Warning: Permanently added '10.128.0.44' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 504.610252][ T8445] IPVS: ftp: loaded support on port[0] = 21 [ 721.384829][ T1638] INFO: task kworker/0:2:3006 blocked for more than 143 seconds. [ 721.392797][ T1638] Not tainted 5.11.0-rc6-syzkaller #0 [ 721.401044][ T1638] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 721.410506][ T1638] task:kworker/0:2 state:D stack:29232 pid: 3006 ppid: 2 flags:0x00004000 [ 721.420594][ T1638] Workqueue: ipv6_addrconf addrconf_verify_work [ 721.427893][ T1638] Call Trace: [ 721.431274][ T1638] __schedule+0x90c/0x21a0 [ 721.436954][ T1638] ? io_schedule_timeout+0x140/0x140 [ 721.442283][ T1638] ? _raw_spin_unlock_irq+0x1f/0x40 [ 721.448766][ T1638] ? lockdep_hardirqs_on+0x79/0x100 [ 721.454058][ T1638] schedule+0xcf/0x270 [ 721.459506][ T1638] schedule_preempt_disabled+0xf/0x20 [ 721.466863][ T1638] __mutex_lock+0x81a/0x1110 [ 721.471498][ T1638] ? addrconf_verify_work+0xa/0x20 [ 721.477871][ T1638] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.483297][ T1638] ? lock_release+0x710/0x710 [ 721.489544][ T1638] ? lock_downgrade+0x6d0/0x6d0 [ 721.494469][ T1638] addrconf_verify_work+0xa/0x20 [ 721.500669][ T1638] process_one_work+0x98d/0x15f0 [ 721.506639][ T1638] ? pwq_dec_nr_in_flight+0x320/0x320 [ 721.512161][ T1638] ? rwlock_bug.part.0+0x90/0x90 [ 721.518481][ T1638] ? _raw_spin_lock_irq+0x41/0x50 [ 721.523564][ T1638] worker_thread+0x64c/0x1120 [ 721.529496][ T1638] ? __kthread_parkme+0x13f/0x1e0 [ 721.534628][ T1638] ? process_one_work+0x15f0/0x15f0 [ 721.541032][ T1638] kthread+0x3b1/0x4a0 [ 721.545956][ T1638] ? __kthread_bind_mask+0xc0/0xc0 [ 721.551107][ T1638] ret_from_fork+0x1f/0x30 [ 721.557682][ T1638] [ 721.557682][ T1638] Showing all locks held in the system: [ 721.566188][ T1638] 1 lock held by khungtaskd/1638: [ 721.571237][ T1638] #0: ffffffff8bd73d20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 721.583507][ T1638] 3 locks held by kworker/0:2/3006: [ 721.589467][ T1638] #0: ffff888147adc538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 721.602460][ T1638] #1: ffffc90001767da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 721.613578][ T1638] #2: ffffffff8d45a5c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 721.623837][ T1638] 1 lock held by in:imklog/8166: [ 721.629635][ T1638] #0: ffff8880133be5f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 721.639704][ T1638] 1 lock held by syz-executor206/8467: [ 721.645944][ T1638] [ 721.648292][ T1638] ============================================= [ 721.648292][ T1638] [ 721.658194][ T1638] NMI backtrace for cpu 0 [ 721.662540][ T1638] CPU: 0 PID: 1638 Comm: khungtaskd Not tainted 5.11.0-rc6-syzkaller #0 [ 721.670896][ T1638] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.680972][ T1638] Call Trace: [ 721.684288][ T1638] dump_stack+0x107/0x163 [ 721.688723][ T1638] nmi_cpu_backtrace.cold+0x44/0xd7 [ 721.693948][ T1638] ? lapic_can_unplug_cpu+0x80/0x80 [ 721.699221][ T1638] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 721.705306][ T1638] watchdog+0xd43/0xfa0 [ 721.709550][ T1638] ? reset_hung_task_detector+0x30/0x30 [ 721.715121][ T1638] kthread+0x3b1/0x4a0 [ 721.719203][ T1638] ? __kthread_bind_mask+0xc0/0xc0 [ 721.724336][ T1638] ret_from_fork+0x1f/0x30 [ 721.728988][ T1638] Sending NMI from CPU 0 to CPUs 1: [ 721.735844][ C1] NMI backtrace for cpu 1 [ 721.735856][ C1] CPU: 1 PID: 8467 Comm: syz-executor206 Not tainted 5.11.0-rc6-syzkaller #0 [ 721.735867][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 721.735876][ C1] RIP: 0010:preempt_count_sub+0x5f/0x150 [ 721.735888][ C1] Code: 72 0e 85 c9 75 1b 65 8b 05 0e 76 b4 7e 89 c2 81 e2 ff ff ff 7f 39 da 7c 13 81 fb fe 00 00 00 76 63 f7 db 65 01 1d f1 75 b4 7e <5b> c3 e8 0a 98 ae 07 85 c0 74 f5 48 c7 c0 18 fc a3 8d 48 ba 00 00 [ 721.735904][ C1] RSP: 0018:ffffc90001256ca8 EFLAGS: 00000297 [ 721.735918][ C1] RAX: 0000000080000001 RBX: 00000000ffffffff RCX: 0000000000000000 [ 721.735928][ C1] RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000001 [ 721.735937][ C1] RBP: ffff88801bfcf800 R08: 0000000000000001 R09: ffff88801bfcf807 [ 721.735946][ C1] R10: ffffed10037f9f00 R11: 0000000000000001 R12: fffffbfff1b47f83 [ 721.735955][ C1] R13: ffff888017995340 R14: dffffc0000000000 R15: 0000000000000000 [ 721.735964][ C1] FS: 000000000173a300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 721.735974][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 721.735982][ C1] CR2: 0000000020000280 CR3: 0000000013e87000 CR4: 00000000001506e0 [ 721.735991][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 721.736000][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 721.736008][ C1] Call Trace: [ 721.736013][ C1] __mutex_lock+0x61b/0x1110 [ 721.736020][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 721.736026][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 721.736033][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 721.736040][ C1] ? wait_for_completion_io+0x260/0x260 [ 721.736047][ C1] ? __radix_tree_lookup+0x211/0x2a0 [ 721.736054][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 721.736060][ C1] tcf_police_init+0x34f/0x1470 [ 721.736067][ C1] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 721.736074][ C1] ? tcf_police_cleanup+0x60/0x60 [ 721.736080][ C1] ? find_held_lock+0x2d/0x110 [ 721.736087][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.736093][ C1] ? __sanitizer_cov_trace_cmp4+0x1c/0x70 [ 721.736100][ C1] ? pcpu_next_md_free_region+0xfe/0x370 [ 721.736107][ C1] tcf_action_init_1+0x103/0x650 [ 721.736114][ C1] ? tc_action_load_ops+0x460/0x460 [ 721.736120][ C1] ? tcf_action_dump_old+0x80/0x80 [ 721.736127][ C1] ? find_held_lock+0x2d/0x110 [ 721.736133][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 721.736140][ C1] tcf_exts_validate+0x1d7/0x540 [ 721.736146][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 721.736153][ C1] basic_change+0x47a/0x13d0 [ 721.736159][ C1] ? basic_bind_class+0x2c0/0x2c0 [ 721.736166][ C1] ? basic_bind_class+0x2c0/0x2c0 [ 721.736172][ C1] tc_new_tfilter+0xa06/0x21c0 [ 721.736178][ C1] ? tc_del_tfilter+0x1740/0x1740 [ 721.736185][ C1] ? lock_chain_count+0x20/0x20 [ 721.736191][ C1] ? kernel_text_address+0xbd/0xf0 [ 721.736198][ C1] ? tc_del_tfilter+0x1740/0x1740 [ 721.736204][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 721.736211][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.736217][ C1] netlink_rcv_skb+0x153/0x420 [ 721.736224][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 721.736231][ C1] ? netlink_ack+0xaa0/0xaa0 [ 721.736237][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 721.736244][ C1] netlink_unicast+0x533/0x7d0 [ 721.736251][ C1] ? netlink_attachskb+0x870/0x870 [ 721.736258][ C1] ? _copy_from_iter_full+0x275/0x850 [ 721.736266][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 721.736274][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 721.736281][ C1] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 721.736288][ C1] ? __check_object_size+0x171/0x3f0 [ 721.736295][ C1] netlink_sendmsg+0x856/0xd90 [ 721.736302][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.736309][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.736324][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 721.736331][ C1] sock_sendmsg+0xcf/0x120 [ 721.736337][ C1] ____sys_sendmsg+0x331/0x810 [ 721.736344][ C1] ? kernel_sendmsg+0x50/0x50 [ 721.736351][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 721.736357][ C1] ? __lock_acquire+0x16c2/0x54f0 [ 721.736364][ C1] ___sys_sendmsg+0xf3/0x170 [ 721.736371][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 721.736378][ C1] ? find_held_lock+0x2d/0x110 [ 721.736384][ C1] ? __might_fault+0xd3/0x180 [ 721.736391][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 721.736398][ C1] __sys_sendmmsg+0x195/0x470 [ 721.736405][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 721.736412][ C1] ? find_held_lock+0x2d/0x110 [ 721.736418][ C1] ? alloc_file_pseudo+0x1/0x250 [ 721.736426][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 721.736433][ C1] ? fd_install+0x215/0x640 [ 721.736440][ C1] ? __sys_socket+0x16d/0x200 [ 721.736447][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 721.736454][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 721.736461][ C1] do_syscall_64+0x2d/0x70 [ 721.736467][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 721.736473][ C1] RIP: 0033:0x440229 [ 721.736481][ C1] 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 [ 721.736491][ C1] RSP: 002b:00007ffe1e07e958 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 721.736500][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000440229 [ 721.736506][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 721.736512][ C1] RBP: 0000000000000000 R08: 00000000004ab000 R09: 00000000004ab000 [ 721.736517][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000007b37e [ 721.736523][ C1] R13: 00007ffe1e07e980 R14: 00007ffe1e07e970 R15: 00007ffe1e07e964 [ 721.736529][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.570 msecs [ 721.754791][ T1638] Kernel panic - not syncing: hung_task: blocked tasks [ 722.307964][ T1638] CPU: 0 PID: 1638 Comm: khungtaskd Not tainted 5.11.0-rc6-syzkaller #0 [ 722.316313][ T1638] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 722.326832][ T1638] Call Trace: [ 722.330131][ T1638] dump_stack+0x107/0x163 [ 722.334582][ T1638] panic+0x306/0x73d [ 722.338517][ T1638] ? __warn_printk+0xf3/0xf3 [ 722.343153][ T1638] ? lapic_can_unplug_cpu+0x80/0x80 [ 722.348386][ T1638] ? preempt_schedule_thunk+0x16/0x18 [ 722.353791][ T1638] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 722.359972][ T1638] ? watchdog.cold+0x5/0x158 [ 722.364632][ T1638] watchdog.cold+0x16/0x158 [ 722.369172][ T1638] ? reset_hung_task_detector+0x30/0x30 [ 722.374747][ T1638] kthread+0x3b1/0x4a0 [ 722.378834][ T1638] ? __kthread_bind_mask+0xc0/0xc0 [ 722.383963][ T1638] ret_from_fork+0x1f/0x30 [ 722.389125][ T1638] Kernel Offset: disabled [ 722.393594][ T1638] Rebooting in 86400 seconds..