[ 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 '10.128.1.22' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 480.329904][ T8474] block nbd0: shutting down sockets [ 715.729505][ T1649] INFO: task syz-executor101:8474 blocked for more than 143 seconds. [ 715.737809][ T1649] Not tainted 5.14.0-rc2-syzkaller #0 [ 715.743764][ T1649] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 715.752821][ T1649] task:syz-executor101 state:D stack:27408 pid: 8474 ppid: 8473 flags:0x00004004 [ 715.762904][ T1649] Call Trace: [ 715.766222][ T1649] __schedule+0x93a/0x26f0 [ 715.770817][ T1649] ? io_schedule_timeout+0x140/0x140 [ 715.776243][ T1649] schedule+0xd3/0x270 [ 715.781120][ T1649] schedule_timeout+0x1db/0x2a0 [ 715.785999][ T1649] ? usleep_range+0x170/0x170 [ 715.791353][ T1649] ? wait_for_completion+0x16e/0x280 [ 715.796766][ T1649] ? lock_downgrade+0x6e0/0x6e0 [ 715.802496][ T1649] ? do_raw_spin_lock+0x120/0x2b0 [ 715.808425][ T1649] ? rwlock_bug.part.0+0x90/0x90 [ 715.813858][ T1649] ? _raw_spin_unlock_irq+0x1f/0x40 [ 715.819099][ T1649] wait_for_completion+0x176/0x280 [ 715.824350][ T1649] ? __mutex_unlock_slowpath+0xe2/0x610 [ 715.830128][ T1649] ? bit_wait_io_timeout+0x160/0x160 [ 715.835431][ T1649] ? flush_workqueue_prep_pwqs+0x2ae/0x510 [ 715.841365][ T1649] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 715.847641][ T1649] ? check_flush_dependency+0x86/0x400 [ 715.853439][ T1649] flush_workqueue+0x3ff/0x1600 [ 715.858301][ T1649] ? find_held_lock+0x2d/0x110 [ 715.863361][ T1649] ? check_flush_dependency+0x400/0x400 [ 715.868933][ T1649] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 715.875500][ T1649] ? sock_shutdown+0xb2/0x200 [ 715.880398][ T1649] nbd_ioctl+0x60e/0xa50 [ 715.884657][ T1649] ? nbd_release+0x1a0/0x1a0 [ 715.889412][ T1649] ? finish_wait+0x270/0x270 [ 715.894119][ T1649] ? find_held_lock+0x2d/0x110 [ 715.898873][ T1649] ? nbd_release+0x1a0/0x1a0 [ 715.903610][ T1649] blkdev_ioctl+0x2a1/0x6d0 [ 715.908118][ T1649] ? blkdev_common_ioctl+0x1830/0x1830 [ 715.914569][ T1649] block_ioctl+0xf9/0x140 [ 715.919682][ T1649] ? bd_unlink_disk_holder+0x430/0x430 [ 715.925383][ T1649] __x64_sys_ioctl+0x193/0x200 [ 715.930344][ T1649] do_syscall_64+0x35/0xb0 [ 715.934768][ T1649] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 715.940713][ T1649] RIP: 0033:0x444279 [ 715.944611][ T1649] RSP: 002b:00007ffc8db35ca8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 715.953157][ T1649] RAX: ffffffffffffffda RBX: 00000000004004a0 RCX: 0000000000444279 [ 715.961215][ T1649] RDX: 00000000ffffffff RSI: 000000000000ab03 RDI: 0000000000000005 [ 715.969497][ T1649] RBP: 0000000000000000 R08: 00007ffc8db35e48 R09: 00007ffc8db35e48 [ 715.977480][ T1649] R10: 00007ffc8db35e48 R11: 0000000000000246 R12: 0000000000403590 [ 715.986403][ T1649] R13: 431bde82d7b634db R14: 00000000004b2018 R15: 00000000004004a0 [ 715.995248][ T1649] [ 715.995248][ T1649] Showing all locks held in the system: [ 716.003680][ T1649] 2 locks held by kworker/u4:3/83: [ 716.008812][ T1649] 1 lock held by khungtaskd/1649: [ 716.013965][ T1649] #0: ffffffff8b97b9c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 716.023905][ T1649] 2 locks held by kworker/u5:0/2035: [ 716.029188][ T1649] #0: ffff888019337938 ((wq_completion)knbd0-recv){+.