[ 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 '10.128.0.213' (ECDSA) to the list of known hosts. 2020/07/27 05:34:01 parsed 1 programs 2020/07/27 05:34:01 executed programs: 0 syzkaller login: [ 1048.601110][ T6860] IPVS: ftp: loaded support on port[0] = 21 [ 1048.710643][ T6860] chnl_net:caif_netlink_parms(): no params data found [ 1048.765175][ T6860] bridge0: port 1(bridge_slave_0) entered blocking state [ 1048.774223][ T6860] bridge0: port 1(bridge_slave_0) entered disabled state [ 1048.785024][ T6860] device bridge_slave_0 entered promiscuous mode [ 1048.794830][ T6860] bridge0: port 2(bridge_slave_1) entered blocking state [ 1048.801943][ T6860] bridge0: port 2(bridge_slave_1) entered disabled state [ 1048.810103][ T6860] device bridge_slave_1 entered promiscuous mode [ 1048.831291][ T6860] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 1048.843309][ T6860] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 1048.865709][ T6860] team0: Port device team_slave_0 added [ 1048.873796][ T6860] team0: Port device team_slave_1 added [ 1048.892195][ T6860] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 1048.899421][ T6860] 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. [ 1048.926833][ T6860] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 1048.939746][ T6860] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 1048.946938][ T6860] 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. [ 1048.975640][ T6860] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 1049.035542][ T6860] device hsr_slave_0 entered promiscuous mode [ 1049.092459][ T6860] device hsr_slave_1 entered promiscuous mode [ 1049.234751][ T6860] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 1049.275273][ T6860] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 1049.324834][ T6860] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 1049.364848][ T6860] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 1049.418863][ T6860] bridge0: port 2(bridge_slave_1) entered blocking state [ 1049.426162][ T6860] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1049.434174][ T6860] bridge0: port 1(bridge_slave_0) entered blocking state [ 1049.441247][ T6860] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1049.488024][ T6860] 8021q: adding VLAN 0 to HW filter on device bond0 [ 1049.502189][ T2577] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 1049.513104][ T2577] bridge0: port 1(bridge_slave_0) entered disabled state [ 1049.521300][ T2577] bridge0: port 2(bridge_slave_1) entered disabled state [ 1049.530208][ T2577] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 1049.544410][ T6860] 8021q: adding VLAN 0 to HW filter on device team0 [ 1049.556424][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 1049.566274][ T17] bridge0: port 1(bridge_slave_0) entered blocking state [ 1049.573454][ T17] bridge0: port 1(bridge_slave_0) entered forwarding state [ 1049.593339][ T2577] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 1049.601753][ T2577] bridge0: port 2(bridge_slave_1) entered blocking state [ 1049.608892][ T2577] bridge0: port 2(bridge_slave_1) entered forwarding state [ 1049.630289][ T6860] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 1049.641276][ T6860] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 1049.654972][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 1049.664280][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 1049.672893][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 1049.681771][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 1049.691172][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 1049.699813][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 1049.721791][ T6860] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 1049.729973][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 1049.738281][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 1049.759186][ T7070] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 1049.768722][ T7070] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 1049.791062][ T6860] device veth0_vlan entered promiscuous mode [ 1049.799614][ T2577] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 1049.809253][ T2577] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 1049.819361][ T2577] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 1049.828888][ T2577] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 1049.842551][ T6860] device veth1_vlan entered promiscuous mode [ 1049.865677][ T2577] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 1049.875443][ T2577] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 1049.884475][ T2577] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 1049.894004][ T2577] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 1049.905397][ T6860] device veth0_macvtap entered promiscuous mode [ 1049.916323][ T6860] device veth1_macvtap entered promiscuous mode [ 1049.933603][ T6860] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 1049.941095][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 1049.950381][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 1049.959626][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 1049.969100][ T17] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 