[ 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 '10.128.10.59' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 499.288514][ T6861] IPVS: ftp: loaded support on port[0] = 21 [ 499.327990][ T6883] netlink: 8 bytes leftover after parsing attributes in process `syz-executor490'. [ 499.337905][ T6883] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor490'. [ 499.348984][ T6883] netlink: 8 bytes leftover after parsing attributes in process `syz-executor490'. [ 499.358373][ T6883] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor490'. [ 657.173384][ T1169] INFO: task kworker/0:1:6853 blocked for more than 143 seconds. [ 657.181269][ T1169] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.192446][ T1169] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.201926][ T1169] task:kworker/0:1 state:D stack:29856 pid: 6853 ppid: 2 flags:0x00004000 [ 657.212074][ T1169] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.219159][ T1169] Call Trace: [ 657.222512][ T1169] __schedule+0xec9/0x2280 [ 657.228062][ T1169] ? io_schedule_timeout+0x140/0x140 [ 657.234259][ T1169] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.240269][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.246678][ T1169] ? lockdep_hardirqs_on+0x53/0x100 [ 657.251882][ T1169] schedule+0xd0/0x2a0 [ 657.258050][ T1169] schedule_preempt_disabled+0xf/0x20 [ 657.264092][ T1169] __mutex_lock+0x3e2/0x10e0 [ 657.268699][ T1169] ? addrconf_verify_work+0xa/0x20 [ 657.274948][ T1169] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.280326][ T1169] ? lock_release+0x8f0/0x8f0 [ 657.286066][ T1169] ? lock_downgrade+0x830/0x830 [ 657.290925][ T1169] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.297285][ T1169] ? lock_is_held_type+0xbb/0xf0 [ 657.302229][ T1169] addrconf_verify_work+0xa/0x20 [ 657.308326][ T1169] process_one_work+0x94c/0x1670 [ 657.315237][ T1169] ? lock_release+0x8f0/0x8f0 [ 657.319919][ T1169] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.326399][ T1169] ? rwlock_bug.part.0+0x90/0x90 [ 657.331342][ T1169] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.337706][ T1169] worker_thread+0x64c/0x1120 [ 657.342402][ T1169] ? __kthread_parkme+0x13f/0x1e0 [ 657.348548][ T1169] ? process_one_work+0x1670/0x1670 [ 657.354600][ T1169] kthread+0x3b5/0x4a0 [ 657.358675][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 657.364984][ T1169] ret_from_fork+0x1f/0x30 [ 657.369479][ T1169] [ 657.369479][ T1169] Showing all locks held in the system: [ 657.378396][ T1169] 1 lock held by khungtaskd/1169: [ 657.384922][ T1169] #0: ffffffff8a068480 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.395498][ T1169] 1 lock held by in:imklog/6547: [ 657.400429][ T1169] #0: ffff88809d8ae5f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.410841][ T1169] 3 locks held by kworker/0:1/6853: [ 657.417193][ T1169] #0: ffff88809a259138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.428857][ T1169] #1: ffffc900059c7da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.440012][ T1169] #2: ffffffff8b17bcc8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.451232][ T1169] 1 lock held by syz-executor490/6883: [ 657.457399][ T1169] [ 657.459726][ T1169] ============================================= [ 657.459726][ T1169] [ 657.469276][ T1169] NMI backtrace for cpu 0 [ 657.473712][ T1169] CPU: 0 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.481934][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.491975][ T1169] Call Trace: [ 657.495386][ T1169] dump_stack+0x198/0x1fd [ 657.499715][ T1169] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.504949][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.510573][ T1169] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.516621][ T1169] watchdog+0xd7d/0x1000 [ 657.521821][ T1169] ? reset_hung_task_detector+0x30/0x30 [ 657.527361][ T1169] kthread+0x3b5/0x4a0 [ 657.531420][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 657.536527][ T1169] ret_from_fork+0x1f/0x30 [ 657.541099][ T1169] Sending NMI from CPU 0 to CPUs 1: [ 657.548976][ C1] NMI backtrace for cpu 1 [ 657.548983][ C1] CPU: 1 PID: 6883 Comm: syz-executor490 Not tainted 5.9.0-rc8-syzkaller #0 [ 