[ 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 '10.128.10.12' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 505.834825][ T8522] IPVS: ftp: loaded support on port[0] = 21 [ 658.049866][ T1659] INFO: task kworker/0:1:8514 blocked for more than 143 seconds. [ 658.057776][ T1659] Not tainted 5.9.0-syzkaller #0 [ 658.067233][ T1659] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 658.076815][ T1659] task:kworker/0:1 state:D stack:29448 pid: 8514 ppid: 2 flags:0x00004000 [ 658.087005][ T1659] Workqueue: ipv6_addrconf addrconf_verify_work [ 658.094139][ T1659] Call Trace: [ 658.097494][ T1659] __schedule+0x893/0x2130 [ 658.104303][ T1659] ? io_schedule_timeout+0x140/0x140 [ 658.110558][ T1659] ? _raw_spin_unlock_irq+0x1f/0x40 [ 658.115812][ T1659] ? lockdep_hardirqs_on+0x85/0x110 [ 658.122270][ T1659] schedule+0xcf/0x270 [ 658.126359][ T1659] schedule_preempt_disabled+0xf/0x20 [ 658.132959][ T1659] __mutex_lock+0x3e2/0x10e0 [ 658.137581][ T1659] ? addrconf_verify_work+0xa/0x20 [ 658.144020][ T1659] ? mutex_lock_io_nested+0xf60/0xf60 [ 658.149516][ T1659] ? lock_release+0x710/0x710 [ 658.155491][ T1659] ? lock_downgrade+0x6d0/0x6d0 [ 658.161172][ T1659] addrconf_verify_work+0xa/0x20 [ 658.166177][ T1659] process_one_work+0x933/0x15a0 [ 658.172407][ T1659] ? lock_release+0x710/0x710 [ 658.177098][ T1659] ? pwq_dec_nr_in_flight+0x320/0x320 [ 658.184060][ T1659] ? rwlock_bug.part.0+0x90/0x90 [ 658.189017][ T1659] ? _raw_spin_lock_irq+0x41/0x50 [ 658.195283][ T1659] worker_thread+0x64c/0x1120 [ 658.200781][ T1659] ? __kthread_parkme+0x13f/0x1e0 [ 658.205813][ T1659] ? process_one_work+0x15a0/0x15a0 [ 658.212235][ T1659] kthread+0x3af/0x4a0 [ 658.216315][ T1659] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 658.223574][ T1659] ret_from_fork+0x1f/0x30 [ 658.228110][ T1659] [ 658.228110][ T1659] Showing all locks held in the system: [ 658.238363][ T1659] 1 lock held by khungtaskd/1659: [ 658.244245][ T1659] #0: ffffffff8b337060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 658.256020][ T1659] 1 lock held by in:imklog/8196: [ 658.261768][ T1659] #0: ffff88801d592870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 658.271845][ T1659] 3 locks held by kworker/0:1/8514: [ 658.277043][ T1659] #0: ffff888147442d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 [ 658.289327][ T1659] #1: ffffc900018cfda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 [ 658.300599][ T1659] #2: ffffffff8c927f08 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 658.310907][ T1659] 1 lock held by syz-executor412/8543: [ 658.316401][ T1659] [ 658.318724][ T1659] ============================================= [ 658.318724][ T1659] [ 658.328992][ T1659] NMI backtrace for cpu 0 [ 658.333459][ T1659] CPU: 0 PID: 1659 Comm: khungtaskd Not tainted 5.9.0-syzkaller #0 [ 658.341349][ T1659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.351403][ T1659] Call Trace: [ 658.354733][ T1659] dump_stack+0x107/0x163 [ 658.359112][ T1659] nmi_cpu_backtrace.cold+0x44/0xd7 [ 658.364411][ T1659] ? lapic_can_unplug_cpu+0x80/0x80 [ 658.369674][ T1659] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 658.375840][ T1659] watchdog+0xd43/0xfa0 [ 658.380010][ T1659] ? reset_hung_task_detector+0x30/0x30 [ 658.385557][ T1659] kthread+0x3af/0x4a0 [ 658.389629][ T1659] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 658.395529][ T1659] ret_from_fork+0x1f/0x30 [ 658.400119][ T1659] Sending NMI from CPU 0 to CPUs 1: [ 658.406574][ C1] NMI backtrace for cpu 1 [ 658.406580][ C1] CPU: 1 PID: 8543 Comm: syz-executor412 Not tainted 5.9.0-syzkaller #0 [ 658.406586][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.406590][ C1] RIP: 0010:lock_release+0xa9/0x710 [ 658.406601][ C1] Code: 07 0f 87 d0 04 00 00 89 db be 08 00 00 00 48 89 d8 48 c1 f8 06 48 8d 3c c5 88 ae ec 8c e8 8f 39 5b 00 48 0f a3 1d df 8e 96 0b <0f> 82 4e 04 00 00 48 c7 c3 5c e0 ec 8c 48 b8 00 00 00 00 00 fc ff [ 658.406605][ C1] RSP: 0018:ffffc90001456b60 EFLAGS: 00000247 [ 658.406614][ C1] RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff81561fa1 [ 658.406620][ C1] RDX: fffffbfff19d95d2 RSI: 0000000000000008 RDI: ffffffff8cecae88 [ 658.406625][ C1] RBP: 1ffff9200028ad6e R08: 0000000000000000 R09: ffffffff8cecae8f [ 658.406630][ C1] R10: fffffbfff19d95d1 R11: 0000000000000000 R12: ffff88802181ae68 [ 658.406635][ C1] R13: 0000000000000001 R14: 1ffff9200028ad89 R15: ffff88802181ae00 [ 658.406640][ C1] FS: 00000000011ec880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 658.406645][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 658.406650][ C1] CR2: 00007f7712a6c000 CR3: 000000001681e000 CR4: 00000000001506e0 [ 658.406655][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 658.406659][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 658.406662][ C1] Call Trace: [ 658.406666][ C1] ? tcf_idr_check_alloc+0x29e/0x3b0 [ 658.406670][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 658.406673][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 658.406677][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 658.406681][ C1] __mutex_unlock_slowpath+0x81/0x610 [ 658.406684][ C1] ? wait_for_completion+0x260/0x260 [ 658.406688][ C1] tcf_idr_check_alloc+0x29e/0x3b0 [ 658.406692][ C1] tcf_police_init+0x347/0x13a0 [ 658.406695][ C1] ? tcf_police_cleanup+0x60/0x60 [ 658.406699][ C1] ? find_held_lock+0x2d/0x110 [ 658.406702][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 658.406706][ C1] ? lockdep_hardirqs_on_prepare+0x410/0x410 [ 658.406710][ C1] tcf_action_init_1+0x1a3/0x990 [ 658.406713][ C1] ? tcf_action_dump_old+0x80/0x80 [ 658.406717][ C1] ? find_held_lock+0x2d/0x110 [ 658.406720][ C1] ? pcpu_alloc+0x1239/0x16f0 [ 658.406724][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 658.406727][ C1] tcf_exts_validate+0x138/0x420 [ 658.406731][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 658.406735][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 658.406738][ C1] ? wait_for_completion+0x260/0x260 [ 658.406742][ C1] u32_set_parms+0xb9/0xc70 [ 658.406746][ C1] ? rcu_read_lock_sched_held+0x3a/0x70 [ 658.406749][ C1] ? u32_bind_class+0x2c0/0x2c0 [ 658.406752][ C1] u32_change+0x1f0d/0x3000 [ 658.406756][ C1] ? u32_dump+0xfd0/0xfd0 [ 658.406759][ C1] ? blackhole_dequeue+0x10/0x10 [ 658.406763][ C1] ? u32_lookup_ht+0x1d0/0x1d0 [ 658.406766][ C1] tc_new_tfilter+0x1398/0x2130 [ 658.406769][ C1] ? u32_dump+0xfd0/0xfd0 [ 658.406773][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 658.406777][ C1] ? lock_chain_count+0x20/0x20 [ 658.406786][ C1] ? kernel_text_address+0xbd/0xf0 [ 658.406790][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 658.406794][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 