[ 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 '10.128.0.29' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 498.329537][ T6871] IPVS: ftp: loaded support on port[0] = 21 [ 498.370857][ T6892] netlink: 8 bytes leftover after parsing attributes in process `syz-executor638'. [ 498.380437][ T6892] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor638'. [ 498.392763][ T6892] netlink: 8 bytes leftover after parsing attributes in process `syz-executor638'. [ 498.402681][ T6892] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor638'. [ 657.187212][ T1170] INFO: task kworker/0:2:2473 blocked for more than 143 seconds. [ 657.195054][ T1170] Not tainted 5.9.0-rc6-syzkaller #0 [ 657.204228][ T1170] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.213709][ T1170] task:kworker/0:2 state:D stack:28664 pid: 2473 ppid: 2 flags:0x00004000 [ 657.223834][ T1170] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.230959][ T1170] Call Trace: [ 657.234276][ T1170] __schedule+0xec9/0x2280 [ 657.239955][ T1170] ? io_schedule_timeout+0x140/0x140 [ 657.245282][ T1170] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.252649][ T1170] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.258662][ T1170] ? lockdep_hardirqs_on+0x53/0x100 [ 657.263895][ T1170] schedule+0xd0/0x2a0 [ 657.269229][ T1170] schedule_preempt_disabled+0xf/0x20 [ 657.276336][ T1170] __mutex_lock+0x3e2/0x10e0 [ 657.282335][ T1170] ? addrconf_verify_work+0xa/0x20 [ 657.288308][ T1170] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.293690][ T1170] ? lock_release+0x8f0/0x8f0 [ 657.299617][ T1170] ? lock_downgrade+0x830/0x830 [ 657.304479][ T1170] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.311150][ T1170] ? lock_is_held_type+0xbb/0xf0 [ 657.316097][ T1170] addrconf_verify_work+0xa/0x20 [ 657.322252][ T1170] process_one_work+0x94c/0x1670 [ 657.329208][ T1170] ? lock_release+0x8f0/0x8f0 [ 657.333915][ T1170] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.340503][ T1170] ? rwlock_bug.part.0+0x90/0x90 [ 657.345455][ T1170] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.351920][ T1170] worker_thread+0x64c/0x1120 [ 657.356616][ T1170] ? __kthread_parkme+0x13f/0x1e0 [ 657.362820][ T1170] ? process_one_work+0x1670/0x1670 [ 657.368925][ T1170] kthread+0x3b5/0x4a0 [ 657.373000][ T1170] ? __kthread_bind_mask+0xc0/0xc0 [ 657.379304][ T1170] ret_from_fork+0x1f/0x30 [ 657.383854][ T1170] [ 657.383854][ T1170] Showing all locks held in the system: [ 657.392856][ T1170] 1 lock held by khungtaskd/1170: [ 657.399697][ T1170] #0: ffffffff8a067f00 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.411033][ T1170] 3 locks held by kworker/0:2/2473: [ 657.416230][ T1170] #0: ffff888099987538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.428872][ T1170] #1: ffffc9000876fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.440658][ T1170] #2: ffffffff8b14d548 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.450924][ T1170] 1 lock held by in:imklog/6562: [ 657.455860][ T1170] #0: ffff8880948913f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.467649][ T1170] 1 lock held by syz-executor638/6892: [ 657.473130][ T1170] [ 657.475452][ T1170] ============================================= [ 657.475452][ T1170] [ 657.485614][ T1170] NMI backtrace for cpu 0 [ 657.490064][ T1170] CPU: 0 PID: 1170 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 657.498293][ T1170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.508342][ T1170] Call Trace: [ 657.511731][ T1170] dump_stack+0x198/0x1fd [ 657.516067][ T1170] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.521269][ T1170] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.526907][ T1170] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.532913][ T1170] watchdog+0xd7d/0x1000 [ 657.537159][ T1170] ? reset_hung_task_detector+0x30/0x30 [ 657.542712][ T1170] kthread+0x3b5/0x4a0 [ 657.546781][ T1170] ? __kthread_bind_mask+0xc0/0xc0 [ 657.551902][ T1170] ret_from_fork+0x1f/0x30 [ 657.556552][ T1170] Sending NMI from CPU 0 to CPUs 1: [ 657.563185][ C1] NMI backtrace for cpu 1 [ 657.563192][ C1] CPU: 1 PID: 6892 Comm: syz-executor638 Not tainted 5.9.0-rc6-syzkaller #0 [ 657.563198][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.563202][ C1] RIP: 0010:__might_sleep+0x15/0x190 [ 657.563214][ C1] Code: 61 a9 65 00 e9 90 fe ff ff e8 47 a9 65 00 e9 18 ff ff ff 66 90 48 b8 00 00 00 00 00 fc ff df 41 55 41 89 d5 41 54 41 89 f4 55 <48> 89 fd 53 65 48 8b 1c 25 c0 fe 01 00 48 8d 7b 10 48 83 ec 10 48 [ 657.563219][ C1] RSP: 0018:ffffc90006066bc0 EFLAGS: 00000246 [ 657.563227][ C1] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 657.563233][ C1] RDX: 0000000000000000 RSI: 00000000000003a7 RDI: ffffffff888bc5c0 [ 657.563238][ C1] RBP: ffff8880a724e000 R08: ffffffff868a93f8 R09: ffff8880a724e007 [ 657.563243][ C1] R10: ffffed1014e49c00 R11: 0000000000000000 R12: 00000000000003a7 [ 657.563249][ C1] R13: 0000000000000000 R14: ffff8880a724e000 R15: ffff8880a724e090 [ 657.563255][ C1] FS: 0000000001a93880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 657.563259][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.563265][ C1] CR2: 00007f7250f57000 CR3: 00000000a0533000 CR4: 00000000001506e0 [ 657.563270][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.563275][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.563278][ C1] Call Trace: [ 657.563282][ C1] __mutex_lock+0xa9/0x10e0 [ 657.563286][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.563291][ C1] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 657.563295][ C1] ? check_preemption_disabled+0x50/0x130 [ 657.563299][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.563303][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 657.563307][ C1] ? wait_for_completion+0x260/0x260 [ 657.563311][ C1] ? __radix_tree_lookup+0x179/0x290 [ 657.563315][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 657.563319][ C1] tcf_police_init+0x347/0x13a0 [ 657.563323][ C1] ? tcf_police_cleanup+0x60/0x60 [ 657.563326][ C1] ? find_held_lock+0x2d/0x110 [ 657.563330][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 657.563334][ C1] tcf_action_init_1+0x1a3/0x990 [ 657.563338][ C1] ? tcf_action_dump_old+0x80/0x80 [ 657.563342][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.563345][ C1] ? find_held_lock+0x2d/0x110 [ 657.563349][ C1] ? cache_alloc_refill+0x1e7/0x380 [ 657.563353][ C1] ? lock_downgrade+0x830/0x830 [ 657.563357][ C1] ? mark_lock+0x82/0x1660 [ 657.563361][ C1] tcf_exts_validate+0x138/0x420 [ 657.563365][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 657.563369][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 657.563372][ C1] ? __nla_parse+0x3d/0x4a [ 657.563376][ C1] rsvp_change+0x291/0x2990 [ 657.563380][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.563384][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.563387][ C1] ? find_held_lock+0x2d/0x110 [ 657.563391][ C1] ? tc_new_tfilter+0x1be4/0x2130 [ 657.563396][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.563399][ C1] ? lock_downgrade+0x830/0x830 [ 657.563403][ C1] ? blackhole_dequeue+0x10/0x10 [ 657.563407][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.563411][ C1] tc_new_tfilter+0x1398/0x2130 [ 657.563415][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.563419][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.563423][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.563427][ C1] ? is_bpf_text_address+0xcb/0x160 [ 657.563431][ C1] ? kernel_text_address+0xbd/0xf0 [ 657.563435][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.563439][ C1] ? security_capable+0x8f/0xc0 [ 657.563443][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.563447][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.563451][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 