[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.228' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 509.697417][ T6870] IPVS: ftp: loaded support on port[0] = 21 executing program [ 509.737995][ T6892] netlink: 388 bytes leftover after parsing attributes in process `syz-executor833'. [ 509.755206][ T6893] netlink: 388 bytes leftover after parsing attributes in process `syz-executor833'. [ 780.076642][ T1133] INFO: task kworker/0:1:6862 blocked for more than 143 seconds. [ 780.084502][ T1133] Not tainted 5.9.0-rc8-syzkaller #0 [ 780.092463][ T1133] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 780.101989][ T1133] task:kworker/0:1 state:D stack:29856 pid: 6862 ppid: 2 flags:0x00004000 [ 780.112107][ T1133] Workqueue: ipv6_addrconf addrconf_verify_work [ 780.119247][ T1133] Call Trace: [ 780.122577][ T1133] __schedule+0xec9/0x2280 [ 780.128198][ T1133] ? io_schedule_timeout+0x140/0x140 [ 780.133494][ T1133] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 780.140985][ T1133] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.146231][ T1133] ? lockdep_hardirqs_on+0x53/0x100 [ 780.152686][ T1133] schedule+0xd0/0x2a0 [ 780.157664][ T1133] schedule_preempt_disabled+0xf/0x20 [ 780.163058][ T1133] __mutex_lock+0x3e2/0x10e0 [ 780.168922][ T1133] ? addrconf_verify_work+0xa/0x20 [ 780.174894][ T1133] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.182615][ T1133] ? lock_release+0x8f0/0x8f0 [ 780.189195][ T1133] ? lock_downgrade+0x830/0x830 [ 780.194066][ T1133] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.200538][ T1133] ? lock_is_held_type+0xbb/0xf0 [ 780.205491][ T1133] addrconf_verify_work+0xa/0x20 [ 780.211672][ T1133] process_one_work+0x94c/0x1670 [ 780.217489][ T1133] ? lock_release+0x8f0/0x8f0 [ 780.222876][ T1133] ? pwq_dec_nr_in_flight+0x320/0x320 [ 780.229550][ T1133] ? rwlock_bug.part.0+0x90/0x90 [ 780.234502][ T1133] ? lockdep_hardirqs_off+0x96/0xd0 [ 780.241216][ T1133] worker_thread+0x64c/0x1120 [ 780.245919][ T1133] ? __kthread_parkme+0x13f/0x1e0 [ 780.252223][ T1133] ? process_one_work+0x1670/0x1670 [ 780.258346][ T1133] kthread+0x3b5/0x4a0 [ 780.262429][ T1133] ? __kthread_bind_mask+0xc0/0xc0 [ 780.268888][ T1133] ret_from_fork+0x1f/0x30 [ 780.273405][ T1133] [ 780.273405][ T1133] Showing all locks held in the system: [ 780.282581][ T1133] 1 lock held by khungtaskd/1133: [ 780.288547][ T1133] #0: ffffffff8a068480 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 780.300179][ T1133] 1 lock held by in:imklog/6616: [ 780.305123][ T1133] #0: ffff8880a74e9b70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 780.316122][ T1133] 3 locks held by kworker/0:1/6862: [ 780.323324][ T1133] #0: ffff888099c9d138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 780.335174][ T1133] #1: ffffc900054d7da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 780.346774][ T1133] #2: ffffffff8b17bd08 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 780.356187][ T1133] 1 lock held by syz-executor833/6893: [ 780.363149][ T1133] [ 780.365478][ T1133] ============================================= [ 780.365478][ T1133] [ 780.375087][ T1133] NMI backtrace for cpu 0 [ 780.379547][ T1133] CPU: 0 PID: 1133 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 780.387778][ T1133] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.399647][ T1133] Call Trace: [ 780.403001][ T1133] dump_stack+0x198/0x1fd [ 780.407363][ T1133] nmi_cpu_backtrace.cold+0x70/0xb1 [ 780.412656][ T1133] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 780.418289][ T1133] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 780.424269][ T1133] watchdog+0xd7d/0x1000 [ 780.428510][ T1133] ? reset_hung_task_detector+0x30/0x30 [ 780.434053][ T1133] kthread+0x3b5/0x4a0 [ 780.438378][ T1133] ? __kthread_bind_mask+0xc0/0xc0 [ 780.443490][ T1133] ret_from_fork+0x1f/0x30 [ 780.448107][ T1133] Sending NMI from CPU 0 to CPUs 1: [ 780.454603][ C1] NMI backtrace for cpu 1 [ 780.454617][ C1] CPU: 1 PID: 6893 Comm: syz-executor833 Not tainted 5.9.0-rc8-syzkaller #0 [ 780.454624][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.454628][ C1] RIP: 0010:__mutex_lock+0x11c/0x10e0 [ 780.454640][ C1] Code: 3c 02 00 0f 85 fb 0e 00 00 48 3b 6d 60 0f 85 72 09 00 00 bf 01 00 00 00 e8 c1 dc 17 f9 48 8d 45 68 31 d2 31 c9 48 89 44 24 40 <48> 89 c7 49 89 d9 44 89 e6 ff 74 24 20 41 b8 01 00 00 00 e8 6c dd [ 780.454644][ C1] RSP: 0018:ffffc90005376c90 EFLAGS: 00000246 [ 780.454653][ C1] RAX: ffff88809d968268 RBX: 0000000000000000 RCX: 0000000000000000 [ 780.454659][ C1] RDX: 0000000000000000 RSI: ffffffff8a0683c0 RDI: ffff888092c67380 [ 780.454664][ C1] RBP: ffff88809d968200 R08: ffffffff86981fb8 R09: ffff88809d968207 [ 780.454669][ C1] R10: ffffed1013b2d040 R11: 0000000000000000 R12: 0000000000000000 [ 780.454675][ C1] R13: dffffc0000000000 R14: ffff88809d968200 R15: ffff88809d968290 [ 780.454681][ C1] FS: 0000000001bd5880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 780.454686][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 780.454691][ C1] CR2: 00007f53746be000 CR3: 000000009de21000 CR4: 00000000001506e0 [ 780.454697][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 780.454702][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 780.454705][ C1] Call Trace: [ 780.454709][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 780.454713][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.454718][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 780.454722][ C1] ? wait_for_completion+0x260/0x260 [ 780.454725][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 780.454729][ C1] tcf_police_init+0x347/0x13a0 [ 780.454733][ C1] ? tcf_police_cleanup+0x60/0x60 [ 780.454737][ C1] ? find_held_lock+0x2d/0x110 [ 780.454741][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 780.454745][ C1] tcf_action_init_1+0x1a3/0x990 [ 780.454749][ C1] ? tcf_action_dump_old+0x80/0x80 [ 780.454753][ C1] ? lock_acquire+0x1f3/0xaf0 [ 780.454757][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.454760][ C1] ? find_held_lock+0x2d/0x110 [ 780.454764][ C1] ? fs_reclaim_release+0x90/0xd0 [ 780.454768][ C1] ? mark_lock+0x82/0x1660 [ 780.454772][ C1] tcf_exts_validate+0x138/0x420 [ 780.454776][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 780.454780][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 780.454784][ C1] ? __nla_parse+0x3d/0x4a [ 780.454787][ C1] route4_change+0x6d8/0x2380 [ 780.454791][ C1] ? route4_delete+0xb70/0xb70 [ 780.454795][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.454799][ C1] tc_new_tfilter+0x1398/0x2130 [ 780.454803][ C1] ? route4_delete+0xb70/0xb70 [ 780.454807][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.454811][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.454816][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.454819][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.454823][ C1] ? security_capable+0x8f/0xc0 [ 780.454827][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.454831][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.454835][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 780.454839][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 780.454843][ C1] ? lock_acquire+0x1f3/0xaf0 [ 780.454847][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 780.454851][ C1] netlink_rcv_skb+0x15a/0x430 [ 780.454855][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 780.454859][ C1] ? netlink_ack+0xa10/0xa10 [ 780.454863][ C1] ? __kmalloc_node_track_caller+0x38/0x60 [ 780.454867][ C1] netlink_unicast+0x533/0x7d0 [ 780.454871][ C1] ? netlink_attachskb+0x810/0x810 [ 780.454875][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 780.454879][ C1] ? __check_object_size+0x171/0x3e4 [ 780.454883][ C1] netlink_sendmsg+0x856/0xd90 [ 780.454887][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 780.454891][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 780.454895][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 780.454898][ C1] sock_sendmsg+0xcf/0x120 [ 780.454902][ C1] ____sys_sendmsg+0x331/0x810 [ 780.454906][ C1] ? kernel_sendmsg+0x50/0x50 [ 780.454909][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 780.454913][ C1] ? sock_alloc_file+0x4f/0x190 [ 780.454917][ C1] ? __lock_acquire+0x164a/0x5780 [ 780.454921][ C1] ___sys_sendmsg+0xf3/0x170 [ 780.454925][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 780.454930][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.454934][ C1] ? fs_reclaim_release+0x90/0xd0 [ 780.454937][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.454941][ C1] ? find_held_lock+0x2d/0x110 [ 780.454945][ C1] ? __might_fault+0x11f/0x1d0 [ 780.454949][ C1] ? lock_downgrade+0x830/0x830 [ 780.454953][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.454957][ C1] __sys_sendmmsg+0x195/0x480 [ 780.454961][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 780.454964][ C1] ? find_held_lock+0x2d/0x110 [ 780.454968][ C1] ? __fd_install+0x1b4/0x600 [ 780.454972][ C1] ? alloc_file_pseudo+0x1/0x250 [ 780.454976][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.454980][ C1] ? __fd_install+0x1e6/0x600 [ 780.454983][ C1] ? __sys_socket+0x16d/0x200 [ 780.454987][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.454992][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 780.454996][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 780.455000][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 780.455004][ C1] do_syscall_64+0x2d/0x70 [ 780.455008][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.455011][ C1] RIP: 0033:0x441599 [ 780.455023][ 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 [ 780.455027][ C1] RSP: 002b:00007ffc72b39eb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 780.455037][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441599 [ 780.455042][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 780.455048][ C1] RBP: 00007ffc72b39ec0 R08: 0000000100000000 R09: 0000000100000000 [ 780.455053][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000007c727 [ 780.455058][ C1] R13: 0000000000402470 R14: 0000000000000000 R15: 0000000000000000 [ 780.455065][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 780.466352][ T1133] Kernel panic - not syncing: hung_task: blocked tasks [ 781.063743][ T1133] CPU: 0 PID: 1133 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 781.071977][ T1133] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 781.082030][ T1133] Call Trace: [ 781.085329][ T1133] dump_stack+0x198/0x1fd [ 781.089665][ T1133] panic+0x382/0x7fb [ 781.093562][ T1133] ? __warn_printk+0xf3/0xf3 [ 781.098164][ T1133] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 781.103798][ T1133] ? preempt_schedule_thunk+0x16/0x18 [ 781.109173][ T1133] ? watchdog.cold+0x5/0x16b [ 781.113759][ T1133] ? watchdog+0xa82/0x1000 [ 781.118181][ T1133] watchdog.cold+0x16/0x16b [ 781.122684][ T1133] ? reset_hung_task_detector+0x30/0x30 [ 781.128230][ T1133] kthread+0x3b5/0x4a0 [ 781.132296][ T1133] ? __kthread_bind_mask+0xc0/0xc0 [ 781.137406][ T1133] ret_from_fork+0x1f/0x30 [ 781.143132][ T1133] Kernel Offset: disabled [ 781.147511][ T1133] Rebooting in 86400 seconds..