================================================================== BUG: KCSAN: data-race in ppp_asynctty_receive / tty_set_termios write to 0xffff888105399922 of 1 bytes by task 4652 on cpu 0: unset_locked_termios drivers/tty/tty_ioctl.c:238 [inline] tty_set_termios+0x4c8/0x8a0 drivers/tty/tty_ioctl.c:359 set_termios+0x47e/0x4c0 drivers/tty/tty_ioctl.c:534 tty_mode_ioctl+0x3e1/0x580 ppp_asynctty_ioctl+0x21d/0x2e0 drivers/net/ppp/ppp_async.c:324 tty_ioctl+0x86f/0xbc0 drivers/tty/tty_io.c:2786 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xc9/0x140 fs/ioctl.c:856 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff888105399922 of 1 bytes by task 4645 on cpu 1: ppp_async_input drivers/net/ppp/ppp_async.c:913 [inline] ppp_asynctty_receive+0x871/0x1040 drivers/net/ppp/ppp_async.c:349 tty_ldisc_receive_buf+0xbb/0xe0 drivers/tty/tty_buffer.c:461 tty_port_default_receive_buf+0x58/0x80 drivers/tty/tty_port.c:39 receive_buf drivers/tty/tty_buffer.c:515 [inline] flush_to_ldisc+0x1ca/0x400 drivers/tty/tty_buffer.c:565 process_one_work+0x3e6/0x750 kernel/workqueue.c:2405 worker_thread+0x5f2/0xa10 kernel/workqueue.c:2552 kthread+0x1d7/0x210 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 value changed: 0x13 -> 0x95 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 4645 Comm: kworker/u4:7 Not tainted 6.4.0-rc5-syzkaller-00245-g64569520920a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Workqueue: events_unbound flush_to_ldisc ==================================================================