Warning: Permanently added '10.128.10.62' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 494.049560][ T6849] IPVS: ftp: loaded support on port[0] = 21 [ 657.452731][ T1174] INFO: task kworker/0:1:12 blocked for more than 143 seconds. [ 657.460496][ T1174] Not tainted 5.9.0-rc8-syzkaller #0 [ 657.471017][ T1174] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.481712][ T1174] task:kworker/0:1 state:D stack:28680 pid: 12 ppid: 2 flags:0x00004000 [ 657.491949][ T1174] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.499178][ T1174] Call Trace: [ 657.502514][ T1174] __schedule+0xec9/0x2280 [ 657.508170][ T1174] ? io_schedule_timeout+0x140/0x140 [ 657.514323][ T1174] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.520311][ T1174] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.526866][ T1174] ? lockdep_hardirqs_on+0x53/0x100 [ 657.532074][ T1174] schedule+0xd0/0x2a0 [ 657.537410][ T1174] schedule_preempt_disabled+0xf/0x20 [ 657.543615][ T1174] __mutex_lock+0x3e2/0x10e0 [ 657.548217][ T1174] ? addrconf_verify_work+0xa/0x20 [ 657.555488][ T1174] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.560873][ T1174] ? lock_release+0x8f0/0x8f0 [ 657.566736][ T1174] ? lock_downgrade+0x830/0x830 [ 657.571603][ T1174] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.578092][ T1174] ? lock_is_held_type+0xbb/0xf0 [ 657.583835][ T1174] addrconf_verify_work+0xa/0x20 [ 657.588783][ T1174] process_one_work+0x94c/0x1670 [ 657.594970][ T1174] ? lock_release+0x8f0/0x8f0 [ 657.599659][ T1174] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.607374][ T1174] ? rwlock_bug.part.0+0x90/0x90 [ 657.612329][ T1174] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.618770][ T1174] worker_thread+0x64c/0x1120 [ 657.624242][ T1174] ? process_one_work+0x1670/0x1670 [ 657.629449][ T1174] kthread+0x3b5/0x4a0 [ 657.634820][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 657.639942][ T1174] ret_from_fork+0x1f/0x30 [ 657.645804][ T1174] [ 657.645804][ T1174] Showing all locks held in the system: [ 657.654427][ T1174] 3 locks held by kworker/0:1/12: [ 657.659446][ T1174] #0: ffff888214c80d38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.671710][ T1174] #1: ffffc90000d2fda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.682850][ T1174] #2: ffffffff8b17a448 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.692266][ T1174] 1 lock held by khungtaskd/1174: [ 657.699320][ T1174] #0: ffffffff8a068480 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.709971][ T1174] 1 lock held by in:imklog/6561: [ 657.715681][ T1174] #0: ffff888094c5e430 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.725997][ T1174] 1 lock held by syz-executor083/6870: [ 657.731478][ T1174] [ 657.736144][ T1174] ============================================= [ 657.736144][ T1174] [ 657.745392][ T1174] NMI backtrace for cpu 1 [ 657.749732][ T1174] CPU: 1 PID: 1174 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 657.757957][ T1174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.768004][ T1174] Call Trace: [ 657.771394][ T1174] dump_stack+0x198/0x1fd [ 657.775731][ T1174] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.780943][ T1174] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.786575][ T1174] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.792552][ T1174] watchdog+0xd7d/0x1000 [ 657.796798][ T1174] ? reset_hung_task_detector+0x30/0x30 [ 657.802346][ T1174] kthread+0x3b5/0x4a0 [ 657.806412][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 657.811521][ T1174] ret_from_fork+0x1f/0x30 [ 657.816178][ T1174] Sending NMI from CPU 1 to CPUs 0: [ 657.822801][ C0] NMI backtrace for cpu 0 [ 657.822808][ C0] CPU: 0 PID: 6870 Comm: syz-executor083 Not tainted 5.9.0-rc8-syzkaller #0 [ 657.822815][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.822820][ C0] RIP: 0010:__sanitizer_cov_trace_cmp8+0x0/0x20 [ 657.822831][ C0] Code: 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 89 f2 89 fe bf 04 00 00 00 e9 2e ff ff ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 <48> 8b 0c 24 48 89 f2 48 89 fe bf 06 00 00 00 e9 0c ff ff ff 66 90 [ 657.822836][ C0] RSP: 0018:ffffc90000e36cd8 EFLAGS: 00000216 [ 657.822845][ C0] RAX: ffff8880a9ca90c0 RBX: dffffc0000000000 RCX: 000000000000001e [ 657.822850][ C0] RDX: ffff88808da10140 RSI: 0000000fffffffff RDI: 00000000ffffff55 [ 657.822856][ C0] RBP: 00000000ffffff55 R08: 0000000000000000 R09: ffff8880a817f007 [ 657.822862][ C0] R10: 0000000000000002 R11: 0000000000000000 R12: 0000000fffffffff [ 657.822867][ C0] R13: 0000000000000001 R14: ffff8880a817f000 R15: 0000000000000002 [ 657.822873][ C0] FS: 00000000012b6940(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 [ 657.822884][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.822890][ C0] CR2: 0000000020000280 CR3: 00000000a2a76000 CR4: 00000000001506f0 [ 657.822896][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.822901][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.822904][ C0] Call Trace: [ 657.822909][ C0] __radix_tree_lookup+0xd4/0x290 [ 657.822913][ C0] tcf_idr_check_alloc+0xb0/0x3b0 [ 657.822917][ C0] tcf_police_init+0x347/0x13a0 [ 657.822921][ C0] ? tcf_police_cleanup+0x60/0x60 [ 657.822925][ C0] ? find_held_lock+0x2d/0x110 [ 657.822929][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 657.822933][ C0] tcf_action_init_1+0x1a3/0x990 [ 657.822937][ C0] ? tcf_action_dump_old+0x80/0x80 [ 657.822941][ C0] ? lock_acquire+0x1f3/0xaf0 [ 