[ 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 '10.128.0.104' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 504.413706][ T8498] IPVS: ftp: loaded support on port[0] = 21 [ 504.460848][ T8519] netlink: 1028 bytes leftover after parsing attributes in process `syz-executor176'. [ 504.471598][ T8519] netlink: 1028 bytes leftover after parsing attributes in process `syz-executor176'. [ 721.573535][ T1657] INFO: task kworker/0:2:3001 blocked for more than 143 seconds. [ 721.581999][ T1657] Not tainted 5.11.0-rc2-syzkaller #0 [ 721.590523][ T1657] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.600775][ T1657] task:kworker/0:2 state:D stack:27536 pid: 3001 ppid: 2 flags:0x00004000 [ 721.611497][ T1657] Workqueue: ipv6_addrconf addrconf_verify_work [ 721.619796][ T1657] Call Trace: [ 721.624174][ T1657] __schedule+0x90c/0x21a0 [ 721.628759][ T1657] ? io_schedule_timeout+0x140/0x140 [ 721.635962][ T1657] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.641309][ T1657] ? lockdep_hardirqs_on+0x79/0x100 [ 721.648170][ T1657] schedule+0xcf/0x270 [ 721.652304][ T1657] schedule_preempt_disabled+0xf/0x20 [ 721.660291][ T1657] __mutex_lock+0x81a/0x1110 [ 721.666164][ T1657] ? addrconf_verify_work+0xa/0x20 [ 721.671636][ T1657] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.678744][ T1657] ? lock_release+0x710/0x710 [ 721.684943][ T1657] ? lock_downgrade+0x6d0/0x6d0 [ 721.689871][ T1657] addrconf_verify_work+0xa/0x20 [ 721.697027][ T1657] process_one_work+0x98d/0x15f0 [ 721.702578][ T1657] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.709763][ T1657] ? rwlock_bug.part.0+0x90/0x90 [ 721.716124][ T1657] ? _raw_spin_lock_irq+0x41/0x50 [ 721.721359][ T1657] worker_thread+0x64c/0x1120 [ 721.727695][ T1657] ? __kthread_parkme+0x13f/0x1e0 [ 721.732832][ T1657] ? process_one_work+0x15f0/0x15f0 [ 721.739826][ T1657] kthread+0x3b1/0x4a0 [ 721.745093][ T1657] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.751367][ T1657] ret_from_fork+0x1f/0x30 [ 721.757510][ T1657] [ 721.757510][ T1657] Showing all locks held in the system: [ 721.766268][ T1657] 1 lock held by khungtaskd/1657: [ 721.771466][ T1657] #0: ffffffff8b363860 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.783928][ T1657] 3 locks held by kworker/0:2/3001: [ 721.789402][ T1657] #0: ffff8881474f9538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 721.802090][ T1657] #1: ffffc90001a27da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 721.813904][ T1657] #2: ffffffff8c9465e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 721.824792][ T1657] 1 lock held by in:imklog/8193: [ 721.829947][ T1657] #0: ffff888025b4a5f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.840891][ T1657] 1 lock held by syz-executor176/8519: [ 721.847698][ T1657] [ 721.850117][ T1657] ============================================= [ 721.850117][ T1657] [ 721.860685][ T1657] NMI backtrace for cpu 1 [ 721.865341][ T1657] CPU: 1 PID: 1657 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 721.874002][ T1657] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.884093][ T1657] Call Trace: [ 721.887402][ T1657] dump_stack+0x107/0x163 [ 721.891948][ T1657] nmi_cpu_backtrace.cold+0x44/0xd7 [ 721.897185][ T1657] ? lapic_can_unplug_cpu+0x80/0x80 [ 721.902485][ T1657] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 721.908702][ T1657] watchdog+0xd43/0xfa0 [ 721.913129][ T1657] ? reset_hung_task_detector+0x30/0x30 [ 721.918806][ T1657] kthread+0x3b1/0x4a0 [ 721.923066][ T1657] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.929176][ T1657] ret_from_fork+0x1f/0x30 [ 721.933863][ T1657] Sending NMI from CPU 1 to CPUs 0: [ 721.940909][ C0] NMI backtrace for cpu 0 [ 721.940921][ C0] CPU: 0 PID: 8519 Comm: syz-executor176 Not tainted 5.11.0-rc2-syzkaller #0 [ 721.940931][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.940940][ C0] RIP: 0010:rcu_is_watching+0x86/0xc0 [ 721.940951][ C0] Code: c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 1f 8b 83 28 01 00 00 d1 e8 83 e0 01 65 ff 0d ba f7 a2 7e <74> 03 5b 5d c3 e8 0f 4d a1 ff 5b 5d c3 e8 28 11 56 00 eb da e8 31 [ 721.940967][ C0] RSP: 0018:ffffc900012eec58 EFLAGS: 00000282 [ 721.940981][ C0] RAX: 0000000000000001 RBX: ffff8880b9e35a80 RCX: ffffffff815886a1 [ 721.940990][ C0] RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff8880b9e35ba8 [ 721.940999][ C0] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8cef554f [ 721.941008][ C0] R10: fffffbfff19deaa9 R11: 0000000000000000 R12: 0000000000000001 [ 721.941016][ C0] R13: 0000000000000001 R14: 1ffff9200025ddad R15: ffff888024c50a00 [ 721.941025][ C0] FS: 0000000001729880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 721.941034][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 721.941042][ C0] CR2: 00007f8842bcc000 CR3: 000000001afec000 CR4: 00000000001506f0 [ 721.941051][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 721.941060][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 721.941067][ C0] Call Trace: [ 721.941072][ C0] rcu_read_lock_sched_held+0x1c/0x70 [ 721.941079][ C0] lock_release+0x5b7/0x710 [ 721.941084][ C0] ? tcf_idr_check_alloc+0x29e/0x3b0 [ 721.941090][ C0] ? lock_downgrade+0x6d0/0x6d0 [ 721.941096][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.941103][ C0] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.941109][ C0] __mutex_unlock_slowpath+0x81/0x610 [ 721.941116][ C0] ? wait_for_completion_io+0x260/0x260 [ 721.941122][ C0] tcf_idr_check_alloc+0x29e/0x3b0 [ 721.941128][ C0] tcf_police_init+0x347/0x13a0 [ 721.941134][ C0] ? tcf_police_cleanup+0x60/0x60 [ 721.941140][ C0] ? find_held_lock+0x2d/0x110 [ 721.941146][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 721.941152][ C0] ? stack_trace_save+0x8c/0xc0 [ 721.941158][ C0] tcf_action_init_1+0x1a3/0x990 [ 721.941164][ C0] ? tcf_action_dump_old+0x80/0x80 [ 721.941170][ C0] ? ____sys_sendmsg+0x331/0x810 [ 721.941176][ C0] ? ___sys_sendmsg+0xf3/0x170 [ 721.941181][ C0] ? __sys_sendmmsg+0x195/0x470 [ 721.941187][ C0] ? __x64_sys_sendmmsg+0x99/0x100 [ 721.941193][ C0] ? do_syscall_64+0x2d/0x70 [ 721.941199][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.941206][ C0] ? find_held_lock+0x2d/0x110 [ 721.941212][ C0] tcf_exts_validate+0x138/0x420 [ 721.941218][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 721.941224][ C0] ? unpoison_range+0x3a/0x60 [ 721.941229][ C0] route4_change+0x6d8/0x2380 [ 721.941235][ C0] ? tc_new_tfilter+0x1ba1/0x2120 [ 721.941241][ C0] ? route4_delete+0xb70/0xb70 [ 721.941247][ C0] ? tc_new_tfilter+0x132a/0x2120 [ 721.941253][ C0] tc_new_tfilter+0x1394/0x2120 [ 721.941259][ C0] ? route4_delete+0xb70/0xb70 [ 721.941265][ C0] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.941271][ C0] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.941277][ C0] rtnetlink_rcv_msg+0x80e/0xad0 [ 721.941283][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 721.941289][ C0] netlink_rcv_skb+0x153/0x420 [ 721.941295][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 721.941301][ C0] ? netlink_ack+0xaa0/0xaa0 [ 721.941307][ C0] ? netlink_deliver_tap+0x227/0xb70 [ 721.941314][ C0] netlink_unicast+0x533/0x7d0 [ 721.941320][ C0] ? netlink_attachskb+0x870/0x870 [ 721.941327][ C0] ? _copy_from_iter_full+0x275/0x850 [ 721.941334][ C0] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.941341][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 721.941348][ C0] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 721.941355][ C0] ? __check_object_size+0x171/0x3f0 [ 721.941362][ C0] netlink_sendmsg+0x856/0xd90 [ 721.941368][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 721.941375][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.941383][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 721.941389][ C0] sock_sendmsg+0xcf/0x120 [ 721.941395][ C0] ____sys_sendmsg+0x331/0x810 [ 721.941401][ C0] ? kernel_sendmsg+0x50/0x50 [ 721.941407][ C0] ? do_recvmmsg+0x6c0/0x6c0 [ 721.941413][ C0] ? __lock_acquire+0x16b7/0x5500 [ 721.941420][ C0] ___sys_sendmsg+0xf3/0x170 [ 721.941426][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 721.941433][ C0] ? find_held_lock+0x2d/0x110 [ 721.941439][ C0] ? __might_fault+0xd3/0x180 [ 721.941445][ C0] ? lock_downgrade+0x6d0/0x6d0 [ 721.941451][ C0] __sys_sendmmsg+0x195/0x470 [ 721.941458][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 721.941464][ C0] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.941472][ C0] ? sockfd_lookup_light+0xc5/0x180 [ 721.941479][ C0] ? __sys_sendmsg+0x10c/0x1b0 [ 721.941485][ C0] ? __sys_sendmsg_sock+0xb0/0xb0 [ 721.941492][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.941499][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 721.941506][ C0] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.941513][ C0] do_syscall_64+0x2d/0x70 [ 721.941519][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.941526][ C0] RIP: 0033:0x441609 [ 721.941536][ 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 [ 721.941551][ C0] RSP: 002b:00007fff86a71928 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 721.941563][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441609 [ 721.941571][ C0] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 721.941579][ C0] RBP: 00007fff86a71930 R08: 0000000120080522 R09: 0000000120080522 [ 721.941587][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2990 [ 721.941595][ C0] R13: 00000000004024e0 R14: 0000000000000000 R15: 0000000000000000 [ 721.941603][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.565 msecs [ 721.942057][ T1657] Kernel panic - not syncing: hung_task: blocked tasks [ 722.545682][ T1657] CPU: 1 PID: 1657 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 722.554258][ T1657] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 722.564615][ T1657] Call Trace: [ 722.567933][ T1657] dump_stack+0x107/0x163 [ 722.572454][ T1657] panic+0x306/0x73d [ 722.576432][ T1657] ? __warn_printk+0xf3/0xf3 [ 722.581159][ T1657] ? lapic_can_unplug_cpu+0x80/0x80 [ 722.586397][ T1657] ? preempt_schedule_thunk+0x16/0x18 [ 722.591888][ T1657] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 722.598078][ T1657] ? watchdog.cold+0x5/0x158 [ 722.604141][ T1657] watchdog.cold+0x16/0x158 [ 722.608737][ T1657] ? reset_hung_task_detector+0x30/0x30 [ 722.614348][ T1657] kthread+0x3b1/0x4a0 [ 722.618597][ T1657] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 722.625260][ T1657] ret_from_fork+0x1f/0x30 [ 722.630736][ T1657] Kernel Offset: disabled [ 722.635193][ T1657] Rebooting in 86400 seconds..