[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.28' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 510.099114][ T6881] IPVS: ftp: loaded support on port[0] = 21 [ 780.176686][ T1174] INFO: task kworker/0:1:12 blocked for more than 143 seconds. [ 780.184374][ T1174] Not tainted 5.9.0-rc8-syzkaller #0 [ 780.192749][ T1174] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 780.202399][ T1174] task:kworker/0:1 state:D stack:26824 pid: 12 ppid: 2 flags:0x00004000 [ 780.212900][ T1174] Workqueue: ipv6_addrconf addrconf_verify_work [ 780.220145][ T1174] Call Trace: [ 780.223481][ T1174] __schedule+0xec9/0x2280 [ 780.229933][ T1174] ? io_schedule_timeout+0x140/0x140 [ 780.235307][ T1174] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 780.242757][ T1174] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.248951][ T1174] ? lockdep_hardirqs_on+0x53/0x100 [ 780.254178][ T1174] schedule+0xd0/0x2a0 [ 780.259663][ T1174] schedule_preempt_disabled+0xf/0x20 [ 780.265048][ T1174] __mutex_lock+0x3e2/0x10e0 [ 780.272124][ T1174] ? addrconf_verify_work+0xa/0x20 [ 780.278189][ T1174] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.283615][ T1174] ? lock_release+0x8f0/0x8f0 [ 780.289656][ T1174] ? lock_downgrade+0x830/0x830 [ 780.294532][ T1174] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.301205][ T1174] ? lock_is_held_type+0xbb/0xf0 [ 780.306185][ T1174] addrconf_verify_work+0xa/0x20 [ 780.312668][ T1174] process_one_work+0x94c/0x1670 [ 780.318590][ T1174] ? lock_release+0x8f0/0x8f0 [ 780.323291][ T1174] ? pwq_dec_nr_in_flight+0x320/0x320 [ 780.330130][ T1174] ? rwlock_bug.part.0+0x90/0x90 [ 780.335181][ T1174] ? lockdep_hardirqs_off+0x96/0xd0 [ 780.341955][ T1174] worker_thread+0x64c/0x1120 [ 780.347558][ T1174] ? process_one_work+0x1670/0x1670 [ 780.352776][ T1174] kthread+0x3b5/0x4a0 [ 780.358403][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 780.363535][ T1174] ret_from_fork+0x1f/0x30 [ 780.369628][ T1174] [ 780.369628][ T1174] Showing all locks held in the system: [ 780.379358][ T1174] 3 locks held by kworker/0:1/12: [ 780.384386][ T1174] #0: ffff888099cf3938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 780.398023][ T1174] #1: ffffc90000d2fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 780.410068][ T1174] #2: ffffffff8b17bcc8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 780.420706][ T1174] 1 lock held by khungtaskd/1174: [ 780.425738][ T1174] #0: ffffffff8a068480 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 780.437197][ T1174] 1 lock held by in:imklog/6739: [ 780.442144][ T1174] #0: ffff8880a8bc9930 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 780.453047][ T1174] 2 locks held by syz-executor397/6902: [ 780.459614][ T1174] [ 780.461950][ T1174] ============================================= [ 780.461950][ T1174] [ 780.472866][ T1174] NMI backtrace for cpu 0 [ 780.477304][ T1174] CPU: 0 PID: 1174 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 780.485651][ T1174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.495707][ T1174] Call Trace: [ 780.499114][ T1174] dump_stack+0x198/0x1fd [ 780.503452][ T1174] nmi_cpu_backtrace.cold+0x70/0xb1 [ 780.508660][ T1174] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 780.514324][ T1174] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 780.520316][ T1174] watchdog+0xd7d/0x1000 [ 780.524565][ T1174] ? reset_hung_task_detector+0x30/0x30 [ 780.530153][ T1174] kthread+0x3b5/0x4a0 [ 780.534223][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 780.539350][ T1174] ret_from_fork+0x1f/0x30 [ 780.544008][ T1174] Sending NMI from CPU 0 to CPUs 1: [ 780.550840][ C1] NMI backtrace for cpu 1 [ 780.550847][ C1] CPU: 1 PID: 6902 Comm: syz-executor397 Not tainted 5.9.0-rc8-syzkaller #0 [ 780.550854][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.550858][ C1] RIP: 0010:__lock_acquire+0x70c/0x5780 [ 780.550869][ C1] Code: 66 81 e2 ff 1f 44 0f b7 e2 be 08 00 00 00 