Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts. executing program [ 487.402753] Scheduler tracepoints stat_sleep, stat_iowait, stat_blocked and stat_runtime require the kernel parameter schedstats=enable or kernel.sched_schedstats=1 [ 717.635956] INFO: task syz-executor386:8116 blocked for more than 140 seconds. [ 717.643432] Not tainted 4.19.211-syzkaller #0 [ 717.653098] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 717.662084] syz-executor386 D27216 8116 8115 0x00000004 [ 717.685852] Call Trace: [ 717.688616] __schedule+0x887/0x2040 [ 717.692339] ? io_schedule_timeout+0x140/0x140 [ 717.699057] ? mark_held_locks+0xf0/0xf0 [ 717.711242] ? mark_held_locks+0xf0/0xf0 [ 717.715406] schedule+0x8d/0x1b0 [ 717.720943] schedule_timeout+0x92d/0xfe0 [ 717.731331] ? usleep_range+0x170/0x170 [ 717.735306] ? try_to_wake_up+0x733/0x1050 [ 717.742221] ? wait_for_common+0x294/0x470 [ 717.765868] ? mark_held_locks+0xa6/0xf0 [ 717.769937] ? _raw_spin_unlock_irq+0x24/0x80 [ 717.774447] wait_for_common+0x29c/0x470 [ 717.785887] ? __flush_work+0x37e/0x8b0 [ 717.793360] ? bit_wait_io_timeout+0x100/0x100 [ 717.799904] ? wake_up_q+0xe0/0xe0 [ 717.811669] ? mark_held_locks+0xa6/0xf0 [ 717.815731] ? _raw_spin_unlock_irq+0x24/0x80 [ 717.822119] __flush_work+0x4bb/0x8b0 [ 717.845861] ? alloc_unbound_pwq+0xc10/0xc10 [ 717.850275] ? flush_workqueue_prep_pwqs+0x570/0x570 [ 717.855395] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 717.865871] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 717.885864] ? __pollwait+0x255/0x430 [ 717.899112] n_tty_poll+0x54d/0x8f0 [ 717.910774] ? commit_echoes+0x210/0x210 [ 717.914838] tty_poll+0x139/0x1b0 [ 717.919736] ? tty_release+0x1210/0x1210 [ 717.923811] do_select+0x8e1/0x1610 [ 717.939118] ? select_estimate_accuracy+0x320/0x320 [ 717.944152] ? is_bpf_text_address+0xfc/0x1b0 [ 717.955858] ? kernel_text_address+0xbd/0xf0 [ 717.960339] ? poll_initwait+0x170/0x170 [ 717.964406] ? poll_schedule_timeout.constprop.0+0x1e0/0x1e0 [ 717.972099] ? poll_schedule_timeout.constprop.0+0x1e0/0x1e0 [ 717.990692] ? poll_schedule_timeout.constprop.0+0x1e0/0x1e0 [ 717.997346] ? poll_schedule_timeout.constprop.0+0x1e0/0x1e0 [ 718.003163] ? poll_schedule_timeout.constprop.0+0x1e0/0x1e0 [ 718.010159] ? poll_schedule_timeout.constprop.0+0x1e0/0x1e0 [ 718.016698] ? poll_schedule_timeout.constprop.0+0x1e0/0x1e0 [ 718.022596] ? poll_schedule_timeout.constprop.0+0x1e0/0x1e0 [ 718.029527] ? poll_schedule_timeout.constprop.0+0x1e0/0x1e0 [ 718.035339] ? lock_acquire+0x170/0x3c0 [ 718.041062] ? __might_fault+0xef/0x1d0 [ 718.045142] ? __might_fault+0x192/0x1d0 [ 718.050379] core_sys_select+0x3ac/0x7e0 [ 718.054452] ? __se_compat_sys_pselect6+0x4a0/0x4a0 [ 718.061670] ? __lockdep_init_map+0x100/0x5a0 [ 718.066972] ? percpu_counter_add_batch+0x126/0x180 [ 718.072010] ? alloc_empty_file+0xd7/0x170 [ 718.077325] ? errseq_sample+0x56/0x70 [ 718.081221] ? alloc_file+0x326/0x4d0 [ 718.085021] ? __fd_install+0x1b4/0x610 [ 718.090522] ? lock_downgrade+0x720/0x720 [ 718.094693] __se_sys_pselect6+0x419/0x480 [ 718.101292] ? __fd_install+0x1eb/0x610 [ 718.105277] ? kern_select+0x1c0/0x1c0 [ 718.110298] ? __sys_socket+0x16d/0x200 [ 718.114277] ? move_addr_to_kernel+0x70/0x70 [ 718.119870] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 718.125248] ? trace_hardirqs_off_caller+0x6e/0x210 [ 718.131521] ? do_syscall_64+0x21/0x620 [ 718.135524] do_syscall_64+0xf9/0x620 [ 718.140430] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 718.145622] RIP: 0033:0x7f825ede13c9 [ 718.150599] Code: Bad RIP value. [ 718.153968] RSP: 002b:00007ffd2335cbb8 EFLAGS: 00000246 ORIG_RAX: 000000000000010e [ 718.163255] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f825ede13c9 [ 718.171433] RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000040 [ 718.179478] RBP: 00007ffd2335cbf0 R08: 0000000000000000 R09: 0000000000000000 [ 718.187500] R10: 0000000020000140 R11: 0000000000000246 R12: 00007f825eda4990 [ 718.194778] R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000 [ 718.203180] [ 718.203180] Showing all locks held in the system: [ 718.210272] 6 locks held by kworker/u4:2/37: [ 718.214691] 1 lock held by khungtaskd/1571: [ 718.221224] #0: 000000007fc17b8b (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 [ 718.230557] 1 lock held by in:imklog/7811: [ 718.234791] #0: 0000000073ced209 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 [ 718.243821] 1 lock held by syz-executor386/8116: [ 718.249216] #0: 00000000d2b5d8e0 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 [ 718.258423] [ 718.260054] ============================================= [ 718.260054] [ 718.269242] NMI backtrace for cpu 0 [ 718.272881] CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.280319] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.289662] Call Trace: [ 718.292260] dump_stack+0x1fc/0x2ef [ 718.295899] nmi_cpu_backtrace.cold+0x63/0xa2 [ 718.300397] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.304894] nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 [ 718.310175] watchdog+0x991/0xe60 [ 718.313631] ? reset_hung_task_detector+0x30/0x30 [ 718.318474] kthread+0x33f/0x460 [ 718.321833] ? kthread_park+0x180/0x180 [ 718.325807] ret_from_fork+0x24/0x30 [ 718.329680] Sending NMI from CPU 0 to CPUs 1: [ 718.334646] NMI backtrace for cpu 1 [ 718.334652] CPU: 1 PID: 37 Comm: kworker/u4:2 Not tainted 4.19.211-syzkaller #0 [ 718.334658] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.334662] Workqueue: events_unbound flush_to_ldisc [ 718.334668] RIP: 0010:write_comp_data+0xf/0x70 [ 718.334679] Code: 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 c3 0f 1f 84 00 00 00 00 00 49 89 f1 49 89 fa 65 48 8b 34 25 c0 df 01 00 <65> 8b 05 7a 59 9f 7e a9 00 01 1f 00 75 4f 8b 86 60 13 00 00 83 f8 [ 718.334683] RSP: 0018:ffff8880b5147938 EFLAGS: 00000046 [ 718.334690] RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff813d5d0f [ 718.334696] RDX: 0000000000000001 RSI: ffff8880b51382c0 RDI: 0000000000000005 [ 718.334701] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 718.334706] R10: 0000000000000005 R11: 0000000000000000 R12: ffff88813bfcd080 [ 718.334711] R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000008 [ 718.334716] FS: 0000000000000000(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 [ 718.334720] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 718.334726] CR2: 00005555568bb2c0 CR3: 00000000a8814000 CR4: 00000000003406e0 [ 718.334730] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 718.334735] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 718.334738] Call Trace: [ 718.334742] unbound_pwq_by_node+0x1f/0x180 [ 718.334745] __queue_work+0x19f/0x1100 [ 718.334749] ? ___preempt_schedule+0x16/0x18 [ 718.334752] queue_work_on+0x17e/0x1f0 [ 718.334755] pty_write+0x195/0x1f0 [ 718.334758] tty_put_char+0x122/0x150 [ 718.334762] ? dev_match_devt+0x90/0x90 [ 718.334766] ? tty_buffer_space_avail+0x60/0xb0 [ 718.334769] ? pty_write_room+0xbe/0xe0 [ 718.334772] ? ptmx_open+0x350/0x350 [ 718.334776] __process_echoes+0x583/0x9f0 [ 718.334780] n_tty_receive_buf_common+0xc0c/0x2a90 [ 718.334783] tty_ldisc_receive_buf+0xa9/0x190 [ 718.334787] ? n_tty_receive_buf_common+0x2a90/0x2a90 [ 718.334791] tty_port_default_receive_buf+0x78/0xa0 [ 718.334795] flush_to_ldisc+0x21f/0x390 [ 718.334798] process_one_work+0x864/0x1570 [ 718.334802] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 718.334805] worker_thread+0x64c/0x1130 [ 718.334809] ? __kthread_parkme+0x133/0x1e0 [ 718.334812] ? process_one_work+0x1570/0x1570 [ 718.334815] kthread+0x33f/0x460 [ 718.334819] ? kthread_park+0x180/0x180 [ 718.334822] ret_from_fork+0x24/0x30 [ 718.337238] Kernel panic - not syncing: hung_task: blocked tasks [ 718.571568] CPU: 0 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 [ 718.579044] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 718.588401] Call Trace: [ 718.590989] dump_stack+0x1fc/0x2ef [ 718.594619] panic+0x26a/0x50e [ 718.597810] ? __warn_printk+0xf3/0xf3 [ 718.601695] ? lapic_can_unplug_cpu+0x80/0x80 [ 718.606283] ? ___preempt_schedule+0x16/0x18 [ 718.610691] ? watchdog+0x991/0xe60 [ 718.614316] ? nmi_trigger_cpumask_backtrace+0x15e/0x1f0 [ 718.619767] watchdog+0x9a2/0xe60 [ 718.623228] ? reset_hung_task_detector+0x30/0x30 [ 718.628069] kthread+0x33f/0x460 [ 718.631429] ? kthread_park+0x180/0x180 [ 718.635409] ret_from_fork+0x24/0x30 [ 718.639431] Kernel Offset: disabled [ 718.643066] Rebooting in 86400 seconds..