Warning: Permanently added '10.128.15.197' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 614.725602] block nbd0: shutting down sockets [ 858.000868] INFO: task syz-executor324:7989 blocked for more than 140 seconds. [ 858.008409] Not tainted 4.14.259-syzkaller #0 [ 858.014599] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 858.023065] syz-executor324 D29824 7989 7978 0x00000004 [ 858.028733] Call Trace: [ 858.031972] __schedule+0x88b/0x1de0 [ 858.035682] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 858.041033] ? io_schedule_timeout+0x140/0x140 [ 858.045617] schedule+0x8d/0x1b0 [ 858.048967] blk_mq_freeze_queue_wait+0xf8/0x1f0 [ 858.053764] ? blk_mq_poll_stats_fn+0x1d0/0x1d0 [ 858.058425] ? dd_has_work+0xb6/0x230 [ 858.062276] ? wait_woken+0x230/0x230 [ 858.066062] ? cfq_slice_async_us_store+0x100/0x100 [ 858.071237] nbd_add_socket+0x158/0x7e0 [ 858.075201] ? nbd_mark_nsock_dead+0x450/0x450 [ 858.079763] ? security_capable+0x88/0xb0 [ 858.083979] nbd_ioctl+0x394/0xa80 [ 858.087509] ? nbd_disconnect_and_put+0x140/0x140 [ 858.092371] ? __lock_acquire+0x5fc/0x3f20 [ 858.096593] ? nbd_disconnect_and_put+0x140/0x140 [ 858.101548] blkdev_ioctl+0x540/0x1830 [ 858.105432] ? blkpg_ioctl+0x8d0/0x8d0 [ 858.109294] ? trace_hardirqs_on+0x10/0x10 [ 858.113561] ? futex_exit_release+0x220/0x220 [ 858.118218] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 858.123381] ? debug_check_no_obj_freed+0x2c0/0x680 [ 858.128454] block_ioctl+0xd9/0x120 [ 858.132101] ? blkdev_fallocate+0x3a0/0x3a0 [ 858.136422] do_vfs_ioctl+0x75a/0xff0 [ 858.140207] ? lock_acquire+0x170/0x3f0 [ 858.144846] ? ioctl_preallocate+0x1a0/0x1a0 [ 858.149260] ? __fget+0x2df/0x460 [ 858.152747] ? do_vfs_ioctl+0xff0/0xff0 [ 858.156713] ? security_file_ioctl+0x83/0xb0 [ 858.161186] SyS_ioctl+0x7f/0xb0 [ 858.164543] ? do_vfs_ioctl+0xff0/0xff0 [ 858.168493] do_syscall_64+0x1d5/0x640 [ 858.172422] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 858.177598] RIP: 0033:0x7fc7a9784299 [ 858.181400] RSP: 002b:00007fc7a9731308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 858.189111] RAX: ffffffffffffffda RBX: 00007fc7a98084e8 RCX: 00007fc7a9784299 [ 858.196415] RDX: 0000000000000004 RSI: 000000000000ab00 RDI: 0000000000000006 [ 858.203742] RBP: 00007fc7a98084e0 R08: 0000000000000000 R09: 0000000000000000 [ 858.211033] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc7a98084ec [ 858.218454] R13: 00007fc7a97d508c R14: 64626e2f7665642f R15: 0000000000022000 [ 858.225780] INFO: task syz-executor324:7990 blocked for more than 140 seconds. [ 858.233173] Not tainted 4.14.259-syzkaller #0 [ 858.238168] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 858.246160] syz-executor324 D30088 7990 7978 0x00000004 [ 858.251829] Call Trace: [ 858.254418] __schedule+0x88b/0x1de0 [ 858.258129] ? io_schedule_timeout+0x140/0x140 [ 858.262852] ? lock_downgrade+0x740/0x740 [ 858.267000] schedule+0x8d/0x1b0 [ 858.270347] schedule_preempt_disabled+0xf/0x20 [ 858.275561] __mutex_lock+0x669/0x1310 [ 858.279452] ? nbd_ioctl+0x11f/0xa80 [ 858.283342] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 858.288911] ? apparmor_capable+0xfa/0x4a0 [ 858.293182] ? security_capable+0x88/0xb0 [ 858.297322] nbd_ioctl+0x11f/0xa80 [ 858.300894] ? nbd_disconnect_and_put+0x140/0x140 [ 858.305730] ? __lock_acquire+0x5fc/0x3f20 [ 858.309944] ? nbd_disconnect_and_put+0x140/0x140 [ 858.314816] blkdev_ioctl+0x540/0x1830 [ 858.318694] ? blkpg_ioctl+0x8d0/0x8d0 [ 858.322617] ? trace_hardirqs_on+0x10/0x10 [ 858.326845] block_ioctl+0xd9/0x120 [ 858.330451] ? blkdev_fallocate+0x3a0/0x3a0 [ 858.334794] do_vfs_ioctl+0x75a/0xff0 [ 858.338691] ? lock_acquire+0x170/0x3f0 [ 858.342697] ? ioctl_preallocate+0x1a0/0x1a0 [ 858.347092] ? __fget+0x2df/0x460 [ 858.350524] ? do_vfs_ioctl+0xff0/0xff0 [ 858.354525] ? security_file_ioctl+0x83/0xb0 [ 858.358924] SyS_ioctl+0x7f/0xb0 [ 858.362318] ? do_vfs_ioctl+0xff0/0xff0 [ 858.366283] do_syscall_64+0x1d5/0x640 [ 858.370150] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 858.375374] RIP: 0033:0x7fc7a9784299 [ 858.379072] RSP: 002b:00007fc7a9710308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 858.386813] RAX: ffffffffffffffda RBX: 00007fc7a98084f8 RCX: 00007fc7a9784299 [ 858.394214] RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006 [ 858.401909] RBP: 00007fc7a98084f0 R08: 00007fc7a9710700 R09: 0000000000000000 [ 858.409163] R10: 00007fc7a9710700 R11: 0000000000000246 R12: 00007fc7a98084fc [ 858.416455] R13: 00007fc7a97d508c R14: 64626e2f7665642f R15: 0000000000022000 [ 858.423817] INFO: task syz-executor324:7991 blocked for more than 140 seconds. [ 858.431221] Not tainted 4.14.259-syzkaller #0 [ 858.436222] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 858.444334] syz-executor324 D29824 7991 7978 0x00000004 [ 858.449959] Call Trace: [ 858.452588] __schedule+0x88b/0x1de0 [ 858.456296] ? io_schedule_timeout+0x140/0x140 [ 858.460910] ? lock_downgrade+0x740/0x740 [ 858.465045] schedule+0x8d/0x1b0 [ 858.468388] schedule_preempt_disabled+0xf/0x20 [ 858.473077] __mutex_lock+0x669/0x1310 [ 858.476953] ? trace_hardirqs_on_caller+0x3a8/0x580 [ 858.482003] ? nbd_ioctl+0x11f/0xa80 [ 858.485759] ? __ww_mutex_wakeup_for_backoff+0x210/0x210 [ 858.491382] ? futex_wait_setup+0x260/0x260 [ 858.495689] ? apparmor_capable+0xfa/0x4a0 [ 858.499902] ? security_capable+0x88/0xb0 [ 858.504090] nbd_ioctl+0x11f/0xa80 [ 858.507617] ? nbd_disconnect_and_put+0x140/0x140 [ 858.512482] ? __lock_acquire+0x5fc/0x3f20 [ 858.516709] ? nbd_disconnect_and_put+0x140/0x140 [ 858.521583] blkdev_ioctl+0x540/0x1830 [ 858.525456] ? blkpg_ioctl+0x8d0/0x8d0 [ 858.529319] ? trace_hardirqs_on+0x10/0x10 [ 858.534122] ? futex_exit_release+0x220/0x220 [ 858.538614] ? _raw_spin_unlock_irqrestore+0x66/0xe0 [ 858.543745] ? debug_check_no_obj_freed+0x2c0/0x680 [ 858.548749] block_ioctl+0xd9/0x120 [ 858.552396] ? blkdev_fallocate+0x3a0/0x3a0 [ 