[ 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 '10.128.0.25' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 611.812007][ T8474] IPVS: ftp: loaded support on port[0] = 21 [ 864.869606][ T1658] INFO: task kworker/1:1:34 blocked for more than 143 seconds. [ 864.877348][ T1658] Not tainted 5.11.0-rc4-syzkaller #0 [ 864.887970][ T1658] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 864.897393][ T1658] task:kworker/1:1 state:D stack:28528 pid: 34 ppid: 2 flags:0x00004000 [ 864.907252][ T1658] Workqueue: ipv6_addrconf addrconf_verify_work [ 864.914302][ T1658] Call Trace: [ 864.917636][ T1658] __schedule+0x90c/0x21a0 [ 864.923112][ T1658] ? io_schedule_timeout+0x140/0x140 [ 864.928437][ T1658] ? _raw_spin_unlock_irq+0x1f/0x40 [ 864.934894][ T1658] ? lockdep_hardirqs_on+0x79/0x100 [ 864.940689][ T1658] schedule+0xcf/0x270 [ 864.944785][ T1658] schedule_preempt_disabled+0xf/0x20 [ 864.951177][ T1658] __mutex_lock+0x81a/0x1110 [ 864.955794][ T1658] ? addrconf_verify_work+0xa/0x20 [ 864.961868][ T1658] ? mutex_lock_io_nested+0xf60/0xf60 [ 864.967270][ T1658] ? lock_release+0x710/0x710 [ 864.973069][ T1658] ? lock_downgrade+0x6d0/0x6d0 [ 864.977970][ T1658] addrconf_verify_work+0xa/0x20 [ 864.983921][ T1658] process_one_work+0x98d/0x15f0 [ 864.988952][ T1658] ? pwq_dec_nr_in_flight+0x320/0x320 [ 864.995744][ T1658] ? rwlock_bug.part.0+0x90/0x90 [ 865.001338][ T1658] ? _raw_spin_lock_irq+0x41/0x50 [ 865.006402][ T1658] worker_thread+0x64c/0x1120 [ 865.013299][ T1658] ? __kthread_parkme+0x13f/0x1e0 [ 865.018391][ T1658] ? process_one_work+0x15f0/0x15f0 [ 865.024567][ T1658] kthread+0x3b1/0x4a0 [ 865.028657][ T1658] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 865.035615][ T1658] ret_from_fork+0x1f/0x30 [ 865.040852][ T1658] [ 865.040852][ T1658] Showing all locks held in the system: [ 865.048575][ T1658] 3 locks held by kworker/1:1/34: [ 865.054915][ T1658] #0: ffff888020fb8938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 865.067469][ T1658] #1: ffffc90000dffda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 865.078406][ T1658] #2: ffffffff8ca5a248 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 865.088509][ T1658] 1 lock held by khungtaskd/1658: [ 865.094115][ T1658] #0: ffffffff8b3738a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 865.104653][ T1658] 1 lock held by in:imklog/8169: [ 865.110253][ T1658] #0: ffff88801835cd70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 865.120062][ T1658] 1 lock held by syz-executor410/8496: [ 865.125557][ T1658] [ 865.127882][ T1658] ============================================= [ 865.127882][ T1658] [ 865.138051][ T1658] NMI backtrace for cpu 0 [ 865.142541][ T1658] CPU: 0 PID: 1658 Comm: khungtaskd Not tainted 5.11.0-rc4-syzkaller #0 [ 865.150887][ T1658] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.160943][ T1658] Call Trace: [ 865.164222][ T1658] dump_stack+0x107/0x163 [ 865.168654][ T1658] nmi_cpu_backtrace.cold+0x44/0xd7 [ 865.173866][ T1658] ? lapic_can_unplug_cpu+0x80/0x80 [ 865.179149][ T1658] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 865.185264][ T1658] watchdog+0xd43/0xfa0 [ 865.189467][ T1658] ? reset_hung_task_detector+0x30/0x30 [ 865.195028][ T1658] kthread+0x3b1/0x4a0 [ 865.199105][ T1658] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 865.205017][ T1658] ret_from_fork+0x1f/0x30 [ 865.209627][ T1658] Sending NMI from CPU 0 to CPUs 1: [ 865.216340][ C1] NMI