[ 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 '10.128.0.23' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 495.728786][ T6846] IPVS: ftp: loaded support on port[0] = 21 [ 657.208388][ T1166] INFO: task kworker/0:1:6838 blocked for more than 143 seconds. [ 657.216256][ T1166] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.225264][ T1166] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.234564][ T1166] task:kworker/0:1 state:D stack:30072 pid: 6838 ppid: 2 flags:0x00004000 [ 657.244453][ T1166] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.252215][ T1166] Call Trace: [ 657.255573][ T1166] __schedule+0xec9/0x2280 [ 657.260854][ T1166] ? io_schedule_timeout+0x140/0x140 [ 657.266244][ T1166] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.273161][ T1166] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.279005][ T1166] ? lockdep_hardirqs_on+0x53/0x100 [ 657.284200][ T1166] schedule+0xd0/0x2a0 [ 657.289176][ T1166] schedule_preempt_disabled+0xf/0x20 [ 657.294542][ T1166] __mutex_lock+0x3e2/0x10e0 [ 657.300044][ T1166] ? addrconf_verify_work+0xa/0x20 [ 657.305169][ T1166] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.311415][ T1166] ? lock_release+0x8f0/0x8f0 [ 657.316118][ T1166] ? lock_downgrade+0x830/0x830 [ 657.321892][ T1166] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.327090][ T1166] ? lock_is_held_type+0xbb/0xf0 [ 657.332971][ T1166] addrconf_verify_work+0xa/0x20 [ 657.337983][ T1166] process_one_work+0x94c/0x1670 [ 657.343854][ T1166] ? lock_release+0x8f0/0x8f0 [ 657.349118][ T1166] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.354605][ T1166] ? rwlock_bug.part.0+0x90/0x90 [ 657.360421][ T1166] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.365621][ T1166] worker_thread+0x64c/0x1120 [ 657.371225][ T1166] ? __kthread_parkme+0x13f/0x1e0 [ 657.376249][ T1166] ? process_one_work+0x1670/0x1670 [ 657.383399][ T1166] kthread+0x3b5/0x4a0 [ 657.387466][ T1166] ? __kthread_bind_mask+0xc0/0xc0 [ 657.393662][ T1166] ret_from_fork+0x1f/0x30 [ 657.398150][ T1166] [ 657.398150][ T1166] Showing all locks held in the system: [ 657.407634][ T1166] 1 lock held by khungtaskd/1166: [ 657.413871][ T1166] #0: ffffffff8a068480 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.424252][ T1166] 1 lock held by in:imklog/6529: [ 657.429703][ T1166] #0: ffff8880938eae30 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.439435][ T1166] 3 locks held by kworker/0:1/6838: [ 657.444633][ T1166] #0: ffff8880a3c13538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.456863][ T1166] #1: ffffc90000f07da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.467679][ T1166] #2: ffffffff8b17a448 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.477796][ T1166] 1 lock held by syz-executor311/6867: [ 657.483878][ T1166] [ 657.486199][ T1166] ============================================= [ 657.486199][ T1166] [ 657.495492][ T1166] NMI backtrace for cpu 1 [ 657.499905][ T1166] CPU: 1 PID: 1166 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.508136][ T1166] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.518170][ T1166] Call Trace: [ 657.521517][ T1166] dump_stack+0x198/0x1fd [ 657.525839][ T1166] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.531062][ T1166] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.536714][ T1166] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.542747][ T1166] watchdog+0xd7d/0x1000 [ 657.546984][ T1166] ? reset_hung_task_detector+0x30/0x30 [ 657.552536][ T1166] kthread+0x3b5/0x4a0 [ 657.556593][ T1166] ? __kthread_bind_mask+0xc0/0xc0 [ 657.561703][ T1166] ret_from_fork+0x1f/0x30 [ 657.566285][ T1166] Sending NMI from CPU 1 to CPUs 0: [ 657.573059][ C0] NMI backtrace for cpu 0 [ 657.573066][ C0] CPU: 0 PID: 6867 Comm: syz-executor311 Not tainted 5.9.0-rc8-syzkaller #0 [ 657.573072][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.573076][ C0] RIP: 0010:lock_acquire+0x2bc/0xaf0 [ 657.573088][ C0] Code: 00 00 00 00 48 c7 40 08 00 