[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.136' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 610.741411][ T8493] IPVS: ftp: loaded support on port[0] = 21 [ 864.752930][ T1641] INFO: task kworker/0:0:8485 blocked for more than 143 seconds. [ 864.760824][ T1641] Not tainted 5.11.0-rc3-syzkaller #0 [ 864.769287][ T1641] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 864.778789][ T1641] task:kworker/0:0 state:D stack:29232 pid: 8485 ppid: 2 flags:0x00004000 [ 864.788883][ T1641] Workqueue: ipv6_addrconf addrconf_verify_work [ 864.796144][ T1641] Call Trace: [ 864.799489][ T1641] __schedule+0x90c/0x21a0 [ 864.805689][ T1641] ? io_schedule_timeout+0x140/0x140 [ 864.811002][ T1641] ? _raw_spin_unlock_irq+0x1f/0x40 [ 864.817527][ T1641] ? lockdep_hardirqs_on+0x79/0x100 [ 864.823668][ T1641] schedule+0xcf/0x270 [ 864.827763][ T1641] schedule_preempt_disabled+0xf/0x20 [ 864.834615][ T1641] __mutex_lock+0x81a/0x1110 [ 864.839229][ T1641] ? addrconf_verify_work+0xa/0x20 [ 864.845598][ T1641] ? mutex_lock_io_nested+0xf60/0xf60 [ 864.851107][ T1641] ? lock_release+0x710/0x710 [ 864.857197][ T1641] ? lock_downgrade+0x6d0/0x6d0 [ 864.862097][ T1641] addrconf_verify_work+0xa/0x20 [ 864.868539][ T1641] process_one_work+0x98d/0x15f0 [ 864.874460][ T1641] ? pwq_dec_nr_in_flight+0x320/0x320 [ 864.879877][ T1641] ? rwlock_bug.part.0+0x90/0x90 [ 864.886059][ T1641] ? _raw_spin_lock_irq+0x41/0x50 [ 864.891120][ T1641] worker_thread+0x64c/0x1120 [ 864.897088][ T1641] ? __kthread_parkme+0x13f/0x1e0 [ 864.902191][ T1641] ? process_one_work+0x15f0/0x15f0 [ 864.908720][ T1641] kthread+0x3b1/0x4a0 [ 864.913717][ T1641] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 864.919639][ T1641] ret_from_fork+0x1f/0x30 [ 864.925430][ T1641] [ 864.925430][ T1641] Showing all locks held in the system: [ 864.934062][ T1641] 1 lock held by khungtaskd/1641: [ 864.939098][ T1641] #0: ffffffff8b373920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 864.950369][ T1641] 1 lock held by in:imklog/8225: [ 864.956132][ T1641] #0: ffff888016696d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 864.966248][ T1641] 3 locks held by kworker/0:0/8485: [ 864.971458][ T1641] #0: ffff888147364938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 864.984754][ T1641] #1: ffffc90001b5fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 864.996058][ T1641] #2: ffffffff8ca58668 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 865.006498][ T1641] 1 lock held by syz-executor263/8516: [ 865.011993][ T1641] [ 865.015631][ T1641] ============================================= [ 865.015631][ T1641] [ 865.025217][ T1641] NMI backtrace for cpu 1 [ 865.029566][ T1641] CPU: 1 PID: 1641 Comm: khungtaskd Not tainted 5.11.0-rc3-syzkaller #0 [ 865.037898][ T1641] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.047967][ T1641] Call Trace: [ 865.051253][ T1641] dump_stack+0x107/0x163 [ 865.055670][ T1641] nmi_cpu_backtrace.cold+0x44/0xd7 [ 865.060882][ T1641] ? lapic_can_unplug_cpu+0x80/0x80 [ 865.066158][ T1641] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 865.072205][ T1641] watchdog+0xd43/0xfa0 [ 865.076419][ T1641] ? reset_hung_task_detector+0x30/0x30 [ 865.081986][ T1641] kthread+0x3b1/0x4a0 [ 865.086063][ T1641] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 865.091971][ T1641] ret_from_fork+0x1f/0x30 [ 865.096626][ T1641] Sending NMI from CPU 1 to CPUs 0: [ 865.103621][ C0] NMI backtrace for cpu 0 [ 865.103632][ C0] CPU: 0 PID: 8516 Comm: syz-executor263 Not tainted 5.11.0-rc3-syzkaller #0 [ 