Warning: Permanently added '10.128.0.40' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 502.229255][ T6887] IPVS: ftp: loaded support on port[0] = 21 [ 502.271474][ T6908] netlink: 8 bytes leftover after parsing attributes in process `syz-executor678'. [ 502.281727][ T6908] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor678'. [ 502.293986][ T6908] netlink: 8 bytes leftover after parsing attributes in process `syz-executor678'. [ 502.304502][ T6908] netlink: 5212 bytes leftover after parsing attributes in process `syz-executor678'. [ 657.290538][ T1175] INFO: task kworker/0:3:6784 blocked for more than 143 seconds. [ 657.298522][ T1175] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.308600][ T1175] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.318324][ T1175] task:kworker/0:3 state:D stack:29256 pid: 6784 ppid: 2 flags:0x00004000 [ 657.328683][ T1175] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.335867][ T1175] Call Trace: [ 657.339213][ T1175] __schedule+0xec9/0x2280 [ 657.346165][ T1175] ? io_schedule_timeout+0x140/0x140 [ 657.352554][ T1175] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.358609][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.365278][ T1175] ? lockdep_hardirqs_on+0x53/0x100 [ 657.371401][ T1175] schedule+0xd0/0x2a0 [ 657.375486][ T1175] schedule_preempt_disabled+0xf/0x20 [ 657.382144][ T1175] __mutex_lock+0x3e2/0x10e0 [ 657.386767][ T1175] ? addrconf_verify_work+0xa/0x20 [ 657.393182][ T1175] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.398572][ T1175] ? lock_release+0x8f0/0x8f0 [ 657.404643][ T1175] ? lock_downgrade+0x830/0x830 [ 657.409515][ T1175] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.417154][ T1175] ? lock_is_held_type+0xbb/0xf0 [ 657.422876][ T1175] addrconf_verify_work+0xa/0x20 [ 657.427964][ T1175] process_one_work+0x94c/0x1670 [ 657.434298][ T1175] ? lock_release+0x8f0/0x8f0 [ 657.438994][ T1175] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.445665][ T1175] ? rwlock_bug.part.0+0x90/0x90 [ 657.451494][ T1175] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.456712][ T1175] worker_thread+0x64c/0x1120 [ 657.463025][ T1175] ? __kthread_parkme+0x13f/0x1e0 [ 657.468062][ T1175] ? process_one_work+0x1670/0x1670 [ 657.475746][ T1175] kthread+0x3b5/0x4a0 [ 657.479826][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 657.486390][ T1175] ret_from_fork+0x1f/0x30 [ 657.491791][ T1175] [ 657.491791][ T1175] Showing all locks held in the system: [ 657.499524][ T1175] 1 lock held by khungtaskd/1175: [ 657.506002][ T1175] #0: ffffffff8a067f40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.517341][ T1175] 1 lock held by in:imklog/6777: [ 657.523146][ T1175] #0: ffff88809a19ebb0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.534342][ T1175] 3 locks held by kworker/0:3/6784: [ 657.539542][ T1175] #0: ffff88809a6efd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.552075][ T1175] #1: ffffc9000548fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.563564][ T1175] #2: ffffffff8b14f108 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.573879][ T1175] 1 lock held by syz-executor678/6908: [ 657.579381][ T1175] [ 657.583072][ T1175] ============================================= [ 657.583072][ T1175] [ 657.592427][ T1175] NMI backtrace for cpu 0 [ 657.596770][ T1175] CPU: 0 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.605030][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.615092][ T1175] Call Trace: [ 657.618541][ T1175] dump_stack+0x198/0x1fd [ 657.622924][ T1175] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.628228][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.633882][ T1175] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.639953][ T1175] watchdog+0xd7d/0x1000 [ 657.644214][ T1175] ? reset_hung_task_detector+0x30/0x30 [ 657.649764][ T1175] kthread+0x3b5/0x4a0 [ 657.653854][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 657.658993][ T1175] ret_from_fork+0x1f/0x30 [ 657.663701][ T1175] Sending NMI from CPU 0 to CPUs 1: [ 657.670758][ C1] NMI backtrace for cpu 1 [ 657.670765][ C1] CPU: 1 PID: 6908 Comm: syz-executor678 Not tainted 5.9.0-rc8-syzkaller #0 [ 657.670772][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.670776][ C1] RIP: 0010:lock_release+0x4e/0x8f0 [ 657.670788][ C1] Code: 24 10 b3 8a b5 41 48 8d 6c 24 10 48 c7 44 24 18 00 51 b1 89 48 c1 ed 03 48 c7 44 24 20 c0 ff 5b 81 48 01 e8 c7 00 f1 f1 f1 f1 40 04 f1 f1 04 f2 c7 40 08 04 f3 f3 f3 65 48 8b 04 25 28 00 00 [ 657.670793][ C1] RSP: 0018:ffffc90005646bd0 EFLAGS: 00000282 [ 657.670802][ C1] RAX: fffff52000ac8d7c RBX: dffffc0000000000 RCX: ffffffff868addc2 [ 657.670808][ C1] RDX: ffff888093446440 RSI: ffffffff868adf9e RDI: ffff88809f14c468 [ 657.670813][ C1] RBP: 1ffff92000ac8d7c R08: 0000000000000000 R09: ffff88809f14c407 [ 657.670819][ C1] R10: fffffffffffff000 R11: 0000000000000000 R12: ffffc90005646f88 [ 657.670825][ C1] R13: ffff88809f14c468 R14: ffffffff868adf9e R15: ffff88809f14c400 [ 657.670831][ C1] FS: 000000000078d880(0000) GS:ffff8880ae500000(0000) knlGS:0000000000000000 [ 657.670836][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.670841][ C1] CR2: 00000000006ce080 CR3: 00000000a96e1000 CR4: 00000000001506e0 [ 657.670847][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.670852][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.670856][ C1] Call Trace: [ 657.670859][ C1] ? __mutex_lock+0x626/0x10e0 [ 657.670864][ C1] ? lock_downgrade+0x830/0x830 [ 657.670868][ C1] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.670872][ C1] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.670876][ C1] __mutex_unlock_slowpath+0x81/0x610 [ 657.670881][ C1] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 657.670885][ C1] ? wait_for_completion+0x260/0x260 [ 657.670890][ C1] tcf_idr_check_alloc+0x29e/0x3b0 [ 657.670894][ C1] tcf_police_init+0x347/0x13a0 [ 657.670898][ C1] ? tcf_police_cleanup+0x60/0x60 [ 657.670902][ C1] ? find_held_lock+0x2d/0x110 [ 657.670906][ C1] ? tc_lookup_action_n+0xcd/0xf0 [ 657.670910][ C1] tcf_action_init_1+0x1a3/0x990 [ 657.670914][ C1] ? tcf_action_dump_old+0x80/0x80 [ 657.670919][ C1] ? lock_acquire+0x1f3/0xaf0 [ 657.670923][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.670927][ C1] ? find_held_lock+0x2d/0x110 [ 657.670931][ C1] ? fs_reclaim_release+0x90/0xd0 [ 657.670935][ C1] ? mark_lock+0x82/0x1660 [ 657.670940][ C1] tcf_exts_validate+0x138/0x420 [ 657.670944][ C1] ? tcf_exts_destroy+0xc0/0xc0 [ 657.670948][ C1] ? kmem_cache_alloc_trace+0x18e/0x300 [ 657.670952][ C1] ? __nla_parse+0x3d/0x4a [ 657.670956][ C1] rsvp_change+0x291/0x2990 [ 657.670960][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.670964][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.670969][ C1] ? find_held_lock+0x2d/0x110 [ 657.670973][ C1] ? tc_new_tfilter+0x1be4/0x2130 [ 657.670978][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.670982][ C1] ? lock_downgrade+0x830/0x830 [ 657.670986][ C1] ? blackhole_dequeue+0x10/0x10 [ 657.670990][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.670994][ C1] tc_new_tfilter+0x1398/0x2130 [ 657.670999][ C1] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.671003][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.671008][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.671013][ C1] ? is_bpf_text_address+0xcb/0x160 [ 657.671017][ C1] ? kernel_text_address+0xbd/0xf0 [ 657.671027][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.671032][ C1] ? security_capable+0x8f/0xc0 [ 657.671036][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.671040][ C1] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.671045][ C1] rtnetlink_rcv_msg+0x80f/0xad0 [ 