[ 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 '10.128.0.108' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 498.057904][ T6908] IPVS: ftp: loaded support on port[0] = 21 [ 657.635462][ T1170] INFO: task kworker/1:1:23 blocked for more than 143 seconds. [ 657.643248][ T1170] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.654920][ T1170] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.664473][ T1170] task:kworker/1:1 state:D stack:27056 pid: 23 ppid: 2 flags:0x00004000 [ 657.674693][ T1170] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.681884][ T1170] Call Trace: [ 657.685256][ T1170] __schedule+0xec9/0x2280 [ 657.690799][ T1170] ? io_schedule_timeout+0x140/0x140 [ 657.696959][ T1170] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.703002][ T1170] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.709445][ T1170] ? lockdep_hardirqs_on+0x53/0x100 [ 657.714661][ T1170] schedule+0xd0/0x2a0 [ 657.719955][ T1170] schedule_preempt_disabled+0xf/0x20 [ 657.726019][ T1170] __mutex_lock+0x3e2/0x10e0 [ 657.730626][ T1170] ? addrconf_verify_work+0xa/0x20 [ 657.736963][ T1170] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.742674][ T1170] ? lock_release+0x8f0/0x8f0 [ 657.748494][ T1170] ? lock_downgrade+0x830/0x830 [ 657.753359][ T1170] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.759700][ T1170] ? lock_is_held_type+0xbb/0xf0 [ 657.764656][ T1170] addrconf_verify_work+0xa/0x20 [ 657.770785][ T1170] process_one_work+0x94c/0x1670 [ 657.777578][ T1170] ? lock_release+0x8f0/0x8f0 [ 657.782268][ T1170] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.788876][ T1170] ? rwlock_bug.part.0+0x90/0x90 [ 657.793832][ T1170] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.800259][ T1170] worker_thread+0x64c/0x1120 [ 657.804968][ T1170] ? process_one_work+0x1670/0x1670 [ 657.811355][ T1170] kthread+0x3b5/0x4a0 [ 657.816182][ T1170] ? __kthread_bind_mask+0xc0/0xc0 [ 657.821394][ T1170] ret_from_fork+0x1f/0x30 [ 657.827121][ T1170] [ 657.827121][ T1170] Showing all locks held in the system: [ 657.834852][ T1170] 3 locks held by kworker/1:1/23: [ 657.842326][ T1170] #0: ffff888099d02d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.854931][ T1170] #1: ffffc90000df7da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.865965][ T1170] #2: ffffffff8b14f0c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.876237][ T1170] 1 lock held by khungtaskd/1170: [ 657.881261][ T1170] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.892349][ T1170] 1 lock held by in:imklog/6804: [ 657.897981][ T1170] #0: ffff8880a16443b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.909235][ T1170] 2 locks held by syz-executor287/6930: [ 657.914819][ T1170] [ 657.918381][ T1170] ============================================= [ 657.918381][ T1170] [ 657.927510][ T1170] NMI backtrace for cpu 0 [ 657.931855][ T1170] CPU: 0 PID: 1170 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.940087][ T1170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.950134][ T1170] Call Trace: [ 657.953554][ T1170] dump_stack+0x198/0x1fd [ 657.957894][ T1170] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.963166][ T1170] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.968800][ T1170] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.974826][ T1170] watchdog+0xd7d/0x1000 [ 657.979073][ T1170] ? reset_hung_task_detector+0x30/0x30 [ 657.984633][ T1170] kthread+0x3b5/0x4a0 [ 657.988728][ T1170] ? __kthread_bind_mask+0xc0/0xc0 [ 657.993856][ T1170] ret_from_fork+0x1f/0x30 [ 657.998579][ T1170] Sending NMI from CPU 0 to CPUs 1: [ 658.005443][ C1] NMI backtrace for cpu 1 [ 658.005450][ C1] CPU: 1 PID: 6930 Comm: syz-executor287 Not tainted 5.9.0-rc8-syzkaller #0 [ 658.005456][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.005459][ C1] RIP: 0010:check_memory_region+0x17/0x180 [ 658.005469][ C1] Code: 0f 1f 00 48 89 f2 be f8 00 00 00 e9 b3 e9 24 02 0f 1f 00 48 85 f6 0f 84 70 01 00 00 49 89 f9 41 54 44 0f b6 c2 49 01 f1 55 53 <0f> 82 18 01 00 00 48 b8 ff ff ff ff ff 7f ff ff 48 39 c7 0f 86 05 [ 658.005473][ C1] RSP: 0018:ffffc90005616aa8 EFLAGS: 00000292 [ 658.005480][ C1] RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff815c096e [ 658.005485][ C1] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8b5980c8 [ 658.005489][ C1] RBP: ffff8880a667c868 R08: 0000000000000000 R09: ffffffff8b5980d0 [ 658.005494][ C1] R10: ffffed1014ccf900 R11: 0000000000000000 R12: 0000000000000000 [ 658.005498][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 [ 658.005503][ C1] FS: 0000000000000000(0000) GS:ffff8880ae500000(0063) knlGS:0000000008bdf840 [ 658.005507][ C1] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 658.005512][ C1] CR2: 00007f7ed2de86c0 CR3: 0000000088584000 CR4: 00000000001506e0 [ 658.005516][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 658.005521][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 658.005523][ C1] Call Trace: [ 658.005526][ C1] lock_acquire+0xbe/0xaf0 [ 658.005529][ C1] ? lock_release+0x8f0/0x8f0 [ 658.005533][ C1] ? arch_local_irq_save+0x13/0x90 [ 658.005536][ C1] ? lock_is_held_type+0xbb/0xf0 [ 658.005539][ C1] __mutex_lock+0x134/0x10e0 [ 658.005542][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 658.005545][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 658.005549][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 658.005552][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 658.005555][ C1] ? wait_for_completion+0x260/0x260 [ 658.005559][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 658.005562][ C1] tcf_police_init+0x347/0x13a0 [ 658.005565][ C1] ? tcf_police_cleanup+0x60/0x60 [ 658.005568][ C1] ? find_held_lock+0x2d/0x110 [ 658.005571][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 658.005575][ C1] tcf_action_init_1+0x1a3/0x990 [ 658.005578][ C1] ? tcf_action_dump_old+0x80/0x80 [ 658.005581][ C1] ? lock_acquire+0x1f3/0xaf0 [ 658.005584][ C1] ? lock_is_held_type+0xbb/0xf0 [ 658.005588][ C1] ? find_held_lock+0x2d/0x110 [ 658.005591][ C1] ? fs_reclaim_release+0x90/0xd0 [ 658.005594][ C1] ? mark_lock+0x82/0x1660 [ 658.005597][ C1] tcf_exts_validate+0x138/0x420 [ 658.005600][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 658.005603][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 658.005606][ C1] ? __nla_parse+0x3d/0x4a [ 658.005609][ C1] rsvp_change+0x291/0x27a0 [ 658.005612][ C1] ? lock_is_held_type+0xbb/0xf0 [ 658.005615][ C1] ? lock_is_held_type+0xbb/0xf0 [ 658.005618][ C1] ? find_held_lock+0x2d/0x110 [ 658.005622][ C1] ? tc_new_tfilter+0x1be4/0x2130 [ 658.005625][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 658.005628][ C1] ? lock_downgrade+0x830/0x830 [ 658.005631][ C1] ? blackhole_dequeue+0x10/0x10 [ 658.005634][ C1] ? lock_is_held_type+0xbb/0xf0 [ 658.005638][ C1] tc_new_tfilter+0x1398/0x2130 [ 658.005641][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 658.005644][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 658.005648][ C1] ? entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 658.005652][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 658.005655][ C1] ? lock_is_held_type+0xbb/0xf0 [ 658.005658][ C1] ? security_capable+0x8f/0xc0 [ 658.005661][ C1] ? lock_is_held_type+0xbb/0xf0 [ 658.005665][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 658.005668][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 658.005671][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 658.005674][ C1] ? lock_acquire+0x1f3/0xaf0 [ 658.005678][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 658.005681][ C1] netlink_rcv_skb+0x15a/0x430 [ 658.005684][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 658.005687][ C1] ? netlink_ack+0xa10/0xa10 [ 658.005690][ C1] ? __kmalloc_node_track_caller+0x38/0x60 [ 658.005694][ C1] netlink_unicast+0x533/0x7d0 [ 658.005697][ C1] ? netlink_attachskb+0x810/0x810 [ 658.005700][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 658.005703][ C1] ? __check_object_size+0x171/0x3e4 [ 658.005706][ C1] netlink_sendmsg+0x856/0xd90 [ 658.005709][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 658.005713][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 658.005716][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 658.005719][ C1] sock_sendmsg+0xcf/0x120 [ 658.005722][ C1] ____sys_sendmsg+0x331/0x810 [ 658.005725][ C1] ? kernel_sendmsg+0x50/0x50 [ 658.005728][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 658.005731][ C1] ? sock_alloc_file+0x4f/0x190 [ 658.005734][ C1] ? __sys_socket+0x13d/0x200 [ 658.005737][ C1] ? __ia32_sys_socket+0x6f/0xb0 [ 658.005741][ C1] ? __do_fast_syscall_32+0x60/0x90 [ 658.005744][ C1] ? lock_is_held_type+0xbb/0xf0 [ 658.005747][ C1] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 658.005750][ C1] ___sys_sendmsg+0xf3/0x170 [ 658.005754][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 658.005757][ C1] ? fs_reclaim_release+0x90/0xd0 [ 658.005760][ C1] ? lock_downgrade+0x830/0x830 [ 658.005763][ C1] ? mark_lock+0x82/0x1660 [ 658.005766][ C1] ? lock_is_held_type+0xbb/0xf0 [ 658.005769][ C1] ? __lock_acquire+0xb92/0x5780 [ 658.005773][ C1] ? lock_is_held_type+0xbb/0xf0 [ 658.005775][ C1] __sys_sendmmsg+0x296/0x480 [ 658.005778][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 658.005781][ C1] ? find_held_lock+0x2d/0x110 [ 658.005784][ C1] ? __fd_install+0x1b4/0x600 [ 658.005786][ C1] ? alloc_file_pseudo+0x1/0x250 [ 658.005789][ C1] ? lock_is_held_type+0xbb/0xf0 [ 658.005792][ C1] ? __fd_install+0x1e6/0x600 [ 658.005795][ C1] ? __sys_socket+0x16d/0x200 [ 658.005798][ C1] ? lock_is_held_type+0xbb/0xf0 [ 658.005801][ C1] ? lock_is_held_type+0xbb/0xf0 [ 658.005804][ C1] __ia32_compat_sys_sendmmsg+0x9b/0x100 [ 658.005807][ C1] ? lockdep_hardirqs_on+0x53/0x100 [ 658.005810][ C1] __do_fast_syscall_32+0x60/0x90 [ 658.005812][ C1] do_fast_syscall_32+0x2f/0x70 [ 658.005816][ C1] entry_SYSENTER_compat_after_hwframe+0x4d/0x5c [ 658.005818][ C1] RIP: 0023:0xf7f08549 [ 658.005827][ 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 [ 658.005830][ C1] RSP: 002b:00000000ffd7edfc EFLAGS: 00000292 ORIG_RAX: 0000000000000159 [ 658.005837][ C1] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000020000200 [ 658.005842][ C1] RDX: 00000000924926d3 RSI: 0000000000000000 RDI: 0000000000000010 [ 658.005846][ C1] RBP: 0000000000080002 R08: 0000000000000000 R09: 0000000000000000 [ 658.005850][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 658.005854][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 658.005859][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 658.025286][ T1170] Kernel panic - not syncing: hung_task: blocked tasks [ 658.694600][ T1170] CPU: 0 PID: 1170 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 658.702827][ T1170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.712875][ T1170] Call Trace: [ 658.716176][ T1170] dump_stack+0x198/0x1fd [ 658.720586][ T1170] panic+0x382/0x7fb [ 658.724484][ T1170] ? __warn_printk+0xf3/0xf3 [ 658.729166][ T1170] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.734883][ T1170] ? preempt_schedule_thunk+0x16/0x18 [ 658.740255][ T1170] ? watchdog.cold+0x5/0x16b [ 658.744837][ T1170] ? watchdog+0xa82/0x1000 [ 658.749253][ T1170] watchdog.cold+0x16/0x16b [ 658.753757][ T1170] ? reset_hung_task_detector+0x30/0x30 [ 658.759300][ T1170] kthread+0x3b5/0x4a0 [ 658.763363][ T1170] ? __kthread_bind_mask+0xc0/0xc0 [ 658.768475][ T1170] ret_from_fork+0x1f/0x30 [ 658.774467][ T1170] Kernel Offset: disabled [ 658.778845][ T1170] Rebooting in 86400 seconds..