[ 28.748110] random: sshd: uninitialized urandom read (32 bytes read) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 [ 30.050643] random: sshd: uninitialized urandom read (32 bytes read) syzkaller login: [ 30.290924] random: sshd: uninitialized urandom read (32 bytes read) [ 30.806919] random: sshd: uninitialized urandom read (32 bytes read) [ 229.523516] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.21' (ECDSA) to the list of known hosts. [ 235.063545] random: sshd: uninitialized urandom read (32 bytes read) [ 235.184334] kauditd_printk_skb: 10 callbacks suppressed [ 235.184343] audit: type=1400 audit(1568369558.141:36): avc: denied { map } for pid=6857 comm="syz-executor883" path="/root/syz-executor883525764" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 235.441089] IPVS: ftp: loaded support on port[0] = 21 [ 236.239558] chnl_net:caif_netlink_parms(): no params data found [ 236.272510] bridge0: port 1(bridge_slave_0) entered blocking state [ 236.279159] bridge0: port 1(bridge_slave_0) entered disabled state [ 236.286708] device bridge_slave_0 entered promiscuous mode [ 236.293774] bridge0: port 2(bridge_slave_1) entered blocking state [ 236.300226] bridge0: port 2(bridge_slave_1) entered disabled state [ 236.307033] device bridge_slave_1 entered promiscuous mode [ 236.321443] bond0: Enslaving bond_slave_0 as an active interface with an up link [ 236.329997] bond0: Enslaving bond_slave_1 as an active interface with an up link [ 236.345982] IPv6: ADDRCONF(NETDEV_UP): team_slave_0: link is not ready [ 236.353383] team0: Port device team_slave_0 added [ 236.358723] IPv6: ADDRCONF(NETDEV_UP): team_slave_1: link is not ready [ 236.365881] team0: Port device team_slave_1 added [ 236.371154] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_0: link is not ready [ 236.378319] IPv6: ADDRCONF(NETDEV_UP): bridge_slave_1: link is not ready [ 236.432240] device hsr_slave_0 entered promiscuous mode [ 236.500309] device hsr_slave_1 entered promiscuous mode [ 236.580505] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_0: link is not ready [ 236.587418] IPv6: ADDRCONF(NETDEV_UP): hsr_slave_1: link is not ready [ 236.601811] bridge0: port 2(bridge_slave_1) entered blocking state [ 236.608213] bridge0: port 2(bridge_slave_1) entered forwarding state [ 236.615114] bridge0: port 1(bridge_slave_0) entered blocking state [ 236.621525] bridge0: port 1(bridge_slave_0) entered forwarding state [ 236.647347] IPv6: ADDRCONF(NETDEV_UP): bond0: link is not ready [ 236.655036] 8021q: adding VLAN 0 to HW filter on device bond0 [ 236.662965] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 236.671713] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 236.689832] bridge0: port 1(bridge_slave_0) entered disabled state [ 236.696909] bridge0: port 2(bridge_slave_1) entered disabled state [ 236.706327] IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready [ 236.712702] 8021q: adding VLAN 0 to HW filter on device team0 [ 