[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.4' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 504.783085][ T8483] IPVS: ftp: loaded support on port[0] = 21 [ 716.474308][ T1647] INFO: task kworker/1:3:4908 blocked for more than 143 seconds. [ 716.482946][ T1647] Not tainted 5.11.0-rc6-syzkaller #0 [ 716.493169][ T1647] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 716.503140][ T1647] task:kworker/1:3 state:D stack:29232 pid: 4908 ppid: 2 flags:0x00004000 [ 716.515230][ T1647] Workqueue: ipv6_addrconf addrconf_verify_work [ 716.522171][ T1647] Call Trace: [ 716.527306][ T1647] __schedule+0x90c/0x21a0 [ 716.532022][ T1647] ? io_schedule_timeout+0x140/0x140 [ 716.539630][ T1647] ? _raw_spin_unlock_irq+0x1f/0x40 [ 716.546847][ T1647] ? lockdep_hardirqs_on+0x79/0x100 [ 716.552578][ T1647] schedule+0xcf/0x270 [ 716.558598][ T1647] schedule_preempt_disabled+0xf/0x20 [ 716.565610][ T1647] __mutex_lock+0x81a/0x1110 [ 716.570448][ T1647] ? addrconf_verify_work+0xa/0x20 [ 716.578190][ T1647] ? mutex_lock_io_nested+0xf60/0xf60 [ 716.583887][ T1647] ? lock_release+0x710/0x710 [ 716.591365][ T1647] ? lock_downgrade+0x6d0/0x6d0 [ 716.597831][ T1647] addrconf_verify_work+0xa/0x20 [ 716.603492][ T1647] process_one_work+0x98d/0x15f0 [ 716.613782][ T1647] ? pwq_dec_nr_in_flight+0x320/0x320 [ 716.622099][ T1647] ? rwlock_bug.part.0+0x90/0x90 [ 716.628340][ T1647] ? _raw_spin_lock_irq+0x41/0x50 [ 716.635609][ T1647] worker_thread+0x64c/0x1120 [ 716.640756][ T1647] ? __kthread_parkme+0x13f/0x1e0 [ 716.647717][ T1647] ? process_one_work+0x15f0/0x15f0 [ 716.653440][ T1647] kthread+0x3b1/0x4a0 [ 716.659819][ T1647] ? __kthread_bind_mask+0xc0/0xc0 [ 716.666649][ T1647] ret_from_fork+0x1f/0x30 [ 716.671781][ T1647] [ 716.671781][ T1647] Showing all locks held in the system: [ 716.681403][ T1647] 1 lock held by khungtaskd/1647: [ 716.688117][ T1647] #0: ffffffff8bd73da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 716.702352][ T1647] 3 locks held by kworker/1:3/4908: [ 716.709181][ T1647] #0: ffff888021873938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 716.722579][ T1647] #1: ffffc900011efda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 716.735999][ T1647] #2: ffffffff8d4590e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 716.750359][ T1647] 1 lock held by in:imklog/8182: [ 716.758898][ T1647] #0: ffff888012fbeaf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 716.774916][ T1647] 2 locks held by syz-executor181/8506: [ 716.789594][ T1647] [ 716.792199][ T1647] ============================================= [ 716.792199][ T1647] [ 716.804484][ T1647] NMI backtrace for cpu 1 [ 716.810568][ T1647] CPU: 1 PID: 1647 Comm: khungtaskd Not tainted 5.11.0-rc6-syzkaller #0 [ 716.819720][ T1647] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.831164][ T1647] Call Trace: [ 716.835073][ T1647] dump_stack+0x107/0x163 [ 716.840003][ T1647] nmi_cpu_backtrace.cold+0x44/0xd7 [ 716.846174][ T1647] ? lapic_can_unplug_cpu+0x80/0x80 [ 716.851657][ T1647] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 716.858088][ T1647] watchdog+0xd43/0xfa0 [ 716.862467][ T1647] ? reset_hung_task_detector+0x30/0x30 [ 