Warning: Permanently added '10.128.0.192' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 493.522795][ T6879] IPVS: ftp: loaded support on port[0] = 21 [ 657.355839][ T1168] INFO: task kworker/0:3:3102 blocked for more than 143 seconds. [ 657.363762][ T1168] Not tainted 5.9.0-rc6-syzkaller #0 [ 657.374842][ T1168] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 657.384644][ T1168] task:kworker/0:3 state:D stack:28664 pid: 3102 ppid: 2 flags:0x00004000 [ 657.395206][ T1168] Workqueue: ipv6_addrconf addrconf_verify_work [ 657.402733][ T1168] Call Trace: [ 657.407053][ T1168] __schedule+0xec9/0x2280 [ 657.411499][ T1168] ? io_schedule_timeout+0x140/0x140 [ 657.418454][ T1168] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 657.424493][ T1168] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.431179][ T1168] ? lockdep_hardirqs_on+0x53/0x100 [ 657.437362][ T1168] schedule+0xd0/0x2a0 [ 657.441455][ T1168] schedule_preempt_disabled+0xf/0x20 [ 657.449228][ T1168] __mutex_lock+0x3e2/0x10e0 [ 657.453844][ T1168] ? addrconf_verify_work+0xa/0x20 [ 657.460666][ T1168] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.466951][ T1168] ? lock_release+0x8f0/0x8f0 [ 657.471645][ T1168] ? lock_downgrade+0x830/0x830 [ 657.477953][ T1168] ? _raw_spin_unlock_irq+0x1f/0x80 [ 657.483197][ T1168] ? lock_is_held_type+0xbb/0xf0 [ 657.489646][ T1168] addrconf_verify_work+0xa/0x20 [ 657.494699][ T1168] process_one_work+0x94c/0x1670 [ 657.502408][ T1168] ? lock_release+0x8f0/0x8f0 [ 657.508407][ T1168] ? pwq_dec_nr_in_flight+0x320/0x320 [ 657.513865][ T1168] ? rwlock_bug.part.0+0x90/0x90 [ 657.520398][ T1168] ? lockdep_hardirqs_off+0x96/0xd0 [ 657.527016][ T1168] worker_thread+0x64c/0x1120 [ 657.531802][ T1168] ? __kthread_parkme+0x13f/0x1e0 [ 657.538334][ T1168] ? process_one_work+0x1670/0x1670 [ 657.543578][ T1168] kthread+0x3b5/0x4a0 [ 657.549129][ T1168] ? __kthread_bind_mask+0xc0/0xc0 [ 657.554388][ T1168] ret_from_fork+0x1f/0x30 [ 657.560530][ T1168] [ 657.560530][ T1168] Showing all locks held in the system: [ 657.569284][ T1168] 1 lock held by khungtaskd/1168: [ 657.574312][ T1168] #0: ffffffff8a067f00 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 [ 657.586365][ T1168] 3 locks held by kworker/0:3/3102: [ 657.591608][ T1168] #0: ffff888214d86138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 [ 657.604123][ T1168] #1: ffffc900097bfda8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 [ 657.615288][ T1168] #2: ffffffff8b14d648 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 [ 657.627072][ T1168] 1 lock held by in:imklog/6723: [ 657.632109][ T1168] #0: ffff8880a85a7170 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 [ 657.642753][ T1168] 1 lock held by syz-executor999/6901: [ 657.649048][ T1168] [ 657.651384][ T1168] ============================================= [ 657.651384][ T1168] [ 657.664091][ T1168] NMI backtrace for cpu 1 [ 657.668537][ T1168] CPU: 1 PID: 1168 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 657.677135][ T1168] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.687210][ T1168] Call Trace: [ 657.690681][ T1168] dump_stack+0x198/0x1fd [ 657.695050][ T1168] nmi_cpu_backtrace.cold+0x70/0xb1 [ 657.700367][ T1168] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 657.706028][ T1168] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 657.712115][ T1168] watchdog+0xd7d/0x1000 [ 657.716376][ T1168] ? reset_hung_task_detector+0x30/0x30 [ 657.722544][ T1168] kthread+0x3b5/0x4a0 [ 657.726630][ T1168] ? __kthread_bind_mask+0xc0/0xc0 [ 657.731761][ T1168] ret_from_fork+0x1f/0x30 [ 657.736358][ T1168] Sending NMI from CPU 1 to CPUs 0: [ 657.743575][ C0] NMI backtrace for cpu 0 [ 657.743582][ C0] CPU: 0 PID: 6901 Comm: syz-executor999 Not tainted 5.9.0-rc6-syzkaller #0 [ 657.743589][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 