657.548989][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.548993][ C1] RIP: 0010:check_memory_region+0x16/0x180 [ 657.549005][ C1] Code: 02 0f 1f 00 48 89 f2 be f8 00 00 00 e9 53 f7 24 02 0f 1f 00 48 85 f6 0f 84 70 01 00 00 49 89 f9 41 54 44 0f b6 c2 49 01 f1 55 <53> 0f 82 18 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 48 39 c7 0f 86 [ 657.549009][ C1] RSP: 0018:ffffc90005a36988 EFLAGS: 00000082 [ 657.549017][ C1] RAX: 0000000000000018 RBX: 0000000000000611 RCX: ffffffff815bcab0 [ 657.549022][ C1] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8d113aa0 [ 657.549027][ C1] RBP: ffff888093e7e080 R08: 0000000000000000 R09: ffffffff8d113aa8 [ 657.549032][ C1] R10: fffffbfff1a22754 R11: 0000000000000000 R12: ffff888093e7e9b0 [ 657.549038][ C1] R13: ffff888093e7e9d2 R14: 0000000000000000 R15: ffff888093e7e988 [ 657.549044][ C1] FS: 0000000001a01880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 657.549048][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.549053][ C1] CR2: 00007f0be9997000 CR3: 00000000a4675000 CR4: 00000000001506e0 [ 657.549059][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.549064][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.549066][ C1] Call Trace: [ 657.549070][ C1] __lock_acquire+0xfa0/0x5780 [ 657.549073][ C1] ? _raw_spin_unlock_irq+0x55/0x80 [ 657.549077][ C1] ? finish_task_switch+0x150/0x790 [ 657.549081][ C1] ? finish_task_switch+0x122/0x790 [ 657.549090][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.549093][ C1] ? __schedule+0xed1/0x2280 [ 657.549096][ C1] lock_acquire+0x1f3/0xaf0 [ 657.549100][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.549103][ C1] ? lockdep_hardirqs_on+0x53/0x100 [ 657.549107][ C1] ? lock_release+0x8f0/0x8f0 [ 657.549110][ C1] ? preempt_schedule_thunk+0x16/0x18 [ 657.549114][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.549117][ C1] __mutex_lock+0x134/0x10e0 [ 657.549121][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.549125][ C1] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 657.549129][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.549132][ C1] ? lockdep_hardirqs_on+0x53/0x100 [ 657.549137][ C1] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 657.549140][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.549144][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 657.549148][ C1] ? __radix_tree_lookup+0xa2/0x290 [ 657.549151][ C1] ? wait_for_completion+0x260/0x260 [ 657.549155][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 657.549158][ C1] tcf_police_init+0x347/0x13a0 [ 657.549162][ C1] ? tcf_police_cleanup+0x60/0x60 [ 657.549165][ C1] ? find_held_lock+0x2d/0x110 [ 657.549169][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 657.549172][ C1] tcf_action_init_1+0x1a3/0x990 [ 657.549176][ C1] ? tcf_action_dump_old+0x80/0x80 [ 657.549179][ C1] ? lock_acquire+0x1f3/0xaf0 [ 657.549182][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.549186][ C1] ? find_held_lock+0x2d/0x110 [ 657.549189][ C1] ? fs_reclaim_release+0x90/0xd0 [ 657.549193][ C1] ? mark_lock+0x82/0x1660 [ 657.549196][ C1] tcf_exts_validate+0x138/0x420 [ 657.549200][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 657.549203][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 657.549207][ C1] ? __nla_parse+0x3d/0x4a [ 657.549210][ C1] rsvp_change+0x291/0x2990 [ 657.549213][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.549217][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.549220][ C1] ? find_held_lock+0x2d/0x110 [ 657.549224][ C1] ? tc_new_tfilter+0x1be4/0x2130 [ 657.549228][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.549231][ C1] ? lock_downgrade+0x830/0x830 [ 657.549235][ C1] ? blackhole_dequeue+0x10/0x10 [ 657.549238][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.549241][ C1] tc_new_tfilter+0x1398/0x2130 [ 657.549245][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.549249][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.549253][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.549257][ C1] ? is_bpf_text_address+0xcb/0x160 [ 657.549260][ C1] ? kernel_text_address+0xbd/0xf0 [ 657.549264][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.549267][ C1] ? security_capable+0x8f/0xc0 [ 657.549271][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.549274][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.549277][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 657.549281][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.549284][ C1] ? lock_acquire+0x1f3/0xaf0 [ 657.549287][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 657.549290][ C1] netlink_rcv_skb+0x153/0x420 [ 657.549294][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.549297][ C1] ? netlink_ack+0xaa0/0xaa0 [ 657.549299][ C1] netlink_unicast+0x533/0x7d0 [ 657.549303][ C1] ? netlink_attachskb+0x810/0x810 [ 657.549306][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 657.549309][ C1] ? __check_object_size+0x171/0x3e4 [ 657.549312][ C1] netlink_sendmsg+0x856/0xd90 [ 657.549315][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.549319][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 657.549322][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.549325][ C1] sock_sendmsg+0xcf/0x120 [ 657.549327][ C1] ____sys_sendmsg+0x331/0x810 [ 657.549330][ C1] ? kernel_sendmsg+0x50/0x50 [ 657.549333][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 657.549337][ C1] ? sock_alloc_file+0x4f/0x190 [ 657.549340][ C1] ? __lock_acquire+0x164a/0x5780 [ 657.549343][ C1] ___sys_sendmsg+0xf3/0x170 [ 657.549346][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 657.549350][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.549353][ C1] ? fs_reclaim_release+0x90/0xd0 [ 657.549356][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.549360][ C1] ? find_held_lock+0x2d/0x110 [ 657.549363][ C1] ? __might_fault+0x11f/0x1d0 [ 657.549366][ C1] ? lock_downgrade+0x830/0x830 [ 657.549369][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.549372][ C1] __sys_sendmmsg+0x195/0x480 [ 657.549375][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 657.549378][ C1] ? find_held_lock+0x2d/0x110 [ 657.549381][ C1] ? __fd_install+0x1b4/0x600 [ 657.549384][ C1] ? alloc_file_pseudo+0x1/0x250 [ 657.549387][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.549390][ C1] ? __fd_install+0x1e6/0x600 [ 657.549393][ C1] ? __sys_socket+0x16d/0x200 [ 657.549396][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.549400][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.549402][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 657.549406][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.549409][ C1] do_syscall_64+0x2d/0x70 [ 657.549412][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.549415][ C1] RIP: 0033:0x4418c9 [ 657.549426][ 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 [ 657.549430][ C1] RSP: 002b:00007ffe6a0532b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 657.549438][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004418c9 [ 657.549443][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 657.549447][ C1] RBP: 00007ffe6a0532c0 R08: 0000000120080522 R09: 0000000120080522 [ 657.549452][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a3ed0 [ 657.549457][ C1] R13: 00000000004027a0 R14: 0000000000000000 R15: 0000000000000000 [ 657.549462][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 657.554679][ T1169] Kernel panic - not syncing: hung_task: blocked tasks [ 658.281187][ T1169] CPU: 0 PID: 1169 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 658.289407][ T1169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.299445][ T1169] Call Trace: [ 658.302736][ T1169] dump_stack+0x198/0x1fd [ 658.307124][ T1169] panic+0x382/0x7fb [ 658.311015][ T1169] ? __warn_printk+0xf3/0xf3 [ 658.315600][ T1169] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.322178][ T1169] ? preempt_schedule_thunk+0x16/0x18 [ 658.327544][ T1169] ? watchdog.cold+0x5/0x16b [ 658.332123][ T1169] ? watchdog+0xa82/0x1000 [ 658.336538][ T1169] watchdog.cold+0x16/0x16b [ 658.341038][ T1169] ? reset_hung_task_detector+0x30/0x30 [ 658.346575][ T1169] kthread+0x3b5/0x4a0 [ 658.350634][ T1169] ? __kthread_bind_mask+0xc0/0xc0 [ 658.355737][ T1169] ret_from_fork+0x1f/0x30 [ 658.361571][ T1169] Kernel Offset: disabled [ 658.365912][ T1169] Rebooting in 86400 seconds..