[ 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 '10.128.0.209' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 486.629310][ T8497] IPVS: ftp: loaded support on port[0] = 21 [ 721.391345][ T1646] INFO: task kworker/u4:2:51 blocked for more than 143 seconds. [ 721.399209][ T1646] Not tainted 5.11.0-rc2-syzkaller #0 [ 721.408566][ T1646] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.418093][ T1646] task:kworker/u4:2 state:D stack:23600 pid: 51 ppid: 2 flags:0x00004000 [ 721.428221][ T1646] Workqueue: tc_filter_workqueue tcindex_partial_destroy_work [ 721.436690][ T1646] Call Trace: [ 721.439991][ T1646] __schedule+0x90c/0x21a0 [ 721.445677][ T1646] ? io_schedule_timeout+0x140/0x140 [ 721.450997][ T1646] schedule+0xcf/0x270 [ 721.456362][ T1646] schedule_preempt_disabled+0xf/0x20 [ 721.462669][ T1646] __mutex_lock+0x81a/0x1110 [ 721.467285][ T1646] ? tcindex_partial_destroy_work+0x13/0x50 [ 721.474446][ T1646] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.479855][ T1646] ? lock_release+0x710/0x710 [ 721.487048][ T1646] tcindex_partial_destroy_work+0x13/0x50 [ 721.493722][ T1646] process_one_work+0x98d/0x15f0 [ 721.498766][ T1646] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.505366][ T1646] ? rwlock_bug.part.0+0x90/0x90 [ 721.510332][ T1646] ? _raw_spin_lock_irq+0x41/0x50 [ 721.516714][ T1646] worker_thread+0x64c/0x1120 [ 721.522262][ T1646] ? __kthread_parkme+0x13f/0x1e0 [ 721.527368][ T1646] ? process_one_work+0x15f0/0x15f0 [ 721.533875][ T1646] kthread+0x3b1/0x4a0 [ 721.537966][ T1646] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.545091][ T1646] ret_from_fork+0x1f/0x30 [ 721.549730][ T1646] INFO: task kworker/0:1:8489 blocked for more than 143 seconds. [ 721.558796][ T1646] Not tainted 5.11.0-rc2-syzkaller #0 [ 721.565737][ T1646] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.575671][ T1646] task:kworker/0:1 state:D stack:29776 pid: 8489 ppid: 2 flags:0x00004000 [ 721.585871][ T1646] Workqueue: ipv6_addrconf addrconf_verify_work [ 721.593089][ T1646] Call Trace: [ 721.596388][ T1646] __schedule+0x90c/0x21a0 [ 721.600822][ T1646] ? io_schedule_timeout+0x140/0x140 [ 721.607817][ T1646] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.615187][ T1646] ? lockdep_hardirqs_on+0x79/0x100 [ 721.620416][ T1646] schedule+0xcf/0x270 [ 721.626003][ T1646] schedule_preempt_disabled+0xf/0x20 [ 721.632316][ T1646] __mutex_lock+0x81a/0x1110 [ 721.636934][ T1646] ? addrconf_verify_work+0xa/0x20 [ 721.643399][ T1646] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.648806][ T1646] ? lock_release+0x710/0x710 [ 721.654746][ T1646] ? lock_downgrade+0x6d0/0x6d0 [ 721.659643][ T1646] addrconf_verify_work+0xa/0x20 [ 721.666018][ T1646] process_one_work+0x98d/0x15f0 [ 721.671018][ T1646] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.677838][ T1646] ? rwlock_bug.part.0+0x90/0x90 [ 721.683577][ T1646] ? _raw_spin_lock_irq+0x41/0x50 [ 721.688639][ T1646] worker_thread+0x64c/0x1120 [ 721.694567][ T1646] ? __kthread_parkme+0x13f/0x1e0 [ 721.699612][ T1646] ? process_one_work+0x15f0/0x15f0 [ 721.706008][ T1646] kthread+0x3b1/0x4a0 [ 721.710098][ T1646] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.717284][ T1646] ret_from_fork+0x1f/0x30 [ 721.722560][ T1646] [ 721.722560][ T1646] Showing all locks held in the system: [ 721.730299][ T1646] 3 locks held by kworker/u4:2/51: [ 721.736697][ T1646] #0: ffff88814177a938 ((wq_completion)tc_filter_workqueue){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 721.750283][ T1646] #1: ffffc90000f0fda8 ((work_completion)(&(rwork)->work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 721.762561][ T1646] #2: ffffffff8c9463e8 (rtnl_mutex){+.+.