Warning: Permanently added '10.128.10.30' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 514.291827][ T6901] IPVS: ftp: loaded support on port[0] = 21 executing program [ 514.334376][ T6923] netlink: 380 bytes leftover after parsing attributes in process `syz-executor435'. [ 514.351821][ T6924] netlink: 380 bytes leftover after parsing attributes in process `syz-executor435'. [ 780.109633][ T1180] INFO: task kworker/0:4:3936 blocked for more than 143 seconds. [ 780.118717][ T1180] Not tainted 5.9.0-rc8-syzkaller #0 [ 780.127654][ T1180] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 780.137251][ T1180] task:kworker/0:4 state:D stack:28664 pid: 3936 ppid: 2 flags:0x00004000 [ 780.147729][ T1180] Workqueue: ipv6_addrconf addrconf_verify_work [ 780.155070][ T1180] Call Trace: [ 780.158493][ T1180] __schedule+0xec9/0x2280 [ 780.164216][ T1180] ? io_schedule_timeout+0x140/0x140 [ 780.170498][ T1180] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 780.176622][ T1180] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.183271][ T1180] ? lockdep_hardirqs_on+0x53/0x100 [ 780.188490][ T1180] schedule+0xd0/0x2a0 [ 780.193922][ T1180] schedule_preempt_disabled+0xf/0x20 [ 780.199301][ T1180] __mutex_lock+0x3e2/0x10e0 [ 780.205112][ T1180] ? addrconf_verify_work+0xa/0x20 [ 780.211097][ T1180] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.216483][ T1180] ? lock_release+0x8f0/0x8f0 [ 780.222435][ T1180] ? lock_downgrade+0x830/0x830 [ 780.227309][ T1180] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.233765][ T1180] ? lock_is_held_type+0xbb/0xf0 [ 780.238722][ T1180] addrconf_verify_work+0xa/0x20 [ 780.244991][ T1180] process_one_work+0x94c/0x1670 [ 780.251998][ T1180] ? lock_release+0x8f0/0x8f0 [ 780.256696][ T1180] ? pwq_dec_nr_in_flight+0x320/0x320 [ 780.263439][ T1180] ? rwlock_bug.part.0+0x90/0x90 [ 780.268481][ T1180] ? lockdep_hardirqs_off+0x96/0xd0 [ 780.275062][ T1180] worker_thread+0x64c/0x1120 [ 780.280627][ T1180] ? __kthread_parkme+0x13f/0x1e0 [ 780.285663][ T1180] ? process_one_work+0x1670/0x1670 [ 780.292142][ T1180] kthread+0x3b5/0x4a0 [ 780.296218][ T1180] ? __kthread_bind_mask+0xc0/0xc0 [ 780.303965][ T1180] ret_from_fork+0x1f/0x30 [ 780.308494][ T1180] [ 780.308494][ T1180] Showing all locks held in the system: [ 780.317550][ T1180] 1 lock held by khungtaskd/1180: [ 780.324232][ T1180] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 780.335143][ T1180] 3 locks held by kworker/0:4/3936: [ 780.341295][ T1180] #0: ffff88809a2c4538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 780.353166][ T1180] #1: ffffc90003bd7da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 780.364284][ T1180] #2: ffffffff8b14f0c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 780.374538][ T1180] 1 lock held by in:imklog/6583: [ 780.381602][ T1180] #0: ffff8880960c61b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 780.391770][ T1180] 2 locks held by syz-executor435/6924: [ 780.397343][ T1180] [ 780.400846][ T1180] ============================================= [ 780.400846][ T1180] [ 780.409276][ T1180] NMI backtrace for cpu 0 [ 780.413717][ T1180] CPU: 0 PID: 1180 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 780.422401][ T1180] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.432544][ T1180] Call Trace: [ 780.436001][ T1180] dump_stack+0x198/0x1fd [ 780.440351][ T1180] nmi_cpu_backtrace.cold+0x70/0xb1 [ 780.445633][ T1180] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 780.451273][ T1180] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 780.457339][ T1180] watchdog+0xd7d/0x1000 [ 780.461620][ T1180] ? reset_hung_task_detector+0x30/0x30 [ 780.467167][ T1180] kthread+0x3b5/0x4a0 [ 780.471495][ T1180] ? __kthread_bind_mask+0xc0/0xc0 [ 780.476607][ T1180] ret_from_fork+0x1f/0x30 [ 780.481232][ T1180] Sending NMI from CPU 0 to CPUs 1: [ 780.487802][ C1] NMI backtrace for cpu 1 [ 780.487808][ C1] CPU: 1 PID: 6924 Comm: syz-executor435 Not tainted 5.9.0-rc8-syzkaller #0 [ 780.487814][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.487818][ C1] RIP: 0010:write_comp_data+0x2f/0x80 [ 780.487828][ C1] Code: 05 c6 c4 8b 7e 65 48 8b 34 25 c0 fe 01 00 a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 86 2c 14 00 00 85 c0 74 4f 8b 86 08 14 00 00 <83> f8 03 75 44 48 8b 86 10 14 00 00 8b b6 0c 14 00 00 4c 8b 00 48 [ 780.487831][ C1] RSP: 0018:ffffc900055d6d88 EFLAGS: 00000246 [ 780.487838][ C1] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff83d85da4 [ 780.487843][ C1] RDX: 000000000000003f RSI: ffff888094dce380 RDI: 0000000000000006 [ 780.487848][ C1] RBP: 0000000000000004 R08: 0000000000000000 R09: ffff8880a7018a07 [ 780.487852][ C1] R10: 0000000000000004 R11: 0000000000000000 R12: 000000000000003f [ 780.487857][ C1] R13: 0000000000000001 R14: ffff8880a7018a00 R15: 0000000000000002 [ 780.487862][ C1] FS: 0000000000e49880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 780.487866][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 780.487871][ C1] CR2: 00007f0500036000 CR3: 0000000091501000 CR4: 00000000001506e0 [ 780.487875][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 780.487880][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 780.487882][ C1] Call Trace: [ 780.487886][ C1] __radix_tree_lookup+0xd4/0x290 [ 780.487889][ C1] tcf_idr_check_alloc+0xb0/0x3b0 [ 780.487892][ C1] tcf_police_init+0x347/0x13a0 [ 780.487895][ C1] ? tcf_police_cleanup+0x60/0x60 [ 780.487898][ C1] ? find_held_lock+0x2d/0x110 [ 780.487902][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 780.487905][ C1] tcf_action_init_1+0x1a3/0x990 [ 780.487908][ C1] ? tcf_action_dump_old+0x80/0x80 [ 780.487911][ C1] ? lock_acquire+0x1f3/0xaf0 [ 780.487914][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.487917][ C1] ? find_held_lock+0x2d/0x110 [ 780.487921][ C1] ? fs_reclaim_release+0x90/0xd0 [ 780.487924][ C1] ? mark_lock+0x82/0x1660 [ 780.487927][ C1] tcf_exts_validate+0x138/0x420 [ 780.487930][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 780.487933][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 780.487936][ C1] ? __nla_parse+0x3d/0x4a [ 780.487939][ C1] route4_change+0x6d8/0x2380 [ 780.487943][ C1] ? route4_delete+0xb70/0xb70 [ 780.487946][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.487949][ C1] tc_new_tfilter+0x1398/0x2130 [ 780.487952][ C1] ? route4_delete+0xb70/0xb70 [ 780.487956][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.487959][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.487963][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.487966][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.487969][ C1] ? security_capable+0x8f/0xc0 [ 780.487972][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.487976][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.487979][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 780.487982][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 780.487985][ C1] ? lock_acquire+0x1f3/0xaf0 [ 780.487989][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 780.487992][ C1] netlink_rcv_skb+0x15a/0x430 [ 780.487995][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 780.487998][ C1] ? netlink_ack+0xa10/0xa10 [ 780.488002][ C1] ? __kmalloc_node_track_caller+0x38/0x60 [ 780.488005][ C1] netlink_unicast+0x533/0x7d0 [ 780.488008][ C1] ? netlink_attachskb+0x810/0x810 [ 780.488012][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 780.488015][ C1] ? __check_object_size+0x171/0x3e4 [ 780.488018][ C1] netlink_sendmsg+0x856/0xd90 [ 780.488021][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 780.488024][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 780.488028][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 780.488031][ C1] sock_sendmsg+0xcf/0x120 [ 780.488034][ C1] ____sys_sendmsg+0x331/0x810 [ 780.488037][ C1] ? kernel_sendmsg+0x50/0x50 [ 780.488040][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 780.488043][ C1] ? sock_alloc_file+0x4f/0x190 [ 780.488051][ C1] ? __lock_acquire+0x164a/0x5780 [ 780.488054][ C1] ___sys_sendmsg+0xf3/0x170 [ 780.488057][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 780.488061][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.488064][ C1] ? fs_reclaim_release+0x90/0xd0 [ 780.488068][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.488071][ C1] ? find_held_lock+0x2d/0x110 [ 780.488074][ C1] ? __might_fault+0x11f/0x1d0 [ 780.488077][ C1] ? lock_downgrade+0x830/0x830 [ 780.488080][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.488083][ C1] __sys_sendmmsg+0x195/0x480 [ 780.488087][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 780.488090][ C1] ? find_held_lock+0x2d/0x110 [ 780.488093][ C1] ? __fd_install+0x1b4/0x600 [ 780.488096][ C1] ? alloc_file_pseudo+0x1/0x250 [ 780.488099][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.488102][ C1] ? __fd_install+0x1e6/0x600 [ 780.488105][ C1] ? __sys_socket+0x16d/0x200 [ 780.488108][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.488112][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 780.488115][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 780.488119][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 780.488122][ C1] do_syscall_64+0x2d/0x70 [ 780.488126][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.488128][ C1] RIP: 0033:0x441599 [ 780.488138][ 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 [ 780.488142][ C1] RSP: 002b:00007ffc78906df8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 780.488150][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441599 [ 780.488154][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 780.488159][ C1] RBP: 00007ffc78906e00 R08: 0000000100000000 R09: 0000000100000000 [ 780.488163][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000007d946 [ 780.488168][ C1] R13: 0000000000402470 R14: 0000000000000000 R15: 0000000000000000 [ 780.488173][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 780.497710][ T1180] Kernel panic - not syncing: hung_task: blocked tasks [ 781.101848][ T1180] CPU: 0 PID: 1180 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 781.110171][ T1180] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 781.122217][ T1180] Call Trace: [ 781.125515][ T1180] dump_stack+0x198/0x1fd [ 781.130046][ T1180] panic+0x382/0x7fb [ 781.134001][ T1180] ? __warn_printk+0xf3/0xf3 [ 781.138733][ T1180] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 781.144394][ T1180] ? preempt_schedule_thunk+0x16/0x18 [ 781.149777][ T1180] ? watchdog.cold+0x5/0x16b [ 781.154365][ T1180] ? watchdog+0xa82/0x1000 [ 781.158782][ T1180] watchdog.cold+0x16/0x16b [ 781.163291][ T1180] ? reset_hung_task_detector+0x30/0x30 [ 781.169042][ T1180] kthread+0x3b5/0x4a0 [ 781.173129][ T1180] ? __kthread_bind_mask+0xc0/0xc0 [ 781.186525][ T1180] ret_from_fork+0x1f/0x30 [ 781.192631][ T1180] Kernel Offset: disabled [ 781.196962][ T1180] Rebooting in 86400 seconds..