[ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.82' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 485.781812][ T8460] IPVS: ftp: loaded support on port[0] = 21 [ 721.467001][ T1649] INFO: task kworker/1:1:28 blocked for more than 143 seconds. [ 721.474733][ T1649] Not tainted 5.11.0-rc2-syzkaller #0 [ 721.482700][ T1649] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.492067][ T1649] task:kworker/1:1 state:D stack:27680 pid: 28 ppid: 2 flags:0x00004000 [ 721.503096][ T1649] Workqueue: ipv6_addrconf addrconf_verify_work [ 721.510155][ T1649] Call Trace: [ 721.513490][ T1649] __schedule+0x90c/0x21a0 [ 721.518942][ T1649] ? io_schedule_timeout+0x140/0x140 [ 721.524257][ T1649] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.530593][ T1649] ? lockdep_hardirqs_on+0x79/0x100 [ 721.535820][ T1649] schedule+0xcf/0x270 [ 721.540936][ T1649] schedule_preempt_disabled+0xf/0x20 [ 721.546327][ T1649] __mutex_lock+0x81a/0x1110 [ 721.551962][ T1649] ? addrconf_verify_work+0xa/0x20 [ 721.557743][ T1649] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.563146][ T1649] ? lock_release+0x710/0x710 [ 721.568995][ T1649] ? lock_downgrade+0x6d0/0x6d0 [ 721.573899][ T1649] addrconf_verify_work+0xa/0x20 [ 721.580192][ T1649] process_one_work+0x98d/0x15f0 [ 721.585215][ T1649] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.591661][ T1649] ? rwlock_bug.part.0+0x90/0x90 [ 721.596623][ T1649] ? _raw_spin_lock_irq+0x41/0x50 [ 721.602624][ T1649] worker_thread+0x64c/0x1120 [ 721.607953][ T1649] ? __kthread_parkme+0x13f/0x1e0 [ 721.613040][ T1649] ? process_one_work+0x15f0/0x15f0 [ 721.619208][ T1649] kthread+0x3b1/0x4a0 [ 721.623339][ T1649] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.631441][ T1649] ret_from_fork+0x1f/0x30 [ 721.636090][ T1649] [ 721.636090][ T1649] Showing all locks held in the system: [ 721.644817][ T1649] 3 locks held by kworker/1:1/28: [ 721.650982][ T1649] #0: ffff888021025138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 721.662642][ T1649] #1: ffffc90000e3fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 721.673569][ T1649] #2: ffffffff8ca58628 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 721.683651][ T1649] 1 lock held by khungtaskd/1649: [ 721.689263][ T1649] #0: ffffffff8b373a60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.699791][ T1649] 1 lock held by in:imklog/8161: [ 721.704735][ T1649] #0: ffff8880178d1c70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.715107][ T1649] 2 locks held by syz-executor843/8483: [ 721.721575][ T1649] [ 721.723910][ T1649] ============================================= [ 721.723910][ T1649] [ 721.733533][ T1649] NMI backtrace for cpu 0 [ 721.737948][ T1649] CPU: 0 PID: 1649 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 721.746278][ T1649] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.756333][ T1649] Call Trace: [ 721.759633][ T1649] dump_stack+0x107/0x163 [ 721.764022][ T1649] nmi_cpu_backtrace.cold+0x44/0xd7 [ 721.769231][ T1649] ? lapic_can_unplug_cpu+0x80/0x80 [ 721.774509][ T1649] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 721.780565][ T1649] watchdog+0xd43/0xfa0 [ 721.784759][ T1649] ? reset_hung_task_detector+0x30/0x30 [ 721.790324][ T1649] kthread+0x3b1/0x4a0 [ 721.794407][ T1649] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.800310][ T1649] ret_from_fork+0x1f/0x30 [ 721.804889][ T1649] Sending NMI from CPU 0 to CPUs 1: [ 721.811566][ C1] NMI backtrace for cpu 1 [ 721.811575][ C1] CPU: 1 PID: 8483 Comm: syz-executor843 Not tainted 5.11.0-rc2-syzkaller #0 [ 721.811585][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.811595][ C1] RIP: 0010:mark_lock+0xff/0x1720 [ 721.811605][ C1] Code: 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 07 d3 8e e8 a9 3f 5d 00 4c 0f a3 35 61 bf 7a 0d <0f> 83 04 01 00 00 4f 8d 34 76 49 c1 e6 06 49 81 c6 c0 0b d3 8e 49 [ 721.811621][ C1] RSP: 0018:ffffc9000111ea68 EFLAGS: 00000047 [ 721.811633][ C1] RAX: 0000000000000001 RBX: 1ffff92000223d53 RCX: ffffffff81584837 [ 721.811642][ C1] RDX: fffffbfff1da610d RSI: 0000000000000008 RDI: ffffffff8ed30860 [ 721.811651][ C1] RBP: ffff8880203209b0 R08: 0000000000000000 R09: ffffffff8ed30867 [ 721.811659][ C1] R10: fffffbfff1da610c R11: 0000000000000001 R12: 0000000000000008 [ 721.811668][ C1] R13: 0000000000000100 R14: 000000000000063d R15: ffff888020320988 [ 721.811677][ C1] FS: 0000000002245880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 721.811686][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 721.811694][ C1] CR2: 00007ffe82f45d10 CR3: 0000000012045000 CR4: 00000000001506e0 [ 721.811702][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 721.811711][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 721.811718][ C1] Call Trace: [ 721.811722][ C1] ? mark_lock+0xf7/0x1720 [ 721.811727][ C1] ? lock_chain_count+0x20/0x20 [ 721.811733][ C1] ? lock_chain_count+0x20/0x20 [ 721.811738][ C1] __lock_acquire+0x8bf/0x54f0 [ 721.811744][ C1] ? lockdep_hardirqs_on+0x79/0x100 [ 721.811750][ C1] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 721.811756][ C1] lock_acquire+0x29d/0x740 [ 721.811761][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.811767][ C1] ? lock_release+0x710/0x710 [ 721.811772][ C1] __mutex_lock+0x134/0x1110 [ 