[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.94' (ECDSA) to the list of known hosts. 2019/12/04 12:18:41 fuzzer started 2019/12/04 12:18:43 dialing manager at 10.128.0.26:36481 2019/12/04 12:18:43 syscalls: 2691 2019/12/04 12:18:43 code coverage: enabled 2019/12/04 12:18:43 comparison tracing: enabled 2019/12/04 12:18:43 extra coverage: extra coverage is not supported by the kernel 2019/12/04 12:18:43 setuid sandbox: enabled 2019/12/04 12:18:43 namespace sandbox: enabled 2019/12/04 12:18:43 Android sandbox: /sys/fs/selinux/policy does not exist 2019/12/04 12:18:43 fault injection: enabled 2019/12/04 12:18:43 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/12/04 12:18:43 net packet injection: enabled 2019/12/04 12:18:43 net device setup: enabled 2019/12/04 12:18:43 concurrency sanitizer: /sys/kernel/debug/kcsan does not exist 2019/12/04 12:18:43 devlink PCI setup: PCI device 0000:00:10.0 is not available 12:18:44 executing program 0: unshare(0x8000000) shmget$private(0x0, 0xffffffffff000, 0x0, &(0x7f0000ffc000/0x3000)=nil) 12:18:44 executing program 1: r0 = openat$ocfs2_control(0xffffffffffffff9c, &(0x7f0000000040)='/dev/ocfs2_control\x00', 0x0, 0x0) r1 = socket$inet6_tcp(0xa, 0x1, 0x0) dup3(r1, r0, 0x0) syzkaller login: [ 56.734642][ T8261] IPVS: ftp: loaded support on port[0] = 21 [ 56.858254][ T8261] chnl_net:caif_netlink_parms(): no params data found [ 56.899235][ T8261] bridge0: port 1(bridge_slave_0) entered blocking state [ 56.906865][ T8261] bridge0: port 1(bridge_slave_0) entered disabled state [ 56.915063][ T8261] device bridge_slave_0 entered promiscuous mode [ 56.924486][ T8261] bridge0: port 2(bridge_slave_1) entered blocking state [ 56.932388][ T8261] bridge0: port 2(bridge_slave_1) entered disabled state [ 56.940507][ T8261] device bridge_slave_1 entered promiscuous mode [ 56.964165][ T8261] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 56.976370][ T8261] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 57.000607][ T8261] team0: Port device team_slave_0 added [ 57.009834][ T8261] team0: Port device team_slave_1 added [ 57.021111][ T8265] IPVS: ftp: loaded support on port[0] = 21 12:18:44 executing program 2: r0 = socket$alg(0x26, 0x5, 0x0) bind$alg(r0, &(0x7f0000000100)={0x26, 'hash\x00', 0x0, 0x0, 'xcbc(aes)\x00'}, 0x58) setsockopt$ALG_SET_KEY(r0, 0x117, 0x1, &(0x7f00000000c0)="0affefff7f000000001e6ea64aa8e1c9", 0x10) r1 = socket$isdn_base(0x22, 0x3, 0x0) close(r1) accept4(r0, 0x0, 0x0, 0x0) socketpair$unix(0x1, 0x1, 0x0, &(0x7f0000000440)={0xffffffffffffffff, 0xffffffffffffffff}) r3 = dup(r2) ioctl$PERF_EVENT_IOC_ENABLE(r3, 0x8912, 0x400200) sendmmsg$inet(r1, &(0x7f0000003380)=[{{0x0, 0x0, &(0x7f0000000080)=[{&(0x7f00000004c0)="408a4ad8b9cbc4c3a641ceac30b96286bd", 0x11}], 0x1}}], 0x1, 0x0) [ 57.069426][ T8261] device hsr_slave_0 entered promiscuous mode [ 57.106922][ T8261] device hsr_slave_1 entered promiscuous mode [ 57.211869][ T8267] IPVS: ftp: loaded support on port[0] = 21 [ 57.254539][ T8261] netdevsim netdevsim0 netdevsim0: renamed from eth0 12:18:44 executing program 3: r0 = openat$nullb(0xffffffffffffff9c, &(0x7f00000003c0)='/dev/nullb0\x00', 0x127000, 0x0) preadv(r0, &(0x7f0000000340)=[{0x0}, {&(0x7f0000000200)=""/195, 0x200002c3}, {&(0x7f0000000100)=""/9, 0x9}], 0x3, 0x0) [ 57.351445][ T8261] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 57.418659][ T8261] netdevsim netdevsim0 netdevsim2: renamed from eth2 12:18:45 executing program 4: setsockopt$inet_sctp_SCTP_RTOINFO(0xffffffffffffffff, 0x84, 0x0, &(0x7f0000001000)={0x10000, 0x4, 0xfffffc00}, 0x10) r0 = socket(0x11, 0x80002, 0x0) setsockopt$packet_int(r0, 0x107, 0xa, &(0x7f0000788000)=0x2, 0x4) setsockopt(r0, 0x107, 0xd, &(0x7f0000001000), 0xc5) [ 57.471446][ T8261] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 57.553616][ T8269] IPVS: ftp: loaded support on port[0] = 21 [ 57.656170][ T8265] chnl_net:caif_netlink_parms(): no params data found [ 57.712325][ T8272] IPVS: ftp: loaded support on port[0] = 21 12:18:45 executing program 5: r0 = socket$inet6(0xa, 0x3, 0x6b) ioctl(r0, 0x2001000008912, &(0x7f0000000000)="0815b5055e0bcfe87b3071") r1 = socket$rds(0x15, 0x5, 0x0) bind$rds(r1, &(0x7f0000000180)={0x2, 0x0, @loopback}, 0x10) sendmsg$rds(r1, &(0x7f00001c3000)={&(0x7f0000014000)={0x2, 0x0, @local}, 0x10, 0x0, 0x0, &(0x7f0000000840)=[@rdma_args={0x48, 0x114, 0x1, {{}, {0x0}, 0x0, 0x1a000}}], 0x48}, 0x0) [ 57.771547][ T8261] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.778822][ T8261] bridge0: port 2(bridge_slave_1) entered forwarding state [ 57.786770][ T8261] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.793862][ T8261] bridge0: port 1(bridge_slave_0) entered forwarding state [ 57.821754][ T8265] bridge0: port 1(bridge_slave_0) entered blocking state [ 57.838631][ T8265] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.847164][ T8265] device bridge_slave_0 entered promiscuous mode [ 57.855567][ T8265] bridge0: port 2(bridge_slave_1) entered blocking state [ 57.863135][ T8265] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.872092][ T8265] device bridge_slave_1 entered promiscuous mode [ 57.916373][ T49] bridge0: port 1(bridge_slave_0) entered disabled state [ 57.927145][ T49] bridge0: port 2(bridge_slave_1) entered disabled state [ 57.952925][ T8265] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 57.974947][ T8265] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 57.990290][ T8276] IPVS: ftp: loaded support on port[0] = 21 [ 58.005156][ T8267] chnl_net:caif_netlink_parms(): no params data found [ 58.046077][ T8265] team0: Port device team_slave_0 added [ 58.056249][ T8265] team0: Port device team_slave_1 added [ 58.085848][ T8269] chnl_net:caif_netlink_parms(): no params data found [ 58.118312][ T8267] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.125974][ T8267] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.134713][ T8267] device bridge_slave_0 entered promiscuous mode [ 58.144228][ T8267] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.151546][ T8267] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.159826][ T8267] device bridge_slave_1 entered promiscuous mode [ 58.268889][ T8265] device hsr_slave_0 entered promiscuous mode [ 58.317083][ T8265] device hsr_slave_1 entered promiscuous mode [ 58.367085][ T8265] debugfs: Directory 'hsr0' with parent '/' already present! [ 58.385971][ T8272] chnl_net:caif_netlink_parms(): no params data found [ 58.429414][ T8272] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.437458][ T8272] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.445184][ T8272] device bridge_slave_0 entered promiscuous mode [ 58.462279][ T8269] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.471348][ T8269] bridge0: port 1(bridge_slave_0) entered disabled state [ 58.479384][ T8269] device bridge_slave_0 entered promiscuous mode [ 58.487136][ T8269] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.494197][ T8269] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.502077][ T8269] device bridge_slave_1 entered promiscuous mode [ 58.510760][ T8267] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 58.520797][ T8272] bridge0: port 2(bridge_slave_1) entered blocking state [ 58.528430][ T8272] bridge0: port 2(bridge_slave_1) entered disabled state [ 58.536223][ T8272] device bridge_slave_1 entered promiscuous mode [ 58.562901][ T8267] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 58.589715][ T8272] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 58.602019][ T8269] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 58.625352][ T8267] team0: Port device team_slave_0 added [ 58.635322][ T8261] 8021q: adding VLAN 0 to HW filter on device bond0 [ 58.644069][ T8272] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 58.668987][ T8269] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 58.684802][ T8267] team0: Port device team_slave_1 added [ 58.697921][ T8272] team0: Port device team_slave_0 added [ 58.709728][ T8265] netdevsim netdevsim1 netdevsim0: renamed from eth0 [ 58.763312][ T8261] 8021q: adding VLAN 0 to HW filter on device team0 [ 58.795223][ T8272] team0: Port device team_slave_1 added [ 58.810457][ T8269] team0: Port device team_slave_0 added [ 58.816543][ T8265] netdevsim netdevsim1 netdevsim1: renamed from eth1 [ 58.856122][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 58.864413][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 58.886938][ T8269] team0: Port device team_slave_1 added [ 58.902342][ T8265] netdevsim netdevsim1 netdevsim2: renamed from eth2 [ 58.960021][ T3012] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 58.969358][ T3012] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 58.977843][ T3012] bridge0: port 1(bridge_slave_0) entered blocking state [ 58.985158][ T3012] bridge0: port 1(bridge_slave_0) entered forwarding state [ 59.029456][ T8267] device hsr_slave_0 entered promiscuous mode [ 59.087042][ T8267] device