858.556701] do_vfs_ioctl+0x75a/0xff0 [ 858.560477] ? lock_acquire+0x170/0x3f0 [ 858.564473] ? ioctl_preallocate+0x1a0/0x1a0 [ 858.568869] ? __fget+0x2df/0x460 [ 858.572347] ? do_vfs_ioctl+0xff0/0xff0 [ 858.576307] ? security_file_ioctl+0x83/0xb0 [ 858.580746] SyS_ioctl+0x7f/0xb0 [ 858.584096] ? do_vfs_ioctl+0xff0/0xff0 [ 858.588056] do_syscall_64+0x1d5/0x640 [ 858.591970] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 858.597146] RIP: 0033:0x7fc7a9784299 [ 858.600882] RSP: 002b:00007fc7a96ef308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 858.608583] RAX: ffffffffffffffda RBX: 00007fc7a9808508 RCX: 00007fc7a9784299 [ 858.615882] RDX: 0000000000000005 RSI: 000000000000ab07 RDI: 0000000000000007 [ 858.623188] RBP: 00007fc7a9808500 R08: 0000000000000000 R09: 0000000000000000 [ 858.630444] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc7a980850c [ 858.637745] R13: 00007fc7a97d508c R14: 64626e2f7665642f R15: 0000000000022000 [ 858.645078] [ 858.645078] Showing all locks held in the system: [ 858.651435] 1 lock held by khungtaskd/1494: [ 858.655812] #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a [ 858.664920] 1 lock held by syz-executor324/7989: [ 858.669662] #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x11f/0xa80 [ 858.678194] 1 lock held by syz-executor324/7990: [ 858.682997] #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x11f/0xa80 [ 858.691530] 1 lock held by syz-executor324/7991: [ 858.696267] #0: (&nbd->config_lock){+.+.}, at: [] nbd_ioctl+0x11f/0xa80 [ 858.704821] [ 858.706428] ============================================= [ 858.706428] [ 858.714052] NMI backtrace for cpu 0 [ 858.717677] CPU: 0 PID: 1494 Comm: khungtaskd Not tainted 4.14.259-syzkaller #0 [ 858.725275] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.734622] Call Trace: [ 858.737194] dump_stack+0x1b2/0x281 [ 858.740804] nmi_cpu_backtrace.cold+0x57/0x93 [ 858.745281] ? irq_force_complete_move+0x350/0x350 [ 858.750187] nmi_trigger_cpumask_backtrace+0x13a/0x180 [ 858.755452] watchdog+0x5b9/0xb40 [ 858.758895] ? hungtask_pm_notify+0x50/0x50 [ 858.763193] kthread+0x30d/0x420 [ 858.766537] ? kthread_create_on_node+0xd0/0xd0 [ 858.771182] ret_from_fork+0x24/0x30 [ 858.775001] Sending NMI from CPU 0 to CPUs 1: [ 858.779539] NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff8723eb8e [ 858.780496] Kernel panic - not syncing: hung_task: blocked tasks [ 858.792868] CPU: 0 PID: 1494 Comm: khungtaskd Not tainted 4.14.259-syzkaller #0 [ 858.800288] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 858.809617] Call Trace: [ 858.812182] dump_stack+0x1b2/0x281 [ 858.815791] panic+0x1f9/0x42d [ 858.818959] ? add_taint.cold+0x16/0x16 [ 858.822919] watchdog+0x5ca/0xb40 [ 858.826348] ? hungtask_pm_notify+0x50/0x50 [ 858.830652] kthread+0x30d/0x420 [ 858.833997] ? kthread_create_on_node+0xd0/0xd0 [ 858.838659] ret_from_fork+0x24/0x30 [ 858.842760] Kernel Offset: disabled [ 858.846377] Rebooting in 86400 seconds..