658.406797][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 658.406801][ C1] netlink_rcv_skb+0x153/0x420 [ 658.406805][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 658.406808][ C1] ? netlink_ack+0xaa0/0xaa0 [ 658.406812][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 658.406816][ C1] netlink_unicast+0x533/0x7d0 [ 658.406819][ C1] ? netlink_attachskb+0x810/0x810 [ 658.406823][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 658.406827][ C1] ? __check_object_size+0x171/0x3f0 [ 658.406830][ C1] netlink_sendmsg+0x856/0xd90 [ 658.406834][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 658.406837][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 658.406841][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 658.406844][ C1] sock_sendmsg+0xcf/0x120 [ 658.406848][ C1] ____sys_sendmsg+0x331/0x810 [ 658.406851][ C1] ? kernel_sendmsg+0x50/0x50 [ 658.406855][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 658.406858][ C1] ? __lock_acquire+0x16a0/0x5590 [ 658.406861][ C1] ___sys_sendmsg+0xf3/0x170 [ 658.406865][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 658.406869][ C1] ? find_held_lock+0x2d/0x110 [ 658.406872][ C1] ? __might_fault+0xd3/0x180 [ 658.406876][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 658.406879][ C1] __sys_sendmmsg+0x195/0x470 [ 658.406883][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 658.406887][ C1] ? sockfd_lookup_light+0xc6/0x180 [ 658.406890][ C1] ? __sys_sendmsg+0x10c/0x1b0 [ 658.406894][ C1] ? __sys_sendmsg_sock+0xb0/0xb0 [ 658.406897][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 658.406901][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 658.406904][ C1] do_syscall_64+0x2d/0x70 [ 658.406908][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 658.406912][ C1] RIP: 0033:0x442e99 [ 658.406922][ 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 [ 658.406926][ C1] RSP: 002b:00007ffe756c92a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 658.406935][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442e99 [ 658.406940][ C1] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 658.406945][ C1] RBP: 00007ffe756c92b0 R08: 0000000120080522 R09: 0000000120080522 [ 658.406950][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a41d0 [ 658.406955][ C1] R13: 0000000000403d70 R14: 0000000000000000 R15: 0000000000000000 [ 658.406961][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.181 msecs [ 658.408576][ T1659] Kernel panic - not syncing: hung_task: blocked tasks [ 658.963355][ T1659] CPU: 0 PID: 1659 Comm: khungtaskd Not tainted 5.9.0-syzkaller #0 [ 658.971239][ T1659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.981285][ T1659] Call Trace: [ 658.984579][ T1659] dump_stack+0x107/0x163 [ 658.988944][ T1659] panic+0x306/0x73d [ 658.992842][ T1659] ? __warn_printk+0xf3/0xf3 [ 658.997435][ T1659] ? lapic_can_unplug_cpu+0x80/0x80 [ 659.002629][ T1659] ? preempt_schedule_thunk+0x16/0x18 [ 659.008019][ T1659] ? watchdog.cold+0x5/0x158 [ 659.012605][ T1659] ? watchdog+0xa80/0xfa0 [ 659.016937][ T1659] watchdog.cold+0x16/0x158 [ 659.021440][ T1659] ? reset_hung_task_detector+0x30/0x30 [ 659.026986][ T1659] kthread+0x3af/0x4a0 [ 659.031052][ T1659] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 659.036943][ T1659] ret_from_fork+0x1f/0x30 [ 659.042145][ T1659] Kernel Offset: disabled [ 659.046478][ T1659] Rebooting in 86400 seconds..