[ OK ] Found device /dev/ttyS0. [ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. syzkaller login: [ 704.932738][ T27] audit: type=1400 audit(1595961569.805:8): avc: denied { execmem } for pid=6826 comm="syz-executor495" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 704.952963][ T6827] IPVS: ftp: loaded support on port[0] = 21 [ 705.038294][ T6827] chnl_net:caif_netlink_parms(): no params data found [ 705.089477][ T6827] bridge0: port 1(bridge_slave_0) entered blocking state [ 705.097971][ T6827] bridge0: port 1(bridge_slave_0) entered disabled state [ 705.107335][ T6827] device bridge_slave_0 entered promiscuous mode [ 705.117591][ T6827] bridge0: port 2(bridge_slave_1) entered blocking state [ 705.125311][ T6827] bridge0: port 2(bridge_slave_1) entered disabled state [ 705.132963][ T6827] device bridge_slave_1 entered promiscuous mode [ 705.152753][ T6827] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 705.163793][ T6827] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 705.185901][ T6827] team0: Port device team_slave_0 added [ 705.193187][ T6827] team0: Port device team_slave_1 added [ 705.211746][ T6827] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 705.218815][ T6827] 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. [ 705.246540][ T6827] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 705.259278][ T6827] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 705.267379][ T6827] 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. [ 705.294219][ T6827] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 705.367974][ T6827] device hsr_slave_0 entered promiscuous mode [ 705.394963][ T6827] device hsr_slave_1 entered promiscuous mode [ 705.565485][ T6827] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 705.637955][ T6827] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 705.706988][ T6827] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 705.747335][ T6827] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 705.801280][ T6827] bridge0: port 2(bridge_slave_1) entered blocking state [ 705.808528][ T6827] bridge0: port 2(bridge_slave_1) entered forwarding state [ 705.816504][ T6827] bridge0: port 1(bridge_slave_0) entered blocking state [ 705.823566][ T6827] bridge0: port 1(bridge_slave_0) entered forwarding state [ 705.869571][ T6827] 8021q: adding VLAN 0 to HW filter on device bond0 [ 705.883063][ T6955] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 705.893397][ T6955] bridge0: port 1(bridge_slave_0) entered disabled state [ 705.902573][ T6955] bridge0: port 2(bridge_slave_1) entered disabled state [ 705.911543][ T6955] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 705.924118][ T6827] 8021q: adding VLAN 0 to HW filter on device team0 [ 705.936668][ T2599] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 705.945247][ T2599] bridge0: port 1(bridge_slave_0) entered blocking state [ 705.952316][ T2599] bridge0: port 1(bridge_slave_0) entered forwarding state [ 705.978021][ T7038] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 705.988165][ T7038] bridge0: port 2(bridge_slave_1) entered blocking state [ 705.995300][ T7038] bridge0: port 2(bridge_slave_1) entered forwarding state [ 706.003356][ T7038] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 706.013298][ T7038] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 706.030148][ T6827] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 706.040669][ T6827] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 706.055656][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 706.063501][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 706.072139][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 706.082003][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 706.102571][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 706.112271][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 706.126496][ T6827] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 706.144288][ T6955] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_virt_wifi: link becomes ready [ 706.155584][ T6955] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 706.175751][ T6955] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_vlan: link becomes ready [ 706.183922][ T6955] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 706.196405][ T7035] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 706.204209][ T7035] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 706.213425][ T6827] device veth0_vlan entered promiscuous mode [ 706.226966][ T6827] device veth1_vlan entered promiscuous mode [ 706.248404][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 706.257190][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 706.265693][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready [ 706.274163][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 706.285428][ T6827] device veth0_macvtap entered promiscuous mode [ 706.297402][ T6827] device veth1_macvtap entered promiscuous mode [ 706.315876][ T6827] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 706.323363][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 706.332322][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): macsec0: link becomes ready [ 706.341726][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 706.350705][ T2518] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 706.362840][ T6827] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 706.370247][ T7035] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 706.379624][ T7035] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready executing program [ 811.548978][ C1] rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: [ 811.556102][ C1] rcu: 0-...0: (0 ticks this GP) idle=746/1/0x4000000000000000 softirq=11126/11126 fqs=5250 [ 811.566524][ C1] (detected by 1, t=10502 jiffies, g=10173, q=4066) [ 811.573190][ C1] Sending NMI from CPU 1 to CPUs 0: [ 811.579502][ C1] NMI backtrace for cpu 0 [ 811.579509][ C1] CPU: 0 PID: 6827 Comm: syz-executor495 Not tainted 5.8.0-rc7-syzkaller #0 [ 811.579516][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 811.579521][ C1] RIP: 0010:_raw_spin_unlock_irqrestore+0x11/0xe0 [ 811.579533][ C1] Code: ff 48 c7 c7 90 e0 b4 89 e8 9c 94 ca f9 eb 8e 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 da 76 71 f9 48 89 ef e8 42 71 72 f9 f6 c7 02 75 3a 48 c7 c0 88 [ 811.579537][ C1] RSP: 0018:ffffc90000007ce8 EFLAGS: 00000082 [ 811.579546][ C1] RAX: 0000000000000000 RBX: 0000000000000082 RCX: ffffffff815afb70 [ 811.579552][ C1] RDX: 0000000000000000 RSI: ffffffff839b54c4 RDI: ffffffff8cb52258 [ 811.579558][ C1] RBP: ffffffff8cb52240 R08: ffffffff8cb52240 R09: 0000000000000003 [ 811.579564][ C1] R10: fffff52000000f8e R11: 0000000000000000 R12: dffffc0000000000 [ 811.579570][ C1] R13: ffffffff89bd0d40 R14: 1ffff92000000fa2 R15: ffff88809f6d5b40 [ 811.579576][ C1] FS: 0000000001936880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 [ 811.579581][ C1] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 811.579587][ C1] CR2: 0000000020000610 CR3: 000000009fe0b000 CR4: 00000000001406f0 [ 811.579592][ C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 811.579598][ C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 811.579601][ C1] Call Trace: [ 811.579604][ C1] [ 811.579608][ C1] debug_object_deactivate+0x264/0x300 [ 811.579612][ C1] ? debug_stats_show+0x230/0x230 [ 811.579616][ C1] ? timerqueue_add+0x1b9/0x310 [ 811.579621][ C1] ? lock_is_held_type+0xb0/0xe0 [ 811.579625][ C1] __hrtimer_run_queues+0x3cb/0xfc0 [ 811.579630][ C1] ? hrtimer_sleeper_start_expires+0x80/0x80 [ 811.579634][ C1] ? ktime_get_update_offsets_now+0x1c4/0x250 [ 811.579638][ C1] hrtimer_interrupt+0x32a/0x930 [ 811.579643][ C1] __sysvec_apic_timer_interrupt+0x142/0x5e0 [ 811.579647][ C1] asm_call_on_stack+0xf/0x20 [ 811.579650][ C1] [ 811.579654][ C1] sysvec_apic_timer_interrupt+0xe0/0x120 [ 811.579659][ C1] asm_sysvec_apic_timer_interrupt+0x12/0x20 [ 811.579663][ C1] RIP: 0010:on_each_cpu+0x149/0x240 [ 811.579675][ C1] Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 e6 00 00 00 48 83 3d cf 0d 4c 08 00 0f 84 af 00 00 00 e8 0c ea 0a 00 48 89 df 57 9d <0f> 1f 44 00 00 e8 fd e9 0a 00 bf 01 00 00 00 e8 13 a0 e6 ff 31 ff [ 811.579679][ C1] RSP: 0018:ffffc900017b7d70 EFLAGS: 00000293 [ 811.579687][ C1] RAX: 0000000000000000 RBX: 0000000000000293 RCX: 0000000000000000 [ 811.579693][ C1] RDX: ffff888096160580 RSI: ffffffff8168d2c4 RDI: 0000000000000293 [ 811.579706][ C1] RBP: 0000000000000200 R08: 0000000000000000 R09: 0000000000000000 [ 811.579712][ C1] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 [ 811.579718][ C1] R13: 0000000000000000 R14: ffffc900017b7ed0 R15: ffffffffa0df91df [ 811.579721][ C1] ? on_each_cpu+0x144/0x240 [ 811.579725][ C1] clock_was_set+0x18/0x20 [ 811.579729][ C1] do_settimeofday64+0x350/0x4e0 [ 811.579733][ C1] ? cap_capable+0x1eb/0x250 [ 811.579737][ C1] ? change_clocksource+0x200/0x200 [ 811.579741][ C1] ? capable+0xdd/0x100 [ 811.579745][ C1] do_sys_settimeofday64+0x1de/0x260 [ 811.579750][ C1] __x64_sys_clock_settime+0x197/0x260 [ 811.579753][ C1] ? exit_itimers+0x2d0/0x2d0 [ 811.579758][ C1] ? lock_is_held_type+0xb0/0xe0 [ 811.579761][ C1] ? do_syscall_64+0x1c/0xe0 [ 811.579766][ C1] ? lockdep_hardirqs_on_prepare+0x3a2/0x590 [ 811.579770][ C1] do_syscall_64+0x60/0xe0 [ 811.579775][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 811.579778][ C1] RIP: 0033:0x443849 [ 811.579790][ C1] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 0f fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 811.579795][ C1] RSP: 002b:00007ffc077ecab8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3 [ 811.579805][ C1] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443849 [ 811.579811][ C1] RDX: 0000000000443849 RSI: 0000000020000380 RDI: 0000000000000000 [ 811.579816][ C1] RBP: 00007ffc077ecac0 R08: 0000000001bbbbbb R09: 0000000001bbbbbb [ 811.579822][ C1] R10: 0000000001bbbbbb R11: 0000000000000246 R12: 00007ffc077ecad0 [ 811.579828][ C1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000