Warning: Permanently added '10.128.0.67' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 624.661546][ T8490] IPVS: ftp: loaded support on port[0] = 21 [ 780.535102][ T1645] INFO: task kworker/0:2:2998 blocked for more than 143 seconds. [ 780.543097][ T1645] Not tainted 5.10.0-rc1-syzkaller #0 [ 780.551524][ T1645] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 780.561031][ T1645] task:kworker/0:2 state:D stack:26760 pid: 2998 ppid: 2 flags:0x00004000 [ 780.572259][ T1645] Workqueue: ipv6_addrconf addrconf_verify_work [ 780.579374][ T1645] Call Trace: [ 780.582722][ T1645] __schedule+0x893/0x2130 [ 780.588408][ T1645] ? io_schedule_timeout+0x140/0x140 [ 780.593711][ T1645] ? _raw_spin_unlock_irq+0x1f/0x40 [ 780.600085][ T1645] ? lockdep_hardirqs_on+0x85/0x110 [ 780.605948][ T1645] schedule+0xcf/0x270 [ 780.610037][ T1645] schedule_preempt_disabled+0xf/0x20 [ 780.616633][ T1645] __mutex_lock+0x3e2/0x10e0 [ 780.621242][ T1645] ? addrconf_verify_work+0xa/0x20 [ 780.627812][ T1645] ? mutex_lock_io_nested+0xf60/0xf60 [ 780.633261][ T1645] ? lock_release+0x710/0x710 [ 780.639146][ T1645] ? lock_downgrade+0x6d0/0x6d0 [ 780.644035][ T1645] addrconf_verify_work+0xa/0x20 [ 780.650056][ T1645] process_one_work+0x933/0x15a0 [ 780.655758][ T1645] ? lock_release+0x710/0x710 [ 780.660449][ T1645] ? pwq_dec_nr_in_flight+0x320/0x320 [ 780.666913][ T1645] ? rwlock_bug.part.0+0x90/0x90 [ 780.671865][ T1645] ? _raw_spin_lock_irq+0x41/0x50 [ 780.678014][ T1645] worker_thread+0x64c/0x1120 [ 780.682723][ T1645] ? __kthread_parkme+0x13f/0x1e0 [ 780.688817][ T1645] ? process_one_work+0x15a0/0x15a0 [ 780.694039][ T1645] kthread+0x3af/0x4a0 [ 780.700429][ T1645] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 780.707022][ T1645] ret_from_fork+0x1f/0x30 [ 780.711609][ T1645] [ 780.711609][ T1645] Showing all locks held in the system: [ 780.720441][ T1645] 1 lock held by khungtaskd/1645: [ 780.727317][ T1645] #0: ffffffff8b337160 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 780.737893][ T1645] 3 locks held by kworker/0:2/2998: [ 780.743095][ T1645] #0: ffff8881479ebd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 [ 780.755233][ T1645] #1: ffffc90001507da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 [ 780.766188][ T1645] #2: ffffffff8c926d08 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 780.776402][ T1645] 1 lock held by in:imklog/8185: [ 780.781345][ T1645] #0: ffff88801ed96370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 780.791747][ T1645] 1 lock held by syz-executor081/8511: [ 780.798116][ T1645] [ 780.800442][ T1645] ============================================= [ 780.800442][ T1645] [ 780.810200][ T1645] NMI backtrace for cpu 1 [ 780.814546][ T1645] CPU: 1 PID: 1645 Comm: khungtaskd Not tainted 5.10.0-rc1-syzkaller #0 [ 780.822865][ T1645] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.832913][ T1645] Call Trace: [ 780.836234][ T1645] dump_stack+0x107/0x163 [ 780.840569][ T1645] nmi_cpu_backtrace.cold+0x44/0xd7 [ 780.845837][ T1645] ? lapic_can_unplug_cpu+0x80/0x80 [ 780.851094][ T1645] nmi_trigger_cpumask_backtrace+0x1b3/0x230 [ 780.857108][ T1645] watchdog+0xd43/0xfa0 [ 780.861268][ T1645] ? reset_hung_task_detector+0x30/0x30 [ 780.866819][ T1645] kthread+0x3af/0x4a0 [ 780.870893][ T1645] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 780.876789][ T1645] ret_from_fork+0x1f/0x30 [ 780.881439][ T1645] Sending NMI from CPU 1 to CPUs 0: [ 780.887984][ C0] NMI backtrace for cpu 0 [ 780.887991][ C0] CPU: 0 PID: 8511 Comm: syz-executor081 Not tainted 5.10.0-rc1-syzkaller #0 [ 780.887998][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 780.888003][ C0] RIP: 0010:__sanitizer_cov_trace_pc+0x19/0x60 [ 780.888015][ C0] Code: 8b 54 24 08 48 8b 34 24 e9 a1 fd ff ff 0f 1f 40 00 65 48 8b 14 25 00 f0 01 00 65 8b 05 b0 e8 91 7e a9 00 01 ff 00 48 8b 34 24 <74> 0f f6 c4 01 74 35 8b 82 54 14 00 00 85 c0 74 2b 8b 82 30 14 00 [ 780.888020][ C0] RSP: 0018:ffffc9000131ed48 EFLAGS: 00000246 [ 780.888030][ C0] RAX: 0000000080000000 RBX: fffffffffffffff0 RCX: ffffffff87107032 [ 780.888035][ C0] RDX: ffff888020df3480 RSI: ffffffff87107206 RDI: 0000000000000007 [ 780.888041][ C0] RBP: ffffc9000131ee00 R08: 0000000000000000 R09: ffff888011f92a07 [ 780.888046][ C0] R10: fffffffffffff000 R11: 0000000000000000 R12: ffffc9000131ef88 [ 780.888052][ C0] R13: 0000000000000001 R14: ffff888011f92a00 R15: ffff888011f92a90 [ 780.888058][ C0] FS: 000000000183d880(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 [ 780.888063][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 780.888068][ C0] CR2: 00000000006cd080 CR3: 0000000016529000 CR4: 00000000001506f0 [ 780.888074][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 780.888079][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 780.888082][ C0] Call Trace: [ 780.888086][ C0] tcf_idr_check_alloc+0x296/0x3b0 [ 780.888090][ C0] tcf_police_init+0x347/0x13a0 [ 780.888094][ C0] ? tcf_police_cleanup+0x60/0x60 [ 780.888098][ C0] ? find_held_lock+0x2d/0x110 [ 780.888101][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 780.888106][ C0] ? stack_trace_consume_entry+0x160/0x160 [ 780.888110][ C0] tcf_action_init_1+0x1a3/0x990 [ 780.888113][ C0] ? tcf_action_dump_old+0x80/0x80 [ 780.888117][ C0] ? ___sys_sendmsg+0xf3/0x170 [ 780.888121][ C0] ? __sys_sendmmsg+0x195/0x470 [ 780.888125][ C0] ? __x64_sys_sendmmsg+0x99/0x100 [ 780.888128][ C0] ? do_syscall_64+0x2d/0x70 [ 780.888133][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.888136][ C0] ? find_held_lock+0x2d/0x110 [ 780.888140][ C0] tcf_exts_validate+0x138/0x420 [ 780.888144][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 780.888148][ C0] ? kasan_unpoison_shadow+0x33/0x40 [ 780.888151][ C0] rsvp_change+0x291/0x27a0 [ 780.888155][ C0] ? find_held_lock+0x2d/0x110 [ 780.888159][ C0] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 780.888163][ C0] ? lock_downgrade+0x6d0/0x6d0 [ 780.888167][ C0] ? blackhole_dequeue+0x10/0x10 [ 780.888170][ C0] tc_new_tfilter+0x1398/0x2130 [ 780.888180][ C0] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 780.888184][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.888188][ C0] ? lock_chain_count+0x20/0x20 [ 780.888192][ C0] ? kernel_text_address+0xbd/0xf0 [ 780.888195][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 780.888199][ C0] rtnetlink_rcv_msg+0x80e/0xad0 [ 780.888203][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 780.888207][ C0] netlink_rcv_skb+0x153/0x420 [ 