[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.56' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 497.796504][ T6875] IPVS: ftp: loaded support on port[0] = 21 executing program [ 497.837610][ T6897] netlink: 388 bytes leftover after parsing attributes in process `syz-executor670'. [ 497.854801][ T6898] netlink: 388 bytes leftover after parsing attributes in process `syz-executor670'. [ 657.246319][ T1178] INFO: task kworker/0:1:6867 blocked for more than 143 seconds. [ 657.254259][ T1178] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.262636][ T1178] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.272363][ T1178] task:kworker/0:1 state:D stack:29440 pid: 6867 ppid: 2 flags:0x00004000 [ 657.282777][ T1178] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.290029][ T1178] Call Trace: [ 657.293427][ T1178] __schedule+0xec9/0x2280 [ 657.300387][ T1178] ? io_schedule_timeout+0x140/0x140 [ 657.305840][ T1178] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.313439][ T1178] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.319508][ T1178] ? lockdep_hardirqs_on+0x53/0x100 [ 657.324728][ T1178] schedule+0xd0/0x2a0 [ 657.330205][ T1178] schedule_preempt_disabled+0xf/0x20 [ 657.335592][ T1178] __mutex_lock+0x3e2/0x10e0 [ 657.341499][ T1178] ? addrconf_verify_work+0xa/0x20 [ 657.347520][ T1178] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.353434][ T1178] ? lock_release+0x8f0/0x8f0 [ 657.359453][ T1178] ? lock_downgrade+0x830/0x830 [ 657.364327][ T1178] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.370962][ T1178] ? lock_is_held_type+0xbb/0xf0 [ 657.375945][ T1178] addrconf_verify_work+0xa/0x20 [ 657.382366][ T1178] process_one_work+0x94c/0x1670 [ 657.388325][ T1178] ? lock_release+0x8f0/0x8f0 [ 657.393021][ T1178] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.400016][ T1178] ? rwlock_bug.part.0+0x90/0x90 [ 657.405015][ T1178] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.411838][ T1178] worker_thread+0x64c/0x1120 [ 657.417731][ T1178] ? __kthread_parkme+0x13f/0x1e0 [ 657.422792][ T1178] ? process_one_work+0x1670/0x1670 [ 657.430601][ T1178] kthread+0x3b5/0x4a0 [ 657.434684][ T1178] ? __kthread_bind_mask+0xc0/0xc0 [ 657.441197][ T1178] ret_from_fork+0x1f/0x30 [ 657.445716][ T1178] [ 657.445716][ T1178] Showing all locks held in the system: [ 657.455021][ T1178] 1 lock held by khungtaskd/1178: [ 657.461001][ T1178] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.473511][ T1178] 1 lock held by in:imklog/6577: [ 657.479276][ T1178] #0: ffff888093864df0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.489786][ T1178] 3 locks held by kworker/0:1/6867: [ 657.495010][ T1178] #0: ffff888214d2b138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.507473][ T1178] #1: ffffc90003d57da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.519122][ T1178] #2: ffffffff8b150988 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.530224][ T1178] 1 lock held by syz-executor670/6898: [ 657.535813][ T1178] [ 657.539587][ T1178] ============================================= [ 657.539587][ T1178] [ 657.549174][ T1178] NMI backtrace for cpu 0 [ 657.553524][ T1178] CPU: 0 PID: 1178 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.561766][ T1178] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.571819][ T1178] Call Trace: [ 657.575230][ T1178] dump_stack+0x198/0x1fd [ 657.579579][ T1178] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.584838][ T1178] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.590479][ T1178] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.596605][ T1178] watchdog+0xd7d/0x1000 [ 657.600860][ T1178] ? reset_hung_task_detector+0x30/0x30 [ 657.606433][ T1178] kthread+0x3b5/0x4a0 [ 657.610506][ T1178] ? __kthread_bind_mask+0xc0/0xc0 [ 657.615628][ T1178] ret_from_fork+0x1f/0x30 [ 657.620283][ T1178] Sending NMI from CPU 0 to CPUs 1: [ 657.627113][ C1] NMI backtrace for cpu 1 [ 657.627121][ C1] CPU: 1 PID: 6898 Comm: syz-executor670 Not tainted 5.9.0-rc8-syzkaller #0 [ 657.627127][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.627132][ C1] RIP: 0010:lock_is_held_type+0x72/0xf0 [ 657.627143][ C1] Code: 00 00 85 c0 7f 0d eb 7d 83 c3 01 3b 9d e0 08 00 00 7d 72 48 63 c3 4c 89 e6 48 8d 04 80 4d 8d 74 c5 00 4c 89 f7 e8 4e fc ff ff <85> c0 74 da 8b 4c 24 04 41 bc 01 00 00 00 83 f9 ff 74 11 41 0f b6 [ 657.627148][ C1] RSP: 0018:ffffc90000ea6c20 EFLAGS: 00000046 [ 657.627157][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 657.627162][ C1] RDX: dffffc0000000000 RSI: ffffffff8a067ee0 RDI: ffff888092c8e9e8 [ 657.627168][ C1] RBP: ffff888092c8e100 R08: ffffffff868ae5e8 R09: ffff88809eaf4207 [ 657.627173][ C1] R10: ffffed1013d5e840 R11: 0000000000000000 R12: ffffffff8a067ee0 [ 657.627185][ C1] R13: ffff888092c8e9e8 R14: ffff888092c8e9e8 R15: 0000000000000286 [ 657.627192][ C1] FS: 0000000001858880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 657.627197][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.627202][ C1] CR2: 00000000006cd080 CR3: 00000000a2611000 CR4: 00000000001506e0 [ 657.627207][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.627213][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.627216][ C1] Call Trace: [ 657.627220][ C1] ___might_sleep+0x22b/0x2f0 [ 657.627223][ C1] __mutex_lock+0xa9/0x10e0 [ 657.627228][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.627232][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 657.627235][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.627240][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 657.627244][ C1] ? wait_for_completion+0x260/0x260 [ 657.627248][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 657.627252][ C1] tcf_police_init+0x347/0x13a0 [ 657.627256][ C1] ? tcf_police_cleanup+0x60/0x60 [ 657.627259][ C1] ? find_held_lock+0x2d/0x110 [ 657.627263][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 657.627267][ C1] tcf_action_init_1+0x1a3/0x990 [ 657.627271][ C1] ? tcf_action_dump_old+0x80/0x80 [ 657.627275][ C1] ? lock_acquire+0x1f3/0xaf0 [ 657.627279][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.627283][ C1] ? find_held_lock+0x2d/0x110 [ 657.627287][ C1] ? fs_reclaim_release+0x90/0xd0 [ 657.627291][ C1] ? mark_lock+0x82/0x1660 [ 657.627294][ C1] tcf_exts_validate+0x138/0x420 [ 657.627298][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 657.627303][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 657.627306][ C1] ? __nla_parse+0x3d/0x4a [ 657.627310][ C1] route4_change+0x6d8/0x2380 [ 657.627314][ C1] ? route4_delete+0xb70/0xb70 [ 657.627318][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.627321][ C1] tc_new_tfilter+0x1398/0x2130 [ 657.627325][ C1] ? route4_delete+0xb70/0xb70 [ 657.627329][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.627334][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.627338][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.627342][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.627346][ C1] ? security_capable+0x8f/0xc0 [ 657.627350][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.627354][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.627358][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 657.627362][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.627366][ C1] ? lock_acquire+0x1f3/0xaf0 [ 657.627370][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 657.627373][ C1] netlink_rcv_skb+0x15a/0x430 [ 657.627378][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.627381][ C1] ? netlink_ack+0xa10/0xa10 [ 657.627386][ C1] ? __kmalloc_node_track_caller+0x38/0x60 [ 657.627389][ C1] netlink_unicast+0x533/0x7d0 [ 657.627393][ C1] ? netlink_attachskb+0x810/0x810 [ 657.627397][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 657.627401][ C1] ? __check_object_size+0x171/0x3e4 [ 657.627405][ C1] netlink_sendmsg+0x856/0xd90 [ 657.627409][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.627413][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 657.627417][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.627421][ C1] sock_sendmsg+0xcf/0x120 [ 657.627424][ C1] ____sys_sendmsg+0x331/0x810 [ 657.627428][ C1] ? kernel_sendmsg+0x50/0x50 [ 657.627432][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 657.627436][ C1] ? sock_alloc_file+0x4f/0x190 [ 657.627440][ C1] ? __lock_acquire+0x164a/0x5780 [ 657.627443][ C1] ___sys_sendmsg+0xf3/0x170 [ 657.627447][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 657.627452][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.627456][ C1] ? fs_reclaim_release+0x90/0xd0 [ 657.627460][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.627464][ C1] ? find_held_lock+0x2d/0x110 [ 657.627467][ C1] ? __might_fault+0x11f/0x1d0 [ 657.627471][ C1] ? lock_downgrade+0x830/0x830 [ 657.627475][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.627479][ C1] __sys_sendmmsg+0x195/0x480 [ 657.627483][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 657.627487][ C1] ? find_held_lock+0x2d/0x110 [ 657.627491][ C1] ? __fd_install+0x1b4/0x600 [ 657.627495][ C1] ? alloc_file_pseudo+0x1/0x250 [ 657.627499][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.627503][ C1] ? __fd_install+0x1e6/0x600 [ 657.627507][ C1] ? __sys_socket+0x16d/0x200 [ 657.627511][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.627516][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.627520][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 657.627524][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.627528][ C1] do_syscall_64+0x2d/0x70 [ 657.627533][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.627536][ C1] RIP: 0033:0x441599 [ 657.627549][ C1] 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 [ 657.627553][ C1] RSP: 002b:00007ffeb1c85808 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 657.627563][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441599 [ 657.627569][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 657.627575][ C1] RBP: 00007ffeb1c85810 R08: 0000000100000000 R09: 0000000100000000 [ 657.627581][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000798ac [ 657.627586][ C1] R13: 0000000000402470 R14: 0000000000000000 R15: 0000000000000000 [ 657.627593][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 657.646142][ T1178] Kernel panic - not syncing: hung_task: blocked tasks [ 658.251498][ T1178] CPU: 0 PID: 1178 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 658.259724][ T1178] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.269790][ T1178] Call Trace: [ 658.273090][ T1178] dump_stack+0x198/0x1fd [ 658.277520][ T1178] panic+0x382/0x7fb [ 658.281421][ T1178] ? __warn_printk+0xf3/0xf3 [ 658.286012][ T1178] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.291670][ T1178] ? preempt_schedule_thunk+0x16/0x18 [ 658.297050][ T1178] ? watchdog.cold+0x5/0x16b [ 658.301639][ T1178] ? watchdog+0xa82/0x1000 [ 658.306079][ T1178] watchdog.cold+0x16/0x16b [ 658.310584][ T1178] ? reset_hung_task_detector+0x30/0x30 [ 658.316391][ T1178] kthread+0x3b5/0x4a0 [ 658.320456][ T1178] ? __kthread_bind_mask+0xc0/0xc0 [ 658.325570][ T1178] ret_from_fork+0x1f/0x30 [ 658.331410][ T1178] Kernel Offset: disabled [ 658.335733][ T1178] Rebooting in 86400 seconds..