Warning: Permanently added '10.128.10.40' (ECDSA) to the list of known hosts. syzkaller login: [ 481.938565][ T6869] IPVS: ftp: loaded support on port[0] = 21 [ 636.783434][ T1154] INFO: task syz-executor521:6891 can't die for more than 143 seconds. [ 636.791826][ T1154] task:syz-executor521 state:R running task stack:25120 pid: 6891 ppid: 6869 flags:0x00004006 [ 636.805218][ T1154] Call Trace: [ 636.808551][ T1154] ? mark_lock+0xf7/0x2420 [ 636.812985][ T1154] ? lock_acquire+0x1f2/0xaa0 [ 636.820626][ T1154] ? tcf_idr_check_alloc+0x78/0x3b0 [ 636.826693][ T1154] ? lock_release+0x890/0x890 [ 636.831381][ T1154] ? lock_chain_count+0x20/0x20 [ 636.837638][ T1154] ? lock_is_held_type+0xbb/0xf0 [ 636.842677][ T1154] ? __mutex_lock+0x134/0x10e0 [ 636.848858][ T1154] ? tcf_idr_check_alloc+0x78/0x3b0 [ 636.854954][ T1154] ? tcf_idr_check_alloc+0x78/0x3b0 [ 636.860171][ T1154] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 636.867616][ T1154] ? mutex_lock_io_nested+0xf60/0xf60 [ 636.873013][ T1154] ? __mutex_unlock_slowpath+0xe2/0x610 [ 636.879960][ T1154] ? __radix_tree_lookup+0x10e/0x290 [ 636.886110][ T1154] ? __sanitizer_cov_trace_pc+0x10/0x60 [ 636.891675][ T1154] ? wait_for_completion+0x260/0x260 [ 636.898335][ T1154] ? tcf_idr_check_alloc+0x29e/0x3b0 [ 636.904565][ T1154] ? tcf_police_init+0x347/0x13a0 [ 636.909613][ T1154] ? tcf_police_cleanup+0x60/0x60 [ 636.916035][ T1154] ? find_held_lock+0x2d/0x110 [ 636.920847][ T1154] ? tcf_action_init_1+0x1a3/0x990 [ 636.928621][ T1154] ? tcf_action_dump_old+0x80/0x80 [ 636.934614][ T1154] ? __kernel_text_address+0x9/0x30 [ 636.939838][ T1154] ? lock_chain_count+0x20/0x20 [ 636.947340][ T1154] ? lock_acquire+0x1f2/0xaa0 [ 636.952032][ T1154] ? lock_is_held_type+0xbb/0xf0 [ 636.958292][ T1154] ? find_held_lock+0x2d/0x110 [ 636.963130][ T1154] ? fs_reclaim_release+0x90/0xd0 [ 636.969636][ T1154] ? tcf_exts_validate+0x138/0x420 [ 636.975733][ T1154] ? tcf_exts_destroy+0xc0/0xc0 [ 636.980600][ T1154] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 636.987593][ T1154] ? trace_kmalloc+0xbe/0xf0 [ 636.992197][ T1154] ? kmem_cache_alloc_trace+0x1b9/0x480 [ 636.999300][ T1154] ? rsvp_change+0x291/0x27a0 [ 637.004925][ T1154] ? lock_is_held_type+0xbb/0xf0 [ 637.009881][ T1154] ? lock_is_held_type+0xbb/0xf0 [ 637.016105][ T1154] ? find_held_lock+0x2d/0x110 [ 637.020905][ T1154] ? tc_new_tfilter+0x1be4/0x2130 [ 637.027266][ T1154] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 637.032825][ T1154] ? lock_downgrade+0x830/0x830 [ 637.038970][ T1154] ? blackhole_dequeue+0x10/0x10 [ 637.044749][ T1154] ? lock_is_held_type+0xbb/0xf0 [ 637.049708][ T1154] ? tc_new_tfilter+0x1398/0x2130 [ 637.056317][ T1154] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 637.061888][ T1154] ? tc_del_tfilter+0x15c0/0x15c0 [ 637.068250][ T1154] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 637.076293][ T1154] ? lock_is_held_type+0xbb/0xf0 [ 637.081357][ T1154] ? security_capable+0x8f/0xc0 [ 637.087572][ T1154] ? lock_is_held_type+0xbb/0xf0 [ 637.092527][ T1154] ? tc_del_tfilter+0x15c0/0x15c0 [ 637.098910][ T1154] ? rtnetlink_rcv_msg+0x80f/0xad0 [ 637.104862][ T1154] ? rtnetlink_put_metrics+0x510/0x510 [ 637.110340][ T1154] ? lock_acquire+0x1f2/0xaa0 [ 637.116351][ T1154] ? netlink_deliver_tap+0x146/0xb70 [ 637.121655][ T1154] ? netlink_rcv_skb+0x15a/0x430 [ 637.127856][ T1154] ? rtnetlink_put_metrics+0x510/0x510 [ 637.134175][ T1154] ? netlink_ack+0xa10/0xa10 [ 637.138794][ T1154] ? netlink_unicast+0x533/0x7d0 [ 637.146241][ T1154] ? netlink_attachskb+0x810/0x810 [ 637.151386][ T1154] ? __phys_addr_symbol+0x2c/0x70 [ 