[ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Load/Save RF Kill Switch Status. [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.142' (ECDSA) to the list of known hosts. 2020/07/28 01:19:43 parsed 1 programs 2020/07/28 01:19:43 executed programs: 0 syzkaller login: [ 1584.704564][ T6863] IPVS: ftp: loaded support on port[0] = 21 [ 1584.804188][ T6863] chnl_net:caif_netlink_parms(): no params data found [ 1584.852676][ T6863] bridge0: port 1(bridge_slave_0) entered blocking state [ 1584.860388][ T6863] bridge0: port 1(bridge_slave_0) entered disabled state [ 1584.869388][ T6863] device bridge_slave_0 entered promiscuous mode [ 1584.879014][ T6863] bridge0: port 2(bridge_slave_1) entered blocking state [ 1584.886093][ T6863] bridge0: port 2(bridge_slave_1) entered disabled state [ 1584.894510][ T6863] device bridge_slave_1 entered promiscuous mode [ 1584.914958][ T6863] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 1584.925891][ T6863] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 1584.948592][ T6863] team0: Port device team_slave_0 added [ 1584.955866][ T6863] team0: Port device team_slave_1 added [ 1584.974105][ T6863] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 1584.981226][ T6863] 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. [ 1585.008594][ T6863] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 1585.021949][ T6863] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 1585.029510][ T6863] 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. [ 1585.056044][ T6863] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 1585.120804][ T6863] device hsr_slave_0 entered promiscuous mode [ 1585.147794][ T6863] device hsr_slave_1 entered promiscuous mode [ 1585.274624][ T6863] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 1585.340377][ T6863] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 1585.410687][ T6863] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 1585.469952][ T6863] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 1585.526306][ T6863] bridge0: port 2(bridge_slave_1) entered blocking state [ 1585.533821][ T6863] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1585.542113][ T6863] bridge0: port 1(bridge_slave_0) entered blocking state [ 1585.549292][ T6863] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1585.595859][ T6863] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1585.609705][ T2519] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1585.622392][ T2519] bridge0: port 1(bridge_slave_0) entered disabled state [ 1585.631231][ T2519] bridge0: port 2(bridge_slave_1) entered disabled state [ 1585.640160][ T2519] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1585.652666][ T6863] 8021q: adding VLAN 0 to HW filter on device team0 [ 1585.664071][ T6926] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1585.673436][ T6926] bridge0: port 1(bridge_slave_0) entered blocking state [ 1585.680595][ T6926] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1585.700722][ T7074] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1585.710507][ T7074] bridge0: port 2(bridge_slave_1) entered blocking state [ 1585.717777][ T7074] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1585.740816][ T7073] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1585.750155][ T7073] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1585.758989][ T7073] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1585.767232][ T7073] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1585.777082][ T7073] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1585.799886][ T6926] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 1585.808531][ T6926] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 1585.822649][ T6863] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1585.841637][ T7073] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 1585.850842][ T7073] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 1585.875547][ T6926] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 1585.885169][ T6926] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 1585.897601][ T6863] device veth0_vlan entered promiscuous mode [ 1585.909593][ T6830] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 1585.919319][ T6830] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 1585.929402][ T6863] device veth1_vlan entered promiscuous mode [ 1585.950828][ T7073] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 1585.959942][ T7073] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 1585.968578][ T7073] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 1585.977063][ T7073] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 1585.988525][ T6863] device veth0_macvtap entered promiscuous mode [ 1585.999954][ T6863] device veth1_macvtap entered promiscuous mode [ 1586.019526][ T6863] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 1586.032043][ T6830] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 1586.041557][ T6830] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 1586.050563][ T6830] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 1586.059697][ T6830] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 