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================================================================== BUG: KCSAN: data-race in __stop_tty / pty_write_room write to 0xffff888119b86dbc of 1 bytes by task 6137 on cpu 0: __stop_tty+0x36/0x90 drivers/tty/tty_io.c:744 n_tty_ioctl_helper+0x1e9/0x210 drivers/tty/tty_ioctl.c:951 n_tty_ioctl+0x101/0x200 drivers/tty/n_tty.c:2509 tty_ioctl+0x845/0xb80 drivers/tty/tty_io.c:2801 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 to 0xffff888119b86dbc of 1 bytes by task 31 on cpu 1: pty_write_room+0x19/0x70 drivers/tty/pty.c:131 tty_write_room+0x3c/0x60 drivers/tty/tty_ioctl.c:69 __process_echoes+0x36/0x6b0 drivers/tty/n_tty.c:687 flush_echoes drivers/tty/n_tty.c:791 [inline] __receive_buf drivers/tty/n_tty.c:1626 [inline] n_tty_receive_buf_common+0x8e4/0xbe0 drivers/tty/n_tty.c:1723 n_tty_receive_buf2+0x33/0x40 drivers/tty/n_tty.c:1769 tty_ldisc_receive_buf+0x63/0xf0 drivers/tty/tty_buffer.c:387 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+0x144/0x360 drivers/tty/tty_buffer.c:495 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+0x486/0x510 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: 0x00 -> 0x01 Reported by Kernel Concurrency Sanitizer on: CPU: 1 UID: 0 PID: 31 Comm: kworker/u8:1 Not tainted 6.16.0-rc1-syzkaller-00101-g27605c8c0f69 #0 PREEMPT(voluntary) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_unbound flush_to_ldisc ==================================================================
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2025/06/13 00:12 | upstream | 27605c8c0f69 | 98683f8f | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-kcsan-gce | KCSAN: data-race in __stop_tty / pty_write_room |