backtrace for cpu 1 [ 865.216349][ C1] CPU: 1 PID: 8496 Comm: syz-executor410 Not tainted 5.11.0-rc4-syzkaller #0 [ 865.216359][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.216367][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 [ 865.216378][ C1] Code: 81 e1 00 01 00 00 65 48 8b 14 25 00 f0 01 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 cc 14 00 00 85 c0 74 2b 8b 82 a8 14 00 00 <83> f8 02 75 20 48 8b 8a b0 14 00 00 8b 92 ac 14 00 00 48 8b 01 48 [ 865.216392][ C1] RSP: 0018:ffffc9000160ece8 EFLAGS: 00000246 [ 865.216405][ C1] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 865.216413][ C1] RDX: ffff888011ae0000 RSI: ffffffff83d91b14 RDI: 0000000000000003 [ 865.216421][ C1] RBP: dffffc0000000000 R08: 0000000000000002 R09: ffff888011f69407 [ 865.216429][ C1] R10: ffffffff83d91b05 R11: 0000000000000001 R12: ffff88801070db82 [ 865.216437][ C1] R13: 0000000000000002 R14: 0000000000000005 R15: ffff888011f694d8 [ 865.216446][ C1] FS: 00000000011e9880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 865.216454][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 865.216462][ C1] CR2: 00007f9c7c250000 CR3: 0000000010fd2000 CR4: 00000000001506e0 [ 865.216470][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 865.216478][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 865.216485][ C1] Call Trace: [ 865.216490][ C1] __radix_tree_lookup+0x114/0x2a0 [ 865.216495][ C1] tcf_idr_check_alloc+0xb0/0x3b0 [ 865.216501][ C1] tcf_police_init+0x34f/0x1460 [ 865.216506][ C1] ? tcf_police_cleanup+0x60/0x60 [ 865.216511][ C1] ? find_held_lock+0x2d/0x110 [ 865.216517][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 865.216522][ C1] ? stack_depot_save+0x23c/0x4e0 [ 865.216527][ C1] tcf_action_init_1+0x103/0x640 [ 865.216533][ C1] ? tc_action_load_ops+0x440/0x440 [ 865.216539][ C1] ? tcf_action_dump_old+0x80/0x80 [ 865.216544][ C1] ? kasan_save_stack+0x32/0x40 [ 865.216549][ C1] ? kasan_save_stack+0x32/0x40 [ 865.216555][ C1] ? kasan_save_stack+0x1b/0x40 [ 865.216560][ C1] ? ____kasan_kmalloc.constprop.0+0x82/0xa0 [ 865.216566][ C1] ? fw_change+0x4b5/0x13e0 [ 865.216571][ C1] ? tc_new_tfilter+0x1394/0x2120 [ 865.216577][ C1] ? rtnetlink_rcv_msg+0x80e/0xad0 [ 865.216582][ C1] ? netlink_unicast+0x533/0x7d0 [ 865.216588][ C1] ? netlink_sendmsg+0x856/0xd90 [ 865.216593][ C1] tcf_exts_validate+0x1d7/0x540 [ 865.216599][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 865.216604][ C1] fw_set_parms+0x13d/0xb50 [ 865.216609][ C1] ? fw_bind_class+0x2c0/0x2c0 [ 865.216620][ C1] ? unpoison_range+0x3a/0x60 [ 865.216625][ C1] fw_change+0x57e/0x13e0 [ 865.216630][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 865.216635][ C1] ? fw_set_parms+0xb50/0xb50 [ 865.216641][ C1] ? tc_new_tfilter+0x132a/0x2120 [ 865.216646][ C1] tc_new_tfilter+0x1394/0x2120 [ 865.216651][ C1] ? fw_set_parms+0xb50/0xb50 [ 865.216657][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 865.216662][ C1] ? lock_chain_count+0x20/0x20 [ 865.216667][ C1] ? kernel_text_address+0xbd/0xf0 [ 865.216673][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 865.216679][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 865.216684][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 865.216690][ C1] netlink_rcv_skb+0x153/0x420 [ 865.216695][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 865.216701][ C1] ? netlink_ack+0xaa0/0xaa0 [ 865.216706][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 