5.14.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================