[ 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 '10.128.0.163' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 487.542975][ T8506] IPVS: ftp: loaded support on port[0] = 21 [ 721.385056][ T1659] INFO: task kworker/u4:6:249 blocked for more than 143 seconds. [ 721.393100][ T1659] Not tainted 5.11.0-rc1-syzkaller #0 [ 721.401867][ T1659] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.412111][ T1659] task:kworker/u4:6 state:D stack:24048 pid: 249 ppid: 2 flags:0x00004000 [ 721.422838][ T1659] Workqueue: tc_filter_workqueue tcindex_partial_destroy_work [ 721.431577][ T1659] Call Trace: [ 721.435770][ T1659] __schedule+0x90c/0x21a0 [ 721.440292][ T1659] ? io_schedule_timeout+0x140/0x140 [ 721.447347][ T1659] schedule+0xcf/0x270 [ 721.451740][ T1659] schedule_preempt_disabled+0xf/0x20 [ 721.458731][ T1659] __mutex_lock+0x81a/0x1110 [ 721.463378][ T1659] ? tcindex_partial_destroy_work+0x13/0x50 [ 721.470858][ T1659] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.477211][ T1659] ? lock_release+0x710/0x710 [ 721.481976][ T1659] tcindex_partial_destroy_work+0x13/0x50 [ 721.489791][ T1659] process_one_work+0x98d/0x15f0 [ 721.495879][ T1659] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.501319][ T1659] ? rwlock_bug.part.0+0x90/0x90 [ 721.507842][ T1659] ? _raw_spin_lock_irq+0x41/0x50 [ 721.513007][ T1659] worker_thread+0x64c/0x1120 [ 721.519234][ T1659] ? __kthread_parkme+0x13f/0x1e0 [ 721.524356][ T1659] ? process_one_work+0x15f0/0x15f0 [ 721.531050][ T1659] kthread+0x3b1/0x4a0 [ 721.536087][ T1659] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.542103][ T1659] ret_from_fork+0x1f/0x30 [ 721.548835][ T1659] INFO: task kworker/1:1:8498 blocked for more than 143 seconds. [ 721.557592][ T1659] Not tainted 5.11.0-rc1-syzkaller #0 [ 721.563511][ T1659] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.573924][ T1659] task:kworker/1:1 state:D stack:28928 pid: 8498 ppid: 2 flags:0x00004000 [ 721.584682][ T1659] Workqueue: ipv6_addrconf addrconf_verify_work [ 721.591441][ T1659] Call Trace: [ 721.596904][ T1659] __schedule+0x90c/0x21a0 [ 721.602122][ T1659] ? io_schedule_timeout+0x140/0x140 [ 721.609776][ T1659] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.617812][ T1659] ? lockdep_hardirqs_on+0x79/0x100 [ 721.624210][ T1659] schedule+0xcf/0x270 [ 721.630605][ T1659] schedule_preempt_disabled+0xf/0x20 [ 721.637108][ T1659] __mutex_lock+0x81a/0x1110 [ 721.641776][ T1659] ? addrconf_verify_work+0xa/0x20 [ 721.648626][ T1659] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.654336][ T1659] ? lock_release+0x710/0x710 [ 721.660810][ T1659] ? lock_downgrade+0x6d0/0x6d0 [ 721.667356][ T1659] addrconf_verify_work+0xa/0x20 [ 721.673221][ T1659] process_one_work+0x98d/0x15f0 [ 721.680878][ T1659] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.687368][ T1659] ? rwlock_bug.part.0+0x90/0x90 [ 721.693494][ T1659] ? _raw_spin_lock_irq+0x41/0x50 [ 721.700449][ T1659] worker_thread+0x64c/0x1120 [ 721.706487][ T1659] ? __kthread_parkme+0x13f/0x1e0 [ 721.711569][ T1659] ? process_one_work+0x15f0/0x15f0 [ 721.718524][ T1659] kthread+0x3b1/0x4a0 [ 721.722685][ T1659] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.730267][ T1659] ret_from_fork+0x1f/0x30 [ 721.735908][ T1659] [ 721.735908][ T1659] Showing all locks held in the system: [ 721.743665][ T1659] 3 locks held by kworker/u4:6/249: [ 721.750601][ T1659] #0: ffff888141ac3938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 721.763284][ T1659] #1: ffffc9000144fda8 ((work_completion)(&(rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 721.775917][ T1659] #2: ffffffff8c946768 (rtnl_mutex){+.+.}-{3:3}, at: tcindex_partial_destroy_work+0x13/0x50 [ 721.787194][ T1659] 1 lock held by khungtaskd/1659: [ 721.792274][ T1659] #0: ffffffff8b363860 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.803862][ T1659] 1 lock held by in:imklog/8192: [ 721.809895][ T1659] #0: ffff888021eb39f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.820366][ T1659] 3 locks held by kworker/1:1/8498: [ 721.826561][ T1659] #0: ffff8881477a6938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 721.838882][ T1659] #1: ffffc900016cfda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 721.850297][ T1659] #2: ffffffff8c946768 