Warning: Permanently added '10.128.0.129' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 613.956921][ T6868] IPVS: ftp: loaded support on port[0] = 21 [ 780.076300][ T1165] INFO: task kworker/0:2:2638 blocked for more than 143 seconds. [ 780.084222][ T1165] Not tainted 5.9.0-rc8-syzkaller #0 [ 780.092001][ T1165] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 780.101398][ T1165] task:kworker/0:2 state:D stack:26824 pid: 2638 ppid: 2 flags:0x00004000 [ 780.111475][ T1165] Workqueue: ipv6_addrconf addrconf_verify_work [ 780.118474][ T1165] Call Trace: [ 780.121834][ T1165] __schedule+0xec9/0x2280 [ 780.127354][ T1165] ? io_schedule_timeout+0x140/0x140 [ 780.132777][ T1165] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 780.141170][ T1165] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.147074][ T1165] ? lockdep_hardirqs_on+0x53/0x100 [ 780.152289][ T1165] schedule+0xd0/0x2a0 [ 780.157561][ T1165] schedule_preempt_disabled+0xf/0x20 [ 780.162943][ T1165] __mutex_lock+0x3e2/0x10e0 [ 780.168616][ T1165] ? addrconf_verify_work+0xa/0x20 [ 780.173745][ T1165] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.181158][ T1165] ? lock_release+0x8f0/0x8f0 [ 780.185846][ T1165] ? lock_downgrade+0x830/0x830 [ 780.191727][ T1165] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.197597][ T1165] ? lock_is_held_type+0xbb/0xf0 [ 780.202550][ T1165] addrconf_verify_work+0xa/0x20 [ 780.208710][ T1165] process_one_work+0x94c/0x1670 [ 780.213667][ T1165] ? lock_release+0x8f0/0x8f0 [ 780.219441][ T1165] ? pwq_dec_nr_in_flight+0x320/0x320 [ 780.224829][ T1165] ? rwlock_bug.part.0+0x90/0x90 [ 780.230866][ T1165] ? lockdep_hardirqs_off+0x96/0xd0 [ 780.236083][ T1165] worker_thread+0x64c/0x1120 [ 780.241856][ T1165] ? __kthread_parkme+0x13f/0x1e0 [ 780.247571][ T1165] ? process_one_work+0x1670/0x1670 [ 780.252778][ T1165] kthread+0x3b5/0x4a0 [ 780.257965][ T1165] ? __kthread_bind_mask+0xc0/0xc0 [ 780.263180][ T1165] ret_from_fork+0x1f/0x30 [ 780.269931][ T1165] [ 780.269931][ T1165] Showing all locks held in the system: [ 780.278380][ T1165] 1 lock held by khungtaskd/1165: [ 780.283402][ T1165] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 780.295297][ T1165] 3 locks held by kworker/0:2/2638: [ 780.301166][ T1165] #0: ffff888214c29938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 780.312781][ T1165] #1: ffffc90009117da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 780.324295][ T1165] #2: ffffffff8b150988 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 780.334391][ T1165] 1 lock held by in:imklog/6564: [ 780.339958][ T1165] #0: ffff8880a223ab70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 780.350022][ T1165] 2 locks held by syz-executor746/6890: [ 780.355590][ T1165] [ 780.359127][ T1165] ============================================= [ 780.359127][ T1165] [ 780.368254][ T1165] NMI backtrace for cpu 1 [ 780.372594][ T1165] CPU: 1 PID: 1165 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 780.380816][ T1165] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.391042][ T1165] Call Trace: [ 780.394463][ T1165] dump_stack+0x198/0x1fd [ 780.398801][ T1165] nmi_cpu_backtrace.cold+0x70/0xb1 [ 780.404049][ T1165] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 780.409686][ T1165] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 780.415711][ T1165] watchdog+0xd7d/0x1000 [ 780.419959][ T1165] ? reset_hung_task_detector+0x30/0x30 [ 780.425537][ T1165] kthread+0x3b5/0x4a0 [ 780.429602][ T1165] ? __kthread_bind_mask+0xc0/0xc0 [ 780.434712][ T1165] ret_from_fork+0x1f/0x30 [ 780.439367][ T1165] Sending NMI from CPU 1 to CPUs 0: [ 780.446259][ C0] NMI backtrace for cpu 0 [ 780.446266][ C0] CPU: 0 PID: 6890 Comm: syz-executor746 Not tainted 5.9.0-rc8-syzkaller #0 [ 780.446273][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.446277][ C0] RIP: 0010:debug_lockdep_rcu_enabled+0x2b/0x30 [ 780.446289][ C0] Code: 05 3a e7 32 03 85 c0 74 21 8b 05 ac 18 33 03 85 c0 74 17 65 48 8b 04 25 c0 fe 01 00 8b 80 e4 08 00 00 85 c0 0f 94 c0 0f b6 c0 cc cc cc cc 55 53 48 c7 c3 00 6c 03 00 e8 72 0b 00 00 83 f8 3f [ 780.446294][ C0] RSP: 0018:ffffc900055a6bc8 EFLAGS: 00000246 [ 780.446302][ C0] RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff815c00df [ 780.446308][ C0] RDX: fffffbfff16b32ea RSI: 0000000000000008 RDI: ffffffff8b599748 [ 780.446313][ C0] RBP: 1ffff92000ab4d7c R08: 0000000000000000 R09: ffffffff8b59974f [ 780.446319][ C0] R10: fffffbfff16b32e9 R11: 0000000000000000 R12: ffffc900055a6f88 [ 780.446324][ C0] R13: ffff88809e5a7e68 R14: ffffffff868ae80e R15: ffff88809e5a7e00 [ 780.446330][ C0] FS: 0000000000934880(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 [ 780.446335][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 780.446341][ C0] CR2: 0000000020000280 CR3: 00000000a78c7000 CR4: 00000000001506f0 [ 780.446346][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 780.446352][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 780.446355][ C0] Call Trace: [ 780.446358][ C0] lock_release+0x615/0x8f0 [ 780.446362][ C0] ? __mutex_lock+0x626/0x10e0 [ 780.446366][ C0] ? lock_downgrade+0x830/0x830 [ 780.446370][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 780.446374][ C0] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.446378][ C0] __mutex_unlock_slowpath+0x81/0x610 [ 780.446383][ C0] ? wait_for_completion+0x260/0x260 [ 780.446387][ C0] tcf_idr_check_alloc+0x29e/0x3b0 [ 780.446390][ C0] tcf_police_init+0x347/0x13a0 [ 780.446394][ C0] ? tcf_police_cleanup+0x60/0x60 [ 780.446398][ C0] ? find_held_lock+0x2d/0x110 [ 780.446402][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 780.446406][ C0] tcf_action_init_1+0x1a3/0x990 [ 780.446410][ C0] ? tcf_action_dump_old+0x80/0x80 [ 780.446414][ C0] ? lock_acquire+0x1f3/0xaf0 [ 780.446418][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.446422][ C0] ? find_held_lock+0x2d/0x110 [ 780.446425][ C0] ? fs_reclaim_release+0x90/0xd0 [ 780.446429][ C0] ? mark_lock+0x82/0x1660 [ 780.446433][ C0] tcf_exts_validate+0x138/0x420 [ 780.446437][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 780.446441][ C0] ? kmem_cache_alloc_trace+0x18e/0x300 [ 780.446445][ C0] ? __nla_parse+0x3d/0x4a [ 780.446449][ C0] rsvp_change+0x291/0x27a0 [ 780.446452][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.446456][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.446460][ C0] ? find_held_lock+0x2d/0x110 [ 780.446464][ C0] ? tc_new_tfilter+0x1be4/0x2130 [ 780.446468][ C0] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 780.446472][ C0] ? lock_downgrade+0x830/0x830 [ 780.446476][ C0] ? blackhole_dequeue+0x10/0x10 [ 780.446480][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.446484][ C0] tc_new_tfilter+0x1398/0x2130 [ 780.446488][ C0] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 780.446492][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.446496][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.446501][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.446505][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.446516][ C0] ? security_capable+0x8f/0xc0 [ 780.446520][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.446524][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.446528][ C0] rtnetlink_rcv_msg+0x80f/0xad0 [ 780.446532][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 780.446536][ C0] ? lock_acquire+0x1f3/0xaf0 [ 780.446540][ C0] ? netlink_deliver_tap+0x146/0xb70 [ 780.446544][ C0] netlink_rcv_skb+0x15a/0x430 [ 