[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.57' (ECDSA) to the list of known hosts. syzkaller login: [ 45.368663][ T6812] IPVS: ftp: loaded support on port[0] = 21 [ 45.384568][ T6814] IPVS: ftp: loaded support on port[0] = 21 [ 45.411066][ T6818] IPVS: ftp: loaded support on port[0] = 21 [ 45.417929][ T6816] IPVS: ftp: loaded support on port[0] = 21 [ 45.426682][ T6815] IPVS: ftp: loaded support on port[0] = 21 [ 45.435297][ T6817] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.408489][ T2605] Bluetooth: hci3: command 0x0409 tx timeout [ 47.408494][ T2718] Bluetooth: hci1: command 0x0409 tx timeout [ 47.408784][ T2605] Bluetooth: hci4: command 0x0409 tx timeout [ 47.414588][ T2718] Bluetooth: hci5: command 0x0409 tx timeout [ 47.439307][ T2605] Bluetooth: hci0: command 0x0409 tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 47.536412][ T2718] Bluetooth: hci2: command 0x0409 tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.487013][ T2605] Bluetooth: hci0: command 0x041b tx timeout [ 49.493244][ T2605] Bluetooth: hci4: command 0x041b tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 49.547771][ T2605] Bluetooth: hci1: command 0x041b tx timeout [ 49.556632][ T2605] Bluetooth: hci3: command 0x041b tx timeout [ 49.581999][ T2605] Bluetooth: hci2: command 0x041b tx timeout [ 49.590120][ T2605] Bluetooth: hci5: command 0x041b tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 51.566274][ T2605] Bluetooth: hci1: command 0x040f tx timeout [ 51.572980][ T2605] Bluetooth: hci4: command 0x040f tx timeout [ 51.604027][ T2605] Bluetooth: hci0: command 0x040f tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 51.646310][ T2605] Bluetooth: hci5: command 0x040f tx timeout [ 51.653754][ T2605] Bluetooth: hci2: command 0x040f tx timeout [ 51.672114][ T2605] Bluetooth: hci3: command 0x040f tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 53.645480][ T2605] Bluetooth: hci0: command 0x0419 tx timeout [ 53.652693][ T2605] Bluetooth: hci4: command 0x0419 tx timeout executing program executing program executing program executing program executing program executing program executing program [ 53.696602][ T2605] Bluetooth: hci1: command 0x0419 tx timeout [ 53.729088][ T2605] Bluetooth: hci3: command 0x0419 tx timeout [ 53.739679][ T2605] Bluetooth: hci2: command 0x0419 tx timeout executing program executing program executing program executing program executing program executing program executing program executing program [ 53.750373][ T2605] Bluetooth: hci5: command 0x0419 tx timeout executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 64.533888][T12120] ttyprintk ttyprintk: tty_port_close_start: tty->count = 1 port count = 2562 [ 64.543661][ C1] [ 64.543666][ C1] ====================================================== [ 64.543669][ C1] WARNING: possible circular locking dependency detected [ 64.543672][ C1] 5.8.0-syzkaller #0 Not tainted [ 64.543675][ C1] ------------------------------------------------------ [ 64.543678][ C1] syz-executor176/12120 is trying to acquire lock: [ 64.543681][ C1] ffffffff894fc6a0 (console_owner){-.-.}-{0:0}, at: console_lock_spinning_enable+0x2d/0x60 [ 64.543690][ C1] [ 64.543693][ C1] but task is already holding lock: [ 64.543695][ C1] ffffffff8c322760 (&port->lock#2){-.