865.216712][ C1] netlink_unicast+0x533/0x7d0 [ 865.216717][ C1] ? netlink_attachskb+0x870/0x870 [ 865.216723][ C1] ? _copy_from_iter_full+0x275/0x850 [ 865.216729][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 865.216735][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 865.216741][ C1] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 865.216747][ C1] ? __check_object_size+0x171/0x3f0 [ 865.216752][ C1] netlink_sendmsg+0x856/0xd90 [ 865.216757][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 865.216763][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 865.216769][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 865.216774][ C1] sock_sendmsg+0xcf/0x120 [ 865.216780][ C1] ____sys_sendmsg+0x331/0x810 [ 865.216785][ C1] ? kernel_sendmsg+0x50/0x50 [ 865.216790][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 865.216795][ C1] ? __lock_acquire+0x16c2/0x54f0 [ 865.216800][ C1] ___sys_sendmsg+0xf3/0x170 [ 865.216805][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 865.216811][ C1] ? find_held_lock+0x2d/0x110 [ 865.216816][ C1] ? __might_fault+0xd3/0x180 [ 865.216822][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 865.216827][ C1] __sys_sendmmsg+0x195/0x470 [ 865.216832][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 865.216838][ C1] ? find_held_lock+0x2d/0x110 [ 865.216842][ C1] ? alloc_file_pseudo+0x1/0x250 [ 865.216847][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 865.216852][ C1] ? fd_install+0x215/0x640 [ 865.216857][ C1] ? __sys_socket+0x16d/0x200 [ 865.216862][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 865.216866][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 865.216872][ C1] do_syscall_64+0x2d/0x70 [ 865.216876][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 865.216881][ C1] RIP: 0033:0x443869 [ 865.216889][ 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 [ 865.216902][ C1] RSP: 002b:00007fffd2b23c08 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 865.216913][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443869 [ 865.216920][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 865.216927][ C1] RBP: 00007fffd2b23c10 R08: 0000000120080522 R09: 0000000120080522 [ 865.216934][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a4bb0 [ 865.216942][ C1] R13: 0000000000404740 R14: 0000000000000000 R15: 0000000000000000 [ 865.216956][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.464 msecs [ 865.218027][ T1658] Kernel panic - not syncing: hung_task: blocked tasks [ 865.801151][ T1658] CPU: 0 PID: 1658 Comm: khungtaskd Not tainted 5.11.0-rc4-syzkaller #0 [ 865.809579][ T1658] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.819639][ T1658] Call Trace: [ 865.822932][ T1658] dump_stack+0x107/0x163 [ 865.827289][ T1658] panic+0x306/0x73d [ 865.831197][ T1658] ? __warn_printk+0xf3/0xf3 [ 865.835801][ T1658] ? lapic_can_unplug_cpu+0x80/0x80 [ 865.841008][ T1658] ? preempt_schedule_thunk+0x16/0x18 [ 865.846393][ T1658] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 865.852564][ T1658] ? watchdog.cold+0x5/0x158 [ 865.857297][ T1658] watchdog.cold+0x16/0x158 [ 865.861818][ T1658] ? reset_hung_task_detector+0x30/0x30 [ 865.867383][ T1658] kthread+0x3b1/0x4a0 [ 865.871459][ T1658] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 865.877366][ T1658] ret_from_fork+0x1f/0x30 [ 865.882704][ T1658] Kernel Offset: disabled [ 865.887039][ T1658] Rebooting in 86400 seconds..