236.720842] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 236.728370] bridge0: port 1(bridge_slave_0) entered blocking state [ 236.734752] bridge0: port 1(bridge_slave_0) entered forwarding state [ 236.743862] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 236.752022] bridge0: port 2(bridge_slave_1) entered blocking state [ 236.758351] bridge0: port 2(bridge_slave_1) entered forwarding state [ 236.776353] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 236.786608] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 236.798460] IPv6: ADDRCONF(NETDEV_UP): hsr0: link is not ready [ 236.805974] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 236.813748] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 236.821666] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 236.829147] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 236.837292] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready executing program executing program executing program executing program [ 236.844069] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 236.856163] IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready [ 236.865347] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 341.890025] INFO: rcu_preempt self-detected stall on CPU [ 341.895543] 1-...: (10499 ticks this GP) idle=33e/140000000000001/0 softirq=10144/10144 fqs=38 [ 341.904441] (t=10500 jiffies g=1026 c=1025 q=208) [ 341.909447] rcu_preempt kthread starved for 10422 jiffies! g1026 c1025 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=0 [ 341.920086] rcu_preempt I29776 8 2 0x80000000 [ 341.925818] Call Trace: [ 341.928544] __schedule+0x7b8/0x1cd0 [ 341.932245] ? pci_mmcfg_check_reserved+0x150/0x150 [ 341.937240] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 341.942329] schedule+0x92/0x1c0 [ 341.945678] schedule_timeout+0x43e/0xe10 [ 341.949804] ? usleep_range+0x130/0x130 [ 341.953759] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 341.958891] ? prepare_to_swait+0xcc/0x100 [ 341.963109] ? call_timer_fn+0x670/0x670 [ 341.967178] rcu_gp_kthread+0xbf4/0x1ec0 [ 341.971232] ? force_qs_rnp+0x4d0/0x4d0 [ 341.975193] kthread+0x319/0x430 [ 341.978626] ? force_qs_rnp+0x4d0/0x4d0 [ 341.982591] ? kthread_create_on_node+0xd0/0xd0 [ 341.987241] ret_from_fork+0x24/0x30 [ 341.991124] NMI backtrace for cpu 1 [ 341.994908] CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.14.143 #0 [ 342.001380] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 342.010776] Workqueue: ipv6_addrconf addrconf_dad_work [ 342.016032] Call Trace: [ 342.018595] [ 342.020782] dump_stack+0x138/0x197 [ 342.024393] nmi_cpu_backtrace.cold+0x57/0x94 [ 342.028869] ? irq_force_complete_move.cold+0x7d/0x7d [ 342.034213] nmi_trigger_cpumask_backtrace+0x141/0x189 [ 342.039489] arch_trigger_cpumask_backtrace+0x14/0x20 [ 342.044659] rcu_dump_cpu_stacks+0x186/0x1d2 [ 342.049063] rcu_check_callbacks.cold+0x43d/0xd0a [ 342.053887] ? rcu_lockdep_current_cpu_online+0xf2/0x140 [ 342.059325] update_process_times+0x31/0x70 [ 