-.}-{2:2}, at: tty_port_close_start+0x58/0x550 [ 64.543705][ C1] [ 64.543708][ C1] which lock already depends on the new lock. [ 64.543709][ C1] [ 64.543711][ C1] [ 64.543713][ C1] the existing dependency chain (in reverse order) is: [ 64.543715][ C1] [ 64.543716][ C1] -> #2 (&port->lock#2){-.-.}-{2:2}: [ 64.543725][ C1] lock_acquire+0x160/0x730 [ 64.543728][ C1] _raw_spin_lock_irqsave+0x9e/0xc0 [ 64.543730][ C1] tty_port_tty_get+0x21/0xe0 [ 64.543733][ C1] tty_port_default_wakeup+0x11/0x40 [ 64.543735][ C1] serial8250_tx_chars+0x5ea/0x800 [ 64.543738][ C1] serial8250_handle_irq+0x2fd/0x3e0 [ 64.543740][ C1] serial8250_default_handle_irq+0xac/0x190 [ 64.543742][ C1] serial8250_interrupt+0x93/0x180 [ 64.543745][ C1] __handle_irq_event_percpu+0x1b7/0x610 executing program executing program [ 64.543747][ C1] handle_irq_event+0xbd/0x280 [ 64.543750][ C1] handle_edge_irq+0x245/0xbf0 [ 64.543752][ C1] asm_call_on_stack+0xf/0x20 [ 64.543754][ C1] common_interrupt+0x13c/0x230 [ 64.543756][ C1] asm_common_interrupt+0x1e/0x40 [ 64.543758][ C1] native_safe_halt+0xe/0x10 [ 64.543760][ C1] acpi_safe_halt+0x87/0xe0 [ 64.543762][ C1] acpi_idle_enter+0x3ef/0xac0 [ 64.543765][ C1] cpuidle_enter_state+0x2d7/0x7b0 [ 64.543767][ C1] cpuidle_enter+0x59/0x90 [ 64.543769][ C1] do_idle+0x49c/0x650 [ 64.543772][ C1] cpu_startup_entry+0x15/0x20 [ 64.543774][ C1] secondary_startup_64+0xa4/0xb0 [ 64.543776][ C1] [ 64.543777][ C1] -> #1 (&port->lock){-.-.}-{2:2}: [ 64.543788][ C1] lock_acquire+0x160/0x730 [ 64.543790][ C1] _raw_spin_lock_irqsave+0x9e/0xc0 [ 64.543792][ C1] serial8250_console_write+0x13e/0xd60 [ 64.543794][ C1] console_unlock+0x90c/0xec0 executing program executing program [ 64.543796][ C1] vprintk_emit+0x1f8/0x3c0 [ 64.543798][ C1] printk+0x62/0x83 [ 64.543801][ C1] register_console+0x7ca/0xad0 [ 64.543803][ C1] univ8250_console_init+0x41/0x43 [ 64.543805][ C1] console_init+0x52/0x97 [ 64.543807][ C1] start_kernel+0x2db/0x4f0 [ 64.543810][ C1] secondary_startup_64+0xa4/0xb0 [ 64.543811][ C1] [ 64.543813][ C1] -> #0 (console_owner){-.-.}-{0:0}: [ 64.543821][ C1] validate_chain+0x1b0c/0x88a0 [ 64.543823][ C1] __lock_acquire+0x1161/0x2ab0 [ 64.543826][ C1] lock_acquire+0x160/0x730 [ 64.543829][ C1] console_lock_spinning_enable+0x52/0x60 [ 64.543831][ C1] console_unlock+0x73f/0xec0 [ 64.543834][ C1] vprintk_emit+0x1f8/0x3c0 [ 64.543836][ C1] printk+0x62/0x83 [ 64.543839][ C1] tty_port_close_start+0x3c8/0x550 [ 64.543841][ C1] tty_port_close+0x25/0x140 [ 64.543844][ C1] tty_release+0x378/0xf90 [ 64.543846][ C1] __fput+0x34f/0x7b0 [ 64.543848][ C1] task_work_run+0x137/0x1c0 executing program executing program [ 64.543850][ C1] exit_to_user_mode_prepare+0xfa/0x1b0 [ 64.543853][ C1] syscall_exit_to_user_mode+0x5e/0x1a0 [ 64.543855][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.543856][ C1] [ 64.543859][ C1] other info that might help us debug this: [ 64.543860][ C1] [ 64.543862][ C1] Chain exists of: [ 64.543863][ C1] console_owner --> &port->lock --> &port->lock#2 [ 64.543874][ C1] [ 64.543876][ C1] Possible unsafe locking scenario: [ 64.543877][ C1] [ 64.543879][ C1] CPU0 CPU1 [ 64.543881][ C1] ---- ---- [ 64.543883][ C1] lock(&port->lock#2); [ 64.543889][ C1] lock(&port->lock); [ 64.543893][ C1] lock(&port->lock#2); [ 64.543899][ C1] lock(console_owner); [ 64.543903][ C1] [ 64.543905][ C1] *** DEADLOCK *** [ 64.543906][ C1] [ 64.543908][ C1] 3 locks held by syz-executor176/12120: executing program [ 64.543910][ C1] #0: ffff88809e56f1c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_release+0xa5/0xf90 [ 64.543919][ C1] #1: ffffffff8c322760 (&port->lock#2){-.