Warning: Permanently added '10.128.0.68' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 502.782564][ T6880] IPVS: ftp: loaded support on port[0] = 21 [ 657.171107][ T1088] INFO: task kworker/0:4:6563 blocked for more than 143 seconds. [ 657.179000][ T1088] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.188536][ T1088] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.198024][ T1088] task:kworker/0:4 state:D stack:29136 pid: 6563 ppid: 2 flags:0x00004000 [ 657.209366][ T1088] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.216388][ T1088] Call Trace: [ 657.219718][ T1088] __schedule+0xec9/0x2280 [ 657.225314][ T1088] ? io_schedule_timeout+0x140/0x140 [ 657.230680][ T1088] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.238851][ T1088] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.244795][ T1088] ? lockdep_hardirqs_on+0x53/0x100 [ 657.250021][ T1088] schedule+0xd0/0x2a0 [ 657.255243][ T1088] schedule_preempt_disabled+0xf/0x20 [ 657.260618][ T1088] __mutex_lock+0x3e2/0x10e0 [ 657.266300][ T1088] ? addrconf_verify_work+0xa/0x20 [ 657.272166][ T1088] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.277553][ T1088] ? lock_release+0x8f0/0x8f0 [ 657.283367][ T1088] ? lock_downgrade+0x830/0x830 [ 657.288228][ T1088] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.294713][ T1088] ? lock_is_held_type+0xbb/0xf0 [ 657.299673][ T1088] addrconf_verify_work+0xa/0x20 [ 657.305773][ T1088] process_one_work+0x94c/0x1670 [ 657.310721][ T1088] ? lock_release+0x8f0/0x8f0 [ 657.316532][ T1088] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.322606][ T1088] ? rwlock_bug.part.0+0x90/0x90 [ 657.327549][ T1088] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.334972][ T1088] worker_thread+0x64c/0x1120 [ 657.339726][ T1088] ? __kthread_parkme+0x13f/0x1e0 [ 657.345904][ T1088] ? process_one_work+0x1670/0x1670 [ 657.351878][ T1088] kthread+0x3b5/0x4a0 [ 657.355952][ T1088] ? __kthread_bind_mask+0xc0/0xc0 [ 657.362223][ T1088] ret_from_fork+0x1f/0x30 [ 657.366721][ T1088] [ 657.366721][ T1088] Showing all locks held in the system: [ 657.375623][ T1088] 1 lock held by khungtaskd/1088: [ 657.380647][ T1088] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.392489][ T1088] 1 lock held by in:imklog/6561: [ 657.397419][ T1088] #0: ffff8880a6e8a3f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.407758][ T1088] 3 locks held by kworker/0:4/6563: [ 657.414004][ T1088] #0: ffff88809abcb138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.425677][ T1088] #1: ffffc9000a3ffda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.436832][ T1088] #2: ffffffff8b14f108 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.447048][ T1088] 1 lock held by syz-executor888/6902: [ 657.453330][ T1088] [ 657.455657][ T1088] ============================================= [ 657.455657][ T1088] [ 657.467229][ T1088] NMI backtrace for cpu 0 [ 657.471646][ T1088] CPU: 0 PID: 1088 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.479870][ T1088] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.489912][ T1088] Call Trace: [ 657.493285][ T1088] dump_stack+0x198/0x1fd [ 657.497623][ T1088] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.502918][ T1088] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.508547][ T1088] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.514557][ T1088] watchdog+0xd7d/0x1000 [ 657.518803][ T1088] ? reset_hung_task_detector+0x30/0x30 [ 657.524426][ T1088] kthread+0x3b5/0x4a0 [ 657.528505][ T1088] ? __kthread_bind_mask+0xc0/0xc0 [ 657.533701][ T1088] ret_from_fork+0x1f/0x30 [ 657.538277][ T1088] Sending NMI from CPU 0 to CPUs 1: [ 657.544902][ C1] NMI backtrace for cpu 1 [ 657.544908][ C1] CPU: 1 PID: 6902 Comm: syz-executor888 Not tainted 5.9.0-rc8-syzkaller #0 [ 