Warning: Permanently added '10.128.0.217' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 490.751428][ T6888] IPVS: ftp: loaded support on port[0] = 21 executing program [ 490.793362][ T6910] netlink: 388 bytes leftover after parsing attributes in process `syz-executor787'. [ 490.810899][ T6911] netlink: 388 bytes leftover after parsing attributes in process `syz-executor787'. [ 657.228882][ T1175] INFO: task kworker/0:2:6880 blocked for more than 143 seconds. [ 657.236792][ T1175] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.248104][ T1175] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.257712][ T1175] task:kworker/0:2 state:D stack:30072 pid: 6880 ppid: 2 flags:0x00004000 [ 657.267862][ T1175] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.274964][ T1175] Call Trace: [ 657.278312][ T1175] __schedule+0xec9/0x2280 [ 657.283986][ T1175] ? io_schedule_timeout+0x140/0x140 [ 657.290208][ T1175] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.296200][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.302670][ T1175] ? lockdep_hardirqs_on+0x53/0x100 [ 657.307883][ T1175] schedule+0xd0/0x2a0 [ 657.313247][ T1175] schedule_preempt_disabled+0xf/0x20 [ 657.318646][ T1175] __mutex_lock+0x3e2/0x10e0 [ 657.324446][ T1175] ? addrconf_verify_work+0xa/0x20 [ 657.330438][ T1175] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.335831][ T1175] ? lock_release+0x8f0/0x8f0 [ 657.341709][ T1175] ? lock_downgrade+0x830/0x830 [ 657.346574][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.353969][ T1175] ? lock_is_held_type+0xbb/0xf0 [ 657.359714][ T1175] addrconf_verify_work+0xa/0x20 [ 657.364667][ T1175] process_one_work+0x94c/0x1670 [ 657.372242][ T1175] ? lock_release+0x8f0/0x8f0 [ 657.376934][ T1175] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.383534][ T1175] ? rwlock_bug.part.0+0x90/0x90 [ 657.388492][ T1175] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.395753][ T1175] worker_thread+0x64c/0x1120 [ 657.401228][ T1175] ? __kthread_parkme+0x13f/0x1e0 [ 657.406278][ T1175] ? process_one_work+0x1670/0x1670 [ 657.413852][ T1175] kthread+0x3b5/0x4a0 [ 657.419817][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 657.424956][ T1175] ret_from_fork+0x1f/0x30 [ 657.430776][ T1175] [ 657.430776][ T1175] Showing all locks held in the system: [ 657.438508][ T1175] 1 lock held by khungtaskd/1175: [ 657.444955][ T1175] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.457493][ T1175] 1 lock held by in:imklog/6774: [ 657.463250][ T1175] #0: ffff888092990670 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.473500][ T1175] 3 locks held by kworker/0:2/6880: [ 657.479506][ T1175] #0: ffff888214eee138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.491308][ T1175] #1: ffffc90005f57da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.503715][ T1175] #2: ffffffff8b14f0c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.514107][ T1175] 1 lock held by syz-executor787/6911: [ 657.521754][ T1175] [ 657.524085][ T1175] ============================================= [ 657.524085][ T1175] [ 657.533843][ T1175] NMI backtrace for cpu 1 [ 657.538182][ T1175] CPU: 1 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.546409][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.556453][ T1175] Call Trace: [ 657.559858][ T1175] dump_stack+0x198/0x1fd [ 657.564199][ T1175] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.569399][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.575031][ T1175] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.581010][ T1175] watchdog+0xd7d/0x1000 [ 657.585256][ T1175] ? reset_hung_task_detector+0x30/0x30 [ 657.590805][ T1175] kthread+0x3b5/0x4a0 [ 657.594885][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 657.600002][ T1175] ret_from_fork+0x1f/0x30 [ 657.604564][ T1175] Sending NMI from CPU 1 to CPUs 0: [ 657.611244][ C0] NMI backtrace for cpu 0 [ 657.611251][ C0] CPU: 0 PID: 6911 Comm: syz-executor787 Not tainted 5.9.0-rc8-syzkaller #0 [ 657.611258][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.611262][ C0] RIP: 0010:lock_release+0x110/0x8f0 [ 657.611274][ C0] Code: 00 44 8b 8b e4 08 00 00 45 85 c9 0f 85 ac 03 00 00 48 c7 c0 e0 6b fc 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 <0f> 85 13 07 00 00 48 83 3d 02 6b a0 08 00 0f 84 15 05 00 00 9c 58 [ 657.611279][ C0] RSP: 0018:ffffc9000520ec80 EFLAGS: 00000246 [ 657.611288][ C0] RAX: 1ffffffff13f8d7c RBX: ffff8880933902c0 RCX: ffffffff815c005f [ 657.611293][ C0] RDX: dffffc0000000000 RSI: ffffffff8a067e80 RDI: ffff888093390ba4 [ 657.611299][ C0] RBP: 1ffff92000a41d92 R08: 0000000000000000 R09: 0000000000000000 [ 657.611304][ C0] R10: fffffbfff16b3019 R11: 0000000000000000 R12: ffffc9000520f038 [ 657.611310][ C0] R13: ffff88809eafca68 R14: ffffffff868add7e R15: ffff88809eafca00 [ 657.611316][ C0] FS: 000000000269c880(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 [ 657.611321][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.611327][ C0] CR2: 00000000006cd080 CR3: 00000000936f9000 CR4: 00000000001506f0 [ 657.611332][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.611338][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.611341][ C0] Call Trace: [ 657.611345][ C0] ? __mutex_lock+0x626/0x10e0 [ 657.611349][ C0] ? lock_downgrade+0x830/0x830 [ 657.611353][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.611358][ C0] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.611362][ C0] __mutex_unlock_slowpath+0x81/0x610 [ 657.611366][ C0] ? wait_for_completion+0x260/0x260 [ 