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 721.860873][ T1659] 1 lock held by syz-executor474/8528: [ 721.867401][ T1659] [ 721.869939][ T1659] ============================================= [ 721.869939][ T1659] [ 721.880380][ T1659] NMI backtrace for cpu 0 [ 721.884741][ T1659] CPU: 0 PID: 1659 Comm: khungtaskd Not tainted 5.11.0-rc1-syzkaller #0 [ 721.893111][ T1659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.903194][ T1659] Call Trace: [ 721.906510][ T1659] dump_stack+0x107/0x163 [ 721.910930][ T1659] nmi_cpu_backtrace.cold+0x44/0xd7 [ 721.916264][ T1659] ? lapic_can_unplug_cpu+0x80/0x80 [ 721.921565][ T1659] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 721.927640][ T1659] watchdog+0xd43/0xfa0 [ 721.931868][ T1659] ? reset_hung_task_detector+0x30/0x30 [ 721.937530][ T1659] kthread+0x3b1/0x4a0 [ 721.941636][ T1659] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.947552][ T1659] ret_from_fork+0x1f/0x30 [ 721.952180][ T1659] Sending NMI from CPU 0 to CPUs 1: [ 721.959737][ C1] NMI backtrace for cpu 1 [ 721.959749][ C1] CPU: 1 PID: 8528 Comm: syz-executor474 Not tainted 5.11.0-rc1-syzkaller #0 [ 721.959759][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.959769][ C1] RIP: 0010:__lock_acquire+0x957/0x5500 [ 721.959780][ C1] Code: 7c 24 10 48 8b 9d 78 09 00 00 85 ff 0f 84 fd 04 00 00 45 31 ff 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 80 3c 02 00 <0f> 85 47 35 00 00 48 8b 14 24 49 89 1c 24 48 b8 00 00 00 00 00 fc [ 721.959796][ C1] RSP: 0018:ffffc90000f0e998 EFLAGS: 00000046 [ 721.959809][ C1] RAX: dffffc0000000000 RBX: 8ebe831388b6856e RCX: ffffffff8158343d [ 721.959818][ C1] RDX: 1ffff11003a90136 RSI: 0000000000000008 RDI: 0000000000000001 [ 721.959826][ C1] RBP: ffff88801d480000 R08: 0000000000000000 R09: ffffffff8ebda867 [ 721.959835][ C1] R10: fffffbfff1d7b50c R11: 0000000000000000 R12: ffff88801d4809b0 [ 721.959844][ C1] R13: ffff88801d4809d2 R14: dffffc0000000000 R15: 0000000000000000 [ 721.959853][ C1] FS: 0000000001494880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 721.959862][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 721.959870][ C1] CR2: 00000000006cf0a0 CR3: 000000001c5e0000 CR4: 00000000001506e0 [ 721.959878][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 721.959888][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 721.959896][ C1] Call Trace: [ 721.959901][ C1] ? lockdep_hardirqs_on+0x79/0x100 [ 721.959908][ C1] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 721.959915][ C1] lock_acquire+0x29d/0x740 [ 721.959921][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.959928][ C1] ? lock_release+0x710/0x710 [ 721.959934][ C1] ? __schedule+0x914/0x21a0 [ 721.959940][ C1] __mutex_lock+0x134/0x1110 [ 721.959946][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.959953][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.959960][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.959966][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 721.959974][ C1] ? wait_for_completion_io+0x260/0x260 [ 721.959980][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 721.959987][ C1] tcf_police_init+0x347/0x13a0 [ 721.959993][ C1] ? tcf_police_cleanup+0x60/0x60 [ 721.960000][ C1] ? find_held_lock+0x2d/0x110 [ 721.960006][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 721.960012][ C1] ? stack_trace_save+0x8c/0xc0 [ 721.960019][ C1] tcf_action_init_1+0x1a3/0x990 [ 721.960025][ C1] ? tcf_action_dump_old+0x80/0x80 [ 721.960031][ C1] ? sock_sendmsg+0xcf/0x120 [ 721.960037][ C1] ? ____sys_sendmsg+0x6e8/0x810 [ 721.960043][ C1] ? ___sys_sendmsg+0xf3/0x170 [ 721.960049][ C1] ? __sys_sendmsg+0xe5/0x1b0 [ 721.960055][ C1] ? do_syscall_64+0x2d/0x70 [ 721.960062][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.960069][ C1] ? find_held_lock+0x2d/0x110 [ 721.960075][ C1] tcf_exts_validate+0x138/0x420 [ 721.960081][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 721.960088][ C1] ? unpoison_range+0x3a/0x60 [ 721.960094][ C1] tcindex_set_parms+0x189/0x20d0 [ 721.960101][ C1] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 721.960108][ C1] ? tcindex_alloc_perfect_hash+0x440/0x440 [ 721.960116][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.960123][ C1] ? __nla_validate_parse+0x2d3/0x2ae0 [ 721.960128][ C1] ? nla_get_range_signed+0x520/0x520 [ 721.960134][ C1] ? find_held_lock+0x2d/0x110 [ 721.960139][ C1] ? tcindex_change+0x1b7/0x320 [ 721.960143][ C1] tcindex_change+0x212/0x320 [ 721.960146][ C1] ? tcindex_set_parms+0x20d0/0x20d0 [ 721.960149][ C1] tc_new_tfilter+0x1394/0x2120 [ 721.960153][ C1] ? tcindex_set_parms+0x20d0/0x20d0 [ 721.960156][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.960160][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.960163][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 721.960166][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.960170][ C1] netlink_rcv_skb+0x153/0x420 [ 721.960173][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.960177][ C1] ? netlink_ack+0xaa0/0xaa0 [ 721.960180][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 721.960184][ C1] netlink_unicast+0x533/0x7d0 [ 721.960187][ C1] ? netlink_attachskb+0x870/0x870 [ 721.960190][ C1] ? _copy_from_iter_full+0x275/0x850 [ 721.960194][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.960198][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 721.960201][ C1] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 721.960205][ C1] ? __check_object_size+0x171/0x3f0 [ 721.960208][ C1] netlink_sendmsg+0x856/0xd90 [ 721.960212][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.960215][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.960219][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.960222][ C1] sock_sendmsg+0xcf/0x120 [ 721.960225][ C1] ____sys_sendmsg+0x6e8/0x810 [ 721.960228][ C1] ? kernel_sendmsg+0x50/0x50 [ 721.960232][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 721.960235][ C1] ? rcu_read_lock_sched_held+0x3a/0x70 [ 721.960238][ C1] ? kfree+0x2d3/0x360 [ 721.960241][ C1] ___sys_sendmsg+0xf3/0x170 [ 721.960244][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 721.960248][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.960251][ C1] ? _copy_to_user+0xdc/0x150 [ 721.960254][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.960258][ C1] ? move_addr_to_user+0xad/0x1e0 [ 721.960262][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.960265][ C1] ? __fget_light+0x215/0x280 [ 721.960269][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.960273][ C1] __sys_sendmsg+0xe5/0x1b0 [ 721.960276][ C1] ? __sys_sendmsg_sock+0xb0/0xb0 [ 721.960279][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.960283][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.960287][ C1] do_syscall_64+0x2d/0x70 [ 721.960290][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.960293][ C1] RIP: 0033:0x4439b9 [ 721.960299][ C1] Code: e8 5c ad 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 bb 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 721.960308][ C1] RSP: 002b:00007fff8b463dc8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 721.960317][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004439b9 [ 721.960322][ C1] RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 [ 721.960327][ C1] RBP: 00007fff8b463dd0 R08: 0000000100000000 R09: 0000000100000000 [ 721.960332][ C1] R10: 0000000100000000 R11: 0000000000000246 R12: 00000000000770aa [ 721.960337][ C1] R13: 0000000000404890 R14: 0000000000000000 R15: 0000000000000000 [ 721.960342][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.812 msecs [ 721.980377][ T1659] Kernel panic - not syncing: hung_task: blocked tasks [ 722.618101][ T1659] CPU: 0 PID: 1659 Comm: khungtaskd Not tainted 5.11.0-rc1-syzkaller #0 [ 722.626984][ T1659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 722.637060][ T1659] Call Trace: [ 722.640390][ T1659] dump_stack+0x107/0x163 [ 722.644928][ T1659] panic+0x306/0x73d [ 722.648875][ T1659] ? __warn_printk+0xf3/0xf3 [ 722.653489][ T1659] ? lapic_can_unplug_cpu+0x80/0x80 [ 722.659271][ T1659] ? preempt_schedule_thunk+0x16/0x18 [ 722.664687][ T1659] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 722.670862][ T1659] ? watchdog.cold+0x5/0x158 [ 722.675667][ T1659] watchdog.cold+0x16/0x158 [ 722.682047][ T1659] ? reset_hung_task_detector+0x30/0x30 [ 722.687659][ T1659] kthread+0x3b1/0x4a0 [ 722.691744][ T1659] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 722.697659][ T1659] ret_from_fork+0x1f/0x30 [ 722.703005][ T1659] Kernel Offset: disabled [ 722.707341][ T1659] Rebooting in 86400 seconds..