1049.981486][ T6860] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 1049.989542][ T2577] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 1049.999231][ T2577] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 1050.011556][ T6860] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 1050.020821][ T6860] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 1050.030710][ T6860] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 1050.041078][ T6860] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 1155.231245][ C1] rcu: INFO: rcu_preempt self-detected stall on CPU [ 1155.238042][ C1] rcu: 1-....: (10499 ticks this GP) idle=0da/1/0x4000000000000000 softirq=8294/8294 fqs=5231 [ 1155.249190][ C1] (t=10500 jiffies g=9385 q=442) [ 1155.254220][ C1] NMI backtrace for cpu 1 [ 1155.258532][ C1] CPU: 1 PID: 7079 Comm: syz-executor.0 Not tainted 5.8.0-rc6-next-20200724-syzkaller #0 [ 1155.269259][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1155.279637][ C1] Call Trace: [ 1155.282939][ C1] [ 1155.285911][ C1] dump_stack+0x18f/0x20d [ 1155.290235][ C1] nmi_cpu_backtrace.cold+0x44/0xd7 [ 1155.295672][ C1] ? lapic_can_unplug_cpu.cold+0x38/0x38 [ 1155.301294][ C1] nmi_trigger_cpumask_backtrace+0x1b3/0x223 [ 1155.307358][ C1] rcu_dump_cpu_stacks+0x194/0x1cf [ 1155.312468][ C1] rcu_sched_clock_irq.cold+0x5b3/0xcbd [ 1155.318158][ C1] ? lock_is_held_type+0xbb/0xf0 [ 1155.323075][ C1] ? rcutree_dead_cpu+0x10/0x10 [ 1155.327912][ C1] ? lockdep_hardirqs_off+0x6a/0xb0 [ 1155.333115][ C1] ? trace_hardirqs_off+0x27/0x210 [ 1155.338243][ C1] update_process_times+0x25/0x60 [ 1155.343304][ C1] tick_sched_handle+0x9b/0x180 [ 1155.348134][ C1] tick_sched_timer+0x108/0x290 [ 1155.352966][ C1] __hrtimer_run_queues+0x1d5/0xfc0 [ 1155.358139][ C1] ? can_stop_idle_tick+0x290/0x290 [ 1155.363319][ C1] ? hrtimer_sleeper_start_expires+0x80/0x80 [ 1155.369286][ C1] ? ktime_get_update_offsets_now+0x1c4/0x250 [ 1155.375507][ C1] hrtimer_interrupt+0x32a/0x930 [ 1155.380429][ C1] __sysvec_apic_timer_interrupt+0x142/0x5e0 [ 1155.386451][ C1] asm_call_on_stack+0xf/0x20 [ 1155.391101][ C1] [ 1155.394031][ C1] sysvec_apic_timer_interrupt+0xb2/0xf0 [ 1155.399652][ C1] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 1155.405722][ C1] RIP: 0010:iov_iter_copy_from_user_atomic+0x582/0xbe0 [ 1155.412566][ C1] Code: d2 74 09 80 fa 03 0f 8e 93 05 00 00 8b 68 08 48 89 44 24 38 ba 00 10 00 00 8b 44 24 14 8b 4c 24 20 44 29 fd 81 e1 ff 0f 00 00 <39> c5 0f 47 e8 29 ca 89 4c 24 30 39 d5 0f 47 ea 31 ff 89 ee e8 a5 [ 1155.432583][ C1] RSP: 0018:ffffc900061e7750 EFLAGS: 00000246 [ 1155.438639][ C1] RAX: 00000000000000d2 RBX: 0000000000000000 RCX: 0000000000000000 [ 1155.446861][ C1] RDX: 0000000000001000 RSI: ffffffff8398da05 RDI: ffff88809f013408 [ 1155.455173][ C1] RBP: 0000000000000000 R08: 0000000000000000 R09: ffff888087b5b57f [ 1155.463123][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809f013400 [ 1155.471093][ C1] R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 [ 1155.479071][ C1] ? iov_iter_copy_from_user_atomic+0x4f5/0xbe0 [ 1155.485520][ C1] generic_perform_write+0x277/0x4f0 [ 1155.490806][ C1] ? generic_file_readonly_mmap+0x1b0/0x1b0 [ 1155.496682][ C1] ? down_write_killable+0x170/0x170 [ 1155.502026][ C1] ext4_buffered_write_iter+0x235/0x4a0 [ 1155.507553][ C1] ext4_file_write_iter+0x1f3/0x13d0 [ 1155.512942][ C1] ? aa_file_perm+0x5e2/0x1100 [ 1155.517744][ C1] ? lock_acquire+0x1f1/0xad0 [ 1155.522494][ C1] ? pipe_lock+0x5a/0x70 [ 1155.526720][ C1] ? aa_path_link+0x2f0/0x2f0 [ 1155.531498][ C1] ? ext4_buffered_write_iter+0x4a0/0x4a0 [ 1155.537204][ C1] ? lock_release+0x8e0/0x8e0 [ 1155.541887][ C1] ? lock_is_held_type+0xbb/0xf0 [ 1155.547066][ C1] do_iter_readv_writev+0x567/0x780 [ 1155.552260][ C1] ? new_sync_write+0x650/0x650 [ 1155.557092][ C1] ? apparmor_file_permission+0x26e/0x4e0 [ 1155.562797][ C1] do_iter_write+0x188/0x630 [ 1155.567425][ C1] ? rcu_read_lock_sched_held+0x3a/0xb0 [ 1155.573081][ C1] ? trace_kmalloc+0xfd/0x130 [ 1155.577800][ C1] ? iter_file_splice_write+0x170/0xbe0 [ 1155.583329][ C1] vfs_iter_write+0x70/0xa0 [ 1155.587821][ C1] iter_file_splice_write+0x721/0xbe0 [ 1155.593363][ C1] ? __do_compat_sys_vmsplice+0x260/0x260 [ 1155.599082][ C1] ? lock_release+0x8e0/0x8e0 [ 1155.603747][ C1] ? __sb_start_write+0x1d5/0x470 [ 1155.608760][ C1] ? __do_compat_sys_vmsplice+0x260/0x260 [ 1155.614456][ C1] do_splice+0xbb8/0x17a0 [ 1155.618787][ C1] ? splice_from_pipe+0x140/0x140 [ 1155.623792][ C1] __x64_sys_splice+0x198/0x250 [ 1155.628623][ C1] do_syscall_64+0x60/0xe0 [ 1155.633019][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 1155.638898][ C1] RIP: 0033:0x45c369 [ 1155.642863][ C1] Code: Bad RIP value. [ 1155.646914][ C1] RSP: 002b:00007fb2d739ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 [ 1155.655303][ C1] RAX: ffffffffffffffda RBX: 0000000000032240 RCX: 000000000045c369 [ 1155.663339][ C1] RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000006 [ 1155.671289][ C1] RBP: 000000000078bf58 R08: 000000000000ffe0 R09: 0000000000000000 [ 1155.679237][ C1] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c [ 1155.687190][ C1] R13: 00007ffe3367ac4f R14: 00007fb2d739f9c0 R15: 000000000078bf0c