657.743593][ C0] RIP: 0010:arch_local_irq_restore+0x2e/0x50 [ 657.743605][ C0] Code: 6b fc 89 53 48 89 fb 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 18 48 83 3d 21 7f a1 08 00 74 0c 48 89 df 57 9d <0f> 1f 44 00 00 5b c3 0f 0b 48 c7 c7 a8 6b fc 89 e8 3d 23 5c 00 eb [ 657.743609][ C0] RSP: 0018:ffffc90005436a88 EFLAGS: 00000286 [ 657.743618][ C0] RAX: 1ffffffff13f8d75 RBX: 0000000000000286 RCX: ffffffff815c091e [ 657.743623][ C0] RDX: dffffc0000000000 RSI: ffffffff8a067e40 RDI: 0000000000000286 [ 657.743629][ C0] RBP: ffff8880a92a20c0 R08: 0000000000000000 R09: ffffffff8b59664f [ 657.743634][ C0] R10: fffffbfff16b2cc9 R11: 0000000000000000 R12: 0000000000000000 [ 657.743640][ C0] R13: ffff8880a92a29a8 R14: ffff8880a92a29a8 R15: 0000000000000286 [ 657.743646][ C0] FS: 0000000000d40880(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000 [ 657.743650][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 657.743656][ C0] CR2: 0000000020000280 CR3: 00000000a22b1000 CR4: 00000000001506f0 [ 657.743661][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 657.743667][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 657.743670][ C0] Call Trace: [ 657.743675][ C0] lock_is_held_type+0xbb/0xf0 [ 657.743679][ C0] rcu_read_lock_sched_held+0x3a/0xb0 [ 657.743683][ C0] lock_acquire+0x843/0xaf0 [ 657.743687][ C0] ? lock_release+0x8f0/0x8f0 [ 657.743692][ C0] ? asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 657.743695][ C0] ? mark_lock+0x82/0x1660 [ 657.743700][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.743703][ C0] __mutex_lock+0x134/0x10e0 [ 657.743708][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.743712][ C0] ? tcf_idr_check_alloc+0x78/0x3b0 [ 657.743716][ C0] ? mutex_lock_io_nested+0xf60/0xf60 [ 657.743721][ C0] ? __mutex_unlock_slowpath+0xe2/0x610 [ 657.743725][ C0] ? wait_for_completion+0x260/0x260 [ 657.743729][ C0] tcf_idr_check_alloc+0x78/0x3b0 [ 657.743733][ C0] tcf_police_init+0x347/0x13a0 [ 657.743737][ C0] ? tcf_police_cleanup+0x60/0x60 [ 657.743741][ C0] ? find_held_lock+0x2d/0x110 [ 657.743746][ C0] ? tc_lookup_action_n+0xcd/0xf0 [ 657.743750][ C0] tcf_action_init_1+0x1a3/0x990 [ 657.743754][ C0] ? tcf_action_dump_old+0x80/0x80 [ 657.743758][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.743762][ C0] ? find_held_lock+0x2d/0x110 [ 657.743766][ C0] ? cache_alloc_refill+0x1e7/0x380 [ 657.743770][ C0] ? lock_downgrade+0x830/0x830 [ 657.743774][ C0] ? mark_lock+0x82/0x1660 [ 657.743778][ C0] tcf_exts_validate+0x138/0x420 [ 657.743782][ C0] ? tcf_exts_destroy+0xc0/0xc0 [ 657.743787][ C0] ? kmem_cache_alloc_trace+0x18e/0x300 [ 657.743791][ C0] ? __nla_parse+0x3d/0x4a [ 657.743795][ C0] rsvp_change+0x291/0x27a0 [ 657.743799][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.743803][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.743807][ C0] ? find_held_lock+0x2d/0x110 [ 657.743811][ C0] ? tc_new_tfilter+0x1be4/0x2130 [ 657.743815][ C0] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.743820][ C0] ? lock_downgrade+0x830/0x830 [ 657.743824][ C0] ? blackhole_dequeue+0x10/0x10 [ 657.743828][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.743832][ C0] tc_new_tfilter+0x1398/0x2130 [ 657.743836][ C0] ? tcf_bind_filter.isra.0+0x3c0/0x3c0 [ 657.743840][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.743845][ C0] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.743850][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.743854][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.743858][ C0] ? security_capable+0x8f/0xc0 [ 657.743862][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.743866][ C0] ? tc_del_tfilter+0x15c0/0x15c0 [ 657.743870][ C0] rtnetlink_rcv_msg+0x80f/0xad0 [ 657.743875][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 657.743879][ C0] ? lock_acquire+0x1f3/0xaf0 [ 657.743883][ C0] ? netlink_deliver_tap+0x146/0xb70 [ 657.743887][ C0] netlink_rcv_skb+0x15a/0x430 [ 657.743892][ C0] ? rtnetlink_put_metrics+0x510/0x510 [ 657.743895][ C0] ? netlink_ack+0xa10/0xa10 [ 657.743898][ C0] ? __kmalloc_node_track_caller+0x38/0x60 [ 657.743902][ C0] netlink_unicast+0x533/0x7d0 [ 657.743905][ C0] ? netlink_attachskb+0x810/0x810 [ 657.743908][ C0] ? __phys_addr_symbol+0x2c/0x70 [ 657.743911][ C0] ? __check_object_size+0x171/0x3e4 [ 657.743914][ C0] netlink_sendmsg+0x856/0xd90 [ 657.743918][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 657.743921][ C0] ? bpf_lsm_socket_sendmsg+0x5/0x10 [ 657.743924][ C0] ? netlink_unicast+0x7d0/0x7d0 [ 657.743927][ C0] sock_sendmsg+0xcf/0x120 [ 657.743931][ C0] ____sys_sendmsg+0x331/0x810 [ 657.743934][ C0] ? kernel_sendmsg+0x50/0x50 [ 657.743938][ C0] ? do_recvmmsg+0x6d0/0x6d0 [ 657.743941][ C0] ? sock_alloc_file+0x4f/0x190 [ 657.743945][ C0] ? __lock_acquire+0x164a/0x5780 [ 657.743948][ C0] ___sys_sendmsg+0xf3/0x170 [ 657.743951][ C0] ? sendmsg_copy_msghdr+0x160/0x160 [ 657.743955][ C0] ? lockdep_hardirqs_on_prepare+0x530/0x530 [ 657.743957][ C0] ? fs_reclaim_release+0x90/0xd0 [ 657.743959][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.743961][ C0] ? find_held_lock+0x2d/0x110 [ 657.743964][ C0] ? __might_fault+0x11f/0x1d0 [ 657.743966][ C0] ? lock_downgrade+0x830/0x830 [ 657.743968][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.743970][ C0] __sys_sendmmsg+0x195/0x480 [ 657.743972][ C0] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 657.743974][ C0] ? find_held_lock+0x2d/0x110 [ 657.743977][ C0] ? __fd_install+0x1b4/0x600 [ 657.743979][ C0] ? alloc_file_pseudo+0x1/0x250 [ 657.743981][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.743983][ C0] ? __fd_install+0x1e6/0x600 [ 657.743985][ C0] ? __sys_socket+0x16d/0x200 [ 657.743987][ C0] ? lock_is_held_type+0xbb/0xf0 [ 657.743990][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.743992][ C0] __x64_sys_sendmmsg+0x99/0x100 [ 657.743995][ C0] ? syscall_enter_from_user_mode+0x1d/0x60 [ 657.743997][ C0] do_syscall_64+0x2d/0x70 [ 657.743999][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 657.744001][ C0] RIP: 0033:0x441769 [ 657.744008][ 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 [ 657.744011][ C0] RSP: 002b:00007ffc65d1a158 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 657.744017][ C0] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441769 [ 657.744020][ C0] RDX: 04924924924926d3 RSI: 0000000020000200 RDI: 0000000000000004 [ 657.744023][ C0] RBP: 00007ffc65d1a160 R08: 0000000120080522 R09: 0000000120080522 [ 657.744027][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004a2ab0 [ 657.744030][ C0] R13: 0000000000402640 R14: 0000000000000000 R15: 0000000000000000 [ 657.744034][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 657.801901][ T1168] Kernel panic - not syncing: hung_task: blocked tasks [ 658.434702][ T1168] CPU: 1 PID: 1168 Comm: khungtaskd Not tainted 5.9.0-rc6-syzkaller #0 [ 658.443032][ T1168] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 658.453117][ T1168] Call Trace: [ 658.456453][ T1168] dump_stack+0x198/0x1fd [ 658.460909][ T1168] panic+0x382/0x7fb [ 658.464829][ T1168] ? __warn_printk+0xf3/0xf3 [ 658.469450][ T1168] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 658.475127][ T1168] ? preempt_schedule_thunk+0x16/0x18 [ 658.480523][ T1168] ? watchdog.cold+0x5/0x16b [ 658.485134][ T1168] ? watchdog+0xa82/0x1000 [ 658.489568][ T1168] watchdog.cold+0x16/0x16b [ 658.494486][ T1168] ? reset_hung_task_detector+0x30/0x30 [ 658.502692][ T1168] kthread+0x3b5/0x4a0 [ 658.506812][ T1168] ? __kthread_bind_mask+0xc0/0xc0 [ 658.511943][ T1168] ret_from_fork+0x1f/0x30 [ 658.517906][ T1168] Kernel Offset: disabled [ 658.522250][ T1168] Rebooting in 86400 seconds..