657.822945][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.822949][ C0] ? find_held_lock+0x2d/0x110 [ 657.822953][ C0] ? fs_reclaim_release+0x90/0xd0 [ 657.822957][ C0] ? mark_lock+0x82/0x1660 [ 657.822961][ C0] tcf_exts_validate+0x138/0x420 [ 657.822965][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 657.822969][ C0] ? kmem_cache_alloc_trace+0x18e/0x300 [ 657.822973][ C0] ? __nla_parse+0x3d/0x4a [ 657.822977][ C0] rsvp_change+0x291/0x27a0 [ 657.822981][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.822985][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.822989][ C0] ? find_held_lock+0x2d/0x110 [ 657.822993][ C0] ? tc_new_tfilter+0x1be4/0x2130 [ 657.822997][ C0] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.823001][ C0] ? lock_downgrade+0x830/0x830 [ 657.823005][ C0] ? blackhole_dequeue+0x10/0x10 [ 657.823009][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.823013][ C0] tc_new_tfilter+0x1398/0x2130 [ 657.823018][ C0] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.823022][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.823026][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.823031][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.823035][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.823039][ C0] ? security_capable+0x8f/0xc0 [ 657.823043][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.823047][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.823051][ C0] rtnetlink_rcv_msg+0x80f/0xad0 [ 657.823055][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 657.823059][ C0] ? lock_acquire+0x1f3/0xaf0 [ 657.823063][ C0] ? netlink_deliver_tap+0x146/0xb70 [ 657.823067][ C0] netlink_rcv_skb+0x15a/0x430 [ 657.823072][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 657.823075][ C0] ? netlink_ack+0xa10/0xa10 [ 657.823080][ C0] ? __kmalloc_node_track_caller+0x38/0x60 [ 657.823084][ C0] netlink_unicast+0x533/0x7d0 [ 657.823088][ C0] ? netlink_attachskb+0x810/0x810 [ 657.823092][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 657.823096][ C0] ? __check_object_size+0x171/0x3e4 [ 657.823100][ C0] netlink_sendmsg+0x856/0xd90 [ 657.823104][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 657.823108][ C0] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 657.823112][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 657.823116][ C0] sock_sendmsg+0xcf/0x120 [ 657.823120][ C0] ____sys_sendmsg+0x331/0x810 [ 657.823124][ C0] ? kernel_sendmsg+0x50/0x50 [ 657.823128][ C0] ? do_recvmmsg+0x6d0/0x6d0 [ 657.823132][ C0] ? sock_alloc_file+0x4f/0x190 [ 657.823136][ C0] ? __lock_acquire+0x164a/0x5780 [ 657.823140][ C0] ___sys_sendmsg+0xf3/0x170 [ 657.823144][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 657.823149][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.823153][ C0] ? fs_reclaim_release+0x90/0xd0 [ 657.823157][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.823161][ C0] ? find_held_lock+0x2d/0x110 [ 657.823165][ C0] ? __might_fault+0x11f/0x1d0 [ 657.823169][ C0] ? lock_downgrade+0x830/0x830 [ 657.823173][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.823177][ C0] __sys_sendmmsg+0x195/0x480 [ 657.823181][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 657.823185][ C0] ? find_held_lock+0x2d/0x110 [ 657.823189][ C0] ? __fd_install+0x1b4/0x600 [ 657.823193][ C0] ? alloc_file_pseudo+0x1/0x250 [ 657.823197][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.823200][ C0] ? __fd_install+0x1e6/0x600 [ 657.823204][ C0] ? __sys_socket+0x16d/0x200 [ 657.823208][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.823213][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.823217][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 657.823222][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.823225][ C0] do_syscall_64+0x2d/0x70 [ 657.823230][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.823233][ C0] RIP: 0033:0x442809 [ 657.823245][ C0] Code: e8 cc ab 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 [ 657.823249][ C0] RSP: 002b:00007ffc0bb2e6e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 657.823259][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442809 [ 657.823264][ C0] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 657.823270][ C0] RBP: 00007ffc0bb2e700 R08: 0000000000000000 R09: 0000000000000000 [ 657.823275][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc0bb2e710 [ 657.823281][ C0] R13: 00000000004a3990 R14: 0000000000000000 R15: 0000000000000000 [ 657.823287][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 657.842647][ T1174] Kernel panic - not syncing: hung_task: blocked tasks [ 658.446358][ T1174] CPU: 1 PID: 1174 Comm: khungtaskd Not tainted 5.9.0-rc8-syzkaller #0 [ 658.454582][ T1174] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.464628][ T1174] Call Trace: [ 658.467922][ T1174] dump_stack+0x198/0x1fd [ 658.472255][ T1174] panic+0x382/0x7fb [ 658.476152][ T1174] ? __warn_printk+0xf3/0xf3 [ 658.480752][ T1174] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.486398][ T1174] ? preempt_schedule_thunk+0x16/0x18 [ 658.491783][ T1174] ? watchdog.cold+0x5/0x16b [ 658.496417][ T1174] ? watchdog+0xa82/0x1000 [ 658.500832][ T1174] watchdog.cold+0x16/0x16b [ 658.505339][ T1174] ? reset_hung_task_detector+0x30/0x30 [ 658.510885][ T1174] kthread+0x3b5/0x4a0 [ 658.514951][ T1174] ? __kthread_bind_mask+0xc0/0xc0 [ 658.520061][ T1174] ret_from_fork+0x1f/0x30 [ 658.525751][ T1174] Kernel Offset: disabled [ 658.530101][ T1174] Rebooting in 86400 seconds..