[ 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 '10.128.0.193' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 479.368896][ T8486] IPVS: ftp: loaded support on port[0] = 21 [ 715.766784][ T1624] INFO: task kworker/u4:0:8 blocked for more than 143 seconds. [ 715.774599][ T1624] Not tainted 5.10.0-rc5-syzkaller #0 [ 715.781983][ T1624] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 715.791213][ T1624] task:kworker/u4:0 state:D stack:23600 pid: 8 ppid: 2 flags:0x00004000 [ 715.801824][ T1624] Workqueue: tc_filter_workqueue tcindex_partial_destroy_work [ 715.809852][ T1624] Call Trace: [ 715.813147][ T1624] __schedule+0x893/0x2130 [ 715.818661][ T1624] ? io_schedule_timeout+0x140/0x140 [ 715.823946][ T1624] schedule+0xcf/0x270 [ 715.828841][ T1624] schedule_preempt_disabled+0xf/0x20 [ 715.834205][ T1624] __mutex_lock+0x3e2/0x10e0 [ 715.839578][ T1624] ? tcindex_partial_destroy_work+0x13/0x50 [ 715.845468][ T1624] ? mutex_lock_io_nested+0xf60/0xf60 [ 715.851687][ T1624] ? lock_release+0x710/0x710 [ 715.856546][ T1624] tcindex_partial_destroy_work+0x13/0x50 [ 715.863052][ T1624] process_one_work+0x933/0x15a0 [ 715.868554][ T1624] ? lock_release+0x710/0x710 [ 715.873225][ T1624] ? pwq_dec_nr_in_flight+0x320/0x320 [ 715.879386][ T1624] ? rwlock_bug.part.0+0x90/0x90 [ 715.884321][ T1624] ? _raw_spin_lock_irq+0x41/0x50 [ 715.890172][ T1624] worker_thread+0x64c/0x1120 [ 715.895028][ T1624] ? process_one_work+0x15a0/0x15a0 [ 715.901172][ T1624] kthread+0x3b1/0x4a0 [ 715.905238][ T1624] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 715.912060][ T1624] ret_from_fork+0x1f/0x30 [ 715.916604][ T1624] INFO: task kworker/1:0:8478 blocked for more than 143 seconds. [ 715.925262][ T1624] Not tainted 5.10.0-rc5-syzkaller #0 [ 715.932498][ T1624] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 715.942049][ T1624] task:kworker/1:0 state:D stack:29856 pid: 8478 ppid: 2 flags:0x00004000 [ 715.951803][ T1624] Workqueue: ipv6_addrconf addrconf_verify_work [ 715.958567][ T1624] Call Trace: [ 715.961852][ T1624] __schedule+0x893/0x2130 [ 715.966474][ T1624] ? io_schedule_timeout+0x140/0x140 [ 715.973133][ T1624] ? _raw_spin_unlock_irq+0x1f/0x40 [ 715.978875][ T1624] ? lockdep_hardirqs_on+0x79/0x100 [ 715.984070][ T1624] schedule+0xcf/0x270 [ 715.988952][ T1624] schedule_preempt_disabled+0xf/0x20 [ 715.994318][ T1624] __mutex_lock+0x3e2/0x10e0 [ 715.999712][ T1624] ? addrconf_verify_work+0xa/0x20 [ 716.004822][ T1624] ? mutex_lock_io_nested+0xf60/0xf60 [ 716.011335][ T1624] ? lock_release+0x710/0x710 [ 716.016008][ T1624] ? lock_downgrade+0x6d0/0x6d0 [ 716.021650][ T1624] addrconf_verify_work+0xa/0x20 [ 716.026587][ T1624] process_one_work+0x933/0x15a0 [ 716.032751][ T1624] ? lock_release+0x710/0x710 [ 716.038015][ T1624] ? pwq_dec_nr_in_flight+0x320/0x320 [ 716.043385][ T1624] ? rwlock_bug.part.0+0x90/0x90 [ 716.049091][ T1624] ? _raw_spin_lock_irq+0x41/0x50 [ 716.054115][ T1624] worker_thread+0x64c/0x1120 [ 716.060382][ T1624] ? __kthread_parkme+0x13f/0x1e0 [ 716.065402][ T1624] ? process_one_work+0x15a0/0x15a0 [ 716.071372][ T1624] kthread+0x3b1/0x4a0 [ 716.075439][ T1624] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 716.082099][ T1624] ret_from_fork+0x1f/0x30 [ 716.086545][ T1624] [ 716.086545][ T1624] Showing all locks held in the system: [ 716.095311][ T1624] 3 locks held by kworker/u4:0/8: [ 716.100863][ T1624] #0: ffff888014e9f938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 [ 716.112900][ T1624] #1: ffffc90000cd7da8 ((work_completion)(&(rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 [ 716.124814][ T1624] #2: ffffffff8c927488 (rtnl_mutex){+.+.