721.811778][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.811783][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.811789][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.811795][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 721.811801][ C1] ? __radix_tree_lookup+0x14e/0x2a0 [ 721.811807][ C1] ? wait_for_completion_io+0x260/0x260 [ 721.811813][ C1] ? __radix_tree_lookup+0x211/0x2a0 [ 721.811819][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 721.811825][ C1] tcf_police_init+0x34f/0x1460 [ 721.811830][ C1] ? tcf_police_cleanup+0x60/0x60 [ 721.811836][ C1] ? find_held_lock+0x2d/0x110 [ 721.811841][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 721.811847][ C1] tcf_action_init_1+0x1a3/0x990 [ 721.811853][ C1] ? tcf_action_dump_old+0x80/0x80 [ 721.811858][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.811864][ C1] ? find_held_lock+0x2d/0x110 [ 721.811869][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 721.811882][ C1] ? wait_for_completion_io+0x260/0x260 [ 721.811888][ C1] tcf_exts_validate+0x138/0x420 [ 721.811893][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 721.811899][ C1] basic_change+0x47a/0x1310 [ 721.811904][ C1] ? basic_delete+0x680/0x680 [ 721.811909][ C1] tc_new_tfilter+0x1394/0x2120 [ 721.811915][ C1] ? basic_delete+0x680/0x680 [ 721.811920][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.811926][ C1] ? lock_chain_count+0x20/0x20 [ 721.811931][ C1] ? kernel_text_address+0xbd/0xf0 [ 721.811937][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.811943][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 721.811948][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.811954][ C1] netlink_rcv_skb+0x153/0x420 [ 721.811960][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.811965][ C1] ? netlink_ack+0xaa0/0xaa0 [ 721.811971][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 721.811977][ C1] netlink_unicast+0x533/0x7d0 [ 721.811982][ C1] ? netlink_attachskb+0x870/0x870 [ 721.811988][ C1] ? _copy_from_iter_full+0x275/0x850 [ 721.811994][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.812001][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 721.812006][ C1] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 721.812013][ C1] ? __check_object_size+0x171/0x3f0 [ 721.812018][ C1] netlink_sendmsg+0x856/0xd90 [ 721.812024][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.812030][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.812036][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.812042][ C1] sock_sendmsg+0xcf/0x120 [ 721.812047][ C1] ____sys_sendmsg+0x6e8/0x810 [ 721.812052][ C1] ? kernel_sendmsg+0x50/0x50 [ 721.812057][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 721.812063][ C1] ? rcu_read_lock_sched_held+0x3a/0x70 [ 721.812068][ C1] ? kfree+0x2ec/0x3b0 [ 721.812073][ C1] ___sys_sendmsg+0xf3/0x170 [ 721.812079][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 721.812084][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.812090][ C1] ? _copy_to_user+0xdc/0x150 [ 721.812096][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.812102][ C1] ? move_addr_to_user+0xad/0x1e0 [ 721.812108][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.812114][ C1] ? __fget_light+0x215/0x280 [ 721.812120][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.812127][ C1] __sys_sendmsg+0xe5/0x1b0 [ 721.812132][ C1] ? __sys_sendmsg_sock+0xb0/0xb0 [ 721.812138][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.812145][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.812151][ C1] do_syscall_64+0x2d/0x70 [ 721.812156][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.812162][ C1] RIP: 0033:0x441829 [ 721.812172][ 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 [ 721.812188][ C1] RSP: 002b:00007ffe82f45d08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 721.812201][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441829 [ 721.812210][ C1] RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003 [ 721.812218][ C1] RBP: 00007ffe82f45d10 R08: 0000000100000000 R09: 0000000100000000 [ 721.812225][ C1] R10: 0000000100000000 R11: 0000000000000246 R12: 00000000000769e1 [ 721.812233][ C1] R13: 0000000000402700 R14: 0000000000000000 R15: 0000000000000000 [ 721.812241][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.322 msecs [ 721.850833][ T1649] Kernel panic - not syncing: hung_task: blocked tasks [ 722.427061][ T1649] CPU: 0 PID: 1649 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 722.435737][ T1649] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 722.445791][ T1649] Call Trace: [ 722.449073][ T1649] dump_stack+0x107/0x163 [ 722.453414][ T1649] panic+0x306/0x73d [ 722.457350][ T1649] ? __warn_printk+0xf3/0xf3 [ 722.461954][ T1649] ? lapic_can_unplug_cpu+0x80/0x80 [ 722.467160][ T1649] ? preempt_schedule_thunk+0x16/0x18 [ 722.472541][ T1649] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 722.478707][ T1649] ? watchdog.cold+0x5/0x158 [ 722.483323][ T1649] watchdog.cold+0x16/0x158 [ 722.487841][ T1649] ? reset_hung_task_detector+0x30/0x30 [ 722.493399][ T1649] kthread+0x3b1/0x4a0 [ 722.497492][ T1649] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 722.503396][ T1649] ret_from_fork+0x1f/0x30 [ 722.508589][ T1649] Kernel Offset: disabled [ 722.512916][ T1649] Rebooting in 86400 seconds..