1586.072075][ T6863] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 1586.081104][ T6830] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 1586.090171][ T6830] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 1656.348970][ T0] NOHZ: local_softirq_pending 08 [ 1691.337448][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 1691.344198][ C0] rcu: 0-....: (1 GPs behind) idle=a32/1/0x4000000000000000 softirq=8991/8992 fqs=5250 [ 1691.354164][ C0] (t=10502 jiffies g=9457 q=376) [ 1691.359176][ C0] NMI backtrace for cpu 0 [ 1691.363482][ C0] CPU: 0 PID: 7078 Comm: syz-executor.0 Not tainted 5.8.0-rc7-syzkaller #0 [ 1691.372052][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1691.382087][ C0] Call Trace: [ 1691.385365][ C0] [ 1691.388210][ C0] dump_stack+0x18f/0x20d [ 1691.392523][ C0] nmi_cpu_backtrace.cold+0x70/0xb1 [ 1691.397707][ C0] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 1691.403650][ C0] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 1691.409617][ C0] rcu_dump_cpu_stacks+0x194/0x1cf [ 1691.414714][ C0] rcu_sched_clock_irq.cold+0x5b3/0xccc [ 1691.420334][ C0] ? lock_is_held_type+0xb0/0xe0 [ 1691.425270][ C0] ? rcutree_dead_cpu+0x10/0x10 [ 1691.430103][ C0] ? lockdep_hardirqs_off+0x66/0xa0 [ 1691.435279][ C0] ? trace_hardirqs_off+0x27/0x210 [ 1691.440372][ C0] update_process_times+0x25/0x60 [ 1691.446429][ C0] tick_sched_handle+0x9b/0x180 [ 1691.451256][ C0] tick_sched_timer+0x108/0x290 [ 1691.456171][ C0] __hrtimer_run_queues+0x1d5/0xfc0 [ 1691.461360][ C0] ? can_stop_idle_tick+0x290/0x290 [ 1691.466542][ C0] ? hrtimer_sleeper_start_expires+0x80/0x80 [ 1691.472518][ C0] ? ktime_get_update_offsets_now+0x1c4/0x250 [ 1691.478580][ C0] hrtimer_interrupt+0x32a/0x930 [ 1691.483524][ C0] __sysvec_apic_timer_interrupt+0x142/0x5e0 [ 1691.489538][ C0] asm_call_on_stack+0xf/0x20 [ 1691.494192][ C0] [ 1691.497123][ C0] sysvec_apic_timer_interrupt+0xe0/0x120 [ 1691.502836][ C0] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 1691.508818][ C0] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0xd/0x20 [ 1691.515574][ C0] Code: 24 0f b7 d6 0f b7 f7 bf 03 00 00 00 e9 cc fe ff ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c 24 89 f2 89 fe bf 05 00 00 00 ae fe ff ff 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 48 8b 0c [ 1691.535271][ C0] RSP: 0018:ffffc90001dd76e8 EFLAGS: 00000206 [ 1691.541413][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8395f2ab [ 1691.549498][ C0] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 [ 1691.559707][ C0] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff8880883314bf [ 1691.567667][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a872b600 [ 1691.575627][ C0] R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 [ 1691.583607][ C0] ? iov_iter_copy_from_user_atomic+0x62b/0xbe0 [ 1691.589830][ C0] iov_iter_copy_from_user_atomic+0x62b/0xbe0 [ 1691.595881][ C0] generic_perform_write+0x277/0x4f0 [ 1691.601146][ C0] ? generic_file_readonly_mmap+0x1b0/0x1b0 [ 1691.607021][ C0] ? down_write_killable+0x170/0x170 [ 1691.612302][ C0] ext4_buffered_write_iter+0x235/0x4a0 [ 1691.617848][ C0] ext4_file_write_iter+0x1f3/0x13d0 [ 1691.623216][ C0] ? lock_acquire+0x1f1/0xad0 [ 1691.627888][ C0] ? aa_path_link+0x2f0/0x2f0 [ 1691.632545][ C0] ? ext4_buffered_write_iter+0x4a0/0x4a0 [ 1691.638242][ C0] ? lock_release+0x8d0/0x8d0 [ 1691.642917][ C0] ? lock_is_held_type+0xb0/0xe0 [ 1691.647836][ C0] do_iter_readv_writev+0x567/0x780 [ 1691.653034][ C0] ? get_order+0x20/0x20 [ 1691.657273][ C0] ? apparmor_file_permission+0x26e/0x4e0 [ 1691.662988][ C0] do_iter_write+0x188/0x5f0 [ 1691.667580][ C0] ? iter_file_splice_write+0x170/0xbe0 [ 1691.673116][ C0] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 1691.678649][ C0] ? trace_kmalloc+0xfd/0x130 [ 1691.683414][ C0] vfs_iter_write+0x70/0xa0 [ 1691.687918][ C0] iter_file_splice_write+0x721/0xbe0 [ 1691.693295][ C0] ? __do_compat_sys_vmsplice+0x260/0x260 [ 1691.699269][ C0] ? lock_release+0x8d0/0x8d0 [ 1691.703931][ C0] ? __sb_start_write+0x1d5/0x470 [ 1691.708952][ C0] ? __do_compat_sys_vmsplice+0x260/0x260 [ 1691.714659][ C0] do_splice+0xbcd/0x1820 [ 1691.718982][ C0] ? lock_downgrade+0x820/0x820 [ 1691.723817][ C0] ? __might_fault+0x190/0x1d0 [ 1691.728569][ C0] ? splice_from_pipe+0x140/0x140 [ 1691.733571][ C0] ? __fget_files+0x294/0x400 [ 1691.738228][ C0] __x64_sys_splice+0x198/0x250 [ 1691.744203][ C0] do_syscall_64+0x60/0xe0 [ 1691.748610][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 1691.754482][ C0] RIP: 0033:0x45c369 [ 1691.758368][ C0] Code: 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 1691.777958][ C0] RSP: 002b:00007f0f0f750c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 [ 1691.786355][ C0] RAX: ffffffffffffffda RBX: 0000000000032240 RCX: 000000000045c369 [ 1691.794395][ C0] RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000006 [ 1691.802359][ C0] RBP: 000000000078bf58 R08: 000000000000ffe0 R09: 0000000000000000 [ 1691.810334][ C0] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c [ 1691.818309][ C0] R13: 00007ffee11cb08f R14: 00007f0f0f7519c0 R15: 000000000078bf0c