[ 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 '10.128.0.158' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 613.925203][ T8498] IPVS: ftp: loaded support on port[0] = 21 [ 613.966236][ T8520] netlink: 8 bytes leftover after parsing attributes in process `syz-executor816'. [ 613.976163][ T8520] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor816'. [ 613.987599][ T8520] netlink: 8 bytes leftover after parsing attributes in process `syz-executor816'. [ 613.997513][ T8520] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor816'. [ 780.219372][ T1653] INFO: task kworker/1:1:8490 blocked for more than 143 seconds. [ 780.227281][ T1653] Not tainted 5.10.0-rc2-syzkaller #0 [ 780.235003][ T1653] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 780.244520][ T1653] task:kworker/1:1 state:D stack:29616 pid: 8490 ppid: 2 flags:0x00004000 [ 780.254744][ T1653] Workqueue: ipv6_addrconf addrconf_verify_work [ 780.262019][ T1653] Call Trace: [ 780.265352][ T1653] __schedule+0x893/0x2130 [ 780.272102][ T1653] ? io_schedule_timeout+0x140/0x140 [ 780.277400][ T1653] ? _raw_spin_unlock_irq+0x1f/0x40 [ 780.283868][ T1653] ? lockdep_hardirqs_on+0x79/0x100 [ 780.289081][ T1653] schedule+0xcf/0x270 [ 780.294276][ T1653] schedule_preempt_disabled+0xf/0x20 [ 780.300547][ T1653] __mutex_lock+0x3e2/0x10e0 [ 780.305150][ T1653] ? addrconf_verify_work+0xa/0x20 [ 780.311412][ T1653] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.316889][ T1653] ? lock_release+0x710/0x710 [ 780.322748][ T1653] ? lock_downgrade+0x6d0/0x6d0 [ 780.327629][ T1653] addrconf_verify_work+0xa/0x20 [ 780.333742][ T1653] process_one_work+0x933/0x15a0 [ 780.338698][ T1653] ? lock_release+0x710/0x710 [ 780.344540][ T1653] ? pwq_dec_nr_in_flight+0x320/0x320 [ 780.351487][ T1653] ? rwlock_bug.part.0+0x90/0x90 [ 780.356445][ T1653] ? _raw_spin_lock_irq+0x41/0x50 [ 780.362697][ T1653] worker_thread+0x64c/0x1120 [ 780.367403][ T1653] ? __kthread_parkme+0x13f/0x1e0 [ 780.373784][ T1653] ? process_one_work+0x15a0/0x15a0 [ 780.378999][ T1653] kthread+0x3af/0x4a0 [ 780.384319][ T1653] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 780.391013][ T1653] ret_from_fork+0x1f/0x30 [ 780.395520][ T1653] [ 780.395520][ T1653] Showing all locks held in the system: [ 780.405803][ T1653] 1 lock held by khungtaskd/1653: [ 780.411615][ T1653] #0: ffffffff8b337160 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 780.422437][ T1653] 1 lock held by in:imklog/8175: [ 780.427371][ T1653] #0: ffff888013713270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 780.438242][ T1653] 3 locks held by kworker/1:1/8490: [ 780.444803][ T1653] #0: ffff888020dfc938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 [ 780.456593][ T1653] #1: ffffc9000188fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 [ 780.467598][ T1653] #2: ffffffff8c927148 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 780.477729][ T1653] 2 locks held by syz-executor816/8520: [ 780.483995][ T1653] [ 780.486324][ T1653] ============================================= [ 780.486324][ T1653] [ 780.496117][ T1653] NMI backtrace for cpu 0 [ 780.500660][ T1653] CPU: 0 PID: 1653 Comm: khungtaskd Not tainted 5.10.0-rc2-syzkaller #0 [ 780.508977][ T1653] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.519029][ T1653] Call Trace: [ 780.522372][ T1653] dump_stack+0x107/0x163 [ 780.526705][ T1653] nmi_cpu_backtrace.cold+0x44/0xd7 [ 780.531978][ T1653] ? lapic_can_unplug_cpu+0x80/0x80 [ 780.537232][ T1653] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 780.543244][ T1653] watchdog+0xd43/0xfa0 [ 780.547426][ T1653] ? reset_hung_task_detector+0x30/0x30 [ 780.552971][ T1653] kthread+0x3af/0x4a0 [ 780.557044][ T1653] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 780.562938][ T1653] ret_from_fork+0x1f/0x30 [ 780.567525][ T1653] Sending NMI from CPU 0 to CPUs 1: [ 780.574137][ C1] NMI backtrace for cpu 1 [ 780.574144][ C1] CPU: 1 PID: 8520 Comm: syz-executor816 Not tainted 5.10.0-rc2-syzkaller #0 [ 780.574150][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.574154][ C1] RIP: 0010:mark_lock+0xa2/0x24c0 [ 780.574166][ C1] Code: 24 10 01 00 00 31 c0 41 83 fc 09 0f 87 54 01 00 00 41 83 fc 08 48 89 f5 0f 84 00 01 00 00 41 be 01 00 00 00 44 89 e1 41 d3 e6 <4d> 63 f6 48 8d 45 20 48 89 c2 48 89 44 24 08 48 b8 00 00 00 00 00 [ 780.574170][ C1] RSP: 0018:ffffc90000eee840 EFLAGS: 00000002 [ 780.574179][ C1] RAX: 0000000000000000 RBX: 1ffff920001ddd0f RCX: 0000000000000002 [ 780.574184][ C1] RDX: dffffc0000000000 RSI: ffff8880147e3db8 RDI: ffff8880147e3480 [ 780.574189][ C1] RBP: ffff8880147e3db8 R08: 0000000000000000 R09: ffffffff8ebad67f [ 780.574194][ C1] R10: fffffbfff1d75acf R11: 0000000000000000 R12: 0000000000000002 [ 780.574200][ C1] R13: ffff8880147e3dda R14: 0000000000000004 R15: ffff8880147e3d90 [ 780.574205][ C1] FS: 0000000000000000(0000) GS:ffff8880b9f00000(0063) knlGS:0000000009a54840 [ 780.574210][ C1] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 780.574215][ C1] CR2: 00007f04438e7000 CR3: 0000000014fdb000 CR4: 00000000001506e0 [ 780.574220][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 780.574225][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 780.574228][ C1] Call Trace: [ 780.574232][ C1] ? lock_chain_count+0x20/0x20 [ 780.574236][ C1] ? rcu_read_lock_sched_held+0x3a/0x70 [ 780.574244][ C1] ? find_held_lock+0x2d/0x110 [ 780.574248][ C1] ? finish_task_switch+0x150/0x7a0 [ 780.574252][ C1] __lock_acquire+0x83f/0x5590 [ 780.574255][ C1] ? finish_task_switch+0x122/0x7a0 [ 780.574259][ C1] ? __switch_to+0x57c/0x1050 [ 780.574263][ C1] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 780.574267][ C1] lock_acquire+0x2a3/0x8c0 [ 780.574270][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 780.574274][ C1] ? lock_release+0x710/0x710 [ 780.574278][ C1] ? preempt_schedule_notrace_thunk+0x16/0x31 [ 780.574282][ C1] __mutex_lock+0x134/0x10e0 [ 780.574285][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 780.574289][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 780.574293][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.574297][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 780.574301][ C1] ? wait_for_completion+0x260/0x260 [ 780.574305][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 780.574308][ C1] tcf_police_init+0x347/0x13a0 [ 780.574312][ C1] ? tcf_police_cleanup+0x60/0x60 [ 780.574316][ C1] ? find_held_lock+0x2d/0x110 [ 780.574319][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 780.574324][ C1] ? stack_trace_consume_entry+0x160/0x160 [ 780.574327][ C1] tcf_action_init_1+0x1a3/0x990 [ 780.574331][ C1] ? tcf_action_dump_old+0x80/0x80 [ 780.574335][ C1] ? ___sys_sendmsg+0xf3/0x170 [ 780.574338][ C1] ? __sys_sendmmsg+0x292/0x470 [ 780.574342][ C1] ? __ia32_compat_sys_sendmmsg+0x9b/0x100 [ 780.574346][ C1] ? __do_fast_syscall_32+0x56/0x80 [ 780.574350][ C1] ? do_fast_syscall_32+0x2f/0x70 [ 780.574355][ C1] ? entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 780.574358][ C1] ? find_held_lock+0x2d/0x110 [ 780.574362][ C1] tcf_exts_validate+0x138/0x420 [ 780.574366][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 780.574369][ C1] ? kasan_unpoison_shadow+0x33/0x40 [ 780.574373][ C1] rsvp_change+0x291/0x2990 [ 780.574376][ C1] ? find_held_lock+0x2d/0x110 [ 780.574380][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 780.574384][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 780.574388][ C1] ? blackhole_dequeue+0x10/0x10 [ 780.574391][ C1] tc_new_tfilter+0x1398/0x2130 [ 780.574395][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 