[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Started OpenBSD Secure Shell server. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.55' (ECDSA) to the list of known hosts. syzkaller login: [ 513.815296][ T6828] IPVS: ftp: loaded support on port[0] = 21 [ 513.911851][ T6828] chnl_net:caif_netlink_parms(): no params data found [ 513.963688][ T6828] bridge0: port 1(bridge_slave_0) entered blocking state [ 513.971138][ T6828] bridge0: port 1(bridge_slave_0) entered disabled state [ 513.980009][ T6828] device bridge_slave_0 entered promiscuous mode [ 513.989798][ T6828] bridge0: port 2(bridge_slave_1) entered blocking state [ 513.997655][ T6828] bridge0: port 2(bridge_slave_1) entered disabled state [ 514.005709][ T6828] device bridge_slave_1 entered promiscuous mode [ 514.025974][ T6828] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 514.036692][ T6828] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 514.058996][ T6828] team0: Port device team_slave_0 added [ 514.066221][ T6828] team0: Port device team_slave_1 added [ 514.084362][ T6828] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 514.091335][ T6828] batman_adv: batadv0: The MTU of interface batadv_slave_0 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 514.117720][ T6828] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 514.130048][ T6828] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 514.137279][ T6828] batman_adv: batadv0: The MTU of interface batadv_slave_1 is too small (1500) to handle the transport of batman-adv packets. Packets going over this interface will be fragmented on layer2 which could impact the performance. Setting the MTU to 1560 would solve the problem. [ 514.163288][ T6828] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 514.190019][ T6828] device hsr_slave_0 entered promiscuous mode [ 514.196721][ T6828] device hsr_slave_1 entered promiscuous mode [ 514.291955][ T6828] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 514.301563][ T6828] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 514.312089][ T6828] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 514.322589][ T6828] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 514.347911][ T6828] bridge0: port 2(bridge_slave_1) entered blocking state [ 514.355046][ T6828] bridge0: port 2(bridge_slave_1) entered forwarding state [ 514.362541][ T6828] bridge0: port 1(bridge_slave_0) entered blocking state [ 514.369651][ T6828] bridge0: port 1(bridge_slave_0) entered forwarding state [ 514.415727][ T6828] 8021q: adding VLAN 0 to HW filter on device bond0 [ 514.429591][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 514.441006][ T2602] bridge0: port 1(bridge_slave_0) entered disabled state [ 514.449681][ T2602] bridge0: port 2(bridge_slave_1) entered disabled state [ 514.457899][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 514.470592][ T6828] 8021q: adding VLAN 0 to HW filter on device team0 [ 514.482378][ T3915] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 514.491303][ T3915] bridge0: port 1(bridge_slave_0) entered blocking state [ 514.498483][ T3915] bridge0: port 1(bridge_slave_0) entered forwarding state [ 514.509957][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 514.519161][ T2602] bridge0: port 2(bridge_slave_1) entered blocking state [ 514.526270][ T2602] bridge0: port 2(bridge_slave_1) entered forwarding state [ 514.545870][ T3915] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 514.554820][ T3915] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 514.567751][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 514.584440][ T3915] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 514.592581][ T3915] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 514.605116][ T6828] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 