657.671049][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.671053][ C1] ? lock_acquire+0x1f3/0xaf0 [ 657.671058][ C1] ? netlink_deliver_tap+0x146/0xb70 [ 657.671062][ C1] netlink_rcv_skb+0x15a/0x430 [ 657.671067][ C1] ? rtnetlink_put_metrics+0x510/0x510 [ 657.671071][ C1] ? netlink_ack+0xa10/0xa10 [ 657.671075][ C1] netlink_unicast+0x533/0x7d0 [ 657.671079][ C1] ? netlink_attachskb+0x810/0x810 [ 657.671084][ C1] ? __phys_addr_symbol+0x2c/0x70 [ 657.671088][ C1] ? __check_object_size+0x171/0x3e4 [ 657.671092][ C1] netlink_sendmsg+0x856/0xd90 [ 657.671097][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.671101][ C1] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 657.671105][ C1] ? netlink_unicast+0x7d0/0x7d0 [ 657.671109][ C1] sock_sendmsg+0xcf/0x120 [ 657.671114][ C1] ____sys_sendmsg+0x331/0x810 [ 657.671118][ C1] ? kernel_sendmsg+0x50/0x50 [ 657.671122][ C1] ? do_recvmmsg+0x6d0/0x6d0 [ 657.671126][ C1] ? sock_alloc_file+0x4f/0x190 [ 657.671131][ C1] ? __lock_acquire+0x164a/0x5780 [ 657.671135][ C1] ___sys_sendmsg+0xf3/0x170 [ 657.671139][ C1] ? sendmsg_copy_msghdr+0x160/0x160 [ 657.671144][ C1] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.671148][ C1] ? fs_reclaim_release+0x90/0xd0 [ 657.671152][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.671156][ C1] ? find_held_lock+0x2d/0x110 [ 657.671159][ C1] ? __might_fault+0x11f/0x1d0 [ 657.671163][ C1] ? lock_downgrade+0x830/0x830 [ 657.671167][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.671171][ C1] __sys_sendmmsg+0x195/0x480 [ 657.671174][ C1] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 657.671177][ C1] ? find_held_lock+0x2d/0x110 [ 657.671179][ C1] ? __fd_install+0x1b4/0x600 [ 657.671182][ C1] ? alloc_file_pseudo+0x1/0x250 [ 657.671184][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.671186][ C1] ? __fd_install+0x1e6/0x600 [ 657.671189][ C1] ? __sys_socket+0x16d/0x200 [ 657.671191][ C1] ? lock_is_held_type+0xbb/0xf0 [ 657.671194][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.671197][ C1] __x64_sys_sendmmsg+0x99/0x100 [ 657.671199][ C1] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.671202][ C1] do_syscall_64+0x2d/0x70 [ 657.671205][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.671207][ C1] RIP: 0033:0x441599 [ 657.671215][ 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 [ 657.671217][ C1] RSP: 002b:00007fffafbc2588 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 657.671224][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441599 [ 657.671227][ C1] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 657.671231][ C1] RBP: 00007fffafbc2590 R08: 0000000120080522 R09: 0000000120080522 [ 657.671234][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a3bb0 [ 657.671238][ C1] R13: 0000000000402470 R14: 0000000000000000 R15: 0000000000000000 [ 657.671242][ C1] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 657.690375][ T1175] Kernel panic - not syncing: hung_task: blocked tasks [ 658.324671][ T1175] CPU: 0 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 658.332909][ T1175] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.342969][ T1175] Call Trace: [ 658.346271][ T1175] dump_stack+0x198/0x1fd [ 658.350714][ T1175] panic+0x382/0x7fb [ 658.354621][ T1175] ? __warn_printk+0xf3/0xf3 [ 658.359230][ T1175] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.365058][ T1175] ? preempt_schedule_thunk+0x16/0x18 [ 658.370437][ T1175] ? watchdog.cold+0x5/0x16b [ 658.375032][ T1175] ? watchdog+0xa82/0x1000 [ 658.379484][ T1175] watchdog.cold+0x16/0x16b [ 658.384000][ T1175] ? reset_hung_task_detector+0x30/0x30 [ 658.389561][ T1175] kthread+0x3b5/0x4a0 [ 658.393636][ T1175] ? __kthread_bind_mask+0xc0/0xc0 [ 658.398753][ T1175] ret_from_fork+0x1f/0x30 [ 658.404570][ T1175] Kernel Offset: disabled [ 658.408897][ T1175] Rebooting in 86400 seconds..