780.574399][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.574403][ C1] ? lock_chain_count+0x20/0x20 [ 780.574406][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.574410][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 780.574414][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 780.574417][ C1] netlink_rcv_skb+0x153/0x420 [ 780.574421][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 780.574425][ C1] ? netlink_ack+0xaa0/0xaa0 [ 780.574429][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 780.574432][ C1] netlink_unicast+0x533/0x7d0 [ 780.574436][ C1] ? netlink_attachskb+0x810/0x810 [ 780.574439][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 780.574443][ C1] ? __check_object_size+0x171/0x3f0 [ 780.574447][ C1] netlink_sendmsg+0x856/0xd90 [ 780.574450][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 780.574454][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 780.574458][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 780.574461][ C1] sock_sendmsg+0xcf/0x120 [ 780.574465][ C1] ____sys_sendmsg+0x331/0x810 [ 780.574468][ C1] ? kernel_sendmsg+0x50/0x50 [ 780.574472][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 780.574476][ C1] ? rcu_read_lock_sched_held+0x3a/0x70 [ 780.574479][ C1] ? kfree+0x2d3/0x360 [ 780.574482][ C1] ? mark_lock+0xf7/0x24c0 [ 780.574486][ C1] ___sys_sendmsg+0xf3/0x170 [ 780.574490][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 780.574493][ C1] ? find_held_lock+0x2d/0x110 [ 780.574497][ C1] ? fs_reclaim_release+0x90/0xd0 [ 780.574500][ C1] ? __lock_acquire+0xbbf/0x5590 [ 780.574504][ C1] __sys_sendmmsg+0x292/0x470 [ 780.574508][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 780.574511][ C1] ? find_held_lock+0x2d/0x110 [ 780.574515][ C1] ? alloc_file_pseudo+0x1/0x250 [ 780.574518][ C1] ? __fd_install+0x1e6/0x600 [ 780.574522][ C1] ? __sys_socket+0x16d/0x200 [ 780.574526][ C1] __ia32_compat_sys_sendmmsg+0x9b/0x100 [ 780.574530][ C1] ? lockdep_hardirqs_on+0x79/0x100 [ 780.574534][ C1] __do_fast_syscall_32+0x56/0x80 [ 780.574538][ C1] do_fast_syscall_32+0x2f/0x70 [ 780.574542][ C1] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 780.574545][ C1] RIP: 0023:0xf7fed549 [ 780.574556][ 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 [ 780.574561][ C1] RSP: 002b:00000000ff9d10bc EFLAGS: 00000292 ORIG_RAX: 0000000000000159 [ 780.574570][ C1] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000200 [ 780.574575][ C1] RDX: 00000000924926d3 RSI: 0000000000000000 RDI: 0000000000000010 [ 780.574580][ C1] RBP: 0000000000080002 R08: 0000000000000000 R09: 0000000000000000 [ 780.574585][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 780.574590][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 780.574596][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.309 msecs [ 780.575969][ T1653] Kernel panic - not syncing: hung_task: blocked tasks [ 781.219247][ T1653] CPU: 0 PID: 1653 Comm: khungtaskd Not tainted 5.10.0-rc2-syzkaller #0 [ 781.227569][ T1653] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 781.237617][ T1653] Call Trace: [ 781.240914][ T1653] dump_stack+0x107/0x163 [ 781.245281][ T1653] panic+0x306/0x73d [ 781.249176][ T1653] ? __warn_printk+0xf3/0xf3 [ 781.253793][ T1653] ? lapic_can_unplug_cpu+0x80/0x80 [ 781.258988][ T1653] ? preempt_schedule_thunk+0x16/0x18 [ 781.264379][ T1653] ? watchdog.cold+0x5/0x158 [ 781.268965][ T1653] ? watchdog+0xa80/0xfa0 [ 781.273300][ T1653] watchdog.cold+0x16/0x158 [ 781.277806][ T1653] ? reset_hung_task_detector+0x30/0x30 [ 781.283351][ T1653] kthread+0x3af/0x4a0 [ 781.287418][ T1653] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 781.293311][ T1653] ret_from_fork+0x1f/0x30 [ 781.298542][ T1653] Kernel Offset: disabled [ 781.303011][ T1653] Rebooting in 86400 seconds..