514.623465][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 514.630818][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 514.645166][ T6828] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 514.665113][ T3915] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 514.684250][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 514.692405][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 514.701063][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 514.711265][ T6828] device veth0_vlan entered promiscuous mode [ 514.724233][ T6828] device veth1_vlan entered promiscuous mode [ 514.745974][ T3915] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 514.755051][ T3915] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 514.763419][ T3915] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 514.774452][ T6828] device veth0_macvtap entered promiscuous mode [ 514.785857][ T6828] device veth1_macvtap entered promiscuous mode [ 514.804192][ T6828] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 514.811490][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 514.821264][ T2602] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 514.834135][ T6828] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 514.843270][ T3915] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 514.853706][ T6828] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 514.862506][ T6828] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 514.871282][ T6828] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 514.880409][ T6828] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 517.326503][ C1] hrtimer: interrupt took 2404344428 ns [ 622.362951][ C0] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 622.370048][ C0] rcu: 1-...!: (2 ticks this GP) idle=71e/1/0x4000000000000000 softirq=8988/8988 fqs=0 [ 622.380033][ C0] (detected by 0, t=10502 jiffies, g=9369, q=287) [ 622.386523][ C0] Sending NMI from CPU 0 to CPUs 1: [ 622.393818][ C0] NMI backtrace for cpu 1 [ 622.393825][ C0] CPU: 1 PID: 3915 Comm: kworker/1:3 Not tainted 5.8.0-syzkaller #0 [ 622.393832][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 622.393836][ C0] Workqueue: events iterate_cleanup_work [ 622.393844][ C0] RIP: 0010:lock_release+0x196/0x8e0 [ 622.393856][ C0] Code: 3f 0f 87 0a 05 00 00 89 db be 08 00 00 00 48 89 d8 48 c1 f8 06 48 8d 3c c5 c8 ea b1 8a e8 72 9a 59 00 48 0f a3 1d 42 7a 57 09 <0f> 82 54 04 00 00 48 c7 c0 3c 1d b2 8a c7 44 24 40 01 00 00 00 48 [ 622.393861][ C0] RSP: 0018:ffffc90000da8d08 EFLAGS: 00000047 [ 622.393869][ C0] RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff815a707e [ 622.393875][ C0] RDX: fffffbfff1563d5a RSI: 0000000000000008 RDI: ffffffff8ab1eac8 [ 622.393881][ C0] RBP: 1ffff920001b51a3 R08: 0000000000000000 R09: ffffffff8ab1eacf [ 622.393886][ C0] R10: fffffbfff1563d59 R11: 0000000000000000 R12: ffff8880ae727758 [ 622.393892][ C0] R13: ffffffff816492c1 R14: ffff88808e3de340 R15: dffffc0000000000 [ 622.393898][ C0] FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 [ 622.393903][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 622.393909][ C0] CR2: 0000000020000610 CR3: 0000000009a8d000 CR4: 00000000001506e0 [ 622.393915][ C0] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 622.393921][ C0] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 622.393924][ C0] Call Trace: [ 622.393927][ C0] [ 622.393931][ C0] ? lock_downgrade+0x830/0x830 [ 622.393935][ C0] ? timerqueue_add+0x1b9/0x310 [ 622.393939][ C0] _raw_spin_unlock_irqrestore+0x16/0xe0 [ 622.393943][ C0] __hrtimer_run_queues+0x5d1/0xfc0 [ 622.393948][ C0] ? taprio_dequeue_soft+0xa40/0xa40 [ 622.393952][ C0] ? lockdep_hardirqs_off+0x70/0xc0 [ 622.393957][ C0] ? hrtimer_sleeper_start_expires+0x80/0x80 [ 622.393961][ C0] ? ktime_get_update_offsets_now+0x1c4/0x250 [ 622.393965][ C0] hrtimer_interrupt+0x32a/0x930 [ 622.393970][ C0] __sysvec_apic_timer_interrupt+0x142/0x5e0 [ 622.393974][ C0] asm_call_on_stack+0xf/0x20 [ 622.393977][ C0] [ 622.393981][ C0] sysvec_apic_timer_interrupt+0xb2/0xf0 [ 622.393986][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 622.393990][ C0] RIP: 0010:lock_acquire+0x27b/0xad0 [ 622.394002][ C0] Code: 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 f8 06 00 00 48 83 3d 0a ba 5b 08 00 0f 84 a6 05 00 00 48 8b 7c 24 08 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 10 48 c7 [ 622.394007][ C0] RSP: 0018:ffffc90000f07ab8 EFLAGS: 00000286 [ 622.394015][ C0] RAX: 1ffffffff136c689 RBX: ffff888098da25c0 RCX: ffffffff815a221b [ 622.394021][ C0] RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 [ 622.394027][ C0] RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff8c5eea97 [ 622.394033][ C0] R10: fffffbfff18bdd52 R11: 0000000000000000 R12: 0000000000000000 [ 622.394038][ C0] R13: ffffffff89a6aed8 R14: 0000000000000000 R15: ffff888098da25c0 [ 622.394042][ C0] ? __lock_acquire+0x16cb/0x5640 [ 622.394046][ C0] ? lock_release+0x8e0/0x8e0 [ 622.394050][ C0] ? mark_held_locks+0x9f/0xe0 [ 622.394054][ C0] ? lock_is_held_type+0xbb/0xf0 [ 622.394058][ C0] _raw_spin_lock+0x2a/0x40 [ 622.394063][ C0] ? nf_ct_iterate_cleanup+0x102/0x330 [ 622.394067][ C0] nf_ct_iterate_cleanup+0x102/0x330 [ 622.394071][ C0] ? nf_ct_port_nlattr_to_tuple+0x1d0/0x1d0 [ 622.394076][ C0] nf_ct_iterate_cleanup_net+0x113/0x170 [ 622.394081][ C0] ? nf_nat_masquerade_inet_unregister_notifiers+0x70/0x70 [ 622.394086][ C0] ? nf_ct_iterate_cleanup+0x330/0x330 [ 622.394091][ C0] ? nf_nat_masquerade_inet_unregister_notifiers+0x70/0x70 [ 622.394095][ C0] ? _raw_spin_unlock_irq+0x1f/0x80 [ 622.394099][ C0] ? _raw_spin_unlock_irq+0x1f/0x80 [ 622.394103][ C0] iterate_cleanup_work+0x45/0x130 [ 622.394108][ C0] process_one_work+0x94c/0x1670 [ 622.394111][ C0] ? lock_release+0x8e0/0x8e0 [ 622.394116][ C0] ? pwq_dec_nr_in_flight+0x2d0/0x2d0 [ 622.394120][ C0] ? rwlock_bug.part.0+0x90/0x90 [ 622.394124][ C0] worker_thread+0x64c/0x1120 [ 622.394128][ C0] ? __kthread_parkme+0x13f/0x1e0 [ 622.394132][ C0] ? process_one_work+0x1670/0x1670 [ 622.394136][ C0] kthread+0x3b5/0x4a0 [ 622.394140][ C0] ? __kthread_bind_mask+0xc0/0xc0 [ 622.394144][ C0] ? __kthread_bind_mask+0xc0/0xc0 [ 622.394148][ C0] ret_from_fork+0x1f/0x30 [ 622.394154][ C0] INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 0.000 msecs [ 622.394172][ C0] rcu: rcu_preempt kthread starved for 10502 jiffies! g9369 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 [ 622.844657][ C0] rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. [ 622.854617][ C0] rcu: RCU grace-period kthread stack dump: [ 622.860514][ C0] rcu_preempt I29080 10 2 0x00004000 [ 622.866855][ C0] Call Trace: [ 622.870165][ C0] __schedule+0x8e5/0x21e0 [ 622.874591][ C0] ? io_schedule_timeout+0x140/0x140 [ 622.880026][ C0] ? __free_object+0xdd0/0xdd0 [ 622.884791][ C0] ? lock_downgrade+0x830/0x830 [ 622.889655][ C0] schedule+0xd0/0x2a0 [ 622.893728][ C0] schedule_timeout+0x148/0x250 [ 622.898573][ C0] ? usleep_range+0x170/0x170 [ 622.903241][ C0] ? lockdep_hardirqs_on+0x76/0xf0 [ 622.908349][ C0] ? __next_timer_interrupt+0x210/0x210 [ 622.913960][ C0] ? prepare_to_swait_exclusive+0x2d0/0x2d0 [ 622.920648][ C0] rcu_gp_kthread+0xae5/0x1b50 [ 622.925457][ C0] ? rcu_qs+0x110/0x110 [ 622.929632][ C0] ? _raw_spin_unlock_irqrestore+0x62/0xe0 [ 622.935449][ C0] ? lockdep_hardirqs_on_prepare+0x354/0x530 [ 622.941540][ C0] ? lockdep_hardirqs_on+0x76/0xf0 [ 622.946673][ C0] ? __kthread_parkme+0x13f/0x1e0 [ 622.951826][ C0] ? rcu_qs+0x110/0x110 [ 622.955987][ C0] kthread+0x3b5/0x4a0 [ 622.960053][ C0] ? __kthread_bind_mask+0xc0/0xc0 [ 622.965158][ C0] ? __kthread_bind_mask+0xc0/0xc0 [ 622.970266][ C0] ret_from_fork+0x1f/0x30