4c 89 e0 48 c1 f8 06 48 8d 3c c5 e0 39 11 8d e8 ec 62 5c 00 4c 0f a3 25 c4 77 b5 0b <0f> 82 38 ff ff ff 48 c7 c0 60 11 49 8d 48 c1 e8 03 42 0f b6 14 30 [ 780.550874][ C1] RSP: 0018:ffffc900056469a0 EFLAGS: 00000047 [ 780.550882][ C1] RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff815bc214 [ 780.550888][ C1] RDX: fffffbfff1a22740 RSI: 0000000000000008 RDI: ffffffff8d1139f8 [ 780.550893][ C1] RBP: ffff8880a885c540 R08: 0000000000000000 R09: ffffffff8d1139ff [ 780.550899][ C1] R10: fffffbfff1a2273f R11: 0000000000000000 R12: 00000000000000e8 [ 780.550904][ C1] R13: 0000000000000004 R14: dffffc0000000000 R15: ffff8880a885ce48 [ 780.550910][ C1] FS: 000000000248c880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 780.550915][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 780.550920][ C1] CR2: 0000000020000280 CR3: 00000000a7a49000 CR4: 00000000001506e0 [ 780.550926][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 780.550931][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 780.550934][ C1] Call Trace: [ 780.550938][ C1] ? lockdep_hardirqs_on+0x53/0x100 [ 780.550943][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.550946][ C1] lock_acquire+0x1f3/0xaf0 [ 780.550950][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 780.550954][ C1] ? lock_release+0x8f0/0x8f0 [ 780.550958][ C1] ? kvm_sched_clock_read+0x14/0x40 [ 780.550962][ C1] ? preempt_schedule_thunk+0x16/0x18 [ 780.550966][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.550970][ C1] __mutex_lock+0x134/0x10e0 [ 780.550974][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 780.550978][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 780.550982][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.550986][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 780.550991][ C1] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 780.550995][ C1] ? wait_for_completion+0x260/0x260 [ 780.550999][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 780.551003][ C1] tcf_police_init+0x347/0x13a0 [ 780.551007][ C1] ? tcf_police_cleanup+0x60/0x60 [ 780.551011][ C1] ? find_held_lock+0x2d/0x110 [ 780.551014][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 780.551018][ C1] tcf_action_init_1+0x1a3/0x990 [ 780.551022][ C1] ? tcf_action_dump_old+0x80/0x80 [ 780.551026][ C1] ? lock_acquire+0x1f3/0xaf0 [ 780.551030][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.551034][ C1] ? find_held_lock+0x2d/0x110 [ 780.551038][ C1] ? fs_reclaim_release+0x90/0xd0 [ 780.551041][ C1] ? mark_lock+0x82/0x1660 [ 780.551045][ C1] tcf_exts_validate+0x138/0x420 [ 780.551049][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 780.551053][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 780.551057][ C1] ? __nla_parse+0x3d/0x4a [ 780.551061][ C1] rsvp_change+0x291/0x27a0 [ 780.551064][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.551068][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.551072][ C1] ? find_held_lock+0x2d/0x110 [ 780.551076][ C1] ? tc_new_tfilter+0x1be4/0x2130 [ 780.551080][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 780.551084][ C1] ? lock_downgrade+0x830/0x830 [ 780.551088][ C1] ? blackhole_dequeue+0x10/0x10 [ 780.551092][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.551096][ C1] tc_new_tfilter+0x1398/0x2130 [ 780.551110][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 780.551114][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.551118][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.551123][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.551127][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.551131][ C1] ? security_capable+0x8f/0xc0 [ 780.551135][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.551139][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.551142][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 780.551147][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 780.551150][ C1] ? lock_acquire+0x1f3/0xaf0 [ 780.551154][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 780.551158][ C1] netlink_rcv_skb+0x153/0x420 [ 780.551162][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 780.551165][ C1] ? netlink_ack+0xaa0/0xaa0 [ 780.551170][ C1] ? __kmalloc_node_track_caller+0x38/0x60 [ 780.551174][ C1] netlink_unicast+0x533/0x7d0 [ 780.551178][ C1] ? netlink_attachskb+0x810/0x810 [ 780.551182][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 780.551186][ C1] ? __check_object_size+0x171/0x3e4 [ 780.551189][ C1] netlink_sendmsg+0x856/0xd90 [ 780.551193][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 780.551197][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 780.551201][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 780.551205][ C1] sock_sendmsg+0xcf/0x120 [ 780.551209][ C1] ____sys_sendmsg+0x331/0x810 [ 780.551213][ C1] ? kernel_sendmsg+0x50/0x50 [ 780.551216][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 780.551220][ C1] ? sock_alloc_file+0x4f/0x190 [ 780.551224][ C1] ? __lock_acquire+0x164a/0x5780 [ 780.551228][ C1] ___sys_sendmsg+0xf3/0x170 [ 780.551232][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 780.551236][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.551240][ C1] ? fs_reclaim_release+0x90/0xd0 [ 780.551244][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.551248][ C1] ? find_held_lock+0x2d/0x110 [ 780.551252][ C1] ? __might_fault+0x11f/0x1d0 [ 780.551256][ C1] ? lock_downgrade+0x830/0x830 [ 780.551260][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.551264][ C1] __sys_sendmmsg+0x195/0x480 [ 780.551269][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 780.551273][ C1] ? find_held_lock+0x2d/0x110 [ 780.551276][ C1] ? __fd_install+0x1b4/0x600 [ 780.551281][ C1] ? alloc_file_pseudo+0x1/0x250 [ 780.551285][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.551289][ C1] ? __fd_install+0x1e6/0x600 [ 780.551293][ C1] ? __sys_socket+0x16d/0x200 [ 780.551297][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.551301][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 780.551306][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 780.551310][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 780.551314][ C1] do_syscall_64+0x2d/0x70 [ 780.551319][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.551322][ C1] RIP: 0033:0x441739 [ 780.551334][ 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 [ 780.551339][ C1] RSP: 002b:00007fffda26abb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 780.551349][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441739 [ 780.551355][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 780.551361][ C1] RBP: 00007fffda26abc0 R08: 0000000120080522 R09: 0000000120080522 [ 780.551366][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2a70 [ 780.551372][ C1] R13: 0000000000402610 R14: 0000000000000000 R15: 0000000000000000 [ 780.551379][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 780.615439][ T1174] Kernel panic - not syncing: hung_task: blocked tasks [ 781.248339][ T1174] CPU: 0 PID: 1174 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 781.256574][ T1174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 781.266634][ T1174] Call Trace: [ 781.269958][ T1174] dump_stack+0x198/0x1fd [ 781.274313][ T1174] panic+0x382/0x7fb [ 781.278209][ T1174] ? __warn_printk+0xf3/0xf3 [ 781.282807][ T1174] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 781.288537][ T1174] ? preempt_schedule_thunk+0x16/0x18 [ 781.293910][ T1174] ? watchdog.cold+0x5/0x16b [ 781.298506][ T1174] ? watchdog+0xa82/0x1000 [ 781.302930][ T1174] watchdog.cold+0x16/0x16b [ 781.307468][ T1174] ? reset_hung_task_detector+0x30/0x30 [ 781.313019][ T1174] kthread+0x3b5/0x4a0 [ 781.317096][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 781.322212][ T1174] ret_from_fork+0x1f/0x30 [ 781.328100][ T1174] Kernel Offset: disabled [ 781.332442][ T1174] Rebooting in 86400 seconds..