716.868953][ T1647] kthread+0x3b1/0x4a0 [ 716.873139][ T1647] ? __kthread_bind_mask+0xc0/0xc0 [ 716.879008][ T1647] ret_from_fork+0x1f/0x30 [ 716.883717][ T1647] Sending NMI from CPU 1 to CPUs 0: [ 716.890336][ C0] NMI backtrace for cpu 0 [ 716.890347][ C0] CPU: 0 PID: 8506 Comm: syz-executor181 Not tainted 5.11.0-rc6-syzkaller #0 [ 716.890356][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 716.890366][ C0] RIP: 0010:__radix_tree_lookup+0x132/0x2a0 [ 716.890377][ C0] Code: 02 0f 85 95 00 00 00 e8 9c b7 99 fd 4c 89 e3 49 c1 ec 03 41 0f b6 04 2c 48 83 e3 fd 84 c0 74 06 0f 8e 1a 01 00 00 44 0f b6 2b 3f 00 00 00 44 89 ee e8 f1 bd 99 fd 41 80 fd 3f 0f 87 b7 a0 ee [ 716.890391][ C0] RSP: 0018:ffffc900011fedb0 EFLAGS: 00000246 [ 716.890404][ C0] RAX: 0000000000000000 RBX: ffff888011044000 RCX: 0000000000000000 [ 716.890412][ C0] RDX: ffff88801200b780 RSI: ffffffff83d90654 RDI: 0000000000000003 [ 716.890421][ C0] RBP: dffffc0000000000 R08: 0000000000000002 R09: 0000000000000012 [ 716.890430][ C0] R10: ffffffff83d90645 R11: 0000000000000000 R12: 1ffff11002208800 [ 716.890438][ C0] R13: 000000000000000c R14: 0000000080000000 R15: ffff8880110445a8 [ 716.890447][ C0] FS: 0000000001bb2300(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 [ 716.890455][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 716.890463][ C0] CR2: 0000000020000280 CR3: 000000001496d000 CR4: 00000000001506f0 [ 716.890471][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 716.890479][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 716.890486][ C0] Call Trace: [ 716.890491][ C0] tcf_idr_check_alloc+0xb0/0x3b0 [ 716.890496][ C0] tcf_police_init+0x34f/0x1460 [ 716.890502][ C0] ? tcf_police_cleanup+0x60/0x60 [ 716.890507][ C0] ? find_held_lock+0x2d/0x110 [ 716.890513][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 716.890519][ C0] tcf_action_init_1+0x1a3/0x990 [ 716.890524][ C0] ? tcf_action_dump_old+0x80/0x80 [ 716.890530][ C0] ? lock_downgrade+0x6d0/0x6d0 [ 716.890536][ C0] ? find_held_lock+0x2d/0x110 [ 716.890541][ C0] ? __mutex_unlock_slowpath+0xe2/0x610 [ 716.890547][ C0] ? wait_for_completion_io+0x260/0x260 [ 716.890553][ C0] tcf_exts_validate+0x138/0x420 [ 716.890559][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 716.890564][ C0] basic_change+0x47a/0x1310 [ 716.890570][ C0] ? basic_delete+0x680/0x680 [ 716.890575][ C0] tc_new_tfilter+0x1394/0x2120 [ 716.890580][ C0] ? basic_delete+0x680/0x680 [ 716.890586][ C0] ? tc_del_tfilter+0x15b0/0x15b0 [ 716.890591][ C0] ? lock_chain_count+0x20/0x20 [ 716.890597][ C0] ? kernel_text_address+0xbd/0xf0 [ 716.890602][ C0] ? tc_del_tfilter+0x15b0/0x15b0 [ 716.890608][ C0] rtnetlink_rcv_msg+0x80e/0xad0 [ 716.890614][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 716.890620][ C0] netlink_rcv_skb+0x153/0x420 [ 716.890625][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 716.890631][ C0] ? netlink_ack+0xaa0/0xaa0 [ 716.890637][ C0] ? netlink_deliver_tap+0x227/0xb70 [ 716.890642][ C0] netlink_unicast+0x533/0x7d0 [ 716.890648][ C0] ? netlink_attachskb+0x870/0x870 [ 716.890654][ C0] ? _copy_from_iter_full+0x275/0x850 [ 716.890660][ C0] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 