================================================================== BUG: KCSAN: data-race in ppp_asynctty_receive / tty_set_termios write to 0xffff888116f37522 of 1 bytes by task 10951 on cpu 1: unset_locked_termios drivers/tty/tty_ioctl.c:220 [inline] tty_set_termios+0x4c9/0x8b0 drivers/tty/tty_ioctl.c:340 set_termios+0x497/0x4e0 drivers/tty/tty_ioctl.c:516 tty_mode_ioctl+0x391/0x5d0 ppp_asynctty_ioctl+0x21d/0x2e0 drivers/net/ppp/ppp_async.c:324 tty_ioctl+0x886/0xbe0 drivers/tty/tty_io.c:2812 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:904 [inline] __se_sys_ioctl+0xd3/0x150 fs/ioctl.c:890 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:890 do_syscall_64+0xd3/0x1d0 entry_SYSCALL_64_after_hwframe+0x72/0x7a read to 0xffff888116f37522 of 1 bytes by task 61 on cpu 0: ppp_async_input drivers/net/ppp/ppp_async.c:908 [inline] ppp_asynctty_receive+0x872/0x1050 drivers/net/ppp/ppp_async.c:342 tty_ldisc_receive_buf+0xd9/0x100 drivers/tty/tty_buffer.c:391 tty_port_default_receive_buf+0x59/0x90 drivers/tty/tty_port.c:37 receive_buf drivers/tty/tty_buffer.c:445 [inline] flush_to_ldisc+0x1ce/0x410 drivers/tty/tty_buffer.c:495 process_one_work kernel/workqueue.c:3254 [inline] process_scheduled_works+0x465/0x990 kernel/workqueue.c:3335 worker_thread+0x526/0x730 kernel/workqueue.c:3416 kthread+0x1d1/0x210 kernel/kthread.c:388 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 value changed: 0x13 -> 0x00 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 61 Comm: kworker/u8:5 Tainted: G W 6.9.0-rc3-syzkaller-00011-g20cb38a7af88 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events_unbound flush_to_ldisc ==================================================================