657.563455][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.563459][ C1] ? lock_acquire+0x1f3/0xaf0 [ 657.563463][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 657.563467][ C1] netlink_rcv_skb+0x15a/0x430 [ 657.563471][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.563475][ C1] ? netlink_ack+0xa10/0xa10 [ 657.563478][ C1] netlink_unicast+0x533/0x7d0 [ 657.563482][ C1] ? netlink_attachskb+0x810/0x810 [ 657.563486][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 657.563490][ C1] ? __check_object_size+0x171/0x3e4 [ 657.563494][ C1] netlink_sendmsg+0x856/0xd90 [ 657.563498][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.563502][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 657.563506][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.563510][ C1] sock_sendmsg+0xcf/0x120 [ 657.563513][ C1] ____sys_sendmsg+0x331/0x810 [ 657.563517][ C1] ? kernel_sendmsg+0x50/0x50 [ 657.563521][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 657.563525][ C1] ? sock_alloc_file+0x4f/0x190 [ 657.563529][ C1] ? __lock_acquire+0x164a/0x5780 [ 657.563532][ C1] ___sys_sendmsg+0xf3/0x170 [ 657.563536][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 657.563541][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.563545][ C1] ? fs_reclaim_release+0x90/0xd0 [ 657.563549][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.563552][ C1] ? find_held_lock+0x2d/0x110 [ 657.563556][ C1] ? __might_fault+0x11f/0x1d0 [ 657.563560][ C1] ? lock_downgrade+0x830/0x830 [ 657.563564][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.563568][ C1] __sys_sendmmsg+0x195/0x480 [ 657.563572][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 657.563575][ C1] ? find_held_lock+0x2d/0x110 [ 657.563579][ C1] ? __fd_install+0x1b4/0x600 [ 657.563583][ C1] ? alloc_file_pseudo+0x1/0x250 [ 657.563587][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.563591][ C1] ? __fd_install+0x1e6/0x600 [ 657.563594][ C1] ? __sys_socket+0x16d/0x200 [ 657.563598][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.563602][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.563606][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 657.563611][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.563614][ C1] do_syscall_64+0x2d/0x70 [ 657.563619][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.563622][ C1] RIP: 0033:0x441599 [ 657.563633][ 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 [ 657.563638][ C1] RSP: 002b:00007ffcd982bc08 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 657.563647][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441599 [ 657.563653][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 657.563658][ C1] RBP: 00007ffcd982bc10 R08: 0000000120080522 R09: 0000000120080522 [ 657.563663][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a3bb0 [ 657.563669][ C1] R13: 0000000000402470 R14: 0000000000000000 R15: 0000000000000000 [ 657.563675][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 657.569321][ T1170] Kernel panic - not syncing: hung_task: blocked tasks [ 658.225966][ T1170] CPU: 0 PID: 1170 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 658.234196][ T1170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.244244][ T1170] Call Trace: [ 658.247540][ T1170] dump_stack+0x198/0x1fd [ 658.251872][ T1170] panic+0x382/0x7fb [ 658.255764][ T1170] ? __warn_printk+0xf3/0xf3 [ 658.260355][ T1170] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.265978][ T1170] ? preempt_schedule_thunk+0x16/0x18 [ 658.271350][ T1170] ? watchdog.cold+0x5/0x16b [ 658.275930][ T1170] ? watchdog+0xa82/0x1000 [ 658.280348][ T1170] watchdog.cold+0x16/0x16b [ 658.284850][ T1170] ? reset_hung_task_detector+0x30/0x30 [ 658.290397][ T1170] kthread+0x3b5/0x4a0 [ 658.294467][ T1170] ? __kthread_bind_mask+0xc0/0xc0 [ 658.299575][ T1170] ret_from_fork+0x1f/0x30 [ 658.305243][ T1170] Kernel Offset: disabled [ 658.309594][ T1170] Rebooting in 86400 seconds..