Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 496.751521][ T6862] IPVS: ftp: loaded support on port[0] = 21 [ 657.358301][ T1175] INFO: task kworker/0:0:6854 blocked for more than 143 seconds. [ 657.367034][ T1175] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.377590][ T1175] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.387493][ T1175] task:kworker/0:0 state:D stack:29856 pid: 6854 ppid: 2 flags:0x00004000 [ 657.398950][ T1175] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.405217][ T1175] Call Trace: [ 657.409625][ T1175] __schedule+0xec9/0x2280 [ 657.414085][ T1175] ? io_schedule_timeout+0x140/0x140 [ 657.420683][ T1175] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.426836][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.433397][ T1175] ? lockdep_hardirqs_on+0x53/0x100 [ 657.439307][ T1175] schedule+0xd0/0x2a0 [ 657.443395][ T1175] schedule_preempt_disabled+0xf/0x20 [ 657.449868][ T1175] __mutex_lock+0x3e2/0x10e0 [ 657.454479][ T1175] ? addrconf_verify_work+0xa/0x20 [ 657.460718][ T1175] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.466123][ T1175] ? lock_release+0x8f0/0x8f0 [ 657.471969][ T1175] ? lock_downgrade+0x830/0x830 [ 657.476873][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.483372][ T1175] ? lock_is_held_type+0xbb/0xf0 [ 657.488972][ T1175] addrconf_verify_work+0xa/0x20 [ 657.493928][ T1175] process_one_work+0x94c/0x1670 [ 657.501192][ T1175] ? lock_release+0x8f0/0x8f0 [ 657.505895][ T1175] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.512339][ T1175] ? rwlock_bug.part.0+0x90/0x90 [ 657.517294][ T1175] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.523581][ T1175] worker_thread+0x64c/0x1120 [ 657.528882][ T1175] ? __kthread_parkme+0x13f/0x1e0 [ 657.533918][ T1175] ? process_one_work+0x1670/0x1670 [ 657.541051][ T1175] kthread+0x3b5/0x4a0 [ 657.545131][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 657.551225][ T1175] ret_from_fork+0x1f/0x30 [ 657.555770][ T1175] [ 657.555770][ T1175] Showing all locks held in the system: [ 657.564718][ T1175] 1 lock held by khungtaskd/1175: [ 657.571285][ T1175] #0: ffffffff8a068480 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.581833][ T1175] 1 lock held by in:imklog/6559: [ 657.586785][ T1175] #0: ffff8880a45ce630 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.597069][ T1175] 3 locks held by kworker/0:0/6854: [ 657.603071][ T1175] #0: ffff88809952f938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.614726][ T1175] #1: ffffc90001377da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.625858][ T1175] #2: ffffffff8b17a448 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.637083][ T1175] 2 locks held by syz-executor902/6884: [ 657.643292][ T1175] [ 657.645624][ T1175] ============================================= [ 657.645624][ T1175] [ 657.655086][ T1175] NMI backtrace for cpu 0 [ 657.659518][ T1175] CPU: 0 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.667754][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.677799][ T1175] Call Trace: [ 657.681210][ T1175] dump_stack+0x198/0x1fd [ 657.685605][ T1175] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.690800][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.696435][ T1175] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.702423][ T1175] watchdog+0xd7d/0x1000 [ 657.706675][ T1175] ? reset_hung_task_detector+0x30/0x30 [ 657.712219][ T1175] kthread+0x3b5/0x4a0 [ 657.716282][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 657.721391][ T1175] ret_from_fork+0x1f/0x30 [ 657.725962][ T1175] Sending NMI from CPU 0 to CPUs 1: [ 657.732534][ C1] NMI backtrace for cpu 1 [ 657.732540][ C1] CPU: 1 PID: 6884 Comm: syz-executor902 Not tainted 5.9.0-rc8-syzkaller #0 [ 657.732546][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.732550][ C1] RIP: 0010:mark_lock+0x0/0x1660 [ 657.732562][ C1] Code: 66 2e 0f 1f 84 00 00 00 00 00 be 00 00 01 00 48 c7 c7 c0 96 a9 8c e8 6f f7 62 02 48 98 c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 <41> 57 41 56 41 55 41 54 55 53 48 83 ec 20 83 fa 09 48 89 3c 24 0f [ 657.732572][ C1] RSP: 0018:ffffc900054c6998 EFLAGS: 00000046 [ 657.732580][ C1] RAX: 0000000000000004 RBX: ffff88809312caac RCX: ffffffff815bc194 [ 657.732585][ C1] RDX: 0000000000000002 RSI: ffff88809312caf0 RDI: ffff88809312c1c0 [ 657.732590][ C1] RBP: ffff88809312c1c0 R08: 0000000000000000 R09: ffffffff8d10f9ff [ 657.732595][ C1] R10: fffffbfff1a21f3f R11: 0000000000000000 R12: ffff88809312caf0 [ 657.732601][ C1] R13: ffff88809312cb12 R14: 0000000000000000 R15: ffff88809312cac8 [ 657.732607][ C1] FS: 0000000000d54880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 657.732611][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.732616][ C1] CR2: 00007f83d843c6c0 CR3: 00000000a735f000 CR4: 00000000001506e0 [ 657.732622][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.732627][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.732629][ C1] Call Trace: [ 657.732633][ C1] __lock_acquire+0x856/0x5780 [ 657.732637][ C1] ? lockdep_hardirqs_on+0x53/0x100 [ 657.732641][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.732644][ C1] lock_acquire+0x1f3/0xaf0 [ 657.732648][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.732651][ C1] ? lock_release+0x8f0/0x8f0 [ 657.732654][ C1] ? kvm_sched_clock_read+0x14/0x40 [ 657.732658][ C1] ? preempt_schedule_thunk+0x16/0x18 [ 657.732662][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.732665][ C1] __mutex_lock+0x134/0x10e0 [ 657.732669][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.732672][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.732676][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.732680][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 657.732684][ C1] ? wait_for_completion+0x260/0x260 [ 657.732687][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 