865.103642][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.103652][ C0] RIP: 0010:__lock_acquire+0x4af/0x54f0 [ 865.103663][ C0] Code: 0f 83 36 0c 00 00 4b 8d 04 7f 48 c1 e0 06 48 05 c0 0b d3 8e 48 ba 00 00 00 00 00 fc ff df 48 8b 0c 24 48 c1 e9 03 0f b6 14 11 <84> d2 74 09 80 fa 03 0f 8e 64 10 00 00 8b b5 80 09 00 00 85 f6 0f [ 865.103679][ C0] RSP: 0018:ffffc9000158ea58 EFLAGS: 00000802 [ 865.103693][ C0] RAX: ffffffff8ed7ba40 RBX: 0000000000000001 RCX: 1ffff110042c0820 [ 865.103702][ C0] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8ed30860 [ 865.103711][ C0] RBP: ffff888021603780 R08: 0000000000000000 R09: ffffffff8ed30867 [ 865.103720][ C0] R10: fffffbfff1da610c R11: 0000000000000000 R12: ffff888021604130 [ 865.103729][ C0] R13: 0000000000000003 R14: ffff88801d1b0268 R15: 000000000000063e [ 865.103738][ C0] FS: 0000000001cd6880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 865.103747][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 865.103755][ C0] CR2: 00000000006ce080 CR3: 0000000010cf0000 CR4: 00000000001506f0 [ 865.103764][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 865.103773][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 865.103781][ C0] Call Trace: [ 865.103786][ C0] ? lockdep_hardirqs_on+0x79/0x100 [ 865.103792][ C0] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 865.103799][ C0] lock_acquire+0x29d/0x740 [ 865.103805][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 865.103811][ C0] ? lock_release+0x710/0x710 [ 865.103817][ C0] ? preempt_schedule_notrace_thunk+0x16/0x31 [ 865.103824][ C0] __mutex_lock+0x134/0x1110 [ 865.103830][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 865.103837][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 865.103843][ C0] ? mutex_lock_io_nested+0xf60/0xf60 [ 865.103850][ C0] ? __mutex_unlock_slowpath+0xe2/0x610 [ 865.103858][ C0] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 865.103866][ C0] ? wait_for_completion_io+0x260/0x260 [ 865.103873][ C0] ? __radix_tree_lookup+0x211/0x2a0 [ 865.103880][ C0] tcf_idr_check_alloc+0x78/0x3b0 [ 865.103886][ C0] tcf_police_init+0x34f/0x1460 [ 865.103893][ C0] ? tcf_police_cleanup+0x60/0x60 [ 865.103900][ C0] ? find_held_lock+0x2d/0x110 [ 865.103906][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 865.103913][ C0] ? stack_trace_save+0x8c/0xc0 [ 865.103920][ C0] tcf_action_init_1+0x1a3/0x990 [ 865.103926][ C0] ? tcf_action_dump_old+0x80/0x80 [ 865.103933][ C0] ? ____sys_sendmsg+0x331/0x810 [ 865.103940][ C0] ? ___sys_sendmsg+0xf3/0x170 [ 865.103946][ C0] ? __sys_sendmmsg+0x195/0x470 [ 865.103953][ C0] ? __x64_sys_sendmmsg+0x99/0x100 [ 865.103960][ C0] ? do_syscall_64+0x2d/0x70 [ 865.103966][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 865.103974][ C0] ? find_held_lock+0x2d/0x110 [ 865.103989][ C0] tcf_exts_validate+0x138/0x420 [ 865.103996][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 865.104002][ C0] ? unpoison_range+0x3a/0x60 [ 865.104009][ C0] route4_change+0x6d8/0x2380 [ 865.104015][ C0] ? tc_new_tfilter+0x1af1/0x2120 [ 865.104022][ C0] ? route4_delete+0xb70/0xb70 [ 865.104028][ C0] ? tc_new_tfilter+0x132a/0x2120 [ 865.104035][ C0] tc_new_tfilter+0x1394/0x2120 [ 865.104042][ C0] ? route4_delete+0xb70/0xb70 [ 865.104048][ C0] ? tc_del_tfilter+0x15b0/0x15b0 [ 865.104055][ C0] ? lock_chain_count+0x20/0x20 [ 865.104061][ C0] ? kernel_text_address+0xbd/0xf0 [ 865.104068][ C0] ? tc_del_tfilter+0x15b0/0x15b0 [ 865.104075][ C0] rtnetlink_rcv_msg+0x80e/0xad0 [ 865.104081][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 865.104086][ C0] netlink_rcv_skb+0x153/0x420 [ 865.104092][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 865.104096][ C0] ? netlink_ack+0xaa0/0xaa0 [ 865.104099][ C0] ? netlink_deliver_tap+0x227/0xb70 [ 865.104103][ C0] netlink_unicast+0x533/0x7d0 [ 865.104106][ C0] ? netlink_attachskb+0x870/0x870 [ 865.104110][ C0] ? _copy_from_iter_full+0x275/0x850 [ 865.104114][ C0] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 865.104118][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 865.104122][ C0] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 865.104125][ C0] ? __check_object_size+0x171/0x3f0 [ 865.104129][ C0] netlink_sendmsg+0x856/0xd90 [ 865.104132][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 865.104136][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 865.104140][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 865.104143][ C0] sock_sendmsg+0xcf/0x120 [ 865.104146][ C0] ____sys_sendmsg+0x331/0x810 [ 865.104150][ C0] ? kernel_sendmsg+0x50/0x50 [ 865.104153][ C0] ? do_recvmmsg+0x6c0/0x6c0 [ 865.104156][ C0] ? __lock_acquire+0x16c2/0x54f0 [ 865.104160][ C0] ___sys_sendmsg+0xf3/0x170 [ 865.104163][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 865.104167][ C0] ? find_held_lock+0x2d/0x110 [ 865.104170][ C0] ? __might_fault+0xd3/0x180 [ 865.104174][ C0] ? lock_downgrade+0x6d0/0x6d0 [ 865.104177][ C0] __sys_sendmmsg+0x195/0x470 [ 865.104181][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 865.104184][ C0] ? find_held_lock+0x2d/0x110 [ 865.104187][ C0] ? alloc_file_pseudo+0x1/0x250 [ 865.104191][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 865.104195][ C0] ? fd_install+0x215/0x640 [ 865.104198][ C0] ? __sys_socket+0x16d/0x200 [ 865.104202][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 865.104205][ C0] ? syscall_enter_from_user_mode+0x1d/0x50 [ 865.104209][ C0] do_syscall_64+0x2d/0x70 [ 865.104212][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 865.104216][ C0] RIP: 0033:0x442429 [ 865.104222][ 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 [ 865.104231][ C0] RSP: 002b:00007ffe61199908 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 865.104240][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442429 [ 865.104245][ C0] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 865.104251][ C0] RBP: 00007ffe61199910 R08: 0000000100000000 R09: 0000000100000000 [ 865.104256][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000951e3 [ 865.104261][ C0] R13: 0000000000403300 R14: 0000000000000000 R15: 0000000000000000 [ 865.104267][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.737 msecs [ 865.122777][ T1641] Kernel panic - not syncing: hung_task: blocked tasks [ 865.732809][ T1641] CPU: 1 PID: 1641 Comm: khungtaskd Not tainted 5.11.0-rc3-syzkaller #0 [ 865.741149][ T1641] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.751213][ T1641] Call Trace: [ 865.754506][ T1641] dump_stack+0x107/0x163 [ 865.758858][ T1641] panic+0x306/0x73d [ 865.762768][ T1641] ? __warn_printk+0xf3/0xf3 [ 865.767376][ T1641] ? lapic_can_unplug_cpu+0x80/0x80 [ 865.772592][ T1641] ? preempt_schedule_thunk+0x16/0x18 [ 865.777986][ T1641] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 865.784162][ T1641] ? watchdog.cold+0x5/0x158 [ 865.788816][ T1641] watchdog.cold+0x16/0x158 [ 865.793345][ T1641] ? reset_hung_task_detector+0x30/0x30 [ 865.798911][ T1641] kthread+0x3b1/0x4a0 [ 865.802993][ T1641] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 865.808904][ T1641] ret_from_fork+0x1f/0x30 [ 865.813960][ T1641] Kernel Offset: disabled [ 865.818320][ T1641] Rebooting in 86400 seconds..