Warning: Permanently added '10.128.1.21' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 622.473271][ T6901] IPVS: ftp: loaded support on port[0] = 21 [ 780.227124][ T1158] INFO: task kworker/0:2:2473 blocked for more than 143 seconds. [ 780.235075][ T1158] Not tainted 5.9.0-rc8-syzkaller #0 [ 780.244004][ T1158] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 780.253347][ T1158] task:kworker/0:2 state:D stack:27056 pid: 2473 ppid: 2 flags:0x00004000 [ 780.264430][ T1158] Workqueue: ipv6_addrconf addrconf_verify_work [ 780.271417][ T1158] Call Trace: [ 780.274742][ T1158] __schedule+0xec9/0x2280 [ 780.280113][ T1158] ? io_schedule_timeout+0x140/0x140 [ 780.285498][ T1158] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 780.292621][ T1158] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.298422][ T1158] ? lockdep_hardirqs_on+0x53/0x100 [ 780.303624][ T1158] schedule+0xd0/0x2a0 [ 780.308674][ T1158] schedule_preempt_disabled+0xf/0x20 [ 780.314044][ T1158] __mutex_lock+0x3e2/0x10e0 [ 780.319629][ T1158] ? addrconf_verify_work+0xa/0x20 [ 780.324748][ T1158] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.331221][ T1158] ? lock_release+0x8f0/0x8f0 [ 780.335899][ T1158] ? lock_downgrade+0x830/0x830 [ 780.341744][ T1158] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.347565][ T1158] ? lock_is_held_type+0xbb/0xf0 [ 780.352519][ T1158] addrconf_verify_work+0xa/0x20 [ 780.358508][ T1158] process_one_work+0x94c/0x1670 [ 780.363463][ T1158] ? lock_release+0x8f0/0x8f0 [ 780.369200][ T1158] ? pwq_dec_nr_in_flight+0x320/0x320 [ 780.374580][ T1158] ? rwlock_bug.part.0+0x90/0x90 [ 780.380526][ T1158] ? lockdep_hardirqs_off+0x96/0xd0 [ 780.385738][ T1158] worker_thread+0x64c/0x1120 [ 780.392594][ T1158] ? __kthread_parkme+0x13f/0x1e0 [ 780.398186][ T1158] ? process_one_work+0x1670/0x1670 [ 780.403387][ T1158] kthread+0x3b5/0x4a0 [ 780.409157][ T1158] ? __kthread_bind_mask+0xc0/0xc0 [ 780.414384][ T1158] ret_from_fork+0x1f/0x30 [ 780.419917][ T1158] [ 780.419917][ T1158] Showing all locks held in the system: [ 780.428434][ T1158] 1 lock held by khungtaskd/1158: [ 780.433458][ T1158] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 780.445250][ T1158] 3 locks held by kworker/0:2/2473: [ 780.451089][ T1158] #0: ffff888214f96938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 780.462656][ T1158] #1: ffffc90000edfda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 780.474695][ T1158] #2: ffffffff8b14f108 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 780.484684][ T1158] 1 lock held by in:imklog/6574: [ 780.490200][ T1158] #0: ffff88809f7698f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 780.500196][ T1158] 1 lock held by syz-executor035/6922: [ 780.505672][ T1158] [ 780.509050][ T1158] ============================================= [ 780.509050][ T1158] [ 780.519142][ T1158] NMI backtrace for cpu 1 [ 780.523477][ T1158] CPU: 1 PID: 1158 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 780.531696][ T1158] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.541936][ T1158] Call Trace: [ 780.545332][ T1158] dump_stack+0x198/0x1fd [ 780.549662][ T1158] nmi_cpu_backtrace.cold+0x70/0xb1 [ 780.554907][ T1158] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 780.560537][ T1158] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 780.566541][ T1158] watchdog+0xd7d/0x1000 [ 780.570782][ T1158] ? reset_hung_task_detector+0x30/0x30 [ 780.576320][ T1158] kthread+0x3b5/0x4a0 [ 780.580382][ T1158] ? __kthread_bind_mask+0xc0/0xc0 [ 780.585492][ T1158] ret_from_fork+0x1f/0x30 [ 780.590110][ T1158] Sending NMI from CPU 1 to CPUs 0: [ 780.596782][ C0] NMI backtrace for cpu 0 [ 780.596788][ C0] CPU: 0 PID: 6922 Comm: syz-executor035 Not tainted 5.9.0-rc8-syzkaller #0 [ 780.596794][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.596798][ C0] RIP: 0010:check_memory_region+0x12b/0x180 [ 780.596808][ C0] Code: 3a 00 74 ef 49 8d 04 2c 48 85 d2 75 0b 48 89 da 48 29 c2 e9 55 ff ff ff 49 39 d2 75 17 