657.611370][ C0] tcf_idr_check_alloc+0x29e/0x3b0 [ 657.611374][ C0] tcf_police_init+0x347/0x13a0 [ 657.611379][ C0] ? tcf_police_cleanup+0x60/0x60 [ 657.611383][ C0] ? find_held_lock+0x2d/0x110 [ 657.611387][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 657.611391][ C0] tcf_action_init_1+0x1a3/0x990 [ 657.611395][ C0] ? tcf_action_dump_old+0x80/0x80 [ 657.611399][ C0] ? lock_acquire+0x1f3/0xaf0 [ 657.611403][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.611407][ C0] ? find_held_lock+0x2d/0x110 [ 657.611411][ C0] ? fs_reclaim_release+0x90/0xd0 [ 657.611415][ C0] ? mark_lock+0x82/0x1660 [ 657.611419][ C0] tcf_exts_validate+0x138/0x420 [ 657.611423][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 657.611427][ C0] ? kmem_cache_alloc_trace+0x18e/0x300 [ 657.611431][ C0] ? __nla_parse+0x3d/0x4a [ 657.611435][ C0] route4_change+0x6d8/0x2380 [ 657.611439][ C0] ? route4_delete+0xb70/0xb70 [ 657.611443][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.611447][ C0] tc_new_tfilter+0x1398/0x2130 [ 657.611451][ C0] ? route4_delete+0xb70/0xb70 [ 657.611455][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.611460][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.611464][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.611468][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.611472][ C0] ? security_capable+0x8f/0xc0 [ 657.611476][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.611480][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.611484][ C0] rtnetlink_rcv_msg+0x80f/0xad0 [ 657.611489][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 657.611492][ C0] ? lock_acquire+0x1f3/0xaf0 [ 657.611497][ C0] ? netlink_deliver_tap+0x146/0xb70 [ 657.611501][ C0] netlink_rcv_skb+0x15a/0x430 [ 657.611505][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 657.611509][ C0] ? netlink_ack+0xa10/0xa10 [ 657.611513][ C0] ? __kmalloc_node_track_caller+0x38/0x60 [ 657.611517][ C0] netlink_unicast+0x533/0x7d0 [ 657.611522][ C0] ? netlink_attachskb+0x810/0x810 [ 657.611526][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 657.611530][ C0] ? __check_object_size+0x171/0x3e4 [ 657.611534][ C0] netlink_sendmsg+0x856/0xd90 [ 657.611538][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 657.611542][ C0] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 657.611546][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 657.611550][ C0] sock_sendmsg+0xcf/0x120 [ 657.611554][ C0] ____sys_sendmsg+0x331/0x810 [ 657.611558][ C0] ? kernel_sendmsg+0x50/0x50 [ 657.611562][ C0] ? do_recvmmsg+0x6d0/0x6d0 [ 657.611566][ C0] ? sock_alloc_file+0x4f/0x190 [ 657.611570][ C0] ? __lock_acquire+0x164a/0x5780 [ 657.611574][ C0] ___sys_sendmsg+0xf3/0x170 [ 657.611578][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 657.611583][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.611587][ C0] ? fs_reclaim_release+0x90/0xd0 [ 657.611591][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.611595][ C0] ? find_held_lock+0x2d/0x110 [ 657.611599][ C0] ? __might_fault+0x11f/0x1d0 [ 657.611603][ C0] ? lock_downgrade+0x830/0x830 [ 657.611607][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.611611][ C0] __sys_sendmmsg+0x195/0x480 [ 657.611615][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 657.611619][ C0] ? find_held_lock+0x2d/0x110 [ 657.611623][ C0] ? __fd_install+0x1b4/0x600 [ 657.611627][ C0] ? alloc_file_pseudo+0x1/0x250 [ 657.611631][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.611635][ C0] ? __fd_install+0x1e6/0x600 [ 657.611639][ C0] ? __sys_socket+0x16d/0x200 [ 657.611643][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.611648][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.611652][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 657.611657][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.611660][ C0] do_syscall_64+0x2d/0x70 [ 657.611665][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.611668][ C0] RIP: 0033:0x441599 [ 657.611680][ 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 [ 657.611684][ C0] RSP: 002b:00007ffc4c480be8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 657.611694][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441599 [ 657.611700][ C0] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 657.611706][ C0] RBP: 00007ffc4c480bf0 R08: 0000000100000000 R09: 0000000100000000 [ 657.611711][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000077d27 [ 657.611717][ C0] R13: 0000000000402470 R14: 0000000000000000 R15: 0000000000000000 [ 657.611723][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 657.628691][ T1175] Kernel panic - not syncing: hung_task: blocked tasks [ 658.230101][ T1175] CPU: 1 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 658.238325][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.248367][ T1175] Call Trace: [ 658.251664][ T1175] dump_stack+0x198/0x1fd [ 658.255996][ T1175] panic+0x382/0x7fb [ 658.259899][ T1175] ? __warn_printk+0xf3/0xf3 [ 658.264491][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.270123][ T1175] ? preempt_schedule_thunk+0x16/0x18 [ 658.275496][ T1175] ? watchdog.cold+0x5/0x16b [ 658.280078][ T1175] ? watchdog+0xa82/0x1000 [ 658.284493][ T1175] watchdog.cold+0x16/0x16b [ 658.289017][ T1175] ? reset_hung_task_detector+0x30/0x30 [ 658.294561][ T1175] kthread+0x3b5/0x4a0 [ 658.298642][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 658.303937][ T1175] ret_from_fork+0x1f/0x30 [ 658.309817][ T1175] Kernel Offset: disabled [ 658.314174][ T1175] Rebooting in 86400 seconds..