716.890666][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 716.890672][ C0] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 716.890678][ C0] ? __check_object_size+0x171/0x3f0 [ 716.890684][ C0] netlink_sendmsg+0x856/0xd90 [ 716.890690][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 716.890696][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 716.890702][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 716.890707][ C0] sock_sendmsg+0xcf/0x120 [ 716.890713][ C0] ____sys_sendmsg+0x331/0x810 [ 716.890718][ C0] ? kernel_sendmsg+0x50/0x50 [ 716.890723][ C0] ? do_recvmmsg+0x6c0/0x6c0 [ 716.890729][ C0] ? __lock_acquire+0x16c2/0x54f0 [ 716.890734][ C0] ___sys_sendmsg+0xf3/0x170 [ 716.890740][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 716.890745][ C0] ? find_held_lock+0x2d/0x110 [ 716.890751][ C0] ? __might_fault+0xd3/0x180 [ 716.890756][ C0] ? lock_downgrade+0x6d0/0x6d0 [ 716.890762][ C0] __sys_sendmmsg+0x195/0x470 [ 716.890767][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 716.890778][ C0] ? find_held_lock+0x2d/0x110 [ 716.890783][ C0] ? alloc_file_pseudo+0x1/0x250 [ 716.890789][ C0] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 716.890795][ C0] ? fd_install+0x215/0x640 [ 716.890800][ C0] ? __sys_socket+0x16d/0x200 [ 716.890806][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 716.890812][ C0] ? syscall_enter_from_user_mode+0x1d/0x50 [ 716.890818][ C0] do_syscall_64+0x2d/0x70 [ 716.890823][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 716.890829][ C0] RIP: 0033:0x440229 [ 716.890839][ C0] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 [ 716.890853][ C0] RSP: 002b:00007ffc63c63e48 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 716.890867][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000440229 [ 716.890875][ C0] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 716.890884][ C0] RBP: 0000000000000000 R08: 00000000004ab000 R09: 00000000004ab000 [ 716.890892][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000007b41e [ 716.890901][ C0] R13: 00007ffc63c63e70 R14: 00007ffc63c63e60 R15: 00007ffc63c63e54 [ 716.890910][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.210 msecs [ 716.924025][ T1647] Kernel panic - not syncing: hung_task: blocked tasks [ 717.493641][ T1647] CPU: 1 PID: 1647 Comm: khungtaskd Not tainted 5.11.0-rc6-syzkaller #0 [ 717.501988][ T1647] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 717.512414][ T1647] Call Trace: [ 717.516067][ T1647] dump_stack+0x107/0x163 [ 717.520865][ T1647] panic+0x306/0x73d [ 717.525555][ T1647] ? __warn_printk+0xf3/0xf3 [ 717.530330][ T1647] ? lapic_can_unplug_cpu+0x80/0x80 [ 717.535591][ T1647] ? preempt_schedule_thunk+0x16/0x18 [ 717.541204][ T1647] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 717.547422][ T1647] ? watchdog.cold+0x5/0x158 [ 717.552109][ T1647] watchdog.cold+0x16/0x158 [ 717.556655][ T1647] ? reset_hung_task_detector+0x30/0x30 [ 717.562590][ T1647] kthread+0x3b1/0x4a0 [ 717.566693][ T1647] ? __kthread_bind_mask+0xc0/0xc0 [ 717.571821][ T1647] ret_from_fork+0x1f/0x30 [ 717.577583][ T1647] Kernel Offset: disabled [ 717.582174][ T1647] Rebooting in 86400 seconds..