[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.12' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 492.854546][ T6873] IPVS: ftp: loaded support on port[0] = 21 [ 657.312719][ T1177] INFO: task kworker/0:1:6865 blocked for more than 143 seconds. [ 657.320646][ T1177] Not tainted 5.9.0-rc6-syzkaller #0 [ 657.331248][ T1177] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.340647][ T1177] task:kworker/0:1 state:D stack:29440 pid: 6865 ppid: 2 flags:0x00004000 [ 657.350711][ T1177] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.357736][ T1177] Call Trace: [ 657.361102][ T1177] __schedule+0xec9/0x2280 [ 657.366615][ T1177] ? io_schedule_timeout+0x140/0x140 [ 657.371950][ T1177] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.379082][ T1177] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.385021][ T1177] ? lockdep_hardirqs_on+0x53/0x100 [ 657.390253][ T1177] schedule+0xd0/0x2a0 [ 657.395482][ T1177] schedule_preempt_disabled+0xf/0x20 [ 657.400874][ T1177] __mutex_lock+0x3e2/0x10e0 [ 657.406637][ T1177] ? addrconf_verify_work+0xa/0x20 [ 657.411764][ T1177] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.418306][ T1177] ? lock_release+0x8f0/0x8f0 [ 657.423647][ T1177] ? lock_downgrade+0x830/0x830 [ 657.428548][ T1177] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.434868][ T1177] ? lock_is_held_type+0xbb/0xf0 [ 657.439819][ T1177] addrconf_verify_work+0xa/0x20 [ 657.446905][ T1177] process_one_work+0x94c/0x1670 [ 657.451862][ T1177] ? lock_release+0x8f0/0x8f0 [ 657.459057][ T1177] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.465345][ T1177] ? rwlock_bug.part.0+0x90/0x90 [ 657.470292][ T1177] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.476662][ T1177] worker_thread+0x64c/0x1120 [ 657.481360][ T1177] ? __kthread_parkme+0x13f/0x1e0 [ 657.487516][ T1177] ? process_one_work+0x1670/0x1670 [ 657.493433][ T1177] kthread+0x3b5/0x4a0 [ 657.497509][ T1177] ? __kthread_bind_mask+0xc0/0xc0 [ 657.503790][ T1177] ret_from_fork+0x1f/0x30 [ 657.508299][ T1177] [ 657.508299][ T1177] Showing all locks held in the system: [ 657.517224][ T1177] 1 lock held by khungtaskd/1177: [ 657.522243][ T1177] #0: ffffffff8a067f00 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.534087][ T1177] 1 lock held by in:imklog/6567: [ 657.539039][ T1177] #0: ffff8880a5fa05f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.549236][ T1177] 3 locks held by kworker/0:1/6865: [ 657.555521][ T1177] #0: ffff888214ecfd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.567149][ T1177] #1: ffffc900062afda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.578320][ T1177] #2: ffffffff8b14d648 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.589567][ T1177] 1 lock held by syz-executor016/6894: [ 657.595743][ T1177] [ 657.598071][ T1177] ============================================= [ 657.598071][ T1177] [ 657.607543][ T1177] NMI backtrace for cpu 0 [ 657.611882][ T1177] CPU: 0 PID: 1177 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 657.620104][ T1177] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.630146][ T1177] Call Trace: [ 657.633515][ T1177] dump_stack+0x198/0x1fd [ 657.637847][ T1177] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.643056][ T1177] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.648720][ T1177] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.654733][ T1177] watchdog+0xd7d/0x1000 [ 657.658974][ T1177] ? reset_hung_task_detector+0x30/0x30 [ 657.664510][ T1177] kthread+0x3b5/0x4a0 [ 657.668575][ T1177] ? __kthread_bind_mask+0xc0/0xc0 [ 657.673685][ T1177] ret_from_fork+0x1f/0x30 [ 657.678243][ T1177] Sending NMI from CPU 0 to CPUs 1: [ 657.684918][ C1] NMI backtrace for cpu 1 [ 657.684924][ C1] CPU: 1 PID: 6894 Comm: syz-executor016 Not tainted 5.9.0-rc6-syzkaller #0 [ 