[ 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 '10.128.0.223' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 488.304499][ T8494] IPVS: ftp: loaded support on port[0] = 21 [ 721.359542][ T1659] INFO: task kworker/1:0:8486 blocked for more than 143 seconds. [ 721.367522][ T1659] Not tainted 5.11.0-rc3-syzkaller #0 [ 721.375995][ T1659] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.385605][ T1659] task:kworker/1:0 state:D stack:29624 pid: 8486 ppid: 2 flags:0x00004000 [ 721.395768][ T1659] Workqueue: ipv6_addrconf addrconf_verify_work [ 721.403420][ T1659] Call Trace: [ 721.406762][ T1659] __schedule+0x90c/0x21a0 [ 721.412492][ T1659] ? io_schedule_timeout+0x140/0x140 [ 721.417813][ T1659] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.424654][ T1659] ? lockdep_hardirqs_on+0x79/0x100 [ 721.431991][ T1659] schedule+0xcf/0x270 [ 721.436108][ T1659] schedule_preempt_disabled+0xf/0x20 [ 721.443035][ T1659] __mutex_lock+0x81a/0x1110 [ 721.447664][ T1659] ? addrconf_verify_work+0xa/0x20 [ 721.454218][ T1659] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.460594][ T1659] ? lock_release+0x710/0x710 [ 721.465427][ T1659] ? lock_downgrade+0x6d0/0x6d0 [ 721.471617][ T1659] addrconf_verify_work+0xa/0x20 [ 721.476588][ T1659] process_one_work+0x98d/0x15f0 [ 721.483066][ T1659] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.488484][ T1659] ? rwlock_bug.part.0+0x90/0x90 [ 721.494912][ T1659] ? _raw_spin_lock_irq+0x41/0x50 [ 721.500909][ T1659] worker_thread+0x64c/0x1120 [ 721.505653][ T1659] ? __kthread_parkme+0x13f/0x1e0 [ 721.512304][ T1659] ? process_one_work+0x15f0/0x15f0 [ 721.517563][ T1659] kthread+0x3b1/0x4a0 [ 721.523285][ T1659] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.529216][ T1659] ret_from_fork+0x1f/0x30 [ 721.535240][ T1659] [ 721.535240][ T1659] Showing all locks held in the system: [ 721.544122][ T1659] 1 lock held by khungtaskd/1659: [ 721.549276][ T1659] #0: ffffffff8b373920 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.563199][ T1659] 1 lock held by in:imklog/8167: [ 721.568171][ T1659] #0: ffff888018bbe370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.579261][ T1659] 3 locks held by kworker/1:0/8486: [ 721.585578][ T1659] #0: ffff8881478e2538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 721.597675][ T1659] #1: ffffc90001d9fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 721.609624][ T1659] #2: ffffffff8ca586a8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 721.619121][ T1659] 2 locks held by syz-executor330/8517: [ 721.626491][ T1659] [ 721.628875][ T1659] ============================================= [ 721.628875][ T1659] [ 721.639118][ T1659] NMI backtrace for cpu 0 [ 721.643588][ T1659] CPU: 0 PID: 1659 Comm: khungtaskd Not tainted 5.11.0-rc3-syzkaller #0 [ 721.652114][ T1659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.662283][ T1659] Call Trace: [ 721.665596][ T1659] dump_stack+0x107/0x163 [ 721.670050][ T1659] nmi_cpu_backtrace.cold+0x44/0xd7 [ 721.675279][ T1659] ? lapic_can_unplug_cpu+0x80/0x80 [ 721.681102][ T1659] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 721.687205][ T1659] watchdog+0xd43/0xfa0 [ 721.691477][ T1659] ? reset_hung_task_detector+0x30/0x30 [ 721.697052][ T1659] kthread+0x3b1/0x4a0 [ 721.701144][ T1659] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 721.707067][ T1659] ret_from_fork+0x1f/0x30 [ 721.711730][ T1659] Sending NMI from CPU 0 to CPUs 1: [ 721.718778][ C1] NMI backtrace for cpu 1 [ 721.718790][ C1] CPU: 1 PID: 8517 Comm: syz-executor330 Not tainted 5.11.0-rc3-syzkaller #0 [ 721.718800][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.718810][ C1] RIP: 0010:rcu_lockdep_current_cpu_online+0x83/0x150 [ 721.718822][ C1] Code: 3c 02 00 0f 85 ad 00 00 00 48 03 1c ed c0 c6 e6 8a 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 18 48 89 fa 48 c1 ea 03 80 3c 02 00 <0f> 85 90 00 00 00 48 8d 7b 20 48 8b 6b 18 48 b8 00 00 00 00 00 fc [ 721.718838][ C1] RSP: 0018:ffffc900019aeb98 EFLAGS: 00000246 [ 721.718852][ C1] RAX: dffffc0000000000 RBX: ffff8880b9f35a80 RCX: ffffffff8158c5c1 [ 721.718862][ C1] RDX: 1ffff110173e6b53 RSI: 0000000000000002 RDI: ffff8880b9f35a98 [ 721.718871][ C1] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8d03798f [ 721.718880][ C1] R10: fffffbfff1a06f31 R11: 0000000000000000 R12: 0000000000000001 [ 721.718888][ C1] R13: 0000000000000001 R14: 1ffff92000335d95 R15: ffff888014509600 [ 721.718898][ C1] FS: 0000000002517880(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000 [ 721.718913][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 721.718922][ C1] CR2: 00007fada5059000 CR3: 0000000020898000 CR4: 00000000001506e0 [ 721.718931][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 721.718940][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 721.718947][ C1] Call Trace: [ 721.718952][ C1] rcu_read_lock_sched_held+0x25/0x70 [ 721.718959][ C1] lock_release+0x5b7/0x710 [ 721.718965][ C1] ? tcf_idr_check_alloc+0x29e/0x3b0 [ 721.718972][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.718979][ C1] ? asm_sysvec_reschedule_ipi+0x12/0x20 [ 721.718986][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.718993][ C1] ? lockdep_hardirqs_on+0x79/0x100 [ 721.719000][ C1] ? asm_sysvec_reschedule_ipi+0x12/0x20 [ 721.719007][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.719014][ C1] __mutex_unlock_slowpath+0x81/0x610 [ 721.719022][ C1] ? wait_for_completion_io+0x260/0x260 [ 721.719029][ C1] ? __radix_tree_lookup+0x211/0x2a0 [ 721.719036][ C1] tcf_idr_check_alloc+0x29e/0x3b0 [ 721.719042][ C1] tcf_police_init+0x34f/0x1460 [ 721.719049][ C1] ? tcf_police_cleanup+0x60/0x60 [ 721.719056][ C1] ? find_held_lock+0x2d/0x110 [ 721.719062][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 721.719069][ C1] ? kernel_text_address+0xbd/0xf0 [ 721.719076][ C1] tcf_action_init_1+0x1a3/0x990 [ 721.719083][ C1] ? tcf_action_dump_old+0x80/0x80 [ 721.719090][ C1] ? stack_trace_consume_entry+0x160/0x160 [ 721.719097][ C1] ? kasan_save_stack+0x32/0x40 [ 721.719104][ C1] ? kasan_save_stack+0x32/0x40 [ 721.719115][ C1] ? kasan_save_stack+0x1b/0x40 [ 721.719122][ C1] ? ____kasan_kmalloc.constprop.0+0x82/0xa0 [ 721.719129][ C1] ? fw_change+0x91b/0x13e0 [ 721.719136][ C1] ? rtnetlink_rcv_msg+0x80e/0xad0 [ 721.719143][ C1] ? netlink_rcv_skb+0x153/0x420 [ 721.719150][ C1] ? netlink_unicast+0x533/0x7d0 [ 721.719156][ C1] ? netlink_sendmsg+0x856/0xd90 [ 721.719163][ C1] ? sock_sendmsg+0xcf/0x120 [ 721.719169][ C1] ? ____sys_sendmsg+0x331/0x810 [ 721.719176][ C1] tcf_exts_validate+0x138/0x420 [ 721.719183][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 721.719189][ C1] fw_set_parms+0x13d/0xaa0 [ 721.719195][ C1] ? fw_delete+0x8c0/0x8c0 [ 721.719201][ C1] ? unpoison_range+0x3a/0x60 [ 721.719206][ C1] fw_change+0xa30/0x13e0 [ 721.719211][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.719215][ C1] ? fw_set_parms+0xaa0/0xaa0 [ 721.719218][ C1] ? tc_new_tfilter+0x132a/0x2120 [ 721.719221][ C1] tc_new_tfilter+0x1394/0x2120 [ 721.719225][ C1] ? fw_set_parms+0xaa0/0xaa0 [ 721.719228][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.719232][ C1] ? lock_chain_count+0x20/0x20 [ 721.719235][ C1] ? kernel_text_address+0xbd/0xf0 [ 721.719239][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 721.719243][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 