[ 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 '10.128.0.251' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 633.306556][ T8452] IPVS: ftp: loaded support on port[0] = 21 [ 903.770745][ T1655] INFO: task kworker/0:1:8444 blocked for more than 143 seconds. [ 903.778726][ T1655] Not tainted 5.10.0-rc4-syzkaller #0 [ 903.788231][ T1655] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 903.797627][ T1655] task:kworker/0:1 state:D stack:29768 pid: 8444 ppid: 2 flags:0x00004000 [ 903.807740][ T1655] Workqueue: ipv6_addrconf addrconf_verify_work [ 903.814671][ T1655] Call Trace: [ 903.818047][ T1655] __schedule+0x893/0x2130 [ 903.823494][ T1655] ? io_schedule_timeout+0x140/0x140 [ 903.828801][ T1655] ? _raw_spin_unlock_irq+0x1f/0x40 [ 903.835109][ T1655] ? lockdep_hardirqs_on+0x79/0x100 [ 903.840333][ T1655] schedule+0xcf/0x270 [ 903.845410][ T1655] schedule_preempt_disabled+0xf/0x20 [ 903.851477][ T1655] __mutex_lock+0x3e2/0x10e0 [ 903.856084][ T1655] ? addrconf_verify_work+0xa/0x20 [ 903.862261][ T1655] ? mutex_lock_io_nested+0xf60/0xf60 [ 903.867711][ T1655] ? lock_release+0x710/0x710 [ 903.873496][ T1655] ? lock_downgrade+0x6d0/0x6d0 [ 903.878378][ T1655] addrconf_verify_work+0xa/0x20 [ 903.884380][ T1655] process_one_work+0x933/0x15a0 [ 903.889338][ T1655] ? lock_release+0x710/0x710 [ 903.895073][ T1655] ? pwq_dec_nr_in_flight+0x320/0x320 [ 903.901112][ T1655] ? rwlock_bug.part.0+0x90/0x90 [ 903.906079][ T1655] ? _raw_spin_lock_irq+0x41/0x50 [ 903.913407][ T1655] worker_thread+0x64c/0x1120 [ 903.918115][ T1655] ? __kthread_parkme+0x13f/0x1e0 [ 903.924136][ T1655] ? process_one_work+0x15a0/0x15a0 [ 903.929370][ T1655] kthread+0x3af/0x4a0 [ 903.934535][ T1655] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 903.941206][ T1655] ret_from_fork+0x1f/0x30 [ 903.945743][ T1655] [ 903.945743][ T1655] Showing all locks held in the system: [ 903.954601][ T1655] 1 lock held by khungtaskd/1655: [ 903.959641][ T1655] #0: ffffffff8b337820 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 903.971937][ T1655] 1 lock held by in:imklog/8146: [ 903.976892][ T1655] #0: ffff88801ef9aaf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 903.987215][ T1655] 3 locks held by kworker/0:1/8444: [ 903.993218][ T1655] #0: ffff888147a41538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 [ 904.004934][ T1655] #1: ffffc90000e9fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 [ 904.016824][ T1655] #2: ffffffff8c928588 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 904.026905][ T1655] 2 locks held by syz-executor297/8473: [ 904.033075][ T1655] [ 904.035665][ T1655] ============================================= [ 904.035665][ T1655] [ 904.046484][ T1655] NMI backtrace for cpu 0 [ 904.050946][ T1655] CPU: 0 PID: 1655 Comm: khungtaskd Not tainted 5.10.0-rc4-syzkaller #0 [ 904.059262][ T1655] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 904.069327][ T1655] Call Trace: [ 904.072682][ T1655] dump_stack+0x107/0x163 [ 904.077023][ T1655] nmi_cpu_backtrace.cold+0x44/0xd7 [ 904.082311][ T1655] ? lapic_can_unplug_cpu+0x80/0x80 [ 904.087563][ T1655] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 904.093587][ T1655] watchdog+0xd43/0xfa0 [ 904.097748][ T1655] ? reset_hung_task_detector+0x30/0x30 [ 904.103311][ T1655] kthread+0x3af/0x4a0 [ 904.107389][ T1655] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 904.113302][ T1655] ret_from_fork+0x1f/0x30 [ 904.117912][ T1655] Sending NMI from CPU 0 to CPUs 