657.544913][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.544917][ C1] RIP: 0010:rcu_lockdep_current_cpu_online+0xd4/0x120 [ 657.544928][ C1] Code: 5b 20 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 49 48 8b 45 70 48 85 c3 0f 95 c0 65 ff 0d cc 2f 9f 7e <74> 03 5b 5d c3 e8 81 aa 9d ff eb f6 48 89 ee 48 c7 c7 80 ef 06 8a [ 657.544932][ C1] RSP: 0018:ffffc90005496b88 EFLAGS: 00000282 [ 657.544939][ C1] RAX: 0000000000000001 RBX: 0000000000000002 RCX: ffffffff815c096e [ 657.544943][ C1] RDX: 1ffffffff140df5e RSI: 0000000000000003 RDI: ffffffff8a06faf0 [ 657.544948][ C1] RBP: ffffffff8a06fa80 R08: 0000000000000000 R09: ffffffff8b597ecf [ 657.544952][ C1] R10: fffffbfff16b2fd9 R11: 0000000000000000 R12: 0000000000000001 [ 657.544957][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001 [ 657.544962][ C1] FS: 0000000002592880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 657.544966][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.544971][ C1] CR2: 0000000020000280 CR3: 000000009e89e000 CR4: 00000000001506e0 [ 657.544975][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.544980][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.544982][ C1] Call Trace: [ 657.544986][ C1] rcu_read_lock_sched_held+0x25/0xb0 [ 657.544989][ C1] lock_acquire+0x843/0xaf0 [ 657.544992][ C1] ? lock_release+0x8f0/0x8f0 [ 657.544995][ C1] ? arch_local_irq_restore+0x34/0x50 [ 657.544998][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.545001][ C1] __mutex_lock+0x134/0x10e0 [ 657.545005][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.545008][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.545011][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 657.545015][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.545018][ C1] ? check_memory_region+0x48/0x180 [ 657.545021][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 657.545025][ C1] ? __radix_tree_lookup+0x16f/0x290 [ 657.545028][ C1] ? __sanitizer_cov_trace_pc+0x30/0x60 [ 657.545032][ C1] ? wait_for_completion+0x260/0x260 [ 657.545035][ C1] tcf_idr_check_alloc+0x78/0x3b0 [ 657.545038][ C1] tcf_police_init+0x347/0x13a0 [ 657.545041][ C1] ? tcf_police_cleanup+0x60/0x60 [ 657.545044][ C1] ? find_held_lock+0x2d/0x110 [ 657.545047][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 657.545051][ C1] tcf_action_init_1+0x1a3/0x990 [ 657.545054][ C1] ? tcf_action_dump_old+0x80/0x80 [ 657.545057][ C1] ? lock_downgrade+0x830/0x830 [ 657.545061][ C1] ? pcpu_next_fit_region.constprop.0+0x43c/0x4d0 [ 657.545064][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.545067][ C1] ? find_held_lock+0x2d/0x110 [ 657.545071][ C1] ? __mutex_unlock_slowpath+0xe2/0x610 [ 657.545074][ C1] ? mark_held_locks+0x9f/0xe0 [ 657.545077][ C1] ? wait_for_completion+0x260/0x260 [ 657.545080][ C1] tcf_exts_validate+0x138/0x420 [ 657.545084][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 657.545087][ C1] basic_change+0x47a/0x1300 [ 657.545090][ C1] ? basic_delete+0x680/0x680 [ 657.545093][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.545096][ C1] tc_new_tfilter+0x1398/0x2130 [ 657.545099][ C1] ? basic_delete+0x680/0x680 [ 657.545102][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.545106][ C1] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.545110][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.545113][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.545116][ C1] ? security_capable+0x8f/0xc0 [ 657.545119][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.545122][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.545126][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 657.545129][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.545132][ C1] ? lock_acquire+0x1f3/0xaf0 [ 657.545135][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 