[ 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 '10.128.0.59' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 486.342625][ T8469] IPVS: ftp: loaded support on port[0] = 21 [ 486.386638][ T8490] netlink: 1028 bytes leftover after parsing attributes in process `syz-executor103'. [ 486.397420][ T8490] netlink: 1028 bytes leftover after parsing attributes in process `syz-executor103'. [ 716.197838][ T1658] INFO: task kworker/0:0:8461 blocked for more than 143 seconds. [ 716.205756][ T1658] Not tainted 5.11.0-rc4-syzkaller #0 [ 716.214553][ T1658] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.224080][ T1658] task:kworker/0:0 state:D stack:29784 pid: 8461 ppid: 2 flags:0x00004000 [ 716.234133][ T1658] Workqueue: ipv6_addrconf addrconf_verify_work [ 716.241394][ T1658] Call Trace: [ 716.244737][ T1658] __schedule+0x90c/0x21a0 [ 716.250831][ T1658] ? io_schedule_timeout+0x140/0x140 [ 716.256147][ T1658] ? _raw_spin_unlock_irq+0x1f/0x40 [ 716.262595][ T1658] ? lockdep_hardirqs_on+0x79/0x100 [ 716.268573][ T1658] schedule+0xcf/0x270 [ 716.272665][ T1658] schedule_preempt_disabled+0xf/0x20 [ 716.279207][ T1658] __mutex_lock+0x81a/0x1110 [ 716.283825][ T1658] ? addrconf_verify_work+0xa/0x20 [ 716.290075][ T1658] ? mutex_lock_io_nested+0xf60/0xf60 [ 716.295481][ T1658] ? lock_release+0x710/0x710 [ 716.301481][ T1658] ? lock_downgrade+0x6d0/0x6d0 [ 716.306377][ T1658] addrconf_verify_work+0xa/0x20 [ 716.312470][ T1658] process_one_work+0x98d/0x15f0 [ 716.317497][ T1658] ? pwq_dec_nr_in_flight+0x320/0x320 [ 716.324108][ T1658] ? rwlock_bug.part.0+0x90/0x90 [ 716.329866][ T1658] ? _raw_spin_lock_irq+0x41/0x50 [ 716.334925][ T1658] worker_thread+0x64c/0x1120 [ 716.341973][ T1658] ? __kthread_parkme+0x13f/0x1e0 [ 716.347077][ T1658] ? process_one_work+0x15f0/0x15f0 [ 716.353578][ T1658] kthread+0x3b1/0x4a0 [ 716.358512][ T1658] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 716.364432][ T1658] ret_from_fork+0x1f/0x30 [ 716.370188][ T1658] [ 716.370188][ T1658] Showing all locks held in the system: [ 716.378790][ T1658] 1 lock held by khungtaskd/1658: [ 716.383825][ T1658] #0: ffffffff8b3738a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 716.395923][ T1658] 1 lock held by in:imklog/8165: [ 716.401695][ T1658] #0: ffff888020781770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 716.411766][ T1658] 3 locks held by kworker/0:0/8461: [ 716.416975][ T1658] #0: ffff888021065938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 716.429395][ T1658] #1: ffffc90000fdfda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 716.440527][ T1658] #2: ffffffff8ca5a248 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 716.450861][ T1658] 2 locks held by syz-executor103/8490: [ 716.456443][ T1658] [ 716.459929][ T1658] ============================================= [ 716.459929][ T1658] [ 716.470552][ T1658] NMI backtrace for cpu 0 [ 716.474888][ T1658] CPU: 0 PID: 1658 Comm: khungtaskd Not tainted 5.11.0-rc4-syzkaller #0 [ 716.483216][ T1658] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.493270][ T1658] Call Trace: [ 716.496550][ T1658] dump_stack+0x107/0x163 [ 716.500963][ T1658] nmi_cpu_backtrace.cold+0x44/0xd7 [ 716.506176][ T1658] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.511444][ T1658] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 716.517504][ T1658] watchdog+0xd43/0xfa0 [ 716.521699][ T1658] ? reset_hung_task_detector+0x30/0x30 [ 716.527274][ T1658] kthread+0x3b1/0x4a0 [ 716.531352][ T1658] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 716.537257][ T1658] ret_from_fork+0x1f/0x30 [ 716.541856][ T1658] Sending NMI from CPU 0 to CPUs 1: [ 716.548473][ C1] NMI backtrace