1: [ 904.124616][ C1] NMI backtrace for cpu 1 [ 904.124623][ C1] CPU: 1 PID: 8473 Comm: syz-executor297 Not tainted 5.10.0-rc4-syzkaller #0 [ 904.124630][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 904.124634][ C1] RIP: 0010:lock_is_held_type+0xc2/0x100 [ 904.124646][ C1] Code: 03 44 39 f0 41 0f 94 c4 48 c7 c7 c0 5e 4b 89 e8 d4 0b 00 00 b8 ff ff ff ff 65 0f c1 05 57 67 1c 77 83 f8 01 75 23 ff 34 24 9d <48> 83 c4 08 44 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 45 31 e4 eb [ 904.124651][ C1] RSP: 0018:ffffc900016beb50 EFLAGS: 00000202 [ 904.124660][ C1] RAX: 0000000000000001 RBX: 0000000000000001 RCX: 1ffffffff19d9d4b [ 904.124666][ C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 [ 904.124671][ C1] RBP: ffffffff8b337760 R08: ffffffff87119fb8 R09: ffff888021809207 [ 904.124677][ C1] R10: ffffed1004301240 R11: 0000000000000000 R12: 0000000000000000 [ 904.124682][ C1] R13: ffff88801487a350 R14: 00000000ffffffff R15: ffff88801487a350 [ 904.124688][ C1] FS: 0000000000000000(0000) GS:ffff8880b9f00000(0063) knlGS:000000000989d840 [ 904.124693][ C1] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 904.124699][ C1] CR2: 00007f691c03f0f8 CR3: 00000000112cc000 CR4: 00000000001506e0 [ 904.124704][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 904.124709][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 904.124712][ C1] Call Trace: [ 904.124716][ C1] ___might_sleep+0x236/0x2b0 [ 904.124720][ C1] __mutex_lock+0xa9/0x10e0 [ 904.124723][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 904.124727][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 904.124732][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 904.124736][ C1] ? wait_for_completion+0x260/0x260 [ 904.124739][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 904.124743][ C1] tcf_police_init+0x347/0x13a0 [ 904.124747][ C1] ? tcf_police_cleanup+0x60/0x60 [ 904.124751][ C1] ? find_held_lock+0x2d/0x110 [ 904.124755][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 904.124759][ C1] ? stack_trace_consume_entry+0x160/0x160 [ 904.124763][ C1] tcf_action_init_1+0x1a3/0x990 [ 904.124767][ C1] ? tcf_action_dump_old+0x80/0x80 [ 904.124771][ C1] ? ___sys_sendmsg+0xf3/0x170 [ 904.124775][ C1] ? __sys_sendmmsg+0x292/0x470 [ 904.124779][ C1] ? __ia32_compat_sys_sendmmsg+0x9b/0x100 [ 904.124783][ C1] ? __do_fast_syscall_32+0x56/0x80 [ 904.124787][ C1] ? do_fast_syscall_32+0x2f/0x70 [ 904.124792][ C1] ? entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 904.124795][ C1] ? find_held_lock+0x2d/0x110 [ 904.124799][ C1] tcf_exts_validate+0x138/0x420 [ 904.124803][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 904.124807][ C1] ? kasan_unpoison_shadow+0x33/0x40 [ 904.124811][ C1] rsvp_change+0x291/0x27a0 [ 904.124814][ C1] ? find_held_lock+0x2d/0x110 [ 904.124818][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 904.124822][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 904.124826][ C1] ? blackhole_dequeue+0x10/0x10 [ 904.124830][ C1] tc_new_tfilter+0x1398/0x2130 [ 904.124834][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 904.124838][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 904.124842][ C1] ? kernel_text_address+0xbd/0xf0 [ 904.124846][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 904.124849][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 904.124854][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 904.124857][ C1] netlink_rcv_skb+0x153/0x420 [ 