657.545139][ C1] netlink_rcv_skb+0x15a/0x430 [ 657.545142][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.545145][ C1] ? netlink_ack+0xa10/0xa10 [ 657.545149][ C1] ? __kmalloc_node_track_caller+0x38/0x60 [ 657.545152][ C1] netlink_unicast+0x533/0x7d0 [ 657.545155][ C1] ? netlink_attachskb+0x810/0x810 [ 657.545158][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 657.545161][ C1] ? __check_object_size+0x171/0x3e4 [ 657.545165][ C1] netlink_sendmsg+0x856/0xd90 [ 657.545168][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.545171][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 657.545174][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.545177][ C1] sock_sendmsg+0xcf/0x120 [ 657.545180][ C1] ____sys_sendmsg+0x331/0x810 [ 657.545184][ C1] ? kernel_sendmsg+0x50/0x50 [ 657.545187][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 657.545190][ C1] ? __lock_acquire+0x164a/0x5780 [ 657.545193][ C1] ___sys_sendmsg+0xf3/0x170 [ 657.545196][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 657.545200][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.545203][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.545206][ C1] ? find_held_lock+0x2d/0x110 [ 657.545209][ C1] ? __might_fault+0x11f/0x1d0 [ 657.545212][ C1] ? lock_downgrade+0x830/0x830 [ 657.545215][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.545219][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.545222][ C1] __sys_sendmmsg+0x195/0x480 [ 657.545225][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 657.545228][ C1] ? __might_fault+0x190/0x1d0 [ 657.545231][ C1] ? _copy_to_user+0x126/0x160 [ 657.545234][ C1] ? sockfd_lookup_light+0xc6/0x180 [ 657.545237][ C1] ? __sys_sendmsg+0x10c/0x1b0 [ 657.545241][ C1] ? __sys_sendmsg_sock+0xb0/0xb0 [ 657.545244][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.545247][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.545251][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 657.545254][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.545257][ C1] do_syscall_64+0x2d/0x70 [ 657.545261][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.545264][ C1] RIP: 0033:0x443a59 [ 657.545273][ 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 [ 657.545277][ C1] RSP: 002b:00007ffc135c8108 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 657.545285][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443a59 [ 657.545290][ C1] RDX: 010efe10675dec16 RSI: 0000000020000200 RDI: 0000000000000003 [ 657.545294][ C1] RBP: 00007ffc135c8110 R08: 0000000100000000 R09: 0000000100000000 [ 657.545299][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000007ac46 [ 657.545303][ C1] R13: 0000000000404930 R14: 0000000000000000 R15: 0000000000000000 [ 657.545309][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 657.593871][ T1088] Kernel panic - not syncing: hung_task: blocked tasks [ 658.205093][ T1088] CPU: 0 PID: 1088 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 658.213317][ T1088] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.223358][ T1088] Call Trace: [ 658.226647][ T1088] dump_stack+0x198/0x1fd [ 658.231100][ T1088] panic+0x382/0x7fb [ 658.234994][ T1088] ? __warn_printk+0xf3/0xf3 [ 658.239583][ T1088] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.245215][ T1088] ? preempt_schedule_thunk+0x16/0x18 [ 658.250580][ T1088] ? watchdog.cold+0x5/0x16b [ 658.255161][ T1088] ? watchdog+0xa82/0x1000 [ 658.259572][ T1088] watchdog.cold+0x16/0x16b [ 658.264074][ T1088] ? reset_hung_task_detector+0x30/0x30 [ 658.269637][ T1088] kthread+0x3b5/0x4a0 [ 658.273699][ T1088] ? __kthread_bind_mask+0xc0/0xc0 [ 658.278806][ T1088] ret_from_fork+0x1f/0x30 [ 658.284652][ T1088] Kernel Offset: disabled [ 658.288969][ T1088] Rebooting in 86400 seconds..