+.}-{0:0}, at: process_one_work+0x871/0x1630 [ 716.040773][ T1649] #1: ffffc900077dfdb0 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1630 [ 716.052462][ T1649] 1 lock held by in:imklog/8376: [ 716.057579][ T1649] #0: ffff888023782870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 716.066852][ T1649] [ 716.069916][ T1649] ============================================= [ 716.069916][ T1649] [ 716.078633][ T1649] NMI backtrace for cpu 0 [ 716.083159][ T1649] CPU: 0 PID: 1649 Comm: khungtaskd Not tainted 5.14.0-rc2-syzkaller #0 [ 716.091497][ T1649] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.102759][ T1649] Call Trace: [ 716.106031][ T1649] dump_stack_lvl+0xcd/0x134 [ 716.110612][ T1649] nmi_cpu_backtrace.cold+0x44/0xd7 [ 716.115797][ T1649] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.121067][ T1649] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 716.127317][ T1649] watchdog+0xd0a/0xfc0 [ 716.131725][ T1649] ? reset_hung_task_detector+0x30/0x30 [ 716.137263][ T1649] kthread+0x3e5/0x4d0 [ 716.141323][ T1649] ? set_kthread_struct+0x130/0x130 [ 716.147558][ T1649] ret_from_fork+0x1f/0x30 [ 716.152563][ T1649] Sending NMI from CPU 0 to CPUs 1: [ 716.158534][ C1] NMI backtrace for cpu 1 [ 716.158544][ C1] CPU: 1 PID: 83 Comm: kworker/u4:3 Not tainted 5.14.0-rc2-syzkaller #0 [ 716.158551][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.158559][ C1] Workqueue: events_unbound toggle_allocation_gate [ 716.158568][ C1] RIP: 0010:__lock_acquire+0x315/0x54a0 [ 716.158576][ C1] Code: 00 00 00 fc ff df 48 89 f1 48 89 74 24 40 49 89 44 24 18 65 8b 05 63 50 a7 7e 85 c0 0f 95 c0 48 c1 e9 03 83 e6 07 0f b6 0c 11 <48> 89 f2 0f b6 c0 83 c2 03 01 c0 38 ca 7c 08 84 c9 0f 85 70 12 00 [ 716.158588][ C1] RSP: 0018:ffffc9000104f790 EFLAGS: 00000002 [ 716.158597][ C1] RAX: 0000000000000000 RBX: ffff8880109ae138 RCX: 0000000000000000 [ 716.158603][ C1] RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffff888014b88ac8 [ 716.158610][ C1] RBP: 0000000000000000 R08: 1ffff11002971156 R09: 0000000000000000 [ 716.158616][ C1] R10: 0000000000000000 R11: 000000000000003f R12: ffff888014b88ab8 [ 716.158623][ C1] R13: ffff888014b88000 R14: 0000000000000000 R15: 0000000000000000 [ 716.158630][ C1] FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 716.158636][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 716.158642][ C1] CR2: 00007fec49b53000 CR3: 000000000b68e000 CR4: 0000000000350ee0 [ 716.158648][ C1] Call