[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.216' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 511.049842][ T6868] IPVS: ftp: loaded support on port[0] = 21 executing program [ 511.092082][ T6890] netlink: 388 bytes leftover after parsing attributes in process `syz-executor052'. [ 511.111180][ T6891] netlink: 388 bytes leftover after parsing attributes in process `syz-executor052'. [ 780.129444][ T1175] INFO: task kworker/0:0:5 blocked for more than 143 seconds. [ 780.137121][ T1175] Not tainted 5.9.0-rc8-syzkaller #0 [ 780.146460][ T1175] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 780.156056][ T1175] task:kworker/0:0 state:D stack:26760 pid: 5 ppid: 2 flags:0x00004000 [ 780.166410][ T1175] Workqueue: ipv6_addrconf addrconf_verify_work [ 780.173744][ T1175] Call Trace: [ 780.177161][ T1175] __schedule+0xec9/0x2280 [ 780.182966][ T1175] ? io_schedule_timeout+0x140/0x140 [ 780.188464][ T1175] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 780.195964][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.202063][ T1175] ? lockdep_hardirqs_on+0x53/0x100 [ 780.207283][ T1175] schedule+0xd0/0x2a0 [ 780.213798][ T1175] schedule_preempt_disabled+0xf/0x20 [ 780.220027][ T1175] __mutex_lock+0x3e2/0x10e0 [ 780.224651][ T1175] ? addrconf_verify_work+0xa/0x20 [ 780.231038][ T1175] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.236427][ T1175] ? lock_release+0x8f0/0x8f0 [ 780.242468][ T1175] ? lock_downgrade+0x830/0x830 [ 780.247342][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 780.254016][ T1175] ? lock_is_held_type+0xbb/0xf0 [ 780.258992][ T1175] addrconf_verify_work+0xa/0x20 [ 780.265492][ T1175] process_one_work+0x94c/0x1670 [ 780.272441][ T1175] ? lock_release+0x8f0/0x8f0 [ 780.277138][ T1175] ? pwq_dec_nr_in_flight+0x320/0x320 [ 780.283849][ T1175] ? rwlock_bug.part.0+0x90/0x90 [ 780.288801][ T1175] ? lockdep_hardirqs_off+0x96/0xd0 [ 780.295501][ T1175] worker_thread+0x64c/0x1120 [ 780.301098][ T1175] ? process_one_work+0x1670/0x1670 [ 780.306324][ T1175] kthread+0x3b5/0x4a0 [ 780.311767][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 780.316960][ T1175] ret_from_fork+0x1f/0x30 [ 780.322992][ T1175] [ 780.322992][ T1175] Showing all locks held in the system: [ 780.331780][ T1175] 3 locks held by kworker/0:0/5: [ 780.336823][ T1175] #0: ffff88809a010d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 780.349893][ T1175] #1: ffffc90000cbfda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 780.360981][ T1175] #2: ffffffff8b150988 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 780.371141][ T1175] 1 lock held by khungtaskd/1175: [ 780.376169][ T1175] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 780.387310][ T1175] 1 lock held by in:imklog/6569: [ 780.392941][ T1175] #0: ffff8880939f8130 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 780.404243][ T1175] 1 lock held by syz-executor052/6891: [ 780.410482][ T1175] [ 780.412834][ T1175] ============================================= [ 780.412834][ T1175] [ 780.422463][ T1175] NMI backtrace for cpu 0 [ 780.426818][ T1175] CPU: 0 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 780.435914][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.445970][ T1175] Call Trace: [ 780.449424][ T1175] dump_stack+0x198/0x1fd [ 780.453765][ T1175] nmi_cpu_backtrace.cold+0x70/0xb1 [ 780.459038][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 780.464674][ T1175] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 780.470727][ T1175] watchdog+0xd7d/0x1000 [ 780.474976][ T1175] ? reset_hung_task_detector+0x30/0x30 [ 780.480549][ T1175] kthread+0x3b5/0x4a0 [ 780.484619][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 780.489748][ T1175] ret_from_fork+0x1f/0x30 [ 780.494338][ T1175] Sending NMI from CPU 0 to CPUs 1: [ 780.501210][ C1] NMI backtrace for cpu 1 [ 780.501217][ C1] CPU: 1 PID: 6891 Comm: syz-executor052 Not tainted 5.9.0-rc8-syzkaller #0 [ 780.501224][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.501228][ C1] RIP: 0010:___might_sleep+0x16e/0x2f0 [ 780.501240][ C1] Code: 85 d2 0f 84 70 7b 01 00 5b 5d 41 5c 41 5d 41 5e c3 48 c7 c0 e0 6b fc 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 <0f> 85 5f 01 00 00 48 83 3d f4 05 ab 08 00 0f 84 12 01 00 00 9c 58 [ 780.501245][ C1] RSP: 0018:ffffc90005516c60 EFLAGS: 00000246 [ 780.501253][ C1] RAX: 1ffffffff13f8d7c RBX: 0000000000000000 RCX: 0000000000000000 [ 780.501259][ C1] RDX: dffffc0000000000 RSI: ffffffff8a067e80 RDI: ffff88808e0b66f8 [ 780.501264][ C1] RBP: ffffffff888bc5c0 R08: ffffffff868ae5e8 R09: ffff8880a6a83807 [ 780.501270][ C1] R10: ffffed1014d50700 R11: 0000000000000000 R12: 00000000000003a7 [ 780.501275][ C1] R13: 0000000000000000 R14: ffff88808e0b6380 R15: ffff8880a6a83890 [ 780.501281][ C1] FS: 0000000001ef5880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 780.501286][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 780.501291][ C1] CR2: 00007f436360c000 CR3: 00000000973d4000 CR4: 00000000001506e0 [ 780.501297][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 780.501302][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 780.501305][ C1] Call Trace: [ 780.501309][ C1] __mutex_lock+0xa9/0x10e0 [ 780.501313][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 780.501317][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.501321][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 780.501325][ C1] ? wait_for_completion+0x260/0x260 [ 780.501329][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 780.501333][ C1] tcf_police_init+0x347/0x13a0 [ 780.501337][ C1] ? tcf_police_cleanup+0x60/0x60 [ 780.501341][ C1] ? find_held_lock+0x2d/0x110 [ 780.501345][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 780.501349][ C1] tcf_action_init_1+0x1a3/0x990 [ 780.501353][ C1] ? tcf_action_dump_old+0x80/0x80 [ 780.501356][ C1] ? lock_acquire+0x1f3/0xaf0 [ 780.501360][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.501364][ C1] ? find_held_lock+0x2d/0x110 [ 780.501368][ C1] ? fs_reclaim_release+0x90/0xd0 [ 780.501372][ C1] ? mark_lock+0x82/0x1660 [ 780.501375][ C1] tcf_exts_validate+0x138/0x420 [ 780.501379][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 780.501384][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 780.501387][ C1] ? __nla_parse+0x3d/0x4a [ 780.501391][ C1] route4_change+0x6d8/0x2380 [ 780.501395][ C1] ? route4_delete+0xb70/0xb70 [ 780.501398][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.501402][ C1] tc_new_tfilter+0x1398/0x2130 [ 780.501406][ C1] ? route4_delete+0xb70/0xb70 [ 780.501410][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.501415][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.501419][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.501423][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.501427][ C1] ? security_capable+0x8f/0xc0 [ 780.501431][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.501434][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.501438][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 780.501443][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 780.501446][ C1] ? lock_acquire+0x1f3/0xaf0 [ 780.501450][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 780.501454][ C1] netlink_rcv_skb+0x15a/0x430 [ 780.501458][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 780.501462][ C1] ? netlink_ack+0xa10/0xa10 [ 780.501466][ C1] ? __kmalloc_node_track_caller+0x38/0x60 [ 780.501470][ C1] netlink_unicast+0x533/0x7d0 [ 780.501474][ C1] ? netlink_attachskb+0x810/0x810 [ 780.501479][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 780.501483][ C1] ? __check_object_size+0x171/0x3e4 [ 780.501487][ C1] netlink_sendmsg+0x856/0xd90 [ 780.501491][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 780.501495][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 780.501498][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 780.501502][ C1] sock_sendmsg+0xcf/0x120 [ 780.501506][ C1] ____sys_sendmsg+0x331/0x810 [ 780.501510][ C1] ? kernel_sendmsg+0x50/0x50 [ 780.501513][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 780.501517][ C1] ? sock_alloc_file+0x4f/0x190 [ 780.501521][ C1] ? __lock_acquire+0x164a/0x5780 [ 780.501525][ C1] ___sys_sendmsg+0xf3/0x170 [ 780.501529][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 780.501533][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 780.501537][ C1] ? fs_reclaim_release+0x90/0xd0 [ 780.501541][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.501545][ C1] ? find_held_lock+0x2d/0x110 [ 780.501549][ C1] ? __might_fault+0x11f/0x1d0 [ 780.501552][ C1] ? lock_downgrade+0x830/0x830 [ 780.501556][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.501560][ C1] __sys_sendmmsg+0x195/0x480 [ 780.501564][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 780.501568][ C1] ? find_held_lock+0x2d/0x110 [ 780.501572][ C1] ? __fd_install+0x1b4/0x600 [ 780.501576][ C1] ? alloc_file_pseudo+0x1/0x250 [ 780.501580][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.501584][ C1] ? __fd_install+0x1e6/0x600 [ 780.501588][ C1] ? __sys_socket+0x16d/0x200 [ 780.501592][ C1] ? lock_is_held_type+0xbb/0xf0 [ 780.501596][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 780.501600][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 780.501605][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 780.501609][ C1] do_syscall_64+0x2d/0x70 [ 780.501613][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.501617][ C1] RIP: 0033:0x441599 [ 780.501629][ 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 [ 780.501633][ C1] RSP: 002b:00007ffea37db648 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 780.501643][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441599 [ 780.501649][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 780.501655][ C1] RBP: 00007ffea37db650 R08: 0000000100000000 R09: 0000000100000000 [ 780.501661][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000007cc75 [ 780.501666][ C1] R13: 0000000000402470 R14: 0000000000000000 R15: 0000000000000000 [ 780.501673][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 780.519298][ T1175] Kernel panic - not syncing: hung_task: blocked tasks [ 781.118968][ T1175] CPU: 0 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 781.127250][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 781.137304][ T1175] Call Trace: [ 781.140909][ T1175] dump_stack+0x198/0x1fd [ 781.145414][ T1175] panic+0x382/0x7fb [ 781.149868][ T1175] ? __warn_printk+0xf3/0xf3 [ 781.154511][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 781.160337][ T1175] ? preempt_schedule_thunk+0x16/0x18 [ 781.165715][ T1175] ? watchdog.cold+0x5/0x16b [ 781.170315][ T1175] ? watchdog+0xa82/0x1000 [ 781.174757][ T1175] watchdog.cold+0x16/0x16b [ 781.179268][ T1175] ? reset_hung_task_detector+0x30/0x30 [ 781.184829][ T1175] kthread+0x3b5/0x4a0 [ 781.188926][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 781.194037][ T1175] ret_from_fork+0x1f/0x30 [ 781.199964][ T1175] Kernel Offset: disabled [ 781.204320][ T1175] Rebooting in 86400 seconds..