-.}-{2:2}, at: tty_port_close_start+0x58/0x550 [ 64.543929][ C1] #2: ffffffff894fc580 (console_lock){+.+.}-{0:0}, at: vprintk_emit+0x1db/0x3c0 [ 64.543938][ C1] [ 64.543940][ C1] stack backtrace: [ 64.543943][ C1] CPU: 1 PID: 12120 Comm: syz-executor176 Not tainted 5.8.0-syzkaller #0 [ 64.543947][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 executing program [ 64.543949][ C1] Call Trace: [ 64.543951][ C1] dump_stack+0x1f0/0x31e [ 64.543953][ C1] print_circular_bug+0xc72/0xea0 [ 64.543955][ C1] ? stack_trace_save+0xad/0x150 [ 64.543957][ C1] ? save_trace+0x49/0xba0 [ 64.543959][ C1] check_noncircular+0x1fb/0x3a0 [ 64.543961][ C1] validate_chain+0x1b0c/0x88a0 [ 64.543963][ C1] ? mark_lock+0x102/0x1b00 [ 64.543965][ C1] ? mark_lock+0x102/0x1b00 [ 64.543967][ C1] ? put_dec_trunc8+0x19a/0x290 [ 64.543970][ C1] ? number+0xf14/0x1190 executing program executing program [ 64.543972][ C1] __lock_acquire+0x1161/0x2ab0 [ 64.543974][ C1] ? sprintf+0x71/0x90 [ 64.543976][ C1] lock_acquire+0x160/0x730 [ 64.543978][ C1] ? console_lock_spinning_enable+0x2d/0x60 [ 64.543980][ C1] console_lock_spinning_enable+0x52/0x60 [ 64.543983][ C1] ? console_lock_spinning_enable+0x2d/0x60 [ 64.543985][ C1] console_unlock+0x73f/0xec0 [ 64.543987][ C1] ? __down_trylock_console_sem+0x178/0x1b0 [ 64.543989][ C1] ? vprintk_emit+0x1db/0x3c0 [ 64.543991][ C1] ? vprintk_emit+0x1db/0x3c0 [ 64.543993][ C1] vprintk_emit+0x1f8/0x3c0 [ 64.543995][ C1] printk+0x62/0x83 [ 64.543998][ C1] tty_port_close_start+0x3c8/0x550 [ 64.544000][ C1] tty_port_close+0x25/0x140 [ 64.544002][ C1] ? tpk_open+0x60/0x60 [ 64.544005][ C1] tty_release+0x378/0xf90 [ 64.544007][ C1] ? ima_file_free+0xea/0x3b0 [ 64.544009][ C1] ? tty_release_struct+0xd0/0xd0 [ 64.544011][ C1] __fput+0x34f/0x7b0 [ 64.544014][ C1] task_work_run+0x137/0x1c0 [ 64.544016][ C1] exit_to_user_mode_prepare+0xfa/0x1b0 executing program [ 64.544019][ C1] syscall_exit_to_user_mode+0x5e/0x1a0 [ 64.544021][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 64.544023][ C1] RIP: 0033:0x407111 [ 64.544031][ C1] Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 [ 64.544034][ C1] RSP: 002b:00007ffcdb2ff4f0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 [ 64.544039][ C1] RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000407111 executing program executing program executing program executing program executing program executing program executing program executing program [ 64.544043][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 [ 64.544046][ C1] RBP: 00000000006e4a10 R08: 0000000000000000 R09: 0000000000000000 [ 64.544049][ C1] R10: 00007ffcdb2ff520 R11: 0000000000000293 R12: 00000000006e4a1c [ 64.544052][ C1] R13: 0000000000000001 R14: 000000000000002d R15: 20c49ba5e353f7cf executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program