Warning: Permanently added '10.128.0.250' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 494.285558][ T6880] IPVS: ftp: loaded support on port[0] = 21 [ 657.209485][ T1178] INFO: task kworker/0:1:6872 blocked for more than 143 seconds. [ 657.217479][ T1178] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.228639][ T1178] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.238626][ T1178] task:kworker/0:1 state:D stack:29856 pid: 6872 ppid: 2 flags:0x00004000 [ 657.249100][ T1178] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.256619][ T1178] Call Trace: [ 657.261003][ T1178] __schedule+0xec9/0x2280 [ 657.265457][ T1178] ? io_schedule_timeout+0x140/0x140 [ 657.272283][ T1178] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.278322][ T1178] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.285076][ T1178] ? lockdep_hardirqs_on+0x53/0x100 [ 657.291376][ T1178] schedule+0xd0/0x2a0 [ 657.295495][ T1178] schedule_preempt_disabled+0xf/0x20 [ 657.302380][ T1178] __mutex_lock+0x3e2/0x10e0 [ 657.307040][ T1178] ? addrconf_verify_work+0xa/0x20 [ 657.314721][ T1178] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.321161][ T1178] ? lock_release+0x8f0/0x8f0 [ 657.325889][ T1178] ? lock_downgrade+0x830/0x830 [ 657.332268][ T1178] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.337499][ T1178] ? lock_is_held_type+0xbb/0xf0 [ 657.343917][ T1178] addrconf_verify_work+0xa/0x20 [ 657.351579][ T1178] process_one_work+0x94c/0x1670 [ 657.356579][ T1178] ? lock_release+0x8f0/0x8f0 [ 657.362840][ T1178] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.368255][ T1178] ? rwlock_bug.part.0+0x90/0x90 [ 657.374811][ T1178] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.381071][ T1178] worker_thread+0x64c/0x1120 [ 657.385809][ T1178] ? __kthread_parkme+0x13f/0x1e0 [ 657.392402][ T1178] ? process_one_work+0x1670/0x1670 [ 657.397645][ T1178] kthread+0x3b5/0x4a0 [ 657.403197][ T1178] ? __kthread_bind_mask+0xc0/0xc0 [ 657.408342][ T1178] ret_from_fork+0x1f/0x30 [ 657.414438][ T1178] [ 657.414438][ T1178] Showing all locks held in the system: [ 657.423307][ T1178] 1 lock held by khungtaskd/1178: [ 657.428340][ T1178] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.439883][ T1178] 1 lock held by in:imklog/6577: [ 657.445016][ T1178] #0: ffff8880a8c570f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.455775][ T1178] 3 locks held by kworker/0:1/6872: [ 657.463042][ T1178] #0: ffff888214cedd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.475421][ T1178] #1: ffffc90005717da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.487970][ T1178] #2: ffffffff8b150948 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.498450][ T1178] 2 locks held by syz-executor076/6901: [ 657.505050][ T1178] [ 657.507388][ T1178] ============================================= [ 657.507388][ T1178] [ 657.517568][ T1178] NMI backtrace for cpu 0 [ 657.522063][ T1178] CPU: 0 PID: 1178 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.530314][ T1178] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.540394][ T1178] Call Trace: [ 657.543795][ T1178] dump_stack+0x198/0x1fd [ 657.548210][ T1178] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.553422][ T1178] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.559064][ T1178] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.565059][ T1178] watchdog+0xd7d/0x1000 [ 657.569320][ T1178] ? reset_hung_task_detector+0x30/0x30 [ 657.575861][ T1178] kthread+0x3b5/0x4a0 [ 657.579936][ T1178] ? __kthread_bind_mask+0xc0/0xc0 [ 657.585060][ T1178] ret_from_fork+0x1f/0x30 [ 657.589682][ T1178] Sending NMI from CPU 0 to CPUs 1: [ 657.596514][ C1] NMI backtrace for cpu 1 [ 657.596521][ C1] CPU: 1 PID: 6901 Comm: syz-executor076 Not tainted 5.9.0-rc8-syzkaller #0 [ 657.596528][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.596533][ C1] RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 [ 657.596545][ C1] Code: 5d be 03 00 00 00 e9 46 b9 49 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 48 8b 14 25 c0 fe 01 00 <65> 8b 05 60 bf 8b 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 [ 657.596549][ C1] RSP: 0018:ffffc90005616cd0 EFLAGS: 00000286 [ 657.596559][ C1] RAX: ffffed10147d2e00 RBX: dffffc0000000000 RCX: 0000000000000000 [ 657.596564][ C1] RDX: ffff888091f44380 RSI: ffff8880a3e97000 RDI: ffff8880a8bfc490 [ 657.596570][ C1] RBP: 00000000f0000000 R08: 0000000000000000 R09: ffff8880a8bfc407 [ 657.596575][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: ffffc90005616f80 [ 657.596581][ C1] R13: 0000000000000001 R14: ffff8880a8bfc400 R15: ffff8880a8bfc490 [ 657.596587][ C1] FS: 00000000024eb880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 657.596592][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.596598][ C1] CR2: 00007fee2267f6c0 CR3: 00000000952c0000 CR4: 00000000001506e0 [ 657.596603][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.596609][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.596612][ C1] Call Trace: [ 657.596616][ C1] __radix_tree_lookup+0x81/0x290 [ 657.596620][ C1] tcf_idr_check_alloc+0xb0/0x3b0 [ 657.596624][ C1] tcf_police_init+0x347/0x13a0 [ 657.596628][ C1] ? tcf_police_cleanup+0x60/0x60 [ 657.596632][ C1] ? find_held_lock+0x2d/0x110 [ 657.596636][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 657.596640][ C1] ? mark_held_locks+0x9f/0xe0 [ 657.596645][ C1] ? check_preemption_disabled+0x50/0x130 [ 657.596649][ C1] tcf_action_init_1+0x1a3/0x990 [ 657.596653][ C1] ? tcf_action_dump_old+0x80/0x80 [ 657.596657][ C1] ? kasan_save_stack+0x32/0x40 [ 657.596661][ C1] ? kasan_save_stack+0x1b/0x40 [ 657.596665][ C1] ? __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 657.596670][ C1] ? kmem_cache_alloc_trace+0x174/0x300 [ 657.596673][ C1] ? fw_change+0x4b5/0x13e0 [ 657.596677][ C1] ? tc_new_tfilter+0x1398/0x2130 [ 657.596682][ C1] ? rtnetlink_rcv_msg+0x80f/0xad0 [ 657.596686][ C1] ? netlink_rcv_skb+0x15a/0x430 [ 657.596690][ C1] ? netlink_unicast+0x533/0x7d0 [ 657.596694][ C1] ? netlink_sendmsg+0x856/0xd90 [ 657.596697][ C1] ? sock_sendmsg+0xcf/0x120 [ 657.596702][ C1] ? ____sys_sendmsg+0x331/0x810 [ 657.596705][ C1] ? ___sys_sendmsg+0xf3/0x170 [ 657.596709][ C1] ? __sys_sendmmsg+0x195/0x480 [ 657.596714][ C1] ? __x64_sys_sendmmsg+0x99/0x100 [ 657.596717][ C1] ? do_syscall_64+0x2d/0x70 [ 657.596722][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.596726][ C1] tcf_exts_validate+0x138/0x420 [ 657.596730][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 657.596734][ C1] ? mark_lock+0x82/0x1660 [ 657.596738][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.596742][ C1] fw_set_parms+0x13d/0xa30 [ 657.596746][ C1] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 657.596750][ C1] ? fw_delete+0x8c0/0x8c0 [ 657.596754][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 657.596758][ C1] ? __nla_parse+0x3d/0x4a [ 657.596762][ C1] fw_change+0x57e/0x13e0 [ 657.596766][ C1] ? lock_downgrade+0x830/0x830 [ 657.596769][ C1] ? fw_set_parms+0xa30/0xa30 [ 657.596773][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.596777][ C1] tc_new_tfilter+0x1398/0x2130 [ 657.596781][ C1] ? fw_set_parms+0xa30/0xa30 [ 657.596785][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.596790][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.596795][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.596799][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.596803][ C1] ? security_capable+0x8f/0xc0 [ 657.596807][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.596811][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.596815][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 657.596819][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.596823][ C1] ? lock_acquire+0x1f3/0xaf0 [ 657.596827][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 657.596831][ C1] netlink_rcv_skb+0x15a/0x430 [ 657.596836][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.596839][ C1] ? netlink_ack+0xa10/0xa10 [ 657.596844][ C1] ? __kmalloc_node_track_caller+0x38/0x60 [ 657.596848][ C1] netlink_unicast+0x533/0x7d0 [ 657.596852][ C1] ? netlink_attachskb+0x810/0x810 [ 657.596856][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 657.596860][ C1] ? __check_object_size+0x171/0x3e4 [ 657.596865][ C1] netlink_sendmsg+0x856/0xd90 [ 657.596869][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.596873][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 657.596877][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.596881][ C1] sock_sendmsg+0xcf/0x120 [ 657.596885][ C1] ____sys_sendmsg+0x331/0x810 [ 657.596889][ C1] ? kernel_sendmsg+0x50/0x50 [ 657.596892][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 657.596896][ C1] ? __lock_acquire+0x164a/0x5780 [ 657.596900][ C1] ___sys_sendmsg+0xf3/0x170 [ 657.596904][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 657.596909][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.596913][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.596917][ C1] ? find_held_lock+0x2d/0x110 [ 657.596922][ C1] ? __might_fault+0x11f/0x1d0 [ 657.596926][ C1] ? lock_downgrade+0x830/0x830 [ 657.596930][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.596934][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.596938][ C1] __sys_sendmmsg+0x195/0x480 [ 657.596943][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 657.596947][ C1] ? __might_fault+0x190/0x1d0 [ 657.596951][ C1] ? _copy_to_user+0x126/0x160 [ 657.596955][ C1] ? sockfd_lookup_light+0xc6/0x180 [ 657.596959][ C1] ? __sys_sendmsg+0x10c/0x1b0 [ 657.596964][ C1] ? __sys_sendmsg_sock+0xb0/0xb0 [ 657.596968][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.596973][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.596977][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 657.596982][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.596986][ C1] do_syscall_64+0x2d/0x70 [ 657.596990][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.596994][ C1] RIP: 0033:0x441579 [ 657.597013][ 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 [ 657.597017][ C1] RSP: 002b:00007fff4aeefae8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 657.597028][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441579 [ 657.597034][ C1] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 657.597039][ C1] RBP: 00007fff4aeefaf0 R08: 0000000120080522 R09: 0000000120080522 [ 657.597045][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2930 [ 657.597051][ C1] R13: 0000000000402450 R14: 0000000000000000 R15: 0000000000000000 [ 657.597058][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 657.663536][ T1178] Kernel panic - not syncing: hung_task: blocked tasks [ 658.285713][ T1178] CPU: 0 PID: 1178 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 658.293977][ T1178] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.304075][ T1178] Call Trace: [ 658.307397][ T1178] dump_stack+0x198/0x1fd [ 658.311755][ T1178] panic+0x382/0x7fb [ 658.315658][ T1178] ? __warn_printk+0xf3/0xf3 [ 658.320385][ T1178] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.326035][ T1178] ? preempt_schedule_thunk+0x16/0x18 [ 658.331418][ T1178] ? watchdog.cold+0x5/0x16b [ 658.336011][ T1178] ? watchdog+0xa82/0x1000 [ 658.340564][ T1178] watchdog.cold+0x16/0x16b [ 658.345114][ T1178] ? reset_hung_task_detector+0x30/0x30 [ 658.350676][ T1178] kthread+0x3b5/0x4a0 [ 658.354772][ T1178] ? __kthread_bind_mask+0xc0/0xc0 [ 658.359921][ T1178] ret_from_fork+0x1f/0x30 [ 658.366063][ T1178] Kernel Offset: disabled [ 658.370413][ T1178] Rebooting in 86400 seconds..