Trace: [ 716.158651][ C1] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 716.158656][ C1] ? mark_lock+0xef/0x17b0 [ 716.158660][ C1] lock_acquire+0x1ab/0x510 [ 716.158664][ C1] ? __get_locked_pte+0x2b6/0x4d0 [ 716.158668][ C1] ? lock_release+0x720/0x720 [ 716.158672][ C1] ? __text_poke+0x5d1/0x8c0 [ 716.158676][ C1] ? lock_downgrade+0x6e0/0x6e0 [ 716.158680][ C1] _raw_spin_lock+0x2a/0x40 [ 716.158684][ C1] ? __get_locked_pte+0x2b6/0x4d0 [ 716.158688][ C1] __get_locked_pte+0x2b6/0x4d0 [ 716.158692][ C1] ? kmem_cache_alloc_node+0xb5/0x3e0 [ 716.158697][ C1] __text_poke+0x1ab/0x8c0 [ 716.158701][ C1] ? text_poke_loc_init+0x340/0x340 [ 716.158705][ C1] ? kmem_cache_alloc_node+0xb5/0x3e0 [ 716.158709][ C1] text_poke_bp_batch+0x3d7/0x560 [ 716.158714][ C1] ? alternatives_enable_smp+0xf0/0xf0 [ 716.158718][ C1] ? mutex_lock_io_nested+0xf00/0xf00 [ 716.158723][ C1] ? __jump_label_patch+0x159/0x1b0 [ 716.158727][ C1] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80 [ 716.158732][ C1] ? __jump_label_update+0x351/0x400 [ 716.158737][ C1] text_poke_finish+0x16/0x30 [ 716.158741][ C1] arch_jump_label_transform_apply+0x13/0x20 [ 716.158746][ C1] jump_label_update+0x1d5/0x430 [ 716.158750][ C1] static_key_enable_cpuslocked+0x1b1/0x260 [ 716.158755][ C1] static_key_enable+0x16/0x20 [ 716.158759][ C1] toggle_allocation_gate+0x100/0x390 [ 716.158763][ C1] ? lock_release+0x720/0x720 [ 716.158767][ C1] ? wake_up_kfence_timer+0x20/0x20 [ 716.158772][ C1] process_one_work+0x98d/0x1630 [ 716.158776][ C1] ? pwq_dec_nr_in_flight+0x320/0x320 [ 716.158780][ C1] ? rwlock_bug.part.0+0x90/0x90 [ 716.158785][ C1] ? _raw_spin_lock_irq+0x41/0x50 [ 716.158789][ C1] worker_thread+0x658/0x11f0 [ 716.158793][ C1] ? process_one_work+0x1630/0x1630 [ 716.158797][ C1] kthread+0x3e5/0x4d0 [ 716.158801][ C1] ? set_kthread_struct+0x130/0x130 [ 716.158805][ C1] ret_from_fork+0x1f/0x30 [ 716.159210][ T1649] Kernel panic - not syncing: hung_task: blocked tasks [ 716.483239][ T1649] CPU: 0 PID: 1649 Comm: khungtaskd Not tainted 5.14.0-rc2-syzkaller #0 [ 716.491729][ T1649] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.501769][ T1649] Call Trace: [ 716.505035][ T1649] dump_stack_lvl+0xcd/0x134 [ 716.509624][ T1649] panic+0x306/0x73d [ 716.513510][ T1649] ? __warn_printk+0xf3/0xf3 [ 716.518091][ T1649] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.523279][ T1649] ? preempt_schedule_thunk+0x16/0x18 [ 716.528665][ T1649] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 716.534809][ T1649] ? watchdog.cold+0x5/0x158 [ 716.539394][ T1649] watchdog.cold+0x16/0x158 [ 716.543889][ T1649] ? reset_hung_task_detector+0x30/0x30 [ 716.549423][ T1649] kthread+0x3e5/0x4d0 [ 716.553482][ T1649] ? set_kthread_struct+0x130/0x130 [ 716.558669][ T1649] ret_from_fork+0x1f/0x30 [ 716.569354][ T1649] Kernel Offset: disabled [ 716.573679][ T1649] Rebooting in 86400 seconds..