342.063629] tick_sched_handle+0x85/0x160 [ 342.067783] tick_sched_timer+0x43/0x130 [ 342.072607] __hrtimer_run_queues+0x270/0xbc0 [ 342.078050] ? tick_sched_do_timer+0xe0/0xe0 [ 342.082465] ? hrtimer_start_range_ns+0x10d0/0x10d0 [ 342.087470] hrtimer_interrupt+0x1d8/0x5d0 [ 342.091734] smp_apic_timer_interrupt+0x11c/0x5e0 [ 342.096575] apic_timer_interrupt+0x96/0xa0 [ 342.100889] [ 342.103141] RIP: 0010:hhf_dequeue+0x605/0xa60 [ 342.107805] RSP: 0018:ffff8880a9d6f010 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 [ 342.115494] RAX: 1ffff11012badc53 RBX: ffff888095d6e1f8 RCX: 0000000000000000 [ 342.122759] RDX: 0000000000000000 RSI: ffff888095d6e290 RDI: ffff888095d6e298 [ 342.130027] RBP: ffff8880a9d6f060 R08: 0000000000000000 R09: ffff8880a9d5eec8 [ 342.137888] R10: ffff8880a9d5eea8 R11: ffff8880a9d5e4c0 R12: dffffc0000000000 [ 342.145138] R13: ffff888095d6e000 R14: ffff888095d6e290 R15: ffff888095d6e280 [ 342.152921] __qdisc_run+0x2b8/0xe00 [ 342.156654] __dev_queue_xmit+0x1571/0x25e0 [ 342.160958] ? __lock_is_held+0xb6/0x140 [ 342.165016] ? check_preemption_disabled+0x3c/0x250 [ 342.170042] ? netdev_pick_tx+0x300/0x300 [ 342.174487] ? save_trace+0x290/0x290 [ 342.178346] ? br_nf_post_routing+0x27d/0xf00 [ 342.182851] ? br_forward_finish+0x1cc/0x320 [ 342.187243] ? find_held_lock+0x35/0x130 [ 342.191291] ? br_forward_finish+0x1cc/0x320 [ 342.195689] dev_queue_xmit+0x18/0x20 [ 342.199467] ? dev_queue_xmit+0x18/0x20 [ 342.203424] br_dev_queue_push_xmit+0x367/0x530 [ 342.208073] br_forward_finish+0xbc/0x320 [ 342.212469] ? br_dev_queue_push_xmit+0x530/0x530 [ 342.217295] ? br_fdb_add.cold+0x84/0x84 [ 342.221337] __br_forward+0x560/0x9c0 [ 342.225119] ? br_forward_finish+0x320/0x320 [ 342.229517] ? br_dev_queue_push_xmit+0x530/0x530 [ 342.234519] deliver_clone+0x61/0xc0 [ 342.238211] br_flood+0x3c8/0x530 [ 342.241650] br_dev_xmit+0x9a4/0xd40 [ 342.245345] ? check_preemption_disabled+0x3c/0x250 [ 342.250352] ? br_poll_controller+0x10/0x10 [ 342.254676] ? rcu_lockdep_current_cpu_online+0xf2/0x140 [ 342.260128] dev_hard_start_xmit+0x18c/0x8b0 [ 342.264621] ? assoc_array_gc+0x11b0/0x11d0 [ 342.268934] __dev_queue_xmit+0x1d95/0x25e0 [ 342.273263] ? trace_hardirqs_on+0x10/0x10 [ 342.277492] ? netdev_pick_tx+0x300/0x300 [ 342.281659] ? ip6_finish_output2+0x9ab/0x21b0 [ 342.286360] ? memcpy+0x46/0x50 [ 342.289652] dev_queue_xmit+0x18/0x20 [ 342.293440] ? dev_queue_xmit+0x18/0x20 [ 342.297471] neigh_resolve_output+0x4d8/0x870 [ 342.301961] ip6_finish_output2+0x9ab/0x21b0 [ 342.306368] ? ip6_forward_finish+0x480/0x480 [ 342.310846] ? lock_downgrade+0x6e0/0x6e0 [ 342.314977] ip6_finish_output+0x4f4/0xb50 [ 342.319191] ? ip6_finish_output+0x4f4/0xb50 [ 342.323591] ip6_output+0x20f/0x6d0 [ 342.327286] ? ip6_finish_output+0xb50/0xb50 [ 342.331677] ? __lock_is_held+0xb6/0x140 [ 342.335727] ? ip6_fragment+0x32c0/0x32c0 [ 342.339922] ndisc_send_skb+0xb56/0x11e0 [ 342.343970] ? ndisc_error_report+0x190/0x190 [ 342.348470] ndisc_send_ns+0x360/0x7e0 [ 