780.888211][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 780.888215][ C0] ? netlink_ack+0xaa0/0xaa0 [ 780.888219][ C0] ? netlink_deliver_tap+0x227/0xb70 [ 780.888223][ C0] netlink_unicast+0x533/0x7d0 [ 780.888227][ C0] ? netlink_attachskb+0x810/0x810 [ 780.888231][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 780.888235][ C0] ? __check_object_size+0x171/0x3f0 [ 780.888239][ C0] netlink_sendmsg+0x856/0xd90 [ 780.888242][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 780.888247][ C0] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 780.888250][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 780.888254][ C0] sock_sendmsg+0xcf/0x120 [ 780.888258][ C0] ____sys_sendmsg+0x331/0x810 [ 780.888261][ C0] ? kernel_sendmsg+0x50/0x50 [ 780.888265][ C0] ? do_recvmmsg+0x6c0/0x6c0 [ 780.888269][ C0] ? __lock_acquire+0x16a0/0x5590 [ 780.888272][ C0] ___sys_sendmsg+0xf3/0x170 [ 780.888276][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 780.888280][ C0] ? find_held_lock+0x2d/0x110 [ 780.888284][ C0] ? __might_fault+0xd3/0x180 [ 780.888287][ C0] ? lock_downgrade+0x6d0/0x6d0 [ 780.888291][ C0] __sys_sendmmsg+0x195/0x470 [ 780.888295][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 780.888298][ C0] ? find_held_lock+0x2d/0x110 [ 780.888302][ C0] ? alloc_file_pseudo+0x1/0x250 [ 780.888306][ C0] ? __fd_install+0x1e6/0x600 [ 780.888309][ C0] ? __sys_socket+0x16d/0x200 [ 780.888313][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 780.888318][ C0] ? syscall_enter_from_user_mode+0x1d/0x50 [ 780.888321][ C0] do_syscall_64+0x2d/0x70 [ 780.888325][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 780.888329][ C0] RIP: 0033:0x441729 [ 780.888340][ C0] 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 [ 780.888344][ C0] RSP: 002b:00007ffc3a87f8e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 780.888354][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441729 [ 780.888360][ C0] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 780.888365][ C0] RBP: 00007ffc3a87f8f0 R08: 0000000120080522 R09: 0000000120080522 [ 780.888371][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2a70 [ 780.888376][ C0] R13: 0000000000402600 R14: 0000000000000000 R15: 0000000000000000 [ 780.888382][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.239 msecs [ 780.904933][ T1645] Kernel panic - not syncing: hung_task: blocked tasks [ 781.423285][ T1645] CPU: 1 PID: 1645 Comm: khungtaskd Not tainted 5.10.0-rc1-syzkaller #0 [ 781.431605][ T1645] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 781.441654][ T1645] Call Trace: [ 781.444955][ T1645] dump_stack+0x107/0x163 [ 781.449317][ T1645] panic+0x306/0x73d [ 781.453218][ T1645] ? __warn_printk+0xf3/0xf3 [ 781.457817][ T1645] ? lapic_can_unplug_cpu+0x80/0x80 [ 781.463012][ T1645] ? preempt_schedule_thunk+0x16/0x18 [ 781.468385][ T1645] ? watchdog.cold+0x5/0x158 [ 781.472975][ T1645] ? watchdog+0xa80/0xfa0 [ 781.477339][ T1645] watchdog.cold+0x16/0x158 [ 781.481849][ T1645] ? reset_hung_task_detector+0x30/0x30 [ 781.487397][ T1645] kthread+0x3af/0x4a0 [ 781.491466][ T1645] ? kthread_create_worker_on_cpu+0xf0/0xf0 [ 781.497361][ T1645] ret_from_fork+0x1f/0x30 [ 781.502792][ T1645] Kernel Offset: disabled [ 781.507147][ T1645] Rebooting in 86400 seconds..