[ OK ] Started Getty on tty3. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.147' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 492.026049][ T8468] IPVS: ftp: loaded support on port[0] = 21 [ 492.071298][ T8490] netlink: 1028 bytes leftover after parsing attributes in process `syz-executor638'. [ 492.084192][ T8490] netlink: 1028 bytes leftover after parsing attributes in process `syz-executor638'. [ 716.378596][ T1646] INFO: task kworker/0:3:3205 blocked for more than 143 seconds. [ 716.388181][ T1646] Not tainted 5.11.0-rc2-syzkaller #0 [ 716.397855][ T1646] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.407483][ T1646] task:kworker/0:3 state:D stack:26592 pid: 3205 ppid: 2 flags:0x00004000 [ 716.417980][ T1646] Workqueue: ipv6_addrconf addrconf_verify_work [ 716.425317][ T1646] Call Trace: [ 716.429412][ T1646] __schedule+0x90c/0x21a0 [ 716.434014][ T1646] ? io_schedule_timeout+0x140/0x140 [ 716.440819][ T1646] ? _raw_spin_unlock_irq+0x1f/0x40 [ 716.446401][ T1646] ? lockdep_hardirqs_on+0x79/0x100 [ 716.453253][ T1646] schedule+0xcf/0x270 [ 716.457603][ T1646] schedule_preempt_disabled+0xf/0x20 [ 716.464289][ T1646] __mutex_lock+0x81a/0x1110 [ 716.469699][ T1646] ? addrconf_verify_work+0xa/0x20 [ 716.474935][ T1646] ? mutex_lock_io_nested+0xf60/0xf60 [ 716.481538][ T1646] ? lock_release+0x710/0x710 [ 716.486341][ T1646] ? lock_downgrade+0x6d0/0x6d0 [ 716.493384][ T1646] addrconf_verify_work+0xa/0x20 [ 716.498352][ T1646] process_one_work+0x98d/0x15f0 [ 716.504644][ T1646] ? pwq_dec_nr_in_flight+0x320/0x320 [ 716.511121][ T1646] ? rwlock_bug.part.0+0x90/0x90 [ 716.516113][ T1646] ? _raw_spin_lock_irq+0x41/0x50 [ 716.523876][ T1646] worker_thread+0x64c/0x1120 [ 716.530024][ T1646] ? __kthread_parkme+0x13f/0x1e0 [ 716.535148][ T1646] ? process_one_work+0x15f0/0x15f0 [ 716.542396][ T1646] kthread+0x3b1/0x4a0 [ 716.546576][ T1646] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 716.553754][ T1646] ret_from_fork+0x1f/0x30 [ 716.558509][ T1646] [ 716.558509][ T1646] Showing all locks held in the system: [ 716.566461][ T1646] 1 lock held by khungtaskd/1646: [ 716.572307][ T1646] #0: ffffffff8b363860 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 716.583006][ T1646] 3 locks held by kworker/0:3/3205: [ 716.588221][ T1646] #0: ffff888020e3dd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 716.599736][ T1646] #1: ffffc9000256fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 716.610370][ T1646] #2: ffffffff8c9465a8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 716.620378][ T1646] 1 lock held by in:imklog/8169: [ 716.625683][ T1646] #0: ffff8880115c5270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 716.635038][ T1646] 2 locks held by syz-executor638/8490: [ 716.640915][ T1646] [ 716.643279][ T1646] ============================================= [ 716.643279][ T1646] [ 716.653284][ T1646] NMI backtrace for cpu 1 [ 716.657631][ T1646] CPU: 1 PID: 1646 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 716.666058][ T1646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.676332][ T1646] Call Trace: [ 716.679630][ T1646] dump_stack+0x107/0x163 [ 716.684031][ T1646] nmi_cpu_backtrace.cold+0x44/0xd7 [ 716.689268][ T1646] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.694558][ T1646] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 716.700590][ T1646] watchdog+0xd43/0xfa0 [ 716.704817][ T1646] ? reset_hung_task_detector+0x30/0x30 [ 716.710725][ T1646] kthread+0x3b1/0x4a0 [ 716.714802][ T1646] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 716.720709][ T1646] ret_from_fork+0x1f/0x30 [ 716.725353][ T1646] Sending NMI from CPU 1 to CPUs 0: [ 716.732070][ C0] NMI backtrace for cpu 0 [ 716.732081][ C0] CPU: 0 PID: 8490 Comm: syz-executor638 Not tainted 5.11.0-rc2-syzkaller #0 [ 716.732091][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.732100][ C0] RIP: 0010:__kasan_check_read+0x4/0x10 [ 716.732111][ C0] Code: fe 06 48 85 db 0f 85 0b 90 ff 06 48 83 c4 60 5b 5d 41 5c 41 5d c3 c3 e9 0b 91 ff 06 cc cc cc cc cc cc cc cc cc cc 48 8b 0c 24 <89> f6 31 d2 e9 23 f9 ff ff 0f 1f 00 48 8b 0c 24 89 f6 ba 01 00 00 [ 716.732128][ C0] RSP: 0018:ffffc900015dea50 EFLAGS: 00000007 [ 716.732140][ C0] RAX: 0000000000000018 RBX: 0000000000000001 RCX: ffffffff815829cb [ 716.732148][ C0] RDX: 1ffff110029ed4b2 RSI: 0000000000000008 RDI: ffffffff8ebda860 [ 716.732157][ C0] RBP: ffff888014f69bc0 R08: 0000000000000000 R09: ffffffff8ebda867 [ 716.732166][ C0] R10: fffffbfff1d7b50c R11: 0000000000000000 R12: ffff888014f6a570 [ 716.732174][ C0] R13: 0000000000000003 R14: ffff88801414a068 R15: 000000000000063e [ 716.732183][ C0] FS: 0000000000eea880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 716.732192][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 716.732199][ C0] CR2: 00007f9705e4a000 CR3: 000000001c8b1000 CR4: 00000000001506f0 [ 716.732208][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 716.732217][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 716.732224][ C0] Call Trace: [ 716.732228][ C0] __lock_acquire+0x47b/0x5500 [ 716.732233][ C0] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 716.732240][ C0] ? mark_lock+0xf7/0x1730 [ 716.732245][ C0] lock_acquire+0x29d/0x740 [ 716.732250][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 716.732255][ C0] ? lock_release+0x710/0x710 [ 716.732261][ C0] ? __schedule+0x914/0x21a0 [ 716.732266][ C0] __mutex_lock+0x134/0x1110 [ 716.732271][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 716.732277][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 716.732283][ C0] ? mutex_lock_io_nested+0xf60/0xf60 [ 716.732289][ C0] ? __mutex_unlock_slowpath+0xe2/0x610 [ 716.732295][ C0] ? wait_for_completion_io+0x260/0x260 [ 716.732301][ C0] tcf_idr_check_alloc+0x78/0x3b0 [ 716.732306][ C0] tcf_police_init+0x347/0x13a0 [ 716.732312][ C0] ? tcf_police_cleanup+0x60/0x60 [ 716.732317][ C0] ? find_held_lock+0x2d/0x110 [ 716.732322][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 716.732328][ C0] ? stack_trace_save+0x8c/0xc0 [ 716.732334][ C0] tcf_action_init_1+0x1a3/0x990 [ 716.732339][ C0] ? tcf_action_dump_old+0x80/0x80 [ 716.732345][ C0] ? ____sys_sendmsg+0x331/0x810 [ 716.732350][ C0] ? ___sys_sendmsg+0xf3/0x170 [ 716.732355][ C0] ? __sys_sendmmsg+0x195/0x470 [ 716.732361][ C0] ? __x64_sys_sendmmsg+0x99/0x100 [ 716.732366][ C0] ? do_syscall_64+0x2d/0x70 [ 716.732372][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 716.732383][ C0] ? find_held_lock+0x2d/0x110 [ 716.732388][ C0] tcf_exts_validate+0x138/0x420 [ 716.732394][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 716.732399][ C0] ? unpoison_range+0x3a/0x60 [ 716.732404][ C0] route4_change+0x6d8/0x2380 [ 716.732409][ C0] ? tc_new_tfilter+0x1b51/0x2120 [ 716.732415][ C0] ? route4_delete+0xb70/0xb70 [ 716.732421][ C0] ? tc_new_tfilter+0x132a/0x2120 [ 716.732426][ C0] tc_new_tfilter+0x1394/0x2120 [ 716.732431][ C0] ? route4_delete+0xb70/0xb70 [ 716.732437][ C0] ? tc_del_tfilter+0x15b0/0x15b0 [ 716.732442][ C0] ? tc_del_tfilter+0x15b0/0x15b0 [ 716.732448][ C0] rtnetlink_rcv_msg+0x80e/0xad0 [ 716.732453][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 716.732459][ C0] netlink_rcv_skb+0x153/0x420 [ 716.732464][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 716.732470][ C0] ? netlink_ack+0xaa0/0xaa0 [ 716.732475][ C0] ? netlink_deliver_tap+0x227/0xb70 [ 716.732481][ C0] netlink_unicast+0x533/0x7d0 [ 716.732486][ C0] ? netlink_attachskb+0x870/0x870 [ 716.732492][ C0] ? _copy_from_iter_full+0x275/0x850 [ 716.732498][ C0] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 716.732505][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 716.732510][ C0] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 716.732516][ C0] ? __check_object_size+0x171/0x3f0 [ 716.732522][ C0] netlink_sendmsg+0x856/0xd90 [ 716.732527][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 716.732533][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 716.732540][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 716.732545][ C0] sock_sendmsg+0xcf/0x120 [ 716.732550][ C0] ____sys_sendmsg+0x331/0x810 [ 716.732555][ C0] ? kernel_sendmsg+0x50/0x50 [ 716.732560][ C0] ? do_recvmmsg+0x6c0/0x6c0 [ 716.732566][ C0] ? __lock_acquire+0x16b7/0x5500 [ 716.732571][ C0] ___sys_sendmsg+0xf3/0x170 [ 716.732576][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 716.732582][ C0] ? find_held_lock+0x2d/0x110 [ 716.732587][ C0] ? __might_fault+0xd3/0x180 [ 716.732592][ C0] ? lock_downgrade+0x6d0/0x6d0 [ 716.732598][ C0] __sys_sendmmsg+0x195/0x470 [ 716.732603][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 716.732609][ C0] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 716.732615][ C0] ? sockfd_lookup_light+0xc5/0x180 [ 716.732620][ C0] ? __sys_sendmsg+0x10c/0x1b0 [ 716.732624][ C0] ? __sys_sendmsg_sock+0xb0/0xb0 [ 716.732629][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 716.732635][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 716.732640][ C0] ? syscall_enter_from_user_mode+0x1d/0x50 [ 716.732645][ C0] do_syscall_64+0x2d/0x70 [ 716.732650][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 716.732655][ C0] RIP: 0033:0x441609 [ 716.732663][ C0] 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 [ 716.732677][ C0] RSP: 002b:00007fff1cd4e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 716.732689][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441609 [ 716.732696][ C0] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 716.732703][ C0] RBP: 00007fff1cd4e0d0 R08: 0000000120080522 R09: 0000000120080522 [ 716.732711][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2990 [ 716.732718][ C0] R13: 00000000004024e0 R14: 0000000000000000 R15: 0000000000000000 [ 716.732727][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.421 msecs [ 716.733024][ T1646] Kernel panic - not syncing: hung_task: blocked tasks [ 717.350866][ T1646] CPU: 1 PID: 1646 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 717.359206][ T1646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.369356][ T1646] Call Trace: [ 717.372641][ T1646] dump_stack+0x107/0x163 [ 717.376993][ T1646] panic+0x306/0x73d [ 717.380943][ T1646] ? __warn_printk+0xf3/0xf3 [ 717.385547][ T1646] ? lapic_can_unplug_cpu+0x80/0x80 [ 717.390765][ T1646] ? preempt_schedule_thunk+0x16/0x18 [ 717.396149][ T1646] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 717.402318][ T1646] ? watchdog.cold+0x5/0x158 [ 717.406961][ T1646] watchdog.cold+0x16/0x158 [ 717.411487][ T1646] ? reset_hung_task_detector+0x30/0x30 [ 717.417073][ T1646] kthread+0x3b1/0x4a0 [ 717.421167][ T1646] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 717.427074][ T1646] ret_from_fork+0x1f/0x30 [ 717.432230][ T1646] Kernel Offset: disabled [ 717.436691][ T1646] Rebooting in 86400 seconds..