Warning: Permanently added '10.128.0.195' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 628.479535][ T8436] IPVS: ftp: loaded support on port[0] = 21 [ 799.194770][ T8460] cron (8460) used greatest stack depth: 22696 bytes left [ 864.797494][ T1656] INFO: task kworker/0:1:7 blocked for more than 143 seconds. [ 864.805200][ T1656] Not tainted 5.11.0-rc6-syzkaller #0 [ 864.815028][ T1656] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 864.824639][ T1656] task:kworker/0:1 state:D stack:28200 pid: 7 ppid: 2 flags:0x00004000 [ 864.834945][ T1656] Workqueue: ipv6_addrconf addrconf_verify_work [ 864.842269][ T1656] Call Trace: [ 864.845609][ T1656] __schedule+0x90c/0x21a0 [ 864.852515][ T1656] ? io_schedule_timeout+0x140/0x140 [ 864.858779][ T1656] ? _raw_spin_unlock_irq+0x1f/0x40 [ 864.864011][ T1656] ? lockdep_hardirqs_on+0x79/0x100 [ 864.870557][ T1656] schedule+0xcf/0x270 [ 864.874670][ T1656] schedule_preempt_disabled+0xf/0x20 [ 864.881484][ T1656] __mutex_lock+0x81a/0x1110 [ 864.886124][ T1656] ? addrconf_verify_work+0xa/0x20 [ 864.892543][ T1656] ? mutex_lock_io_nested+0xf60/0xf60 [ 864.898902][ T1656] ? lock_release+0x710/0x710 [ 864.903697][ T1656] ? lock_downgrade+0x6d0/0x6d0 [ 864.909906][ T1656] addrconf_verify_work+0xa/0x20 [ 864.914873][ T1656] process_one_work+0x98d/0x15f0 [ 864.921283][ T1656] ? pwq_dec_nr_in_flight+0x320/0x320 [ 864.926694][ T1656] ? rwlock_bug.part.0+0x90/0x90 [ 864.933007][ T1656] ? _raw_spin_lock_irq+0x41/0x50 [ 864.939026][ T1656] worker_thread+0x64c/0x1120 [ 864.943791][ T1656] ? process_one_work+0x15f0/0x15f0 [ 864.950462][ T1656] kthread+0x3b1/0x4a0 [ 864.954559][ T1656] ? __kthread_bind_mask+0xc0/0xc0 [ 864.960988][ T1656] ret_from_fork+0x1f/0x30 [ 864.965686][ T1656] [ 864.965686][ T1656] Showing all locks held in the system: [ 864.974796][ T1656] 3 locks held by kworker/0:1/7: [ 864.981935][ T1656] #0: ffff888147817138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 [ 864.993914][ T1656] #1: ffffc90000cc7da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 [ 865.006051][ T1656] #2: ffffffff8d4590e8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 865.016453][ T1656] 1 lock held by khungtaskd/1656: [ 865.022669][ T1656] #0: ffffffff8bd73da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 865.033507][ T1656] 1 lock held by in:imklog/8159: [ 865.039356][ T1656] #0: ffff88802599c0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 865.049471][ T1656] 2 locks held by syz-executor983/8458: [ 865.055053][ T1656] [ 865.057379][ T1656] ============================================= [ 865.057379][ T1656] [ 865.067665][ T1656] NMI backtrace for cpu 0 [ 865.072031][ T1656] CPU: 0 PID: 1656 Comm: khungtaskd Not tainted 5.11.0-rc6-syzkaller #0 [ 865.080365][ T1656] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.090424][ T1656] Call Trace: [ 865.093710][ T1656] dump_stack+0x107/0x163 [ 865.098112][ T1656] nmi_cpu_backtrace.cold+0x44/0xd7 [ 865.103327][ T1656] ? lapic_can_unplug_cpu+0x80/0x80 [ 865.108583][ T1656] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 865.114645][ T1656] watchdog+0xd43/0xfa0 [ 865.118881][ T1656] ? reset_hung_task_detector+0x30/0x30 [ 865.124444][ T1656] kthread+0x3b1/0x4a0 [ 865.128523][ T1656] ? __kthread_bind_mask+0xc0/0xc0 [ 865.133648][ T1656] ret_from_fork+0x1f/0x30 [ 865.138242][ T1656] Sending NMI from CPU 0 to CPUs 1: [ 865.144781][ C1] NMI