657.732691][ C1] tcf_police_init+0x347/0x13a0 [ 657.732694][ C1] ? tcf_police_cleanup+0x60/0x60 [ 657.732697][ C1] ? find_held_lock+0x2d/0x110 [ 657.732701][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 657.732705][ C1] tcf_action_init_1+0x1a3/0x990 [ 657.732708][ C1] ? tcf_action_dump_old+0x80/0x80 [ 657.732712][ C1] ? lock_acquire+0x1f3/0xaf0 [ 657.732715][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.732718][ C1] ? find_held_lock+0x2d/0x110 [ 657.732722][ C1] ? fs_reclaim_release+0x90/0xd0 [ 657.732725][ C1] ? mark_lock+0x82/0x1660 [ 657.732729][ C1] tcf_exts_validate+0x138/0x420 [ 657.732732][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 657.732736][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 657.732739][ C1] ? __nla_parse+0x3d/0x4a [ 657.732742][ C1] rsvp_change+0x291/0x27a0 [ 657.732746][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.732749][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.732753][ C1] ? find_held_lock+0x2d/0x110 [ 657.732756][ C1] ? tc_new_tfilter+0x1be4/0x2130 [ 657.732760][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.732763][ C1] ? lock_downgrade+0x830/0x830 [ 657.732767][ C1] ? blackhole_dequeue+0x10/0x10 [ 657.732770][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.732774][ C1] tc_new_tfilter+0x1398/0x2130 [ 657.732778][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.732781][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.732785][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.732789][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.732793][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.732796][ C1] ? security_capable+0x8f/0xc0 [ 657.732800][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.732803][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.732807][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 657.732810][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.732814][ C1] ? lock_acquire+0x1f3/0xaf0 [ 657.732818][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 657.732821][ C1] netlink_rcv_skb+0x15a/0x430 [ 657.732825][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.732828][ C1] ? netlink_ack+0xa10/0xa10 [ 657.732832][ C1] ? __kmalloc_node_track_caller+0x38/0x60 [ 657.732835][ C1] netlink_unicast+0x533/0x7d0 [ 657.732839][ C1] ? netlink_attachskb+0x810/0x810 [ 657.732842][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 657.732846][ C1] ? __check_object_size+0x171/0x3e4 [ 657.732850][ C1] netlink_sendmsg+0x856/0xd90 [ 657.732853][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.732857][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 657.732860][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.732863][ C1] sock_sendmsg+0xcf/0x120 [ 657.732867][ C1] ____sys_sendmsg+0x331/0x810 [ 657.732870][ C1] ? kernel_sendmsg+0x50/0x50 [ 657.732873][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 657.732877][ C1] ? sock_alloc_file+0x4f/0x190 [ 657.732880][ C1] ? __lock_acquire+0x164a/0x5780 [ 657.732884][ C1] ___sys_sendmsg+0xf3/0x170 [ 657.732887][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 657.732892][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.732895][ C1] ? fs_reclaim_release+0x90/0xd0 [ 657.732899][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.732902][ C1] ? find_held_lock+0x2d/0x110 [ 657.732905][ C1] ? __might_fault+0x11f/0x1d0 [ 657.732909][ C1] ? lock_downgrade+0x830/0x830 [ 657.732912][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.732916][ C1] __sys_sendmmsg+0x195/0x480 [ 657.732919][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 657.732923][ C1] ? find_held_lock+0x2d/0x110 [ 657.732926][ C1] ? __fd_install+0x1b4/0x600 [ 657.732930][ C1] ? alloc_file_pseudo+0x1/0x250 [ 657.732933][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.732936][ C1] ? __fd_install+0x1e6/0x600 [ 657.732940][ C1] ? __sys_socket+0x16d/0x200 [ 657.732943][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.732947][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.732951][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 657.732955][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.732958][ C1] do_syscall_64+0x2d/0x70 [ 657.732962][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.732965][ C1] RIP: 0033:0x441759 [ 657.732977][ 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 [ 657.732981][ C1] RSP: 002b:00007ffcf90aa518 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 657.732990][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441759 [ 657.732995][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 657.733000][ C1] RBP: 00007ffcf90aa520 R08: 0000000120080522 R09: 0000000120080522 [ 657.733005][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2a90 [ 657.733011][ C1] R13: 0000000000402630 R14: 0000000000000000 R15: 0000000000000000 [ 657.733017][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 657.779800][ T1175] Kernel panic - not syncing: hung_task: blocked tasks [ 658.430619][ T1175] CPU: 0 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 658.438931][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.449419][ T1175] Call Trace: [ 658.452708][ T1175] dump_stack+0x198/0x1fd [ 658.457033][ T1175] panic+0x382/0x7fb [ 658.460922][ T1175] ? __warn_printk+0xf3/0xf3 [ 658.465509][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.471482][ T1175] ? preempt_schedule_thunk+0x16/0x18 [ 658.476845][ T1175] ? watchdog.cold+0x5/0x16b [ 658.481424][ T1175] ? watchdog+0xa82/0x1000 [ 658.485833][ T1175] watchdog.cold+0x16/0x16b [ 658.490339][ T1175] ? reset_hung_task_detector+0x30/0x30 [ 658.495974][ T1175] kthread+0x3b5/0x4a0 [ 658.500034][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 658.505139][ T1175] ret_from_fork+0x1f/0x30 [ 658.511149][ T1175] Kernel Offset: disabled [ 658.515521][ T1175] Rebooting in 86400 seconds..