Warning: Permanently added '10.128.0.135' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 502.742223][ T6850] IPVS: ftp: loaded support on port[0] = 21 [ 657.151624][ T1177] INFO: task kworker/0:0:6842 blocked for more than 143 seconds. [ 657.159562][ T1177] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.169319][ T1177] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.178804][ T1177] task:kworker/0:0 state:D stack:29288 pid: 6842 ppid: 2 flags:0x00004000 [ 657.189977][ T1177] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.197197][ T1177] Call Trace: [ 657.200538][ T1177] __schedule+0xec9/0x2280 [ 657.206078][ T1177] ? io_schedule_timeout+0x140/0x140 [ 657.211371][ T1177] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.218518][ T1177] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.224430][ T1177] ? lockdep_hardirqs_on+0x53/0x100 [ 657.229634][ T1177] schedule+0xd0/0x2a0 [ 657.234860][ T1177] schedule_preempt_disabled+0xf/0x20 [ 657.240235][ T1177] __mutex_lock+0x3e2/0x10e0 [ 657.246007][ T1177] ? addrconf_verify_work+0xa/0x20 [ 657.251130][ T1177] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.257657][ T1177] ? lock_release+0x8f0/0x8f0 [ 657.263051][ T1177] ? lock_downgrade+0x830/0x830 [ 657.267914][ T1177] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.274247][ T1177] ? lock_is_held_type+0xbb/0xf0 [ 657.279196][ T1177] addrconf_verify_work+0xa/0x20 [ 657.286293][ T1177] process_one_work+0x94c/0x1670 [ 657.291247][ T1177] ? lock_release+0x8f0/0x8f0 [ 657.297031][ T1177] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.303153][ T1177] ? rwlock_bug.part.0+0x90/0x90 [ 657.308096][ T1177] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.315527][ T1177] worker_thread+0x64c/0x1120 [ 657.320225][ T1177] ? __kthread_parkme+0x13f/0x1e0 [ 657.326402][ T1177] ? process_one_work+0x1670/0x1670 [ 657.332372][ T1177] kthread+0x3b5/0x4a0 [ 657.336443][ T1177] ? __kthread_bind_mask+0xc0/0xc0 [ 657.342655][ T1177] ret_from_fork+0x1f/0x30 [ 657.347178][ T1177] [ 657.347178][ T1177] Showing all locks held in the system: [ 657.356111][ T1177] 1 lock held by khungtaskd/1177: [ 657.361143][ T1177] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.373050][ T1177] 1 lock held by in:imklog/6529: [ 657.377985][ T1177] #0: ffff8880a85408b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.388243][ T1177] 3 locks held by kworker/0:0/6842: [ 657.394525][ T1177] #0: ffff88809a257d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.406227][ T1177] #1: ffffc90000ff7da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.417496][ T1177] #2: ffffffff8b150988 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.427733][ T1177] 1 lock held by syz-executor020/6871: [ 657.433983][ T1177] [ 657.436310][ T1177] ============================================= [ 657.436310][ T1177] [ 657.446938][ T1177] NMI backtrace for cpu 1 [ 657.451305][ T1177] CPU: 1 PID: 1177 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.459526][ T1177] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.469570][ T1177] Call Trace: [ 657.473003][ T1177] dump_stack+0x198/0x1fd [ 657.477335][ T1177] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.482532][ T1177] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.488159][ T1177] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.494133][ T1177] watchdog+0xd7d/0x1000 [ 657.498383][ T1177] ? reset_hung_task_detector+0x30/0x30 [ 657.503923][ T1177] kthread+0x3b5/0x4a0 [ 657.507986][ T1177] ? __kthread_bind_mask+0xc0/0xc0 [ 657.513095][ T1177] ret_from_fork+0x1f/0x30 [ 657.517624][ T1177] Sending NMI from CPU 1 to CPUs 0: [ 657.524177][ C0] NMI backtrace for cpu 0 [ 657.524183][ C0] CPU: 0 PID: 6871 Comm: syz-executor020 Not tainted 5.9.0-rc8-syzkaller #0 [ 657.524189][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.524192][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x30/0x60 [ 657.524203][ C0] Code: fe 01 00 65 8b 05 60 bf 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 [ 657.524207][ C0] RSP: 0018:ffffc90005686cd8 EFLAGS: 00000246 [ 657.524214][ C0] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff83d863a9 [ 657.524219][ C0] RDX: ffff888093c441c0 RSI: ffffffff83d8631f RDI: 0000000000000001 [ 657.524224][ C0] RBP: 00000000ffffff55 R08: 0000000000000000 R09: ffff88809f591c07 [ 657.524228][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a9cba702 [ 657.524233][ C0] R13: ffff8880a9cf9250 R14: 0000000000000006 R15: ffff8880a9cf9040 [ 657.524238][ C0] FS: 0000000000f5d880(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 [ 657.524242][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.524247][ C0] CR2: 00000000006cd080 CR3: 00000000a2906000 CR4: 00000000001506f0 [ 657.524252][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.524256][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.524259][ C0] Call Trace: [ 657.524262][ C0] __radix_tree_lookup+0xef/0x290 [ 657.524265][ C0] tcf_idr_check_alloc+0xb0/0x3b0 [ 657.524269][ C0] tcf_police_init+0x347/0x13a0 [ 657.524272][ C0] ? tcf_police_cleanup+0x60/0x60 [ 657.524275][ C0] ? find_held_lock+0x2d/0x110 [ 657.524278][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 657.524281][ C0] tcf_action_init_1+0x1a3/0x990 [ 657.524285][ C0] ? tcf_action_dump_old+0x80/0x80 [ 657.524288][ C0] ? lock_acquire+0x1f3/0xaf0 [ 657.524291][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.524294][ C0] ? find_held_lock+0x2d/0x110 [ 657.524297][ C0] ? fs_reclaim_release+0x90/0xd0 [ 657.524300][ C0] ? mark_lock+0x82/0x1660 [ 657.524304][ C0] tcf_exts_validate+0x138/0x420 [ 657.524307][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 657.524310][ C0] ? kmem_cache_alloc_trace+0x18e/0x300 [ 657.524313][ C0] ? __nla_parse+0x3d/0x4a [ 657.524316][ C0] rsvp_change+0x291/0x27a0 [ 657.524319][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.524323][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.524326][ C0] ? find_held_lock+0x2d/0x110 [ 657.524329][ C0] ? tc_new_tfilter+0x1be4/0x2130 [ 657.524332][ C0] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.524336][ C0] ? lock_downgrade+0x830/0x830 [ 657.524339][ C0] ? blackhole_dequeue+0x10/0x10 [ 657.524342][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.524345][ C0] tc_new_tfilter+0x1398/0x2130 [ 657.524349][ C0] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.524352][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.524356][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.524359][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.524362][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.524366][ C0] ? security_capable+0x8f/0xc0 [ 657.524369][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.524372][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.524375][ C0] rtnetlink_rcv_msg+0x80f/0xad0 [ 657.524379][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 657.524386][ C0] ? lock_acquire+0x1f3/0xaf0 [ 657.524390][ C0] ? netlink_deliver_tap+0x146/0xb70 [ 657.524393][ C0] netlink_rcv_skb+0x15a/0x430 [ 657.524396][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 657.524399][ C0] ? netlink_ack+0xa10/0xa10 [ 657.524403][ C0] ? __kmalloc_node_track_caller+0x38/0x60 [ 657.524406][ C0] netlink_unicast+0x533/0x7d0 [ 657.524410][ C0] ? netlink_attachskb+0x810/0x810 [ 657.524413][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 657.524416][ C0] ? __check_object_size+0x171/0x3e4 [ 657.524419][ C0] netlink_sendmsg+0x856/0xd90 [ 657.524422][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 657.524426][ C0] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 657.524429][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 657.524432][ C0] sock_sendmsg+0xcf/0x120 [ 657.524435][ C0] ____sys_sendmsg+0x331/0x810 [ 657.524438][ C0] ? kernel_sendmsg+0x50/0x50 [ 657.524441][ C0] ? do_recvmmsg+0x6d0/0x6d0 [ 657.524444][ C0] ? sock_alloc_file+0x4f/0x190 [ 657.524448][ C0] ? __lock_acquire+0x164a/0x5780 [ 657.524451][ C0] ___sys_sendmsg+0xf3/0x170 [ 657.524454][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 657.524458][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.524461][ C0] ? fs_reclaim_release+0x90/0xd0 [ 657.524464][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.524467][ C0] ? find_held_lock+0x2d/0x110 [ 657.524470][ C0] ? __might_fault+0x11f/0x1d0 [ 657.524474][ C0] ? lock_downgrade+0x830/0x830 [ 657.524477][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.524480][ C0] __sys_sendmmsg+0x195/0x480 [ 657.524483][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 657.524486][ C0] ? find_held_lock+0x2d/0x110 [ 657.524489][ C0] ? __fd_install+0x1b4/0x600 [ 657.524493][ C0] ? alloc_file_pseudo+0x1/0x250 [ 657.524496][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.524499][ C0] ? __fd_install+0x1e6/0x600 [ 657.524502][ C0] ? __sys_socket+0x16d/0x200 [ 657.524505][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.524509][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.524512][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 657.524516][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.524519][ C0] do_syscall_64+0x2d/0x70 [ 657.524523][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.524525][ C0] RIP: 0033:0x441769 [ 657.524536][ 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 [ 657.524539][ C0] RSP: 002b:00007ffd99b4fe08 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 657.524548][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441769 [ 657.524552][ C0] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 657.524557][ C0] RBP: 00007ffd99b4fe10 R08: 0000000120080522 R09: 0000000120080522 [ 657.524562][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2ab0 [ 657.524566][ C0] R13: 0000000000402640 R14: 0000000000000000 R15: 0000000000000000 [ 657.524572][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 657.541451][ T1177] Kernel panic - not syncing: hung_task: blocked tasks [ 658.147353][ T1177] CPU: 1 PID: 1177 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 658.155575][ T1177] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.165619][ T1177] Call Trace: [ 658.168909][ T1177] dump_stack+0x198/0x1fd [ 658.173236][ T1177] panic+0x382/0x7fb [ 658.177136][ T1177] ? __warn_printk+0xf3/0xf3 [ 658.181722][ T1177] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.187348][ T1177] ? preempt_schedule_thunk+0x16/0x18 [ 658.192722][ T1177] ? watchdog.cold+0x5/0x16b [ 658.197304][ T1177] ? watchdog+0xa82/0x1000 [ 658.201716][ T1177] watchdog.cold+0x16/0x16b [ 658.206219][ T1177] ? reset_hung_task_detector+0x30/0x30 [ 658.211759][ T1177] kthread+0x3b5/0x4a0 [ 658.215820][ T1177] ? __kthread_bind_mask+0xc0/0xc0 [ 658.220925][ T1177] ret_from_fork+0x1f/0x30 [ 658.226866][ T1177] Kernel Offset: disabled [ 658.231228][ T1177] Rebooting in 86400 seconds..