637.158028][ T1154] ? __check_object_size+0x171/0x3f0 [ 637.164150][ T1154] ? netlink_sendmsg+0x856/0xd90 [ 637.169108][ T1154] ? netlink_unicast+0x7d0/0x7d0 [ 637.175407][ T1154] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 637.180708][ T1154] ? netlink_unicast+0x7d0/0x7d0 [ 637.186956][ T1154] ? sock_sendmsg+0xcf/0x120 [ 637.191561][ T1154] ? ____sys_sendmsg+0x331/0x810 [ 637.197807][ T1154] ? kernel_sendmsg+0x50/0x50 [ 637.202495][ T1154] ? do_recvmmsg+0x700/0x700 [ 637.209571][ T1154] ? __lock_acquire+0x1677/0x56d0 [ 637.215456][ T1154] ? ___sys_sendmsg+0xf3/0x170 [ 637.220235][ T1154] ? sendmsg_copy_msghdr+0x160/0x160 [ 637.226769][ T1154] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 637.232793][ T1154] ? lock_is_held_type+0xbb/0xf0 [ 637.239064][ T1154] ? find_held_lock+0x2d/0x110 [ 637.244699][ T1154] ? __might_fault+0xd3/0x180 [ 637.249393][ T1154] ? lock_downgrade+0x830/0x830 [ 637.255536][ T1154] ? get_max_files+0x10/0x10 [ 637.260143][ T1154] ? kasan_save_stack+0x1b/0x40 [ 637.266455][ T1154] ? lock_is_held_type+0xbb/0xf0 [ 637.271417][ T1154] ? __sys_sendmmsg+0x196/0x4b0 [ 637.277642][ T1154] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 637.282693][ T1154] ? lockdep_hardirqs_on+0x53/0x100 [ 637.289233][ T1154] ? debug_object_active_state+0x1/0x350 [ 637.295742][ T1154] ? check_preemption_disabled+0x50/0x130 [ 637.301544][ T1154] ? blkcg_maybe_throttle_current+0x640/0xd70 [ 637.308889][ T1154] ? call_rcu+0x386/0x7d0 [ 637.314136][ T1154] ? lock_is_held_type+0xbb/0xf0 [ 637.319134][ T1154] ? mem_cgroup_move_account+0xbc0/0xbc0 [ 637.326384][ T1154] ? lock_is_held_type+0xbb/0xf0 [ 637.331342][ T1154] ? __x64_sys_sendmmsg+0x99/0x100 [ 637.338950][ T1154] ? syscall_enter_from_user_mode+0x1d/0x60 [ 637.345649][ T1154] ? do_syscall_64+0x2d/0x70 [ 637.350260][ T1154] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 637.358713][ T1154] [ 637.358713][ T1154] Showing all locks held in the system: [ 637.367451][ T1154] 1 lock held by khungtaskd/1154: [ 637.372495][ T1154] #0: ffffffff8a554de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 637.385692][ T1154] 1 lock held by in:imklog/6713: [ 637.390631][ T1154] #0: ffff888027bbd0f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 637.401166][ T1154] 3 locks held by kworker/0:0/6861: [ 637.407358][ T1154] #0: ffff888137287138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 [ 637.419387][ T1154] #1: ffffc90001a17da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 [ 637.430722][ T1154] #2: ffffffff8b6cecc8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 637.441122][ T1154] 1 lock held by syz-executor521/6891: [ 637.447446][ T1154] [ 637.449805][ T1154] ============================================= [ 637.449805][ T1154] [ 637.459511][ T1154] Kernel panic - not syncing: hung_task: blocked tasks [ 637.466431][ T1154] CPU: 0 PID: 1154 Comm: khungtaskd Not tainted 5.9.0-rc8-next-20201007-syzkaller #0 [ 637.475881][ T1154] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 637.485933][ T1154] Call Trace: [ 637.489266][ T1154] dump_stack+0x198/0x1fb [ 637.493608][ T1154] panic+0x382/0x7fb [ 637.497525][ T1154] ? __warn_printk+0xf3/0xf3 [ 637.502133][ T1154] ? watchdog.cold+0x22d/0x248 [ 637.506901][ T1154] ? watchdog+0xc59/0xf30 [ 637.511233][ T1154] watchdog.cold+0x23e/0x248 [ 637.515828][ T1154] ? trace_sched_process_hang+0x280/0x280 [ 637.521546][ T1154] kthread+0x3af/0x4a0 [ 637.525617][ T1154] ? __kthread_bind_mask+0xc0/0xc0 [ 637.530746][ T1154] ret_from_fork+0x1f/0x30 [ 637.536452][ T1154] Kernel Offset: disabled [ 637.540775][ T1154] Rebooting in 86400 seconds..