}-{3:3}, at: tcindex_partial_destroy_work+0x13/0x50 [ 716.135709][ T1624] 1 lock held by khungtaskd/1624: [ 716.141492][ T1624] #0: ffffffff8b3378e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 716.151930][ T1624] 1 lock held by in:imklog/8185: [ 716.157366][ T1624] #0: ffff88801293f270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 716.166512][ T1624] 3 locks held by kworker/1:0/8478: [ 716.172583][ T1624] #0: ffff88802092d538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 [ 716.184061][ T1624] #1: ffffc90000e0fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 [ 716.195685][ T1624] #2: ffffffff8c927488 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 716.205615][ T1624] 1 lock held by syz-executor734/8509: [ 716.211611][ T1624] [ 716.213928][ T1624] ============================================= [ 716.213928][ T1624] [ 716.223534][ T1624] NMI backtrace for cpu 0 [ 716.228009][ T1624] CPU: 0 PID: 1624 Comm: khungtaskd Not tainted 5.10.0-rc5-syzkaller #0 [ 716.236315][ T1624] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.246350][ T1624] Call Trace: [ 716.249629][ T1624] dump_stack+0x107/0x163 [ 716.253947][ T1624] nmi_cpu_backtrace.cold+0x44/0xd7 [ 716.259135][ T1624] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.264325][ T1624] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 716.270638][ T1624] watchdog+0xd43/0xfa0 [ 716.274785][ T1624] ? reset_hung_task_detector+0x30/0x30 [ 716.280317][ T1624] kthread+0x3b1/0x4a0 [ 716.284372][ T1624] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 716.290692][ T1624] ret_from_fork+0x1f/0x30 [ 716.295158][ T1624] Sending NMI from CPU 0 to CPUs 1: [ 716.300978][ C1] NMI backtrace for cpu 1 [ 716.300983][ C1] CPU: 1 PID: 8509 Comm: syz-executor734 Not tainted 5.10.0-rc5-syzkaller #0 [ 716.300988][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.300991][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 [ 716.301000][ C1] Code: 8b 48 89 54 24 08 48 89 34 24 e8 a2 aa 5e 02 48 8b 54 24 08 48 8b 34 24 e9 a1 fd ff ff 0f 1f 40 00 65 48 8b 14 25 00 f0 01 00 <65> 8b 05 20 eb 91 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 [ 716.301004][ C1] RSP: 0018:ffffc900015decc8 EFLAGS: 00000282 [ 716.301011][ C1] RAX: ffffed1002b4b908 RBX: dffffc0000000000 RCX: 0000000000000000 [ 716.301015][ C1] RDX: ffff888027740000 RSI: ffff888015a5c840 RDI: ffff88801b245e90 [ 716.301019][ C1] RBP: 00000000fffffbff R08: 0000000000000000 R09: ffff88801b245e07 [ 716.301023][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: ffffc900015def78 [ 716.301027][ C1] R13: 0000000000000001 R14: ffff88801b245e00 R15: ffff88801b245e90 [ 716.301032][ C1] FS: 0000000000752880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 716.301035][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 716.301039][ C1] CR2: 00007f205ece6000 CR3: 000000001c900000 CR4: 0000000000350ee0 [ 716.301042][ C1] Call Trace: [ 716.301044][ C1] __radix_tree_lookup+0x81/0x290 [ 716.301047][ C1] tcf_idr_check_alloc+0xb0/0x3b0 [ 716.301050][ C1] tcf_police_init+0x347/0x13a0 [ 716.301053][ C1] ? tcf_police_cleanup+0x60/0x60 [ 716.301056][ C1] ? find_held_lock+0x2d/0x110 [ 716.301058][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 716.301068][ C1] ? stack_trace_consume_entry+0x160/0x160 [ 716.301071][ C1] tcf_action_init_1+0x1a3/0x990 [ 716.301074][ C1] ? tcf_action_dump_old+0x80/0x80 [ 716.301076][ C1] ? ____sys_sendmsg+0x6e8/0x810 [ 716.301079][ C1] ? ___sys_sendmsg+0xf3/0x170 [ 716.301082][ C1] ? __sys_sendmsg+0xe5/0x1b0 [ 716.301085][ C1] ? do_syscall_64+0x2d/0x70 [ 716.301088][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 716.301091][ C1] ? find_held_lock+0x2d/0x110 [ 716.301093][ C1] tcf_exts_validate+0x138/0x420 [ 716.301096][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 716.301099][ C1] ? kasan_unpoison_shadow+0x33/0x40 [ 716.301102][ C1] tcindex_set_parms+0x189/0x20d0 [ 716.301105][ C1] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 716.301108][ C1] ? tcindex_alloc_perfect_hash+0x440/0x440 [ 716.301111][ C1] ? __nla_validate_parse+0x2d3/0x2ae0 [ 716.301115][ C1] ? nla_get_range_signed+0x520/0x520 [ 716.301117][ C1] ? find_held_lock+0x2d/0x110 [ 716.301120][ C1] tcindex_change+0x212/0x320 [ 716.301123][ C1] ? tcindex_set_parms+0x20d0/0x20d0 [ 716.301126][ C1] tc_new_tfilter+0x1398/0x2130 [ 716.301129][ C1] ? tcindex_set_parms+0x20d0/0x20d0 [ 716.301131][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 716.301134][ C1] ? kernel_text_address+0xbd/0xf0 [ 716.301137][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 716.301140][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 716.301143][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 716.301146][ C1] netlink_rcv_skb+0x153/0x420 [ 716.301149][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 716.301151][ C1] ? netlink_ack+0xaa0/0xaa0 [ 716.301154][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 716.301157][ C1] netlink_unicast+0x533/0x7d0 [ 716.301160][ C1] ? netlink_attachskb+0x810/0x810 [ 716.301163][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 716.301166][ C1] ? __check_object_size+0x171/0x3f0 [ 716.301169][ C1] netlink_sendmsg+0x856/0xd90 [ 716.301171][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 716.301174][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 716.301177][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 716.301180][ C1] sock_sendmsg+0xcf/0x120 [ 716.301182][ C1] ____sys_sendmsg+0x6e8/0x810 [ 716.301185][ C1] ? kernel_sendmsg+0x50/0x50 [ 716.301188][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 716.301191][ C1] ? rcu_read_lock_sched_held+0x3a/0x70 [ 716.301193][ C1] ? kfree+0x2d3/0x360 [ 716.301196][ C1] ___sys_sendmsg+0xf3/0x170 [ 716.301199][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 716.301202][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 716.301205][ C1] ? _copy_to_user+0xdc/0x150 [ 716.301207][ C1] ? move_addr_to_user+0xad/0x1e0 [ 716.301210][ C1] ? __fget_light+0x215/0x280 [ 716.301213][ C1] __sys_sendmsg+0xe5/0x1b0 [ 716.301215][ C1] ? __sys_sendmsg_sock+0xb0/0xb0 [ 716.301219][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 716.301221][ C1] do_syscall_64+0x2d/0x70 [ 716.301225][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 716.301227][ C1] RIP: 0033:0x441719 [ 716.301236][ 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 [ 716.301239][ C1] RSP: 002b:00007fffc701d5b8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 716.301246][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441719 [ 716.301250][ C1] RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 [ 716.301254][ C1] RBP: 00007fffc701d5c0 R08: 0000000100000000 R09: 0000000100000000 [ 716.301258][ C1] R10: 0000000100000000 R11: 0000000000000246 R12: 00000000000750a8 [ 716.301263][ C1] R13: 00000000004025f0 R14: 0000000000000000 R15: 0000000000000000 [ 716.301744][ T1624] Kernel panic - not syncing: hung_task: blocked tasks [ 716.812207][ T1624] CPU: 0 PID: 1624 Comm: khungtaskd Not tainted 5.10.0-rc5-syzkaller #0 [ 716.820511][ T1624] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.830547][ T1624] Call Trace: [ 716.833831][ T1624] dump_stack+0x107/0x163 [ 716.838155][ T1624] panic+0x306/0x73d [ 716.842041][ T1624] ? __warn_printk+0xf3/0xf3 [ 716.846621][ T1624] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.851805][ T1624] ? preempt_schedule_thunk+0x16/0x18 [ 716.857166][ T1624] ? watchdog.cold+0x5/0x158 [ 716.861741][ T1624] ? watchdog+0xa80/0xfa0 [ 716.866059][ T1624] watchdog.cold+0x16/0x158 [ 716.870551][ T1624] ? reset_hung_task_detector+0x30/0x30 [ 716.876087][ T1624] kthread+0x3b1/0x4a0 [ 716.880148][ T1624] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 716.886027][ T1624] ret_from_fork+0x1f/0x30 [ 716.894437][ T1624] Kernel Offset: disabled [ 716.899125][ T1624] Rebooting in 86400 seconds..