================================================================== BUG: KCSAN: data-race in n_tty_receive_buf_common / n_tty_write write to 0xffffc90001265020 of 8 bytes by task 30212 on cpu 1: process_echoes drivers/tty/n_tty.c:793 [inline] n_tty_write+0x198/0xb40 drivers/tty/n_tty.c:2234 do_tty_write drivers/tty/tty_io.c:1024 [inline] file_tty_write+0x3f9/0x650 drivers/tty/tty_io.c:1095 tty_write+0x24/0x30 drivers/tty/tty_io.c:1116 call_write_iter include/linux/fs.h:2060 [inline] new_sync_write fs/read_write.c:504 [inline] vfs_write+0x71c/0x890 fs/read_write.c:591 ksys_write+0xe8/0x1a0 fs/read_write.c:644 __do_sys_write fs/read_write.c:656 [inline] __se_sys_write fs/read_write.c:653 [inline] __x64_sys_write+0x3e/0x50 fs/read_write.c:653 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 read to 0xffffc90001265020 of 8 bytes by task 30151 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+0x499b/0x4c40 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:452 tty_port_default_receive_buf+0x54/0x80 drivers/tty/tty_port.c:39 receive_buf drivers/tty/tty_buffer.c:472 [inline] flush_to_ldisc+0x1ca/0x2f0 drivers/tty/tty_buffer.c:522 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289 worker_thread+0x618/0xa70 kernel/workqueue.c:2436 kthread+0x1a9/0x1e0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 value changed: 0x00000000000002de -> 0x00000000000002e4 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 30151 Comm: kworker/u4:22 Not tainted 5.18.0-syzkaller-11179-gc3a9a3c5f559-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound flush_to_ldisc ==================================================================