657.684931][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.684936][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x30/0x60 [ 657.684947][ C1] Code: fe 01 00 65 8b 05 30 c0 8b 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 2c 14 00 00 85 c0 74 2b 8b 82 08 14 00 00 <83> f8 02 75 20 48 8b 8a 10 14 00 00 8b 92 0c 14 00 00 48 8b 01 48 [ 657.684952][ C1] RSP: 0018:ffffc900043c6cd0 EFLAGS: 00000246 [ 657.684959][ C1] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 [ 657.684964][ C1] RDX: ffff888093678500 RSI: ffffffff83d84221 RDI: ffff8880a1655690 [ 657.684969][ C1] RBP: 00000000f0000000 R08: 0000000000000000 R09: ffff8880a1655607 [ 657.684974][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: ffffc900043c6f80 [ 657.684978][ C1] R13: 0000000000000001 R14: ffff8880a1655600 R15: ffff8880a1655690 [ 657.684984][ C1] FS: 00000000021c9880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 657.684989][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.684999][ C1] CR2: 00000000006cd080 CR3: 000000009e5f4000 CR4: 00000000001506e0 [ 657.685005][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.685010][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.685013][ C1] Call Trace: [ 657.685017][ C1] __radix_tree_lookup+0x81/0x290 [ 657.685021][ C1] tcf_idr_check_alloc+0xb0/0x3b0 [ 657.685025][ C1] tcf_police_init+0x347/0x13a0 [ 657.685029][ C1] ? tcf_police_cleanup+0x60/0x60 [ 657.685033][ C1] ? find_held_lock+0x2d/0x110 [ 657.685037][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 657.685041][ C1] ? mark_held_locks+0x9f/0xe0 [ 657.685045][ C1] ? check_preemption_disabled+0x50/0x130 [ 657.685049][ C1] tcf_action_init_1+0x1a3/0x990 [ 657.685053][ C1] ? tcf_action_dump_old+0x80/0x80 [ 657.685057][ C1] ? kasan_save_stack+0x32/0x40 [ 657.685061][ C1] ? kasan_save_stack+0x1b/0x40 [ 657.685065][ C1] ? __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 657.685069][ C1] ? kmem_cache_alloc_trace+0x174/0x300 [ 657.685073][ C1] ? fw_change+0x4b5/0x13e0 [ 657.685077][ C1] ? tc_new_tfilter+0x1398/0x2130 [ 657.685081][ C1] ? rtnetlink_rcv_msg+0x80f/0xad0 [ 657.685085][ C1] ? netlink_rcv_skb+0x15a/0x430 [ 657.685089][ C1] ? netlink_unicast+0x533/0x7d0 [ 657.685093][ C1] ? netlink_sendmsg+0x856/0xd90 [ 657.685097][ C1] ? sock_sendmsg+0xcf/0x120 [ 657.685100][ C1] ? ____sys_sendmsg+0x331/0x810 [ 657.685104][ C1] ? ___sys_sendmsg+0xf3/0x170 [ 657.685108][ C1] ? __sys_sendmmsg+0x195/0x480 [ 657.685112][ C1] ? __x64_sys_sendmmsg+0x99/0x100 [ 657.685116][ C1] ? do_syscall_64+0x2d/0x70 [ 657.685120][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.685124][ C1] tcf_exts_validate+0x138/0x420 [ 657.685128][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 657.685132][ C1] ? mark_lock+0x82/0x1660 [ 657.685135][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.685139][ C1] fw_set_parms+0x13d/0xa30 [ 657.685143][ C1] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 657.685147][ C1] ? fw_delete+0x8c0/0x8c0 [ 657.685151][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 657.685155][ C1] ? __nla_parse+0x3d/0x4a [ 657.685159][ C1] fw_change+0x57e/0x13e0 [ 657.685162][ C1] ? lock_downgrade+0x830/0x830 [ 657.685166][ C1] ? fw_set_parms+0xa30/0xa30 [ 657.685170][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.685174][ C1] tc_new_tfilter+0x1398/0x2130 [ 657.685178][ C1] ? fw_set_parms+0xa30/0xa30 [ 657.685182][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.685186][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.685190][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.685194][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.685203][ C1] ? security_capable+0x8f/0xc0 [ 657.685207][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.685211][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.685215][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 657.685219][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.685223][ C1] ? lock_acquire+0x1f3/0xaf0 [ 657.685227][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 657.685231][ C1] netlink_rcv_skb+0x15a/0x430 [ 657.685235][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.685239][ C1] ? netlink_ack+0xa10/0xa10 [ 657.685243][ C1] ? __kmalloc_node_track_caller+0x38/0x60 [ 657.685247][ C1] netlink_unicast+0x533/0x7d0 [ 657.685251][ C1] ? netlink_attachskb+0x810/0x810 [ 657.685255][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 657.685259][ C1] ? __check_object_size+0x171/0x3e4 [ 657.685263][ C1] netlink_sendmsg+0x856/0xd90 [ 657.685267][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.685271][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 657.685275][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.685279][ C1] sock_sendmsg+0xcf/0x120 [ 657.685283][ C1] ____sys_sendmsg+0x331/0x810 [ 657.685286][ C1] ? kernel_sendmsg+0x50/0x50 [ 657.685290][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 657.685294][ C1] ? __lock_acquire+0x164a/0x5780 [ 657.685298][ C1] ___sys_sendmsg+0xf3/0x170 [ 657.685302][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 657.685306][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.685310][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.685314][ C1] ? find_held_lock+0x2d/0x110 [ 657.685318][ C1] ? __might_fault+0x11f/0x1d0 [ 657.685322][ C1] ? lock_downgrade+0x830/0x830 [ 657.685325][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.685329][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.685333][ C1] __sys_sendmmsg+0x195/0x480 [ 657.685337][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 657.685341][ C1] ? __might_fault+0x190/0x1d0 [ 657.685344][ C1] ? _copy_to_user+0x126/0x160 [ 657.685349][ C1] ? sockfd_lookup_light+0xc6/0x180 [ 657.685352][ C1] ? __sys_sendmsg+0x10c/0x1b0 [ 657.685356][ C1] ? __sys_sendmsg_sock+0xb0/0xb0 [ 657.685360][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.685364][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.685368][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 657.685373][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.685376][ C1] do_syscall_64+0x2d/0x70 [ 657.685381][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.685384][ C1] RIP: 0033:0x441579 [ 657.685395][ 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 [ 657.685400][ C1] RSP: 002b:00007ffc588afd18 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 657.685409][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441579 [ 657.685415][ C1] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 657.685420][ C1] RBP: 00007ffc588afd20 R08: 0000000120080522 R09: 0000000120080522 [ 657.685426][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2930 [ 657.685431][ C1] R13: 0000000000402450 R14: 0000000000000000 R15: 0000000000000000 [ 657.685437][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 657.702629][ T1177] Kernel panic - not syncing: hung_task: blocked tasks [ 658.368345][ T1177] CPU: 0 PID: 1177 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 658.376568][ T1177] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.386612][ T1177] Call Trace: [ 658.389907][ T1177] dump_stack+0x198/0x1fd [ 658.394238][ T1177] panic+0x382/0x7fb [ 658.398130][ T1177] ? __warn_printk+0xf3/0xf3 [ 658.402728][ T1177] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.408352][ T1177] ? preempt_schedule_thunk+0x16/0x18 [ 658.413725][ T1177] ? watchdog.cold+0x5/0x16b [ 658.418309][ T1177] ? watchdog+0xa82/0x1000 [ 658.422725][ T1177] watchdog.cold+0x16/0x16b [ 658.427226][ T1177] ? reset_hung_task_detector+0x30/0x30 [ 658.432776][ T1177] kthread+0x3b5/0x4a0 [ 658.436844][ T1177] ? __kthread_bind_mask+0xc0/0xc0 [ 658.441953][ T1177] ret_from_fork+0x1f/0x30 [ 658.447717][ T1177] Kernel Offset: disabled [ 658.452039][ T1177] Rebooting in 86400 seconds..