[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.15.201' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 630.591544][ T6895] IPVS: ftp: loaded support on port[0] = 21 [ 630.632096][ T6917] netlink: 8 bytes leftover after parsing attributes in process `syz-executor422'. [ 630.642672][ T6917] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor422'. [ 630.654027][ T6917] netlink: 8 bytes leftover after parsing attributes in process `syz-executor422'. [ 630.664182][ T6917] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor422'. [ 902.906808][ T1175] INFO: task kworker/0:0:6887 blocked for more than 143 seconds. [ 902.914708][ T1175] Not tainted 5.9.0-rc6-syzkaller #0 [ 902.922244][ T1175] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 902.931680][ T1175] task:kworker/0:0 state:D stack:29288 pid: 6887 ppid: 2 flags:0x00004000 [ 902.941755][ T1175] Workqueue: ipv6_addrconf addrconf_verify_work [ 902.948794][ T1175] Call Trace: [ 902.952132][ T1175] __schedule+0xec9/0x2280 [ 902.958772][ T1175] ? io_schedule_timeout+0x140/0x140 [ 902.964098][ T1175] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 902.971345][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 902.976604][ T1175] ? lockdep_hardirqs_on+0x53/0x100 [ 902.982903][ T1175] schedule+0xd0/0x2a0 [ 902.987716][ T1175] schedule_preempt_disabled+0xf/0x20 [ 902.993094][ T1175] __mutex_lock+0x3e2/0x10e0 [ 902.998769][ T1175] ? addrconf_verify_work+0xa/0x20 [ 903.003899][ T1175] ? mutex_lock_io_nested+0xf60/0xf60 [ 903.010529][ T1175] ? lock_release+0x8f0/0x8f0 [ 903.015575][ T1175] ? lock_downgrade+0x830/0x830 [ 903.022419][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 903.028391][ T1175] ? lock_is_held_type+0xbb/0xf0 [ 903.033341][ T1175] addrconf_verify_work+0xa/0x20 [ 903.039389][ T1175] process_one_work+0x94c/0x1670 [ 903.044339][ T1175] ? lock_release+0x8f0/0x8f0 [ 903.050241][ T1175] ? pwq_dec_nr_in_flight+0x320/0x320 [ 903.055625][ T1175] ? rwlock_bug.part.0+0x90/0x90 [ 903.061741][ T1175] ? lockdep_hardirqs_off+0x96/0xd0 [ 903.067906][ T1175] worker_thread+0x64c/0x1120 [ 903.072610][ T1175] ? __kthread_parkme+0x13f/0x1e0 [ 903.078852][ T1175] ? process_one_work+0x1670/0x1670 [ 903.084055][ T1175] kthread+0x3b5/0x4a0 [ 903.090417][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 903.095544][ T1175] ret_from_fork+0x1f/0x30 [ 903.101154][ T1175] [ 903.101154][ T1175] Showing all locks held in the system: [ 903.109698][ T1175] 1 lock held by khungtaskd/1175: [ 903.114719][ T1175] #0: ffffffff8a067f00 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 903.126612][ T1175] 1 lock held by in:imklog/6742: [ 903.131545][ T1175] #0: ffff8880974f43b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 903.141986][ T1175] 3 locks held by kworker/0:0/6887: [ 903.147965][ T1175] #0: ffff888099b95938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 903.159639][ T1175] #1: ffffc90000f07da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 903.170601][ T1175] #2: ffffffff8b14d648 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 903.180868][ T1175] 1 lock held by syz-executor422/6917: [ 903.186339][ T1175] [ 903.189856][ T1175] ============================================= [ 903.189856][ T1175] [ 903.199001][ T1175] NMI backtrace for cpu 0 [ 903.203332][ T1175] CPU: 0 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 903.211638][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 903.221682][ T1175] Call Trace: [ 903.225059][ T1175] dump_stack+0x198/0x1fd [ 903.229386][ T1175] nmi_cpu_backtrace.cold+0x70/0xb1 [ 903.234585][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 903.240210][ T1175] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 903.246181][ T1175] watchdog+0xd7d/0x1000 [ 903.250423][ T1175] ? reset_hung_task_detector+0x30/0x30 [ 903.255960][ T1175] kthread+0x3b5/0x4a0 [ 903.260022][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 903.265126][ T1175] ret_from_fork+0x1f/0x30 [ 903.269720][ T1175] Sending NMI from CPU 0 to CPUs 1: [ 903.276086][ C1] NMI backtrace for cpu 1 [ 903.276093][ C1] CPU: 1 PID: 6917 Comm: syz-executor422 Not tainted 5.9.0-rc6-syzkaller #0 [ 903.276099][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 903.276102][ C1] RIP: 0010:__mutex_lock+0x64e/0x10e0 [ 903.276114][ C1] Code: 28 f9 65 8b 05 13 8e d9 77 85 c0 0f 84 c6 05 00 00 45 31 c0 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 28 48 c7 00 00 00 00 00 <48> c7 40 08 00 00 00 00 48 c7 40 10 00 00 00 00 48 8b 84 24 30 01 [ 903.276118][ C1] RSP: 0018:ffffc900054a6be0 EFLAGS: 00000286 [ 903.276126][ C1] RAX: fffff52000a94d87 RBX: ffff888092d7a040 RCX: 0000000000000000 [ 903.276131][ C1] RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000001 [ 903.276136][ C1] RBP: ffff88809eccfa00 R08: 0000000000000000 R09: ffff88809eccfa07 [ 903.276142][ C1] R10: ffffed1013d99f40 R11: 0000000000000000 R12: fffffbfff16b3317 [ 903.276147][ C1] R13: ffff888092d7a040 R14: dffffc0000000000 R15: 0000000000000000 [ 903.276152][ C1] FS: 000000000107e880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 903.276157][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 903.276162][ C1] CR2: 00007f863cbaf000 CR3: 00000000a2861000 CR4: 00000000001506e0 [ 903.276167][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 903.276172][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 903.276175][ C1] Call Trace: [ 903.276178][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 903.276182][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 903.276186][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 903.276189][ C1] ? wait_for_completion+0x260/0x260 [ 903.276193][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 903.276196][ C1] tcf_police_init+0x347/0x13a0 [ 903.276200][ C1] ? tcf_police_cleanup+0x60/0x60 [ 903.276203][ C1] ? find_held_lock+0x2d/0x110 [ 903.276207][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 903.276210][ C1] tcf_action_init_1+0x1a3/0x990 [ 903.276214][ C1] ? tcf_action_dump_old+0x80/0x80 [ 903.276217][ C1] ? lock_acquire+0x1f3/0xaf0 [ 903.276220][ C1] ? lock_is_held_type+0xbb/0xf0 [ 903.276224][ C1] ? find_held_lock+0x2d/0x110 [ 903.276227][ C1] ? fs_reclaim_release+0x90/0xd0 [ 903.276231][ C1] ? mark_lock+0x82/0x1660 [ 903.276234][ C1] tcf_exts_validate+0x138/0x420 [ 903.276237][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 903.276241][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 903.276244][ C1] ? __nla_parse+0x3d/0x4a [ 903.276248][ C1] rsvp_change+0x291/0x2990 [ 903.276251][ C1] ? lock_is_held_type+0xbb/0xf0 [ 903.276255][ C1] ? lock_is_held_type+0xbb/0xf0 [ 903.276258][ C1] ? find_held_lock+0x2d/0x110 [ 903.276262][ C1] ? tc_new_tfilter+0x1be4/0x2130 [ 903.276265][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 903.276269][ C1] ? lock_downgrade+0x830/0x830 [ 903.276272][ C1] ? blackhole_dequeue+0x10/0x10 [ 903.276276][ C1] ? lock_is_held_type+0xbb/0xf0 [ 903.276279][ C1] tc_new_tfilter+0x1398/0x2130 [ 903.276283][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 903.276286][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 903.276290][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 903.276294][ C1] ? is_bpf_text_address+0xcb/0x160 [ 903.276298][ C1] ? kernel_text_address+0xbd/0xf0 [ 903.276301][ C1] ? lock_is_held_type+0xbb/0xf0 [ 903.276305][ C1] ? security_capable+0x8f/0xc0 [ 903.276308][ C1] ? lock_is_held_type+0xbb/0xf0 [ 903.276312][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 903.276315][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 903.276319][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 903.276322][ C1] ? lock_acquire+0x1f3/0xaf0 [ 903.276326][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 903.276330][ C1] netlink_rcv_skb+0x15a/0x430 [ 903.276333][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 903.276337][ C1] ? netlink_ack+0xa10/0xa10 [ 903.276340][ C1] netlink_unicast+0x533/0x7d0 [ 903.276344][ C1] ? netlink_attachskb+0x810/0x810 [ 903.276347][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 903.276351][ C1] ? __check_object_size+0x171/0x3e4 [ 903.276354][ C1] netlink_sendmsg+0x856/0xd90 [ 903.276358][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 903.276361][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 903.276365][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 903.276368][ C1] sock_sendmsg+0xcf/0x120 [ 903.276371][ C1] ____sys_sendmsg+0x331/0x810 [ 903.276375][ C1] ? kernel_sendmsg+0x50/0x50 [ 903.276378][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 903.276381][ C1] ? sock_alloc_file+0x4f/0x190 [ 903.276385][ C1] ? __lock_acquire+0x164a/0x5780 [ 903.276388][ C1] ___sys_sendmsg+0xf3/0x170 [ 903.276392][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 903.276396][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 903.276400][ C1] ? fs_reclaim_release+0x90/0xd0 [ 903.276403][ C1] ? lock_is_held_type+0xbb/0xf0 [ 903.276406][ C1] ? find_held_lock+0x2d/0x110 [ 903.276410][ C1] ? __might_fault+0x11f/0x1d0 [ 903.276413][ C1] ? lock_downgrade+0x830/0x830 [ 903.276417][ C1] ? lock_is_held_type+0xbb/0xf0 [ 903.276420][ C1] __sys_sendmmsg+0x195/0x480 [ 903.276424][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 903.276427][ C1] ? find_held_lock+0x2d/0x110 [ 903.276430][ C1] ? __fd_install+0x1b4/0x600 [ 903.276434][ C1] ? alloc_file_pseudo+0x1/0x250 [ 903.276437][ C1] ? lock_is_held_type+0xbb/0xf0 [ 903.276441][ C1] ? __fd_install+0x1e6/0x600 [ 903.276444][ C1] ? __sys_socket+0x16d/0x200 [ 903.276447][ C1] ? lock_is_held_type+0xbb/0xf0 [ 903.276451][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 903.276455][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 903.276459][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 903.276462][ C1] do_syscall_64+0x2d/0x70 [ 903.276466][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 903.276469][ C1] RIP: 0033:0x441599 [ 903.276481][ 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 [ 903.276484][ C1] RSP: 002b:00007ffd420684c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 903.276493][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441599 [ 903.276498][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 903.276503][ C1] RBP: 00007ffd420684d0 R08: 0000000120080522 R09: 0000000120080522 [ 903.276509][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a3bb0 [ 903.276514][ C1] R13: 0000000000402470 R14: 0000000000000000 R15: 0000000000000000 [ 903.276524][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 903.296575][ T1175] Kernel panic - not syncing: hung_task: blocked tasks [ 903.913155][ T1175] CPU: 0 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 903.921377][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 903.931423][ T1175] Call Trace: [ 903.934712][ T1175] dump_stack+0x198/0x1fd [ 903.939041][ T1175] panic+0x382/0x7fb [ 903.942931][ T1175] ? __warn_printk+0xf3/0xf3 [ 903.947520][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 903.953141][ T1175] ? preempt_schedule_thunk+0x16/0x18 [ 903.958509][ T1175] ? watchdog.cold+0x5/0x16b [ 903.963090][ T1175] ? watchdog+0xa82/0x1000 [ 903.967501][ T1175] watchdog.cold+0x16/0x16b [ 903.972005][ T1175] ? reset_hung_task_detector+0x30/0x30 [ 903.977543][ T1175] kthread+0x3b5/0x4a0 [ 903.981601][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 903.986718][ T1175] ret_from_fork+0x1f/0x30 [ 903.992763][ T1175] Kernel Offset: disabled [ 903.997278][ T1175] Rebooting in 86400 seconds..