49 0f be 02 41 83 e1 07 49 39 c1 7d 0a <5b> b8 01 00 00 00 5d 41 5c c3 44 89 c2 e8 e3 ef ff ff 5b 83 f0 01 [ 780.596812][ C0] RSP: 0018:ffffc90001a26ba8 EFLAGS: 00000246 [ 780.596819][ C0] RAX: fffffbfff16b2fda RBX: fffffbfff16b2fda RCX: ffffffff815c005f [ 780.596824][ C0] RDX: fffffbfff16b2fda RSI: 0000000000000008 RDI: ffffffff8b597ec8 [ 780.596828][ C0] RBP: fffffbfff16b2fd9 R08: 0000000000000000 R09: ffffffff8b597ecf [ 780.596833][ C0] R10: fffffbfff16b2fd9 R11: 0000000000000000 R12: ffffc90001a26f80 [ 780.596838][ C0] R13: ffff88809f086468 R14: ffffffff868adf9e R15: ffff88809f086400 [ 780.596843][ C0] FS: 000000000238c880(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 [ 780.596847][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 780.596852][ C0] CR2: 00000000006cd080 CR3: 000000009ede6000 CR4: 00000000001506f0 [ 780.596856][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 780.596861][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 780.596863][ C0] Call Trace: [ 780.596866][ C0] lock_release+0x9f/0x8f0 [ 780.596869][ C0] ? __mutex_lock+0x626/0x10e0 [ 780.596873][ C0] ? lock_downgrade+0x830/0x830 [ 780.596876][ C0] ? mark_held_locks+0x9f/0xe0 [ 780.596879][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 780.596883][ C0] ? check_preemption_disabled+0x50/0x130 [ 780.596886][ C0] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.596890][ C0] __mutex_unlock_slowpath+0x81/0x610 [ 780.596893][ C0] ? wait_for_completion+0x260/0x260 [ 780.596901][ C0] tcf_idr_check_alloc+0x29e/0x3b0 [ 780.596905][ C0] tcf_police_init+0x347/0x13a0 [ 780.596909][ C0] ? tcf_police_cleanup+0x60/0x60 [ 780.596912][ C0] ? find_held_lock+0x2d/0x110 [ 780.596916][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 780.596920][ C0] ? mark_held_locks+0x9f/0xe0 [ 780.596924][ C0] ? check_preemption_disabled+0x50/0x130 [ 780.596928][ C0] tcf_action_init_1+0x1a3/0x990 [ 780.596931][ C0] ? tcf_action_dump_old+0x80/0x80 [ 780.596935][ C0] ? kasan_save_stack+0x32/0x40 [ 780.596938][ C0] ? kasan_save_stack+0x1b/0x40 [ 780.596942][ C0] ? __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 780.596945][ C0] ? kmem_cache_alloc_trace+0x174/0x300 [ 780.596948][ C0] ? fw_change+0x4b5/0x13e0 [ 780.596951][ C0] ? tc_new_tfilter+0x1398/0x2130 [ 780.596955][ C0] ? rtnetlink_rcv_msg+0x80f/0xad0 [ 780.596958][ C0] ? netlink_rcv_skb+0x15a/0x430 [ 780.596961][ C0] ? netlink_unicast+0x533/0x7d0 [ 780.596969][ C0] ? netlink_sendmsg+0x856/0xd90 [ 780.596972][ C0] ? sock_sendmsg+0xcf/0x120 [ 780.596975][ C0] ? ____sys_sendmsg+0x331/0x810 [ 780.596979][ C0] ? ___sys_sendmsg+0xf3/0x170 [ 780.596982][ C0] ? __sys_sendmmsg+0x195/0x480 [ 780.596985][ C0] ? __x64_sys_sendmmsg+0x99/0x100 [ 780.596988][ C0] ? do_syscall_64+0x2d/0x70 [ 780.596992][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.596995][ C0] tcf_exts_validate+0x138/0x420 [ 780.596998][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 780.597001][ C0] ? mark_lock+0x82/0x1660 [ 780.597004][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.597007][ C0] fw_set_parms+0x13d/0xa30 [ 780.597011][ C0] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 780.597014][ C0] ? fw_delete+0x8c0/0x8c0 [ 780.597018][ C0] ? kmem_cache_alloc_trace+0x18e/0x300 [ 780.597021][ C0] ? __nla_parse+0x3d/0x4a [ 780.597024][ C0] fw_change+0x57e/0x13e0 [ 780.597027][ C0] ? lock_downgrade+0x830/0x830 [ 780.597030][ C0] ? fw_set_parms+0xa30/0xa30 [ 780.597033][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.597037][ C0] tc_new_tfilter+0x1398/0x2130 [ 780.597040][ C0] ? fw_set_parms+0xa30/0xa30 [ 780.597043][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.597047][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.597051][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.597054][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.597057][ C0] ? security_capable+0x8f/0xc0 [ 780.597060][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.597063][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.597067][ C0] rtnetlink_rcv_msg+0x80f/0xad0 [ 780.597070][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 780.597073][ C0] ? lock_acquire+0x1f3/0xaf0 [ 780.597077][ C0] ? netlink_deliver_tap+0x146/0xb70 [ 780.597080][ C0] netlink_rcv_skb+0x15a/0x430 [ 780.597083][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 780.597086][ C0] ? netlink_ack+0xa10/0xa10 [ 780.597090][ C0] ? __kmalloc_node_track_caller+0x38/0x60 [ 780.597093][ C0] netlink_unicast+0x533/0x7d0 [ 780.597097][ C0] ? netlink_attachskb+0x810/0x810 [ 780.597100][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 780.597103][ C0] ? __check_object_size+0x171/0x3e4 [ 780.597107][ C0] netlink_sendmsg+0x856/0xd90 [ 780.597110][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 780.597113][ C0] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 780.597117][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 780.597120][ C0] sock_sendmsg+0xcf/0x120 [ 780.597123][ C0] ____sys_sendmsg+0x331/0x810 [ 780.597126][ C0] ? kernel_sendmsg+0x50/0x50 [ 780.597129][ C0] ? do_recvmmsg+0x6d0/0x6d0 [ 780.597132][ C0] ? __lock_acquire+0x164a/0x5780 [ 780.597135][ C0] ___sys_sendmsg+0xf3/0x170 [ 780.597138][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 780.597142][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.597145][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.597148][ C0] ? find_held_lock+0x2d/0x110 [ 780.597151][ C0] ? __might_fault+0x11f/0x1d0 [ 780.597154][ C0] ? lock_downgrade+0x830/0x830 [ 780.597158][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.597161][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.597164][ C0] __sys_sendmmsg+0x195/0x480 [ 780.597167][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 780.597170][ C0] ? __might_fault+0x190/0x1d0 [ 780.597173][ C0] ? _copy_to_user+0x126/0x160 [ 780.597177][ C0] ? sockfd_lookup_light+0xc6/0x180 [ 780.597180][ C0] ? __sys_sendmsg+0x10c/0x1b0 [ 780.597183][ C0] ? __sys_sendmsg_sock+0xb0/0xb0 [ 780.597186][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.597190][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 780.597193][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 780.597197][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 780.597200][ C0] do_syscall_64+0x2d/0x70 [ 780.597203][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.597206][ C0] RIP: 0033:0x441579 [ 780.597216][ C0] 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 [ 780.597220][ C0] RSP: 002b:00007ffe52662168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 780.597228][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441579 [ 780.597232][ C0] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 780.597237][ C0] RBP: 00007ffe52662170 R08: 0000000120080522 R09: 0000000120080522 [ 780.597241][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a28f0 [ 780.597246][ C0] R13: 0000000000402450 R14: 0000000000000000 R15: 0000000000000000 [ 780.597252][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 780.616948][ T1158] Kernel panic - not syncing: hung_task: blocked tasks [ 781.321366][ T1158] CPU: 1 PID: 1158 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 781.329583][ T1158] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 781.339617][ T1158] Call Trace: [ 781.342912][ T1158] dump_stack+0x198/0x1fd [ 781.347335][ T1158] panic+0x382/0x7fb [ 781.351225][ T1158] ? __warn_printk+0xf3/0xf3 [ 781.355812][ T1158] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 781.361436][ T1158] ? preempt_schedule_thunk+0x16/0x18 [ 781.366802][ T1158] ? watchdog.cold+0x5/0x16b [ 781.371382][ T1158] ? watchdog+0xa82/0x1000 [ 781.375794][ T1158] watchdog.cold+0x16/0x16b [ 781.380295][ T1158] ? reset_hung_task_detector+0x30/0x30 [ 781.385831][ T1158] kthread+0x3b5/0x4a0 [ 781.389895][ T1158] ? __kthread_bind_mask+0xc0/0xc0 [ 781.394996][ T1158] ret_from_fork+0x1f/0x30 [ 781.400848][ T1158] Kernel Offset: disabled [ 781.405172][ T1158] Rebooting in 86400 seconds..