780.446548][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 780.446552][ C0] ? netlink_ack+0xa10/0xa10 [ 780.446556][ C0] ? __kmalloc_node_track_caller+0x38/0x60 [ 780.446560][ C0] netlink_unicast+0x533/0x7d0 [ 780.446564][ C0] ? netlink_attachskb+0x810/0x810 [ 780.446568][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 780.446572][ C0] ? __check_object_size+0x171/0x3e4 [ 780.446576][ C0] netlink_sendmsg+0x856/0xd90 [ 780.446580][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 780.446584][ C0] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 780.446589][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 780.446592][ C0] sock_sendmsg+0xcf/0x120 [ 780.446596][ C0] ____sys_sendmsg+0x331/0x810 [ 780.446600][ C0] ? kernel_sendmsg+0x50/0x50 [ 780.446604][ C0] ? do_recvmmsg+0x6d0/0x6d0 [ 780.446608][ C0] ? sock_alloc_file+0x4f/0x190 [ 780.446612][ C0] ? __lock_acquire+0x164a/0x5780 [ 780.446616][ C0] ___sys_sendmsg+0xf3/0x170 [ 780.446621][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 780.446625][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.446630][ C0] ? fs_reclaim_release+0x90/0xd0 [ 780.446634][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.446638][ C0] ? find_held_lock+0x2d/0x110 [ 780.446642][ C0] ? __might_fault+0x11f/0x1d0 [ 780.446646][ C0] ? lock_downgrade+0x830/0x830 [ 780.446650][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.446654][ C0] __sys_sendmmsg+0x195/0x480 [ 780.446658][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 780.446662][ C0] ? find_held_lock+0x2d/0x110 [ 780.446666][ C0] ? __fd_install+0x1b4/0x600 [ 780.446670][ C0] ? alloc_file_pseudo+0x1/0x250 [ 780.446674][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.446678][ C0] ? __fd_install+0x1e6/0x600 [ 780.446682][ C0] ? __sys_socket+0x16d/0x200 [ 780.446686][ C0] ? lock_is_held_type+0xbb/0xf0 [ 780.446691][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 780.446695][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 780.446699][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 780.446703][ C0] do_syscall_64+0x2d/0x70 [ 780.446708][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.446711][ C0] RIP: 0033:0x441759 [ 780.446723][ 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 [ 780.446728][ C0] RSP: 002b:00007fffd9bc9248 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 780.446738][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441759 [ 780.446744][ C0] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 780.446750][ C0] RBP: 00007fffd9bc9250 R08: 0000000120080522 R09: 0000000120080522 [ 780.446755][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2a90 [ 780.446761][ C0] R13: 0000000000402630 R14: 0000000000000000 R15: 0000000000000000 [ 780.446768][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 780.466169][ T1165] Kernel panic - not syncing: hung_task: blocked tasks [ 781.103331][ T1165] CPU: 1 PID: 1165 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 781.111650][ T1165] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 781.121717][ T1165] Call Trace: [ 781.125198][ T1165] dump_stack+0x198/0x1fd [ 781.129637][ T1165] panic+0x382/0x7fb [ 781.133545][ T1165] ? __warn_printk+0xf3/0xf3 [ 781.138269][ T1165] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 781.143920][ T1165] ? preempt_schedule_thunk+0x16/0x18 [ 781.149577][ T1165] ? watchdog.cold+0x5/0x16b [ 781.154176][ T1165] ? watchdog+0xa82/0x1000 [ 781.158605][ T1165] watchdog.cold+0x16/0x16b [ 781.163121][ T1165] ? reset_hung_task_detector+0x30/0x30 [ 781.168682][ T1165] kthread+0x3b5/0x4a0 [ 781.173055][ T1165] ? __kthread_bind_mask+0xc0/0xc0 [ 781.178182][ T1165] ret_from_fork+0x1f/0x30 [ 781.184357][ T1165] Kernel Offset: disabled [ 781.188844][ T1165] Rebooting in 86400 seconds..