00 00 00 48 8b 84 24 b0 00 00 00 65 48 2b 04 25 28 00 00 00 0f 85 f0 06 00 00 48 81 c4 b8 00 00 00 <5b> 5d 41 5c 41 5d 41 5e 41 5f c3 65 44 8b 3d 31 68 a5 7e 41 83 ff [ 657.573092][ C0] RSP: 0018:ffffc90000f86b98 EFLAGS: 00000282 [ 657.573100][ C0] RAX: 0000000000000000 RBX: ffff8880a17f8340 RCX: 0000000000000001 [ 657.573105][ C0] RDX: dffffc0000000000 RSI: 0000000000000008 RDI: 0000000000000286 [ 657.573110][ C0] RBP: ffff888098d39068 R08: 0000000000000000 R09: ffffffff8d10faa7 [ 657.573115][ C0] R10: fffffbfff1a21f54 R11: 0000000000000000 R12: 0000000000000000 [ 657.573120][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000286 [ 657.573126][ C0] FS: 000000000126a880(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 [ 657.573130][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.573135][ C0] CR2: 00007f8a7a1c6008 CR3: 00000000a1cf2000 CR4: 00000000001506f0 [ 657.573140][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.573145][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.573148][ C0] Call Trace: [ 657.573151][ C0] __mutex_lock+0x134/0x10e0 [ 657.573155][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.573158][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.573162][ C0] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 657.573166][ C0] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.573170][ C0] ? __mutex_unlock_slowpath+0xe2/0x610 [ 657.573173][ C0] ? write_comp_data+0x78/0x80 [ 657.573177][ C0] ? wait_for_completion+0x260/0x260 [ 657.573180][ C0] tcf_idr_check_alloc+0x78/0x3b0 [ 657.573184][ C0] tcf_police_init+0x347/0x13a0 [ 657.573187][ C0] ? tcf_police_cleanup+0x60/0x60 [ 657.573190][ C0] ? find_held_lock+0x2d/0x110 [ 657.573194][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 657.573197][ C0] ? mark_held_locks+0x9f/0xe0 [ 657.573201][ C0] ? check_preemption_disabled+0x50/0x130 [ 657.573205][ C0] tcf_action_init_1+0x1a3/0x990 [ 657.573208][ C0] ? tcf_action_dump_old+0x80/0x80 [ 657.573211][ C0] ? kasan_save_stack+0x32/0x40 [ 657.573215][ C0] ? kasan_save_stack+0x1b/0x40 [ 657.573219][ C0] ? __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 657.573223][ C0] ? kmem_cache_alloc_trace+0x174/0x300 [ 657.573226][ C0] ? fw_change+0x4b5/0x13e0 [ 657.573229][ C0] ? tc_new_tfilter+0x1398/0x2130 [ 657.573233][ C0] ? rtnetlink_rcv_msg+0x80f/0xad0 [ 657.573236][ C0] ? netlink_rcv_skb+0x15a/0x430 [ 657.573240][ C0] ? netlink_unicast+0x533/0x7d0 [ 657.573243][ C0] ? netlink_sendmsg+0x856/0xd90 [ 657.573246][ C0] ? sock_sendmsg+0xcf/0x120 [ 657.573250][ C0] ? ____sys_sendmsg+0x331/0x810 [ 657.573253][ C0] ? ___sys_sendmsg+0xf3/0x170 [ 657.573256][ C0] ? __sys_sendmmsg+0x195/0x480 [ 657.573260][ C0] ? __x64_sys_sendmmsg+0x99/0x100 [ 657.573263][ C0] ? do_syscall_64+0x2d/0x70 [ 657.573267][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.573271][ C0] tcf_exts_validate+0x138/0x420 [ 657.573274][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 657.573277][ C0] ? mark_lock+0x82/0x1660 [ 657.573280][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.573284][ C0] fw_set_parms+0x13d/0xa30 [ 657.573287][ C0] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 657.573291][ C0] ? fw_delete+0x8c0/0x8c0 [ 657.573294][ C0] ? kmem_cache_alloc_trace+0x18e/0x300 [ 657.573297][ C0] ? __nla_parse+0x3d/0x4a [ 657.573300][ C0] fw_change+0x57e/0x13e0 [ 657.573304][ C0] ? lock_downgrade+0x830/0x830 [ 657.573307][ C0] ? fw_set_parms+0xa30/0xa30 [ 657.573310][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.573314][ C0] tc_new_tfilter+0x1398/0x2130 [ 657.573317][ C0] ? fw_set_parms+0xa30/0xa30 [ 657.573321][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.573325][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.573329][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.573332][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.573336][ C0] ? security_capable+0x8f/0xc0 [ 657.573339][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.573342][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.573346][ C0] rtnetlink_rcv_msg+0x80f/0xad0 [ 657.573350][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 657.573353][ C0] ? lock_acquire+0x1f3/0xaf0 [ 657.573357][ C0] ? netlink_deliver_tap+0x146/0xb70 [ 657.573360][ C0] netlink_rcv_skb+0x15a/0x430 [ 657.573364][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 657.573367][ C0] ? netlink_ack+0xa10/0xa10 [ 657.573371][ C0] ? __kmalloc_node_track_caller+0x38/0x60 [ 657.573374][ C0] netlink_unicast+0x533/0x7d0 [ 657.573378][ C0] ? netlink_attachskb+0x810/0x810 [ 657.573381][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 657.573385][ C0] ? __check_object_size+0x171/0x3e4 [ 657.573388][ C0] netlink_sendmsg+0x856/0xd90 [ 657.573392][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 657.573395][ C0] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 657.573399][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 657.573402][ C0] sock_sendmsg+0xcf/0x120 [ 657.573405][ C0] ____sys_sendmsg+0x331/0x810 [ 657.573408][ C0] ? kernel_sendmsg+0x50/0x50 [ 657.573411][ C0] ? do_recvmmsg+0x6d0/0x6d0 [ 657.573415][ C0] ? __lock_acquire+0x164a/0x5780 [ 657.573418][ C0] ___sys_sendmsg+0xf3/0x170 [ 657.573422][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 657.573426][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.573429][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.573433][ C0] ? find_held_lock+0x2d/0x110 [ 657.573436][ C0] ? __might_fault+0x11f/0x1d0 [ 657.573439][ C0] ? lock_downgrade+0x830/0x830 [ 657.573443][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.573446][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.573449][ C0] __sys_sendmmsg+0x195/0x480 [ 657.573453][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 657.573456][ C0] ? __might_fault+0x190/0x1d0 [ 657.573459][ C0] ? _copy_to_user+0x126/0x160 [ 657.573463][ C0] ? sockfd_lookup_light+0xc6/0x180 [ 657.573466][ C0] ? __sys_sendmsg+0x10c/0x1b0 [ 657.573470][ C0] ? __sys_sendmsg_sock+0xb0/0xb0 [ 657.573473][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.573477][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.573481][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 657.573485][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.573488][ C0] do_syscall_64+0x2d/0x70 [ 657.573492][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.573495][ C0] RIP: 0033:0x441579 [ 657.573505][ 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 [ 657.573509][ C0] RSP: 002b:00007ffdedc90f78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 657.573517][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441579 [ 657.573521][ C0] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 657.573525][ C0] RBP: 00007ffdedc90f80 R08: 0000000120080522 R09: 0000000120080522 [ 657.573530][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a28f0 [ 657.573534][ C0] R13: 0000000000402450 R14: 0000000000000000 R15: 0000000000000000 [ 657.573540][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 657.575831][ T1166] Kernel panic - not syncing: hung_task: blocked tasks [ 658.292440][ T1166] CPU: 1 PID: 1166 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 658.300650][ T1166] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.310697][ T1166] Call Trace: [ 658.313998][ T1166] dump_stack+0x198/0x1fd [ 658.318374][ T1166] panic+0x382/0x7fb [ 658.322257][ T1166] ? __warn_printk+0xf3/0xf3 [ 658.326848][ T1166] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.332463][ T1166] ? preempt_schedule_thunk+0x16/0x18 [ 658.337833][ T1166] ? watchdog.cold+0x5/0x16b [ 658.342408][ T1166] ? watchdog+0xa82/0x1000 [ 658.346844][ T1166] watchdog.cold+0x16/0x16b [ 658.351357][ T1166] ? reset_hung_task_detector+0x30/0x30 [ 658.356887][ T1166] kthread+0x3b5/0x4a0 [ 658.360966][ T1166] ? __kthread_bind_mask+0xc0/0xc0 [ 658.366066][ T1166] ret_from_fork+0x1f/0x30 [ 658.371890][ T1166] Kernel Offset: disabled [ 658.376210][ T1166] Rebooting in 86400 seconds..