================================================================== BUG: KCSAN: data-race in n_tty_flush_buffer / n_tty_lookahead_flow_ctrl write to 0xffffc900017bd270 of 8 bytes by task 16915 on cpu 1: reset_buffer_flags drivers/tty/n_tty.c:322 [inline] n_tty_flush_buffer+0xa8/0x180 drivers/tty/n_tty.c:353 tty_ldisc_hangup+0x77/0x370 drivers/tty/tty_ldisc.c:699 __tty_hangup+0x395/0x510 drivers/tty/tty_io.c:621 tty_vhangup drivers/tty/tty_io.c:691 [inline] tty_ioctl+0x601/0xb80 drivers/tty/tty_io.c:2732 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xce/0x140 fs/ioctl.c:893 __x64_sys_ioctl+0x43/0x50 fs/ioctl.c:893 x64_sys_call+0x19a8/0x2fb0 arch/x86/include/generated/asm/syscalls_64.h:17 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f read-write to 0xffffc900017bd270 of 8 bytes by task 6273 on cpu 0: n_tty_lookahead_flow_ctrl+0x48/0x130 drivers/tty/n_tty.c:1491 tty_port_default_lookahead_buf+0x8e/0xc0 drivers/tty/tty_port.c:59 lookahead_bufs drivers/tty/tty_buffer.c:428 [inline] flush_to_ldisc+0x281/0x360 drivers/tty/tty_buffer.c:498 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0x4cb/0x9d0 kernel/workqueue.c:3321 worker_thread+0x582/0x770 kernel/workqueue.c:3402 kthread+0x489/0x510 kernel/kthread.c:464 ret_from_fork+0xda/0x150 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 value changed: 0x0000000000002983 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 0 UID: 0 PID: 6273 Comm: kworker/u8:40 Not tainted 6.16.0-rc5-syzkaller-00121-gbc9ff192a6c9 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_unbound flush_to_ldisc ==================================================================