backtrace for cpu 1 [ 865.144791][ C1] CPU: 1 PID: 8458 Comm: syz-executor983 Not tainted 5.11.0-rc6-syzkaller #0 [ 865.144801][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.144811][ C1] RIP: 0010:rcu_is_watching+0x63/0xc0 [ 865.144822][ C1] Code: 80 3c 02 00 75 5b 48 03 1c ed c0 f6 e6 8a 48 b8 00 00 00 00 00 fc ff df 48 8d bb 28 01 00 00 48 89 fa 48 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 [ 865.144838][ C1] RSP: 0018:ffffc9000949eb88 EFLAGS: 00000a02 [ 865.144850][ C1] RAX: dffffc0000000000 RBX: ffff8880b9d35a80 RCX: ffffffff8158c388 [ 865.144859][ C1] RDX: 0000000000000000 RSI: 0000000000000003 RDI: ffff8880b9d35ba8 [ 865.144867][ C1] RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8da38a4f [ 865.144876][ C1] R10: fffffbfff1b47149 R11: 0000000000000000 R12: 0000000000000001 [ 865.144885][ C1] R13: ffff8880130d8868 R14: 0000000000000000 R15: 0000000000000000 [ 865.144894][ C1] FS: 000000000075b300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 865.144902][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 865.144910][ C1] CR2: 00007fbd97c9e000 CR3: 000000001ceaf000 CR4: 00000000001506e0 [ 865.144919][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 865.144927][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 865.144934][ C1] Call Trace: [ 865.144939][ C1] rcu_read_lock_sched_held+0x1c/0x70 [ 865.144945][ C1] lock_acquire+0x5d2/0x720 [ 865.144950][ C1] ? lock_release+0x710/0x710 [ 865.144956][ C1] ? preempt_schedule_notrace_thunk+0x16/0x18 [ 865.144962][ C1] __mutex_lock+0x134/0x1110 [ 865.144968][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 865.144974][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 865.144980][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 865.144986][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 865.144992][ C1] ? wait_for_completion_io+0x260/0x260 [ 865.144998][ C1] ? tcf_idr_check_alloc+0xc2/0x3b0 [ 865.145004][ C1] ? __radix_tree_lookup+0x211/0x2a0 [ 865.145010][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 865.145016][ C1] tcf_police_init+0x34f/0x1460 [ 865.145021][ C1] ? tcf_police_cleanup+0x60/0x60 [ 865.145027][ C1] ? find_held_lock+0x2d/0x110 [ 865.145033][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 865.145038][ C1] tcf_action_init_1+0x1a3/0x990 [ 865.145044][ C1] ? tcf_action_dump_old+0x80/0x80 [ 865.145050][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 865.145056][ C1] ? find_held_lock+0x2d/0x110 [ 865.145062][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 865.145068][ C1] ? wait_for_completion_io+0x260/0x260 [ 865.145074][ C1] tcf_exts_validate+0x138/0x420 [ 865.145080][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 865.145085][ C1] basic_change+0x47a/0x1310 [ 865.145091][ C1] ? basic_delete+0x680/0x680 [ 865.145096][ C1] tc_new_tfilter+0x1394/0x2120 [ 865.145102][ C1] ? basic_delete+0x680/0x680 [ 865.145107][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 865.145113][ C1] ? lock_chain_count+0x20/0x20 [ 865.145118][ C1] ? kernel_text_address+0xbd/0xf0 [ 865.145124][ C1] ? tc_del_tfilter+0x15b0/0x15b0 [ 865.145130][ C1] rtnetlink_rcv_msg+0x80e/0xad0 [ 865.145136][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 865.145142][ C1] netlink_rcv_skb+0x153/0x420 [ 865.145148][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 865.145154][ C1] ? netlink_ack+0xaa0/0xaa0 [ 865.145159][ C1] ? netlink_deliver_tap+0x227/0xb70 [ 865.145165][ C1] netlink_unicast+0x533/0x7d0 [ 865.145171][ C1] ? netlink_attachskb+0x870/0x870 [ 865.145176][ C1] ? _copy_from_iter_full+0x275/0x850 [ 865.145183][ C1] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 865.145189][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 865.145195][ C1] ? __sanitizer_cov_trace_cmp8+0x1d/0x70 [ 865.145202][ C1] ? __check_object_size+0x171/0x3f0 [ 865.145208][ C1] netlink_sendmsg+0x856/0xd90 [ 865.145213][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 865.145225][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 865.145231][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 865.145237][ C1] sock_sendmsg+0xcf/0x120 [ 865.145242][ C1] ____sys_sendmsg+0x331/0x810 [ 865.145248][ C1] ? kernel_sendmsg+0x50/0x50 [ 865.145253][ C1] ? do_recvmmsg+0x6c0/0x6c0 [ 865.145258][ C1] ? __lock_acquire+0x16c2/0x54f0 [ 865.145264][ C1] ___sys_sendmsg+0xf3/0x170 [ 865.145269][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 865.145275][ C1] ? find_held_lock+0x2d/0x110 [ 865.145281][ C1] ? __might_fault+0xd3/0x180 [ 865.145286][ C1] ? lock_downgrade+0x6d0/0x6d0 [ 865.145291][ C1] __sys_sendmmsg+0x195/0x470 [ 865.145297][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 865.145303][ C1] ? find_held_lock+0x2d/0x110 [ 865.145308][ C1] ? alloc_file_pseudo+0x1/0x250 [ 865.145314][ C1] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 865.145321][ C1] ? fd_install+0x215/0x640 [ 865.145326][ C1] ? __sys_socket+0x16d/0x200 [ 865.145332][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 865.145338][ C1] ? syscall_enter_from_user_mode+0x1d/0x50 [ 865.145344][ C1] do_syscall_64+0x2d/0x70 [ 865.145349][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 865.145355][ C1] RIP: 0033:0x440229 [ 865.145365][ 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 [ 865.145381][ C1] RSP: 002b:00007ffe8cbef1e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 865.145395][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000440229 [ 865.145403][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 865.145412][ C1] RBP: 0000000000000000 R08: 00000000004ab000 R09: 00000000004ab000 [ 865.145421][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000009975c [ 865.145430][ C1] R13: 00007ffe8cbef210 R14: 00007ffe8cbef200 R15: 00007ffe8cbef1f4 [ 865.145440][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.284 msecs [ 865.148003][ T1656] Kernel panic - not syncing: hung_task: blocked tasks [ 865.727432][ T1656] CPU: 0 PID: 1656 Comm: khungtaskd Not tainted 5.11.0-rc6-syzkaller #0 [ 865.735769][ T1656] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 865.745828][ T1656] Call Trace: [ 865.749134][ T1656] dump_stack+0x107/0x163 [ 865.753497][ T1656] panic+0x306/0x73d [ 865.757468][ T1656] ? __warn_printk+0xf3/0xf3 [ 865.762075][ T1656] ? lapic_can_unplug_cpu+0x80/0x80 [ 865.767284][ T1656] ? preempt_schedule_thunk+0x16/0x18 [ 865.772667][ T1656] ? nmi_trigger_cpumask_backtrace+0x196/0x230 [ 865.778839][ T1656] ? watchdog.cold+0x5/0x158 [ 865.783491][ T1656] watchdog.cold+0x16/0x158 [ 865.788011][ T1656] ? reset_hung_task_detector+0x30/0x30 [ 865.793575][ T1656] kthread+0x3b1/0x4a0 [ 865.797657][ T1656] ? __kthread_bind_mask+0xc0/0xc0 [ 865.802784][ T1656] ret_from_fork+0x1f/0x30 [ 865.807987][ T1656] Kernel Offset: disabled [ 865.812326][ T1656] Rebooting in 86400 seconds..