342.352339] ? ndisc_netdev_event+0x3b0/0x3b0 [ 342.356820] ? trace_hardirqs_on_caller+0x400/0x590 [ 342.361832] ? addrconf_dad_work+0x97c/0xff0 [ 342.366220] ? trace_hardirqs_on+0xd/0x10 [ 342.370348] ? __local_bh_enable_ip+0x99/0x1a0 [ 342.374911] addrconf_dad_work+0xa40/0xff0 [ 342.379130] ? addrconf_dad_completed+0xa70/0xa70 [ 342.383953] ? rcu_lockdep_current_cpu_online+0xf2/0x140 [ 342.389386] process_one_work+0x863/0x1600 [ 342.394302] ? pwq_dec_nr_in_flight+0x2e0/0x2e0 [ 342.398978] worker_thread+0x5d9/0x1050 [ 342.402941] kthread+0x319/0x430 [ 342.406288] ? process_one_work+0x1600/0x1600 [ 342.410764] ? kthread_create_on_node+0xd0/0xd0 [ 342.415422] ret_from_fork+0x24/0x30 [ 342.420031] INFO: rcu_sched detected stalls on CPUs/tasks: [ 342.425691] 1-...: (1 GPs behind) idle=33e/140000000000000/0 softirq=10143/10144 fqs=38 [ 342.433987] (detected by 0, t=10553 jiffies, g=696, c=695, q=9) [ 342.440128] Sending NMI from CPU 0 to CPUs 1: [ 342.445368] NMI backtrace for cpu 1 [ 342.445372] CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.14.143 #0 [ 342.445376] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 342.445378] Workqueue: ipv6_addrconf addrconf_dad_work [ 342.445382] task: ffff8880a9d5e4c0 task.stack: ffff8880a9d68000 [ 342.445385] RIP: 0010:__list_add_valid+0x2b/0xa0 [ 342.445387] RSP: 0018:ffff8880a9d6efe8 EFLAGS: 00000246 [ 342.445391] RAX: dffffc0000000000 RBX: ffff888095d6e1f8 RCX: 0000000000000000 [ 342.445394] RDX: 1ffff11012badc53 RSI: ffff888095d6e290 RDI: ffff888095d6e298 [ 342.445397] RBP: ffff8880a9d6f000 R08: 0000000000000000 R09: ffff8880a9d5eec8 [ 342.445400] R10: ffff8880a9d5eea8 R11: ffff8880a9d5e4c0 R12: ffff888095d6e290 [ 342.445403] R13: ffff888095d6e1f8 R14: ffff888095d6e290 R15: ffff888095d6e280 [ 342.445406] FS: 0000000000000000(0000) GS:ffff8880aef00000(0000) knlGS:0000000000000000 [ 342.445408] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 342.445411] CR2: 00000000006dab10 CR3: 000000000766a000 CR4: 00000000001406e0 [ 342.445414] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 342.445417] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 342.445418] Call Trace: [ 342.445420] hhf_dequeue+0x61b/0xa60 [ 342.445422] __qdisc_run+0x2b8/0xe00 [ 342.445424] __dev_queue_xmit+0x1571/0x25e0 [ 342.445426] ? __lock_is_held+0xb6/0x140 [ 342.445428] ? check_preemption_disabled+0x3c/0x250 [ 342.445430] ? netdev_pick_tx+0x300/0x300 [ 342.445433] ? save_trace+0x290/0x290 [ 342.445435] ? br_nf_post_routing+0x27d/0xf00 [ 342.445437] ? br_forward_finish+0x1cc/0x320 [ 342.445439] ? find_held_lock+0x35/0x130 [ 342.445442] ? br_forward_finish+0x1cc/0x320 [ 342.445444] dev_queue_xmit+0x18/0x20 [ 342.445446] ? dev_queue_xmit+0x18/0x20 [ 342.445448] br_dev_queue_push_xmit+0x367/0x530 [ 342.445450] br_forward_finish+0xbc/0x320 [ 342.445453] ? br_dev_queue_push_xmit+0x530/0x530 [ 342.445455] ? br_fdb_add.cold+0x84/0x84 [ 342.445457] __br_forward+0x560/0x9c0 [ 342.445459] ? br_forward_finish+0x320/0x320 [ 342.445461] ? br_dev_queue_push_xmit+0x530/0x530 [ 342.445463] deliver_clone+0x61/0xc0 [ 342.445465] br_flood+0x3c8/0x530 [ 342.445467] br_dev_xmit+0x9a4/0xd40 [ 342.445469] ? check_preemption_disabled+0x3c/0x250 [ 342.445471] ? br_poll_controller+0x10/0x10 [ 342.445473] ? rcu_lockdep_current_cpu_online+0xf2/0x140 [ 342.445476] dev_hard_start_xmit+0x18c/0x8b0 [ 342.445478] ? assoc_array_gc+0x11b0/0x11d0 [ 342.445480] __dev_queue_xmit+0x1d95/0x25e0 [ 342.445482] ? trace_hardirqs_on+0x10/0x10 [ 342.445484] ? netdev_pick_tx+0x300/0x300 [ 342.445486] ? ip6_finish_output2+0x9ab/0x21b0 [ 342.445488] ? memcpy+0x46/0x50 [ 342.445489] dev_queue_xmit+0x18/0x20 [ 342.445491] ? dev_queue_xmit+0x18/0x20 [ 342.445493] neigh_resolve_output+0x4d8/0x870 [ 342.445495] ip6_finish_output2+0x9ab/0x21b0 [ 342.445497] ? ip6_forward_finish+0x480/0x480 [ 342.445499] ? lock_downgrade+0x6e0/0x6e0 [ 342.445502] ip6_finish_output+0x4f4/0xb50 [ 342.445504] ? ip6_finish_output+0x4f4/0xb50 [ 342.445505] ip6_output+0x20f/0x6d0 [ 342.445507] ? ip6_finish_output+0xb50/0xb50 [ 342.445509] ? __lock_is_held+0xb6/0x140 [ 342.445511] ? ip6_fragment+0x32c0/0x32c0 [ 342.445513] ndisc_send_skb+0xb56/0x11e0 [ 342.445515] ? ndisc_error_report+0x190/0x190 [ 342.445517] ndisc_send_ns+0x360/0x7e0 [ 342.445520] ? ndisc_netdev_event+0x3b0/0x3b0 [ 342.445522] ? trace_hardirqs_on_caller+0x400/0x590 [ 342.445524] ? addrconf_dad_work+0x97c/0xff0 [ 342.445526] ? trace_hardirqs_on+0xd/0x10 [ 342.445528] ? __local_bh_enable_ip+0x99/0x1a0 [ 342.445530] addrconf_dad_work+0xa40/0xff0 [ 342.445532] ? addrconf_dad_completed+0xa70/0xa70 [ 342.445534] ? rcu_lockdep_current_cpu_online+0xf2/0x140 [ 342.445536] process_one_work+0x863/0x1600 [ 342.445539] ? pwq_dec_nr_in_flight+0x2e0/0x2e0 [ 342.445541] worker_thread+0x5d9/0x1050 [ 342.445542] kthread+0x319/0x430 [ 342.445544] ? process_one_work+0x1600/0x1600 [ 342.445547] ? kthread_create_on_node+0xd0/0xd0 [ 342.445549] ret_from_fork+0x24/0x30 [ 342.445550] Code: 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 55 49 89 fd 48 8d 7a 08 41 54 49 89 d4 48 89 fa 48 83 ec 08 48 c1 ea 03 80 3c 02 00 <75> 52 49 8b 54 24 08 48 39 f2 0f 85 5a 01 00 00 48 b8 00 00 00 [ 342.445758] rcu_sched kthread starved for 10477 jiffies! g696 c695 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=0 [ 342.860085] rcu_sched I29824 9 2 0x80000000 [ 342.865715] Call Trace: [ 342.868316] __schedule+0x7b8/0x1cd0 [ 342.872027] ? pci_mmcfg_check_reserved+0x150/0x150 [ 342.877031] ? _raw_spin_unlock_irqrestore+0x6b/0xe0 [ 342.882136] schedule+0x92/0x1c0 [ 342.885491] schedule_timeout+0x43e/0xe10 [ 342.889632] ? usleep_range+0x130/0x130 [ 342.893767] ? _raw_spin_unlock_irqrestore+0xa4/0xe0 [ 342.898861] ? prepare_to_swait+0xcc/0x100 [ 342.903087] ? call_timer_fn+0x670/0x670 [ 342.907144] rcu_gp_kthread+0xbf4/0x1ec0 [ 342.911212] ? force_qs_rnp+0x4d0/0x4d0 [ 342.915179] kthread+0x319/0x430 [ 342.918530] ? force_qs_rnp+0x4d0/0x4d0 [ 342.922489] ? kthread_create_on_node+0xd0/0xd0 [ 342.927160] ret_from_fork+0x24/0x30