904.124861][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 904.124865][ C1] ? netlink_ack+0xaa0/0xaa0 [ 904.124869][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 904.124873][ C1] netlink_unicast+0x533/0x7d0 [ 904.124877][ C1] ? netlink_attachskb+0x810/0x810 [ 904.124881][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 904.124885][ C1] ? __check_object_size+0x171/0x3f0 [ 904.124888][ C1] netlink_sendmsg+0x856/0xd90 [ 904.124892][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 904.124896][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 904.124900][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 904.124903][ C1] sock_sendmsg+0xcf/0x120 [ 904.124907][ C1] ____sys_sendmsg+0x331/0x810 [ 904.124911][ C1] ? kernel_sendmsg+0x50/0x50 [ 904.124915][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 904.124919][ C1] ? rcu_read_lock_sched_held+0x3a/0x70 [ 904.124922][ C1] ? kfree+0x2d3/0x360 [ 904.124926][ C1] ? mark_lock+0xf7/0x24c0 [ 904.124929][ C1] ___sys_sendmsg+0xf3/0x170 [ 904.124933][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 904.124937][ C1] ? find_held_lock+0x2d/0x110 [ 904.124941][ C1] ? security_file_alloc+0x34/0x170 [ 904.124945][ C1] ? fs_reclaim_release+0x90/0xd0 [ 904.124949][ C1] ? __lock_acquire+0xbe0/0x5c00 [ 904.124952][ C1] __sys_sendmmsg+0x292/0x470 [ 904.124956][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 904.124960][ C1] ? find_held_lock+0x2d/0x110 [ 904.124964][ C1] ? alloc_file_pseudo+0x1/0x250 [ 904.124968][ C1] ? __fd_install+0x1e6/0x600 [ 904.124971][ C1] ? __sys_socket+0x16d/0x200 [ 904.124976][ C1] __ia32_compat_sys_sendmmsg+0x9b/0x100 [ 904.124979][ C1] ? lockdep_hardirqs_on+0x79/0x100 [ 904.124983][ C1] __do_fast_syscall_32+0x56/0x80 [ 904.124987][ C1] do_fast_syscall_32+0x2f/0x70 [ 904.124992][ C1] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 904.124995][ C1] RIP: 0023:0xf7ff3549 [ 904.125007][ C1] Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 [ 904.125012][ C1] RSP: 002b:00000000ff8a4b4c EFLAGS: 00000296 ORIG_RAX: 0000000000000159 [ 904.125022][ C1] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000200 [ 904.125028][ C1] RDX: 00000000924926d3 RSI: 0000000000000000 RDI: 0000000000000010 [ 904.125033][ C1] RBP: 0000000000080002 R08: 0000000000000000 R09: 0000000000000000 [ 904.125038][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 904.125044][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 904.125050][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.398 msecs [ 904.125152][ T1655] Kernel panic - not syncing: hung_task: blocked tasks [ 904.711166][ T1655] CPU: 0 PID: 1655 Comm: khungtaskd Not tainted 5.10.0-rc4-syzkaller #0 [ 904.719482][ T1655] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 904.729618][ T1655] Call Trace: [ 904.732914][ T1655] dump_stack+0x107/0x163 [ 904.737281][ T1655] panic+0x306/0x73d [ 904.741183][ T1655] ? __warn_printk+0xf3/0xf3 [ 904.745783][ T1655] ? lapic_can_unplug_cpu+0x80/0x80 [ 904.750980][ T1655] ? preempt_schedule_thunk+0x16/0x18 [ 904.756375][ T1655] ? watchdog.cold+0x5/0x158 [ 904.760968][ T1655] ? watchdog+0xa80/0xfa0 [ 904.765302][ T1655] watchdog.cold+0x16/0x158 [ 904.769811][ T1655] ? reset_hung_task_detector+0x30/0x30 [ 904.775357][ T1655] kthread+0x3af/0x4a0 [ 904.779428][ T1655] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 904.785330][ T1655] ret_from_fork+0x1f/0x30 [ 904.790697][ T1655] Kernel Offset: disabled [ 904.795186][ T1655] Rebooting in 86400 seconds..