721.719246][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.719250][ C1] netlink_rcv_skb+0x153/0x420 [ 721.719254][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.719257][ C1] ? netlink_ack+0xaa0/0xaa0 [ 721.719261][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 721.719264][ C1] netlink_unicast+0x533/0x7d0 [ 721.719268][ C1] ? netlink_attachskb+0x870/0x870 [ 721.719271][ C1] ? _copy_from_iter_full+0x275/0x850 [ 721.719275][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.719279][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 721.719283][ C1] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 721.719287][ C1] ? __check_object_size+0x171/0x3f0 [ 721.719290][ C1] netlink_sendmsg+0x856/0xd90 [ 721.719294][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.719297][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.719301][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.719305][ C1] sock_sendmsg+0xcf/0x120 [ 721.719308][ C1] ____sys_sendmsg+0x331/0x810 [ 721.719311][ C1] ? kernel_sendmsg+0x50/0x50 [ 721.719314][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 721.719318][ C1] ? __lock_acquire+0x16c2/0x54f0 [ 721.719321][ C1] ___sys_sendmsg+0xf3/0x170 [ 721.719325][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 721.719337][ C1] ? find_held_lock+0x2d/0x110 [ 721.719343][ C1] ? __might_fault+0xd3/0x180 [ 721.719349][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.719355][ C1] __sys_sendmmsg+0x195/0x470 [ 721.719361][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 721.719365][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.719369][ C1] ? sockfd_lookup_light+0xc5/0x180 [ 721.719373][ C1] ? __sys_sendmsg+0x10c/0x1b0 [ 721.719376][ C1] ? __sys_sendmsg_sock+0xb0/0xb0 [ 721.719380][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.719384][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 721.719388][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.719391][ C1] do_syscall_64+0x2d/0x70 [ 721.719395][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.719399][ C1] RIP: 0033:0x441739 [ 721.719405][ 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 [ 721.719414][ C1] RSP: 002b:00007ffc1c73d538 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 721.719424][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441739 [ 721.719429][ C1] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 721.719434][ C1] RBP: 00007ffc1c73d540 R08: 0000000100000000 R09: 0000000100000000 [ 721.719439][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000773a5 [ 721.719445][ C1] R13: 0000000000402610 R14: 0000000000000000 R15: 0000000000000000 [ 721.719450][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.774 msecs [ 721.721102][ T1659] Kernel panic - not syncing: hung_task: blocked tasks [ 722.413705][ T1659] CPU: 0 PID: 1659 Comm: khungtaskd Not tainted 5.11.0-rc3-syzkaller #0 [ 722.422051][ T1659] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 722.432125][ T1659] Call Trace: [ 722.435436][ T1659] dump_stack+0x107/0x163 [ 722.439798][ T1659] panic+0x306/0x73d [ 722.443757][ T1659] ? __warn_printk+0xf3/0xf3 [ 722.448406][ T1659] ? lapic_can_unplug_cpu+0x80/0x80 [ 722.453627][ T1659] ? preempt_schedule_thunk+0x16/0x18 [ 722.459044][ T1659] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 722.465237][ T1659] ? watchdog.cold+0x5/0x158 [ 722.469897][ T1659] watchdog.cold+0x16/0x158 [ 722.474431][ T1659] ? reset_hung_task_detector+0x30/0x30 [ 722.480003][ T1659] kthread+0x3b1/0x4a0 [ 722.484097][ T1659] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 722.490066][ T1659] ret_from_fork+0x1f/0x30 [ 722.495791][ T1659] Kernel Offset: disabled [ 722.500126][ T1659] Rebooting in 86400 seconds..