[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.3' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 487.629177][ T8509] IPVS: ftp: loaded support on port[0] = 21 executing program [ 487.675968][ T8531] netlink: 72 bytes leftover after parsing attributes in process `syz-executor047'. [ 487.686622][ T8531] netlink: 24 bytes leftover after parsing attributes in process `syz-executor047'. [ 487.699646][ T8531] netlink: 72 bytes leftover after parsing attributes in process `syz-executor047'. [ 487.710287][ T8533] netlink: 24 bytes leftover after parsing attributes in process `syz-executor047'. executing program [ 487.737267][ T8541] netlink: 72 bytes leftover after parsing attributes in process `syz-executor047'. [ 487.747719][ T8541] netlink: 24 bytes leftover after parsing attributes in process `syz-executor047'. [ 487.761458][ T8541] netlink: 72 bytes leftover after parsing attributes in process `syz-executor047'. [ 487.772507][ T8543] netlink: 24 bytes leftover after parsing attributes in process `syz-executor047'. executing program executing program [ 487.790881][ T8546] netlink: 72 bytes leftover after parsing attributes in process `syz-executor047'. [ 487.801209][ T8546] netlink: 24 bytes leftover after parsing attributes in process `syz-executor047'. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 721.404126][ T1655] INFO: task kworker/0:2:3004 blocked for more than 143 seconds. [ 721.412007][ T1655] Not tainted 5.10.0-rc6-syzkaller #0 [ 721.421113][ T1655] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.430645][ T1655] task:kworker/0:2 state:D stack:28448 pid: 3004 ppid: 2 flags:0x00004000 [ 721.440802][ T1655] Workqueue: events linkwatch_event [ 721.446872][ T1655] Call Trace: [ 721.450200][ T1655] __schedule+0x893/0x2130 [ 721.457003][ T1655] ? io_schedule_timeout+0x140/0x140 [ 721.462309][ T1655] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.469376][ T1655] ? lockdep_hardirqs_on+0x79/0x100 [ 721.475281][ T1655] schedule+0xcf/0x270 [ 721.479379][ T1655] schedule_preempt_disabled+0xf/0x20 [ 721.486054][ T1655] __mutex_lock+0x3e2/0x10e0 [ 721.490689][ T1655] ? linkwatch_event+0xb/0x60 [ 721.496581][ T1655] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.501993][ T1655] ? lock_release+0x710/0x710 [ 721.507991][ T1655] linkwatch_event+0xb/0x60 [ 721.512520][ T1655] process_one_work+0x933/0x15a0 [ 721.518808][ T1655] ? lock_release+0x710/0x710 [ 721.523527][ T1655] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.530269][ T1655] ? rwlock_bug.part.0+0x90/0x90 [ 721.536018][ T1655] ? _raw_spin_lock_irq+0x41/0x50 [ 721.541088][ T1655] worker_thread+0x64c/0x1120 [ 721.547149][ T1655] ? __kthread_parkme+0x13f/0x1e0 [ 721.552219][ T1655] ? process_one_work+0x15a0/0x15a0 [ 721.558921][ T1655] kthread+0x3b1/0x4a0 [ 721.563037][ T1655] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.570389][ T1655] ret_from_fork+0x1f/0x30 [ 721.575794][ T1655] INFO: task kworker/0:0:8837 blocked for more than 143 seconds. [ 721.585761][ T1655] Not tainted 5.10.0-rc6-syzkaller #0 [ 721.591688][ T1655] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.602247][ T1655] task:kworker/0:0 state:D stack:29768 pid: 8837 ppid: 2 flags:0x00004000 [ 721.612282][ T1655] Workqueue: ipv6_addrconf addrconf_verify_work [ 721.619297][ T1655] Call Trace: [ 721.622632][ T1655] __schedule+0x893/0x2130 [ 721.628358][ T1655] ? io_schedule_timeout+0x140/0x140 [ 721.634370][ T1655] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.639591][ T1655] ? lockdep_hardirqs_on+0x79/0x100 [ 721.646132][ T1655] schedule+0xcf/0x270 [ 721.650235][ T1655] schedule_preempt_disabled+0xf/0x20 [ 721.656814][ T1655] __mutex_lock+0x3e2/0x10e0 [ 721.661432][ T1655] ? addrconf_verify_work+0xa/0x20 [ 721.667713][ T1655] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.673399][ T1655] ? lock_release+0x710/0x710 [ 721.679784][ T1655] ? lock_downgrade+0x6d0/0x6d0 [ 721.685559][ T1655] addrconf_verify_work+0xa/0x20 [ 721.690617][ T1655] process_one_work+0x933/0x15a0 [ 721.696760][ T1655] ? lock_release+0x710/0x710 [ 721.701466][ T1655] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.708108][ T1655] ? rwlock_bug.part.0+0x90/0x90 [ 721.713077][ T1655] ? _raw_spin_lock_irq+0x41/0x50 [ 721.720709][ T1655] worker_thread+0x64c/0x1120 [ 721.726330][ T1655] ? __kthread_parkme+0x13f/0x1e0 [ 721.731387][ T1655] ? process_one_work+0x15a0/0x15a0 [ 721.737809][ T1655] kthread+0x3b1/0x4a0 [ 721.741902][ T1655] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.749020][ T1655] ret_from_fork+0x1f/0x30 [ 721.753500][ T1655] [ 721.753500][ T1655] Showing all locks held in the system: [ 721.762580][ T1655] 1 lock held by khungtaskd/1655: [ 721.768355][ T1655] #0: ffffffff8b337a20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.779028][ T1655] 3 locks held by kworker/0:2/3004: [ 721.785071][ T1655] #0: ffff888010064d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 [ 721.796335][ T1655] #1: ffffc90001dafda8 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 [ 721.807723][ T1655] #2: ffffffff8c92d448 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xb/0x60 [ 721.817701][ T1655] 1 lock held by in:imklog/8186: [ 721.822737][ T1655] #0: ffff888017c900f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.833208][ T1655] 2 locks held by syz-executor047/8830: [ 721.839526][ T1655] 3 locks held by kworker/0:0/8837: [ 721.846995][ T1655] #0: ffff888147499138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 [ 721.859001][ T1655] #1: ffffc90001aefda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 [ 721.873291][ T1655] #2: ffffffff8c92d448 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 721.883662][ T1655] [ 721.886006][ T1655] ============================================= [ 721.886006][ T1655] [ 721.896247][ T1655] NMI backtrace for cpu 1 [ 721.900593][ T1655] CPU: 1 PID: 1655 Comm: khungtaskd Not tainted 5.10.0-rc6-syzkaller #0 [ 721.908917][ T1655] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.918997][ T1655] Call Trace: [ 721.922302][ T1655] dump_stack+0x107/0x163 [ 721.926644][ T1655] nmi_cpu_backtrace.cold+0x44/0xd7 [ 721.931866][ T1655] ? lapic_can_unplug_cpu+0x80/0x80 [ 721.937137][ T1655] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 721.943142][ T1655] watchdog+0xd43/0xfa0 [ 721.947312][ T1655] ? reset_hung_task_detector+0x30/0x30 [ 721.952872][ T1655] kthread+0x3b1/0x4a0 [ 721.956950][ T1655] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.962853][ T1655] ret_from_fork+0x1f/0x30 [ 721.967575][ T1655] Sending NMI from CPU 1 to CPUs 0: [ 721.973761][ C0] NMI backtrace for cpu 0 [ 721.973769][ C0] CPU: 0 PID: 8830 Comm: syz-executor047 Not tainted 5.10.0-rc6-syzkaller #0 [ 721.973776][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.973782][ C0] RIP: 0010:__this_cpu_preempt_check+0x0/0x20 [ 721.973795][ C0] Code: 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 c7 c6 00 ae 9d 89 48 c7 c7 40 ae 9d 89 e9 b8 fe ff ff 0f 1f 84 00 00 00 00 00 <55> 48 89 fd 0f 1f 44 00 00 48 89 ee 5d 48 c7 c7 80 ae 9d 89 e9 97 [ 721.973801][ C0] RSP: 0018:ffffc90001a2eb50 EFLAGS: 00000082 [ 721.973813][ C0] RAX: 0000000000000001 RBX: 1ffff92000345d6d RCX: 0000000000000001 [ 721.973819][ C0] RDX: 1ffff11002f507b2 RSI: 0000000000000008 RDI: ffffffff894b60c0 [ 721.973826][ C0] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8ebb6727 [ 721.973832][ C0] R10: fffffbfff1d76ce4 R11: 0000000000000000 R12: 0000000000000000 [ 721.973839][ C0] R13: ffff88801433fa68 R14: 0000000000000000 R15: 0000000000000000 [ 721.973846][ C0] FS: 00007fc7c7ab9700(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 721.973851][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 721.973858][ C0] CR2: 00007fc7c7a97e78 CR3: 000000001292b000 CR4: 00000000001506f0 [ 721.973864][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 721.973870][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 721.973874][ C0] Call Trace: [ 721.973879][ C0] lock_acquire+0x2ad/0x740 [ 721.973883][ C0] ? lock_release+0x710/0x710 [ 721.973889][ C0] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 721.973893][ C0] __mutex_lock+0x134/0x10e0 [ 721.973898][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.973903][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.973908][ C0] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.973913][ C0] ? __mutex_unlock_slowpath+0xe2/0x610 [ 721.973918][ C0] ? wait_for_completion+0x260/0x260 [ 721.973923][ C0] tcf_idr_check_alloc+0x78/0x3b0 [ 721.973927][ C0] tcf_police_init+0x347/0x13a0 [ 721.973932][ C0] ? tcf_police_cleanup+0x60/0x60 [ 721.973937][ C0] ? find_held_lock+0x2d/0x110 [ 721.973941][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 721.973946][ C0] ? fs_reclaim_release+0x90/0xd0 [ 721.973951][ C0] tcf_action_init_1+0x1a3/0x990 [ 721.973956][ C0] ? tcf_action_dump_old+0x80/0x80 [ 721.973961][ C0] ? radix_tree_node_alloc.constprop.0+0x1b8/0x350 [ 721.973965][ C0] ? memset+0x20/0x40 [ 721.973970][ C0] ? delete_node+0x216/0x8c0 [ 721.973974][ C0] ? node_tag_clear+0xea/0x1f0 [ 721.973979][ C0] tcf_exts_validate+0x138/0x420 [ 721.973983][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 721.973988][ C0] ? kasan_unpoison_shadow+0x33/0x40 [ 721.973993][ C0] cls_bpf_change+0x60b/0x1b80 [ 721.973998][ C0] ? cls_bpf_bind_class+0x2c0/0x2c0 [ 721.974002][ C0] ? lock_downgrade+0x6d0/0x6d0 [ 721.974006][ C0] ? blackhole_dequeue+0x10/0x10 [ 721.974010][ C0] tc_new_tfilter+0x1394/0x2120 [ 721.974014][ C0] ? cls_bpf_bind_class+0x2c0/0x2c0 [ 721.974018][ C0] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.974021][ C0] ? kernel_text_address+0xbd/0xf0 [ 721.974025][ C0] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.974029][ C0] rtnetlink_rcv_msg+0x80e/0xad0 [ 721.974033][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 721.974037][ C0] netlink_rcv_skb+0x153/0x420 [ 721.974042][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 721.974046][ C0] ? netlink_ack+0xaa0/0xaa0 [ 721.974050][ C0] ? netlink_deliver_tap+0x227/0xb70 [ 721.974055][ C0] netlink_unicast+0x533/0x7d0 [ 721.974059][ C0] ? netlink_attachskb+0x810/0x810 [ 721.974063][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 721.974068][ C0] ? __check_object_size+0x171/0x3f0 [ 721.974072][ C0] netlink_sendmsg+0x856/0xd90 [ 721.974075][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 721.974078][ C0] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 721.974080][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 721.974083][ C0] sock_sendmsg+0xcf/0x120 [ 721.974085][ C0] ____sys_sendmsg+0x331/0x810 [ 721.974088][ C0] ? kernel_sendmsg+0x50/0x50 [ 721.974090][ C0] ? do_recvmmsg+0x6c0/0x6c0 [ 721.974093][ C0] ? __lock_acquire+0x16b7/0x5500 [ 721.974095][ C0] ___sys_sendmsg+0xf3/0x170 [ 721.974098][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 721.974101][ C0] ? find_held_lock+0x2d/0x110 [ 721.974103][ C0] ? __might_fault+0xd3/0x180 [ 721.974106][ C0] ? lock_downgrade+0x6d0/0x6d0 [ 721.974108][ C0] __sys_sendmmsg+0x195/0x470 [ 721.974111][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 721.974113][ C0] ? fput_many+0x2f/0x1a0 [ 721.974116][ C0] ? __do_sys_futex+0x2a2/0x470 [ 721.974118][ C0] ? __do_sys_futex+0x2ab/0x470 [ 721.974121][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 721.974124][ C0] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.974126][ C0] do_syscall_64+0x2d/0x70 [ 721.974129][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.974131][ C0] RIP: 0033:0x447219 [ 721.974139][ C0] Code: e8 bc b4 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 2b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 721.974142][ C0] RSP: 002b:00007fc7c7ab8d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 721.974155][ C0] RAX: ffffffffffffffda RBX: 00000000006dcc88 RCX: 0000000000447219 [ 721.974159][ C0] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000004 [ 721.974163][ C0] RBP: 00000000006dcc80 R08: 0000000000000000 R09: 0000000000000000 [ 721.974166][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dcc8c [ 721.974170][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: 0507002400000074 [ 721.993614][ T1655] Kernel panic - not syncing: hung_task: blocked tasks [ 722.520870][ T1655] CPU: 1 PID: 1655 Comm: khungtaskd Not tainted 5.10.0-rc6-syzkaller #0 [ 722.529198][ T1655] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 722.539276][ T1655] Call Trace: [ 722.542580][ T1655] dump_stack+0x107/0x163 [ 722.546927][ T1655] panic+0x306/0x73d [ 722.550849][ T1655] ? __warn_printk+0xf3/0xf3 [ 722.555463][ T1655] ? lapic_can_unplug_cpu+0x80/0x80 [ 722.560665][ T1655] ? preempt_schedule_thunk+0x16/0x18 [ 722.566055][ T1655] ? watchdog.cold+0x5/0x158 [ 722.570662][ T1655] ? watchdog+0xa80/0xfa0 [ 722.575033][ T1655] watchdog.cold+0x16/0x158 [ 722.579574][ T1655] ? reset_hung_task_detector+0x30/0x30 [ 722.585158][ T1655] kthread+0x3b1/0x4a0 [ 722.589241][ T1655] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 722.595242][ T1655] ret_from_fork+0x1f/0x30 [ 722.600374][ T1655] Kernel Offset: disabled [ 722.604701][ T1655] Rebooting in 86400 seconds..