[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.9' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 487.844417][ T35] audit: type=1400 audit(1610137852.258:9): avc: denied { execmem } for pid=8484 comm="syz-executor569" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 487.868517][ T8485] IPVS: ftp: loaded support on port[0] = 21 [ 487.917284][ T8507] netlink: 8 bytes leftover after parsing attributes in process `syz-executor569'. [ 487.928147][ T8507] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor569'. [ 487.939686][ T8507] netlink: 8 bytes leftover after parsing attributes in process `syz-executor569'. [ 487.949104][ T8507] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor569'. [ 721.435208][ T1649] INFO: task kworker/1:0:19 blocked for more than 143 seconds. [ 721.442966][ T1649] Not tainted 5.11.0-rc2-syzkaller #0 [ 721.452877][ T1649] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.462604][ T1649] task:kworker/1:0 state:D stack:27168 pid: 19 ppid: 2 flags:0x00004000 [ 721.472831][ T1649] Workqueue: ipv6_addrconf addrconf_verify_work [ 721.481632][ T1649] Call Trace: [ 721.484974][ T1649] __schedule+0x90c/0x21a0 [ 721.490980][ T1649] ? io_schedule_timeout+0x140/0x140 [ 721.498836][ T1649] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.504068][ T1649] ? lockdep_hardirqs_on+0x79/0x100 [ 721.510742][ T1649] schedule+0xcf/0x270 [ 721.514843][ T1649] schedule_preempt_disabled+0xf/0x20 [ 721.521686][ T1649] __mutex_lock+0x81a/0x1110 [ 721.527181][ T1649] ? addrconf_verify_work+0xa/0x20 [ 721.532327][ T1649] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.539206][ T1649] ? lock_release+0x710/0x710 [ 721.543980][ T1649] ? lock_downgrade+0x6d0/0x6d0 [ 721.550250][ T1649] addrconf_verify_work+0xa/0x20 [ 721.556174][ T1649] process_one_work+0x98d/0x15f0 [ 721.561220][ T1649] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.568157][ T1649] ? rwlock_bug.part.0+0x90/0x90 [ 721.573150][ T1649] ? _raw_spin_lock_irq+0x41/0x50 [ 721.581140][ T1649] worker_thread+0x64c/0x1120 [ 721.586725][ T1649] ? process_one_work+0x15f0/0x15f0 [ 721.591957][ T1649] kthread+0x3b1/0x4a0 [ 721.597495][ T1649] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.603423][ T1649] ret_from_fork+0x1f/0x30 [ 721.609514][ T1649] [ 721.609514][ T1649] Showing all locks held in the system: [ 721.618214][ T1649] 3 locks held by kworker/1:0/19: [ 721.623254][ T1649] #0: ffff888147b22538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 721.635737][ T1649] #1: ffffc90000dafda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 721.647448][ T1649] #2: ffffffff8c948ae8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 721.658081][ T1649] 1 lock held by khungtaskd/1649: [ 721.663120][ T1649] #0: ffffffff8b363860 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.674627][ T1649] 1 lock held by in:imklog/8195: [ 721.680677][ T1649] #0: ffff88801205a1b0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.690789][ T1649] 2 locks held by syz-executor569/8507: [ 721.697293][ T1649] [ 721.699807][ T1649] ============================================= [ 721.699807][ T1649] [ 721.711135][ T1649] NMI backtrace for cpu 0 [ 721.715601][ T1649] CPU: 0 PID: 1649 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 721.723939][ T1649] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.734008][ T1649] Call Trace: [ 721.737324][ T1649] dump_stack+0x107/0x163 [ 721.741710][ T1649] nmi_cpu_backtrace.cold+0x44/0xd7 [ 721.746921][ T1649] ? lapic_can_unplug_cpu+0x80/0x80 [ 721.752213][ T1649] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 721.758265][ T1649] watchdog+0xd43/0xfa0 [ 721.762501][ T1649] ? reset_hung_task_detector+0x30/0x30 [ 721.768069][ T1649] kthread+0x3b1/0x4a0 [ 721.772150][ T1649] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.778060][ T1649] ret_from_fork+0x1f/0x30 [ 721.782717][ T1649] Sending NMI from CPU 0 to CPUs 1: [ 721.789790][ C1] NMI backtrace for cpu 1 [ 721.789800][ C1] CPU: 1 PID: 8507 Comm: syz-executor569 Not tainted 5.11.0-rc2-syzkaller #0 [ 721.789810][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.789819][ C1] RIP: 0010:mark_lock+0x50/0x1730 [ 721.789830][ C1] Code: 24 48 c7 44 24 30 b3 8a b5 41 48 c1 eb 03 48 c7 44 24 38 f8 76 c6 8a 48 8d 04 13 48 c7 44 24 40 b0 09 58 81 c7 00 f1 f1 f1 f1 40 04 00 f2 f2 f2 c7 40 08 00 f2 f2 f2 c7 40 10 00 00 00 f3 c7 [ 721.789846][ C1] RSP: 0018:ffffc90000ff6860 EFLAGS: 00000806 [ 721.789859][ C1] RAX: fffff520001fed12 RBX: 1ffff920001fed12 RCX: ffffffff81580aa7 [ 721.789868][ C1] RDX: dffffc0000000000 RSI: ffff88801a3c6b30 RDI: ffff88801a3c6180 [ 721.789877][ C1] RBP: ffff88801a3c6180 R08: 0000000000000000 R09: ffffffff8ebe986f [ 721.789886][ C1] R10: fffffbfff1d7d30d R11: 0000000000000000 R12: 0000000000000008 [ 721.789894][ C1] R13: ffff88801a3c6b52 R14: dffffc0000000000 R15: ffff88801a3c6b08 [ 721.789903][ C1] FS: 0000000001eab880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 721.789912][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 721.789920][ C1] CR2: 00007fe655ee4000 CR3: 00000000268ba000 CR4: 00000000001506e0 [ 721.789929][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 721.789938][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 721.789945][ C1] Call Trace: [ 721.789950][ C1] ? lock_chain_count+0x20/0x20 [ 721.789956][ C1] ? finish_task_switch.isra.0+0x158/0x7e0 [ 721.789963][ C1] ? mark_lock+0xf7/0x1730 [ 721.789968][ C1] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.789974][ C1] ? lock_chain_count+0x20/0x20 [ 721.789980][ C1] ? _raw_spin_unlock_irq+0x2a/0x40 [ 721.789986][ C1] __lock_acquire+0x8bb/0x5500 [ 721.789992][ C1] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 721.789999][ C1] ? mark_held_locks+0x9f/0xe0 [ 721.790004][ C1] lock_acquire+0x29d/0x740 [ 721.790010][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.790016][ C1] ? lock_release+0x710/0x710 [ 721.790022][ C1] __mutex_lock+0x134/0x1110 [ 721.790028][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.790034][ C1] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 721.790042][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.790048][ C1] ? lockdep_hardirqs_on+0x79/0x100 [ 721.790055][ C1] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 721.790063][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.790070][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 721.790077][ C1] ? wait_for_completion_io+0x260/0x260 [ 721.790084][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 721.790090][ C1] tcf_police_init+0x347/0x13a0 [ 721.790097][ C1] ? tcf_police_cleanup+0x60/0x60 [ 721.790103][ C1] ? find_held_lock+0x2d/0x110 [ 721.790109][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 721.790116][ C1] tcf_action_init_1+0x1a3/0x990 [ 721.790122][ C1] ? tcf_action_dump_old+0x80/0x80 [ 721.790129][ C1] ? lock_chain_count+0x20/0x20 [ 721.790135][ C1] ? find_held_lock+0x2d/0x110 [ 721.790141][ C1] tcf_exts_validate+0x138/0x420 [ 721.790148][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 721.790154][ C1] ? rcu_read_lock_sched_held+0x3a/0x70 [ 721.790161][ C1] ? trace_kmalloc+0xbe/0xf0 [ 721.790167][ C1] ? kmem_cache_alloc_trace+0x1f9/0x400 [ 721.790174][ C1] rsvp_change+0x291/0x2990 [ 721.790180][ C1] ? find_held_lock+0x2d/0x110 [ 721.790186][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 721.790193][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.790199][ C1] ? blackhole_dequeue+0x10/0x10 [ 721.790207][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.790214][ C1] tc_new_tfilter+0x1394/0x2120 [ 721.790220][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 721.790227][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.790234][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.790240][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 721.790247][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.790253][ C1] netlink_rcv_skb+0x153/0x420 [ 721.790260][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.790266][ C1] ? netlink_ack+0xaa0/0xaa0 [ 721.790272][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 721.790277][ C1] netlink_unicast+0x533/0x7d0 [ 721.790283][ C1] ? netlink_attachskb+0x870/0x870 [ 721.790287][ C1] ? _copy_from_iter_full+0x275/0x850 [ 721.790291][ C1] netlink_sendmsg+0x856/0xd90 [ 721.790294][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.790298][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.790302][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.790305][ C1] sock_sendmsg+0xcf/0x120 [ 721.790308][ C1] ____sys_sendmsg+0x331/0x810 [ 721.790311][ C1] ? kernel_sendmsg+0x50/0x50 [ 721.790314][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 721.790318][ C1] ? alloc_file+0x5e/0x5a0 [ 721.790321][ C1] ? __lock_acquire+0x16b7/0x5500 [ 721.790324][ C1] ___sys_sendmsg+0xf3/0x170 [ 721.790328][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 721.790331][ C1] ? find_held_lock+0x2d/0x110 [ 721.790334][ C1] ? __might_fault+0xd3/0x180 [ 721.790338][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.790341][ C1] __sys_sendmmsg+0x195/0x470 [ 721.790344][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 721.790348][ C1] ? find_held_lock+0x2d/0x110 [ 721.790351][ C1] ? alloc_file_pseudo+0x1/0x250 [ 721.790355][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.790358][ C1] ? fd_install+0x215/0x640 [ 721.790362][ C1] ? __sys_socket+0x16d/0x200 [ 721.790365][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 721.790368][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.790372][ C1] do_syscall_64+0x2d/0x70 [ 721.790375][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.790379][ C1] RIP: 0033:0x441589 [ 721.790385][ 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 [ 721.790394][ C1] RSP: 002b:00007ffffc4c2638 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 721.790403][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441589 [ 721.790408][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 721.790413][ C1] RBP: 00007ffffc4c2640 R08: 0000000120080522 R09: 0000000120080522 [ 721.790419][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a3bb0 [ 721.790424][ C1] R13: 0000000000402460 R14: 0000000000000000 R15: 0000000000000000 [ 721.790429][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.716 msecs [ 721.790780][ T1649] Kernel panic - not syncing: hung_task: blocked tasks [ 722.419324][ T1649] CPU: 0 PID: 1649 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 722.427662][ T1649] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 722.437724][ T1649] Call Trace: [ 722.441028][ T1649] dump_stack+0x107/0x163 [ 722.445377][ T1649] panic+0x306/0x73d [ 722.449357][ T1649] ? __warn_printk+0xf3/0xf3 [ 722.453968][ T1649] ? lapic_can_unplug_cpu+0x80/0x80 [ 722.459179][ T1649] ? preempt_schedule_thunk+0x16/0x18 [ 722.464583][ T1649] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 722.470752][ T1649] ? watchdog.cold+0x5/0x158 [ 722.475391][ T1649] watchdog.cold+0x16/0x158 [ 722.479912][ T1649] ? reset_hung_task_detector+0x30/0x30 [ 722.485482][ T1649] kthread+0x3b1/0x4a0 [ 722.489564][ T1649] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 722.495471][ T1649] ret_from_fork+0x1f/0x30 [ 722.500522][ T1649] Kernel Offset: disabled [ 722.504884][ T1649] Rebooting in 86400 seconds..