}-{3:3}, at: tcindex_partial_destroy_work+0x13/0x50 [ 721.773773][ T1646] 1 lock held by khungtaskd/1646: [ 721.778807][ T1646] #0: ffffffff8b363820 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.789993][ T1646] 1 lock held by in:imklog/8203: [ 721.795719][ T1646] #0: ffff888023aa8d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.805815][ T1646] 3 locks held by kworker/0:1/8489: [ 721.811023][ T1646] #0: ffff8881478b0d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 721.823365][ T1646] #1: ffffc9000c817da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 721.834511][ T1646] #2: ffffffff8c9463e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 721.844796][ T1646] 1 lock held by syz-executor879/8519: [ 721.850297][ T1646] [ 721.854474][ T1646] ============================================= [ 721.854474][ T1646] [ 721.863696][ T1646] NMI backtrace for cpu 1 [ 721.868034][ T1646] CPU: 1 PID: 1646 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 721.876363][ T1646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.886421][ T1646] Call Trace: [ 721.889734][ T1646] dump_stack+0x107/0x163 [ 721.894160][ T1646] nmi_cpu_backtrace.cold+0x44/0xd7 [ 721.899372][ T1646] ? lapic_can_unplug_cpu+0x80/0x80 [ 721.904634][ T1646] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 721.910667][ T1646] watchdog+0xd43/0xfa0 [ 721.914862][ T1646] ? reset_hung_task_detector+0x30/0x30 [ 721.920438][ T1646] kthread+0x3b1/0x4a0 [ 721.924511][ T1646] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.930413][ T1646] ret_from_fork+0x1f/0x30 [ 721.935121][ T1646] Sending NMI from CPU 1 to CPUs 0: [ 721.941984][ C0] NMI backtrace for cpu 0 [ 721.941994][ C0] CPU: 0 PID: 8519 Comm: syz-executor879 Not tainted 5.11.0-rc2-syzkaller #0 [ 721.942004][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.942014][ C0] RIP: 0010:rcu_read_lock_sched_held+0x25/0x70 [ 721.942025][ C0] Code: 00 00 00 00 00 41 54 41 bc 01 00 00 00 e8 53 44 8d 07 85 c0 75 06 44 89 e0 41 5c c3 e8 b4 72 00 00 84 c0 74 41 e8 db 87 00 00 <84> c0 74 38 be ff ff ff ff 48 c7 c7 60 37 36 8b e8 e6 42 8d 07 85 [ 721.942040][ C0] RSP: 0018:ffffc9000182ead0 EFLAGS: 00000282 [ 721.942054][ C0] RAX: 0000000000000001 RBX: 1ffff92000305d5e RCX: ffffffff81588dc8 [ 721.942063][ C0] RDX: 1ffffffff166d72e RSI: 0000000000000003 RDI: ffffffff8b36b970 [ 721.942072][ C0] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8cef548f [ 721.942080][ C0] R10: fffffbfff19dea91 R11: 0000000000000000 R12: 0000000000000001 [ 721.942089][ C0] R13: ffff888014351668 R14: 0000000000000000 R15: 0000000000000000 [ 721.942098][ C0] FS: 0000000001508880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 721.942107][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 721.942115][ C0] CR2: 00007fff69f09500 CR3: 000000002994c000 CR4: 00000000001506f0 [ 721.942123][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 721.942132][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 721.942139][ C0] Call Trace: [ 721.942144][ C0] lock_acquire+0x5c9/0x740 [ 721.942150][ C0] ? lock_release+0x710/0x710 [ 721.942156][ C0] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 721.942163][ C0] __mutex_lock+0x134/0x1110 [ 721.942168][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.942175][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.942181][ C0] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.942187][ C0] ? __mutex_unlock_slowpath+0xe2/0x610 [ 721.942194][ C0] ? wait_for_completion_io+0x260/0x260 [ 721.942200][ C0] tcf_idr_check_alloc+0x78/0x3b0 [ 721.942206][ C0] tcf_police_init+0x347/0x13a0 [ 721.942212][ C0] ? tcf_police_cleanup+0x60/0x60 [ 721.942218][ C0] ? find_held_lock+0x2d/0x110 [ 721.942224][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 721.942230][ C0] ? stack_trace_save+0x8c/0xc0 [ 721.942236][ C0] tcf_action_init_1+0x1a3/0x990 [ 721.942241][ C0] ? tcf_action_dump_old+0x80/0x80 [ 721.942247][ C0] ? sock_sendmsg+0xcf/0x120 [ 721.942253][ C0] ? ____sys_sendmsg+0x6e8/0x810 [ 721.942259][ C0] ? ___sys_sendmsg+0xf3/0x170 [ 721.942265][ C0] ? __sys_sendmsg+0xe5/0x1b0 [ 721.942270][ C0] ? do_syscall_64+0x2d/0x70 [ 721.942276][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.942283][ C0] ? find_held_lock+0x2d/0x110 [ 721.942289][ C0] tcf_exts_validate+0x138/0x420 [ 721.942295][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 721.942300][ C0] ? unpoison_range+0x3a/0x60 [ 721.942306][ C0] tcindex_set_parms+0x189/0x20d0 [ 721.942312][ C0] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 721.942319][ C0] ? tcindex_alloc_perfect_hash+0x440/0x440 [ 721.942326][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.942333][ C0] ? __nla_validate_parse+0x2d3/0x2ae0 [ 721.942340][ C0] ? nla_get_range_signed+0x520/0x520 [ 721.942346][ C0] ? find_held_lock+0x2d/0x110 [ 721.942352][ C0] ? tcindex_change+0x1b7/0x320 [ 721.942359][ C0] tcindex_change+0x212/0x320 [ 721.942365][ C0] ? tcindex_set_parms+0x20d0/0x20d0 [ 721.942371][ C0] tc_new_tfilter+0x1394/0x2120 [ 721.942378][ C0] ? tcindex_set_parms+0x20d0/0x20d0 [ 721.942385][ C0] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.942391][ C0] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.942403][ C0] rtnetlink_rcv_msg+0x80e/0xad0 [ 721.942410][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 721.942416][ C0] netlink_rcv_skb+0x153/0x420 [ 721.942423][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 721.942429][ C0] ? netlink_ack+0xaa0/0xaa0 [ 721.942436][ C0] ? netlink_deliver_tap+0x227/0xb70 [ 721.942442][ C0] netlink_unicast+0x533/0x7d0 [ 721.942449][ C0] ? netlink_attachskb+0x870/0x870 [ 721.942455][ C0] ? _copy_from_iter_full+0x275/0x850 [ 721.942462][ C0] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.942470][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 721.942477][ C0] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 721.942484][ C0] ? __check_object_size+0x171/0x3f0 [ 721.942490][ C0] netlink_sendmsg+0x856/0xd90 [ 721.942496][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 721.942503][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.942511][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 721.942517][ C0] sock_sendmsg+0xcf/0x120 [ 721.942523][ C0] ____sys_sendmsg+0x6e8/0x810 [ 721.942529][ C0] ? kernel_sendmsg+0x50/0x50 [ 721.942535][ C0] ? do_recvmmsg+0x6c0/0x6c0 [ 721.942541][ C0] ? rcu_read_lock_sched_held+0x3a/0x70 [ 721.942548][ C0] ? kfree+0x2d3/0x360 [ 721.942554][ C0] ___sys_sendmsg+0xf3/0x170 [ 721.942560][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 721.942567][ C0] ? lock_downgrade+0x6d0/0x6d0 [ 721.942572][ C0] ? _copy_to_user+0xdc/0x150 [ 721.942578][ C0] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.942584][ C0] ? move_addr_to_user+0xad/0x1e0 [ 721.942589][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.942593][ C0] ? __fget_light+0x215/0x280 [ 721.942596][ C0] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.942600][ C0] __sys_sendmsg+0xe5/0x1b0 [ 721.942604][ C0] ? __sys_sendmsg_sock+0xb0/0xb0 [ 721.942607][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.942612][ C0] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.942615][ C0] do_syscall_64+0x2d/0x70 [ 721.942619][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.942622][ C0] RIP: 0033:0x441719 [ 721.942628][ 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 [ 721.942638][ C0] RSP: 002b:00007fff69f094f8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 721.942647][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441719 [ 721.942652][ C0] RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 [ 721.942657][ C0] RBP: 00007fff69f09500 R08: 0000000100000000 R09: 0000000100000000 [ 721.942663][ C0] R10: 0000000100000000 R11: 0000000000000246 R12: 0000000000076d14 [ 721.942668][ C0] R13: 00000000004025f0 R14: 0000000000000000 R15: 0000000000000000 [ 721.942673][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.609 msecs [ 721.965955][ T1646] Kernel panic - not syncing: hung_task: blocked tasks [ 722.575776][ T1646] CPU: 1 PID: 1646 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 722.584113][ T1646] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 722.594168][ T1646] Call Trace: [ 722.597452][ T1646] dump_stack+0x107/0x163 [ 722.601835][ T1646] panic+0x306/0x73d [ 722.605809][ T1646] ? __warn_printk+0xf3/0xf3 [ 722.610415][ T1646] ? lapic_can_unplug_cpu+0x80/0x80 [ 722.615622][ T1646] ? preempt_schedule_thunk+0x16/0x18 [ 722.621020][ T1646] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 722.627201][ T1646] ? watchdog.cold+0x5/0x158 [ 722.631852][ T1646] watchdog.cold+0x16/0x158 [ 722.636374][ T1646] ? reset_hung_task_detector+0x30/0x30 [ 722.641965][ T1646] kthread+0x3b1/0x4a0 [ 722.646039][ T1646] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 722.651939][ T1646] ret_from_fork+0x1f/0x30 [ 722.656906][ T1646] Kernel Offset: disabled [ 722.661260][ T1646] Rebooting in 86400 seconds..