for cpu 1 [ 716.548482][ C1] CPU: 1 PID: 8490 Comm: syz-executor103 Not tainted 5.11.0-rc4-syzkaller #0 [ 716.548492][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.548500][ C1] RIP: 0010:mark_lock+0xf2/0x1720 [ 716.548510][ C1] Code: 03 0f 8e 8f 07 00 00 44 0f b7 75 20 66 41 81 e6 ff 1f 45 0f b7 f6 be 08 00 00 00 4c 89 f0 48 c1 f8 06 48 8d 3c c5 a0 77 d3 8e 59 61 5d 00 4c 0f a3 35 11 2c 7b 0d 0f 83 04 01 00 00 4f 8d 34 [ 716.548525][ C1] RSP: 0018:ffffc9000169e920 EFLAGS: 00000007 [ 716.548537][ C1] RAX: 0000000000000018 RBX: 1ffff920002d3d2a RCX: 0000000000000008 [ 716.548545][ C1] RDX: 1ffff1100313bba2 RSI: 0000000000000008 RDI: ffffffff8ed37860 [ 716.548553][ C1] RBP: ffff8880189ddcf0 R08: 0000000000000000 R09: ffffffff8ed37867 [ 716.548562][ C1] R10: fffffbfff1da6f0c R11: 0000000000000001 R12: 0000000000000008 [ 716.548570][ C1] R13: 0000000000000100 R14: 000000000000063b R15: ffff8880189ddcc8 [ 716.548579][ C1] FS: 000000000200c880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 716.548587][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 716.548594][ C1] CR2: 00007fffdf5763c8 CR3: 000000001536e000 CR4: 00000000001506e0 [ 716.548603][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 716.548611][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 716.548618][ C1] Call Trace: [ 716.548622][ C1] ? mark_lock+0xf7/0x1720 [ 716.548627][ C1] ? lock_chain_count+0x20/0x20 [ 716.548633][ C1] ? lock_chain_count+0x20/0x20 [ 716.548638][ C1] __lock_acquire+0x8bf/0x54f0 [ 716.548643][ C1] ? lockdep_hardirqs_on+0x79/0x100 [ 716.548649][ C1] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 716.548655][ C1] lock_acquire+0x29d/0x740 [ 716.548660][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 716.548666][ C1] ? lock_release+0x710/0x710 [ 716.548671][ C1] __mutex_lock+0x134/0x1110 [ 716.548676][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 716.548682][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 716.548688][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 716.548694][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 716.548700][ C1] ? wait_for_completion_io+0x260/0x260 [ 716.548706][ C1] ? __radix_tree_lookup+0x211/0x2a0 [ 716.548712][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 716.548717][ C1] tcf_police_init+0x34f/0x1460 [ 716.548723][ C1] ? __kernel_text_address+0x9/0x30 [ 716.548728][ C1] ? tcf_police_cleanup+0x60/0x60 [ 716.548734][ C1] ? find_held_lock+0x2d/0x110 [ 716.548739][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 716.548744][ C1] ? stack_trace_consume_entry+0x160/0x160 [ 716.548750][ C1] tcf_action_init_1+0x103/0x640 [ 716.548756][ C1] ? tc_action_load_ops+0x440/0x440 [ 716.548762][ C1] ? tcf_action_dump_old+0x80/0x80 [ 716.548767][ C1] ? ___slab_alloc+0x148/0x790 [ 716.548773][ C1] ? find_held_lock+0x2d/0x110 [ 716.548778][ C1] tcf_exts_validate+0x1d7/0x540 [ 716.548783][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 716.548789][ C1] ? unpoison_range+0x3a/0x60 [ 716.548794][ C1] route4_change+0x6d8/0x24b0 [ 716.548799][ C1] ? tc_new_tfilter+0x1be1/0x2120 [ 716.548805][ C1] ? route4_delete+0xb70/0xb70 [ 716.548810][ C1] ? tc_new_tfilter+0x132a/0x2120 [ 716.548816][ C1] tc_new_tfilter+0x1394/0x2120 [ 716.548821][ C1] ? route4_delete+0xb70/0xb70 [ 716.548826][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 716.548832][ C1] ? lock_chain_count+0x20/0x20 [ 716.548838][ C1] ? kernel_text_address+0xbd/0xf0 [ 716.548843][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 716.548849][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 716.548854][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 716.548860][ C1] netlink_rcv_skb+0x153/0x420 [ 716.548866][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 716.548872][ C1] ? netlink_ack+0xaa0/0xaa0 [ 716.548877][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 716.548882][ C1] netlink_unicast+0x533/0x7d0 [ 716.548888][ C1] ? netlink_attachskb+0x870/0x870 [ 716.548894][ C1] ? _copy_from_iter_full+0x275/0x850 [ 716.548900][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 716.548906][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 716.548912][ C1] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 716.548918][ C1] ? __check_object_size+0x171/0x3f0 [ 716.548923][ C1] netlink_sendmsg+0x856/0xd90 [ 716.548929][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 716.548935][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 716.548941][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 716.548951][ C1] sock_sendmsg+0xcf/0x120 [ 716.548956][ C1] ____sys_sendmsg+0x331/0x810 [ 716.548961][ C1] ? kernel_sendmsg+0x50/0x50 [ 716.548966][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 716.548971][ C1] ? __lock_acquire+0x16c2/0x54f0 [ 716.548977][ C1] ___sys_sendmsg+0xf3/0x170 [ 716.548982][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 716.548988][ C1] ? find_held_lock+0x2d/0x110 [ 716.548993][ C1] ? __might_fault+0xd3/0x180 [ 716.548998][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 716.549004][ C1] __sys_sendmmsg+0x195/0x470 [ 716.549009][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 716.549015][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 716.549021][ C1] ? sockfd_lookup_light+0xc5/0x180 [ 716.549027][ C1] ? __sys_sendmsg+0x10c/0x1b0 [ 716.549032][ C1] ? __sys_sendmsg_sock+0xb0/0xb0 [ 716.549038][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 716.549044][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 716.549050][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 716.549056][ C1] do_syscall_64+0x2d/0x70 [ 716.549061][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 716.549067][ C1] RIP: 0033:0x441619 [ 716.549075][ 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 [ 716.549088][ C1] RSP: 002b:00007ffcfea731b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 716.549100][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441619 [ 716.549107][ C1] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 716.549114][ C1] RBP: 00007ffcfea731c0 R08: 0000000120080522 R09: 0000000120080522 [ 716.549121][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2990 [ 716.549129][ C1] R13: 00000000004024f0 R14: 0000000000000000 R15: 0000000000000000 [ 716.549136][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.371 msecs [ 716.567605][ T1658] Kernel panic - not syncing: hung_task: blocked tasks [ 717.171348][ T1658] CPU: 0 PID: 1658 Comm: khungtaskd Not tainted 5.11.0-rc4-syzkaller #0 [ 717.179685][ T1658] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.189742][ T1658] Call Trace: [ 717.193024][ T1658] dump_stack+0x107/0x163 [ 717.197456][ T1658] panic+0x306/0x73d [ 717.201364][ T1658] ? __warn_printk+0xf3/0xf3 [ 717.205965][ T1658] ? lapic_can_unplug_cpu+0x80/0x80 [ 717.211175][ T1658] ? preempt_schedule_thunk+0x16/0x18 [ 717.216558][ T1658] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 717.222729][ T1658] ? watchdog.cold+0x5/0x158 [ 717.227372][ T1658] watchdog.cold+0x16/0x158 [ 717.231895][ T1658] ? reset_hung_task_detector+0x30/0x30 [ 717.237456][ T1658] kthread+0x3b1/0x4a0 [ 717.241532][ T1658] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 717.247438][ T1658] ret_from_fork+0x1f/0x30 [ 717.252080][ T1658] Kernel Offset: disabled [ 717.256402][ T1658] Rebooting in 86400 seconds..