[ 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 '10.128.0.77' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 605.297826][ T8471] IPVS: ftp: loaded support on port[0] = 21 [ 605.343645][ T8492] netlink: 1028 bytes leftover after parsing attributes in process `syz-executor537'. [ 605.354265][ T8492] netlink: 1028 bytes leftover after parsing attributes in process `syz-executor537'. [ 864.786297][ T1654] INFO: task kworker/0:1:8463 blocked for more than 143 seconds. [ 864.794198][ T1654] Not tainted 5.11.0-rc2-syzkaller #0 [ 864.802455][ T1654] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 864.812425][ T1654] task:kworker/0:1 state:D stack:29768 pid: 8463 ppid: 2 flags:0x00004000 [ 864.822583][ T1654] Workqueue: ipv6_addrconf addrconf_verify_work [ 864.829996][ T1654] Call Trace: [ 864.833838][ T1654] __schedule+0x90c/0x21a0 [ 864.840037][ T1654] ? io_schedule_timeout+0x140/0x140 [ 864.845370][ T1654] ? _raw_spin_unlock_irq+0x1f/0x40 [ 864.852845][ T1654] ? lockdep_hardirqs_on+0x79/0x100 [ 864.859255][ T1654] schedule+0xcf/0x270 [ 864.863391][ T1654] schedule_preempt_disabled+0xf/0x20 [ 864.870143][ T1654] __mutex_lock+0x81a/0x1110 [ 864.874765][ T1654] ? addrconf_verify_work+0xa/0x20 [ 864.881137][ T1654] ? mutex_lock_io_nested+0xf60/0xf60 [ 864.887583][ T1654] ? lock_release+0x710/0x710 [ 864.892320][ T1654] ? lock_downgrade+0x6d0/0x6d0 [ 864.899624][ T1654] addrconf_verify_work+0xa/0x20 [ 864.904594][ T1654] process_one_work+0x98d/0x15f0 [ 864.910935][ T1654] ? pwq_dec_nr_in_flight+0x320/0x320 [ 864.917246][ T1654] ? rwlock_bug.part.0+0x90/0x90 [ 864.922286][ T1654] ? _raw_spin_lock_irq+0x41/0x50 [ 864.928625][ T1654] worker_thread+0x64c/0x1120 [ 864.933347][ T1654] ? __kthread_parkme+0x13f/0x1e0 [ 864.939702][ T1654] ? process_one_work+0x15f0/0x15f0 [ 864.944952][ T1654] kthread+0x3b1/0x4a0 [ 864.950374][ T1654] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 864.957400][ T1654] ret_from_fork+0x1f/0x30 [ 864.962153][ T1654] [ 864.962153][ T1654] Showing all locks held in the system: [ 864.971204][ T1654] 1 lock held by khungtaskd/1654: [ 864.977592][ T1654] #0: ffffffff8b363820 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 864.988438][ T1654] 1 lock held by in:imklog/8174: [ 864.993385][ T1654] #0: ffff88801fbddc70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 865.003902][ T1654] 3 locks held by kworker/0:1/8463: [ 865.010024][ T1654] #0: ffff888020eb5938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 865.021918][ T1654] #1: ffffc90000fdfda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 865.034310][ T1654] #2: ffffffff8c9463e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 865.044873][ T1654] 1 lock held by syz-executor537/8492: [ 865.051217][ T1654] [ 865.053558][ T1654] ============================================= [ 865.053558][ T1654] [ 865.063448][ T1654] NMI backtrace for cpu 0 [ 865.067951][ T1654] CPU: 0 PID: 1654 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 865.076286][ T1654] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.086355][ T1654] Call Trace: [ 865.089646][ T1654] dump_stack+0x107/0x163 [ 865.094034][ T1654] nmi_cpu_backtrace.cold+0x44/0xd7 [ 865.099247][ T1654] ? lapic_can_unplug_cpu+0x80/0x80 [ 865.104510][ T1654] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 865.110546][ T1654] watchdog+0xd43/0xfa0 [ 865.114951][ T1654] ? reset_hung_task_detector+0x30/0x30 [ 865.120535][ T1654] kthread+0x3b1/0x4a0 [ 865.124618][ T1654] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 865.130523][ T1654] ret_from_fork+0x1f/0x30 [ 865.136105][ T1654] Sending NMI from CPU 0 to CPUs 1: [ 865.142823][ C1] NMI backtrace for cpu 1 [ 865.142833][ C1] CPU: 1 PID: 8492 Comm: syz-executor537 Not tainted 5.11.0-rc2-syzkaller #0 [ 865.142843][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.142852][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x60 [ 865.142864][ C1] Code: 81 e1 00 01 00 00 65 48 8b 14 25 00 f0 01 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 cc 14 00 00 85 c0 74 2b 8b 82 a8 14 00 00 <83> f8 02 75 20 48 8b 8a b0 14 00 00 8b 92 ac 14 00 00 48 8b 01 48 [ 865.142881][ C1] RSP: 0018:ffffc9000110ed88 EFLAGS: 00000246 [ 865.142892][ C1] RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 0000000000000000 [ 865.142902][ C1] RDX: ffff888022023780 RSI: ffffffff83d63602 RDI: 0000000000000003 [ 865.142911][ C1] RBP: 0000000000000010 R08: 0000000000000002 R09: ffff888013461407 [ 865.142919][ C1] R10: ffffffff83d635f3 R11: 0000000000000000 R12: ffffc9000110f038 [ 865.142928][ C1] R13: 0000000000000001 R14: ffff888013461400 R15: 0000000000000002 [ 865.142937][ C1] FS: 0000000001428880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 865.142947][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 865.142955][ C1] CR2: 00007fd79d576000 CR3: 00000000118b2000 CR4: 00000000001506e0 [ 865.142963][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 865.142972][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 865.142980][ C1] Call Trace: [ 865.142984][ C1] __radix_tree_lookup+0xa2/0x290 [ 865.142990][ C1] tcf_idr_check_alloc+0xb0/0x3b0 [ 865.142995][ C1] tcf_police_init+0x347/0x13a0 [ 865.143000][ C1] ? tcf_police_cleanup+0x60/0x60 [ 865.143006][ C1] ? find_held_lock+0x2d/0x110 [ 865.143011][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 865.143017][ C1] ? stack_trace_save+0x8c/0xc0 [ 865.143022][ C1] tcf_action_init_1+0x1a3/0x990 [ 865.143028][ C1] ? tcf_action_dump_old+0x80/0x80 [ 865.143034][ C1] ? ____sys_sendmsg+0x331/0x810 [ 865.143039][ C1] ? ___sys_sendmsg+0xf3/0x170 [ 865.143044][ C1] ? __sys_sendmmsg+0x195/0x470 [ 865.143050][ C1] ? __x64_sys_sendmmsg+0x99/0x100 [ 865.143055][ C1] ? do_syscall_64+0x2d/0x70 [ 865.143061][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 865.143067][ C1] ? find_held_lock+0x2d/0x110 [ 865.143072][ C1] tcf_exts_validate+0x138/0x420 [ 865.143078][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 865.143084][ C1] ? unpoison_range+0x3a/0x60 [ 865.143089][ C1] route4_change+0x6d8/0x2380 [ 865.143094][ C1] ? tc_new_tfilter+0x1b11/0x2120 [ 865.143100][ C1] ? route4_delete+0xb70/0xb70 [ 865.143105][ C1] ? tc_new_tfilter+0x132a/0x2120 [ 865.143111][ C1] tc_new_tfilter+0x1394/0x2120 [ 865.143116][ C1] ? route4_delete+0xb70/0xb70 [ 865.143121][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 865.143127][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 865.143132][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 865.143138][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 865.143144][ C1] netlink_rcv_skb+0x153/0x420 [ 865.143149][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 865.143155][ C1] ? netlink_ack+0xaa0/0xaa0 [ 865.143160][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 865.143166][ C1] netlink_unicast+0x533/0x7d0 [ 865.143171][ C1] ? netlink_attachskb+0x870/0x870 [ 865.143177][ C1] ? _copy_from_iter_full+0x275/0x850 [ 865.143183][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 865.143190][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 865.143195][ C1] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 865.143202][ C1] ? __check_object_size+0x171/0x3f0 [ 865.143207][ C1] netlink_sendmsg+0x856/0xd90 [ 865.143213][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 865.143219][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 865.143225][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 865.143230][ C1] sock_sendmsg+0xcf/0x120 [ 865.143235][ C1] ____sys_sendmsg+0x331/0x810 [ 865.143241][ C1] ? kernel_sendmsg+0x50/0x50 [ 865.143246][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 865.143251][ C1] ? __lock_acquire+0x16b7/0x5500 [ 865.143257][ C1] ___sys_sendmsg+0xf3/0x170 [ 865.143262][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 865.143268][ C1] ? find_held_lock+0x2d/0x110 [ 865.143273][ C1] ? __might_fault+0xd3/0x180 [ 865.143278][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 865.143284][ C1] __sys_sendmmsg+0x195/0x470 [ 865.143289][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 865.143295][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 865.143301][ C1] ? sockfd_lookup_light+0xc5/0x180 [ 865.143307][ C1] ? __sys_sendmsg+0x10c/0x1b0 [ 865.143312][ C1] ? __sys_sendmsg_sock+0xb0/0xb0 [ 865.143318][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 865.143325][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 865.143329][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 865.143335][ C1] do_syscall_64+0x2d/0x70 [ 865.143339][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 865.143344][ C1] RIP: 0033:0x441609 [ 865.143353][ 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 [ 865.143368][ C1] RSP: 002b:00007fff709750d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 865.143379][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441609 [ 865.143387][ C1] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 865.143399][ C1] RBP: 00007fff709750e0 R08: 0000000120080522 R09: 0000000120080522 [ 865.143406][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2990 [ 865.143414][ C1] R13: 00000000004024e0 R14: 0000000000000000 R15: 0000000000000000 [ 865.143422][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.466 msecs [ 865.143795][ T1654] Kernel panic - not syncing: hung_task: blocked tasks [ 865.700001][ T1654] CPU: 0 PID: 1654 Comm: khungtaskd Not tainted 5.11.0-rc2-syzkaller #0 [ 865.708357][ T1654] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.718420][ T1654] Call Trace: [ 865.721721][ T1654] dump_stack+0x107/0x163 [ 865.726086][ T1654] panic+0x306/0x73d [ 865.730037][ T1654] ? __warn_printk+0xf3/0xf3 [ 865.734643][ T1654] ? lapic_can_unplug_cpu+0x80/0x80 [ 865.739853][ T1654] ? preempt_schedule_thunk+0x16/0x18 [ 865.745278][ T1654] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 865.751457][ T1654] ? watchdog.cold+0x5/0x158 [ 865.756180][ T1654] watchdog.cold+0x16/0x158 [ 865.760704][ T1654] ? reset_hung_task_detector+0x30/0x30 [ 865.766264][ T1654] kthread+0x3b1/0x4a0 [ 865.770369][ T1654] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 865.776535][ T1654] ret_from_fork+0x1f/0x30 [ 865.781724][ T1654] Kernel Offset: disabled [ 865.786056][ T1654] Rebooting in 86400 seconds..