BUG: KCSAN: data-race in n_tty_receive_buf_common / n_tty_write write to 0xffffc90001015020 of 8 bytes by task 5734 on cpu 1: process_echoes drivers/tty/n_tty.c:793 [inline] n_tty_write+0x191/0xaf0 drivers/tty/n_tty.c:2236 do_tty_write drivers/tty/tty_io.c:1024 [inline] file_tty_write+0x409/0x660 drivers/tty/tty_io.c:1095 tty_write+0x24/0x30 drivers/tty/tty_io.c:1116 call_write_iter include/linux/fs.h:2074 [inline] new_sync_write fs/read_write.c:503 [inline] vfs_write+0x7f5/0x950 fs/read_write.c:590 ksys_write+0xd9/0x190 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:652 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffffc90001015020 of 8 bytes by task 2332 on cpu 0: flush_echoes drivers/tty/n_tty.c:807 [inline] __receive_buf drivers/tty/n_tty.c:1551 [inline] n_tty_receive_buf_common+0x4bc8/0x4e70 drivers/tty/n_tty.c:1645 n_tty_receive_buf2+0x2e/0x40 drivers/tty/n_tty.c:1680 tty_ldisc_receive_buf+0x5b/0xf0 drivers/tty/tty_buffer.c:451 tty_port_default_receive_buf+0x54/0x80 drivers/tty/tty_port.c:39 receive_buf drivers/tty/tty_buffer.c:471 [inline] flush_to_ldisc+0x1c5/0x300 drivers/tty/tty_buffer.c:521 process_one_work+0x3f6/0x960 kernel/workqueue.c:2307 worker_thread+0x616/0xa70 kernel/workqueue.c:2454 kthread+0x1bf/0x1e0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 value changed: 0x000000000000000e -> 0x0000000000000014 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 2332 Comm: kworker/u4:1 Not tainted 5.17.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound flush_to_ldisc ==================================================================