hsr_slave_1 entered promiscuous mode [ 59.136777][ T8267] debugfs: Directory 'hsr0' with parent '/' already present! [ 59.153277][ T8276] chnl_net:caif_netlink_parms(): no params data found [ 59.164759][ T8265] netdevsim netdevsim1 netdevsim3: renamed from eth3 [ 59.210710][ T8264] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 59.222219][ T8264] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 59.231438][ T8264] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.238630][ T8264] bridge0: port 2(bridge_slave_1) entered forwarding state [ 59.278607][ T8272] device hsr_slave_0 entered promiscuous mode [ 59.316947][ T8272] device hsr_slave_1 entered promiscuous mode [ 59.356714][ T8272] debugfs: Directory 'hsr0' with parent '/' already present! [ 59.438403][ T8269] device hsr_slave_0 entered promiscuous mode [ 59.476976][ T8269] device hsr_slave_1 entered promiscuous mode [ 59.546771][ T8269] debugfs: Directory 'hsr0' with parent '/' already present! [ 59.558376][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bond: link becomes ready [ 59.578269][ T8276] bridge0: port 1(bridge_slave_0) entered blocking state [ 59.585645][ T8276] bridge0: port 1(bridge_slave_0) entered disabled state [ 59.595762][ T8276] device bridge_slave_0 entered promiscuous mode [ 59.642271][ T8276] bridge0: port 2(bridge_slave_1) entered blocking state [ 59.650789][ T8276] bridge0: port 2(bridge_slave_1) entered disabled state [ 59.660167][ T8276] device bridge_slave_1 entered promiscuous mode [ 59.669708][ T3012] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bond: link becomes ready [ 59.678499][ T3012] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_team: link becomes ready [ 59.687571][ T3012] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 59.696263][ T3012] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_team: link becomes ready [ 59.705639][ T3012] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 59.721123][ T8272] netdevsim netdevsim4 netdevsim0: renamed from eth0 [ 59.800505][ T8267] netdevsim netdevsim2 netdevsim0: renamed from eth0 [ 59.838562][ T3012] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 59.846392][ T3012] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_hsr: link becomes ready [ 59.858071][ T3012] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 59.871839][ T8272] netdevsim netdevsim4 netdevsim1: renamed from eth1 [ 59.931004][ T8272] netdevsim netdevsim4 netdevsim2: renamed from eth2 [ 59.993876][ T8272] netdevsim netdevsim4 netdevsim3: renamed from eth3 [ 60.039407][ T8276] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 60.049152][ T8267] netdevsim netdevsim2 netdevsim1: renamed from eth1 [ 60.088483][ T8269] netdevsim netdevsim3 netdevsim0: renamed from eth0 [ 60.149530][ T3012] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_hsr: link becomes ready [ 60.158141][ T3012] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 60.170604][ T8261] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 60.180653][ T8276] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 60.190320][ T8267] netdevsim netdevsim2 netdevsim2: renamed from eth2 [ 60.241300][ T8267] netdevsim netdevsim2 netdevsim3: renamed from eth3 [ 60.298038][ T8269] netdevsim netdevsim3 netdevsim1: renamed from eth1 [ 60.340831][ T8269] netdevsim netdevsim3 netdevsim2: renamed from eth2 [ 60.394437][ T8269] netdevsim netdevsim3 netdevsim3: renamed from eth3 [ 60.481535][ T8276] team0: Port device team_slave_0 added [ 60.489495][ T8276] team0: Port device team_slave_1 added [ 60.500825][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 60.509232][ T49] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 60.522703][ T8261] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 60.590243][ T8276] device hsr_slave_0 entered promiscuous mode [ 60.637564][ T8276] device hsr_slave_1 entered promiscuous mode [ 60.697217][ T8276] debugfs: Directory 'hsr0' with parent '/' already present! [ 60.735831][ T8265] 8021q: adding VLAN 0 to HW filter on device bond0 [ 60.799965][ T8276] netdevsim netdevsim5 netdevsim0: renamed from eth0 [ 60.838975][ T8276] netdevsim netdevsim5 netdevsim1: renamed from eth1 [ 60.890426][ T8276] netdevsim netdevsim5 netdevsim2: renamed from eth2 [ 60.946362][ T8267] 8021q: adding VLAN 0 to HW filter on device bond0 [ 60.962475][ T8265] 8021q: adding VLAN 0 to HW filter on device team0 [ 165.936560][ C0] rcu: INFO: rcu_preempt self-detected stall on CPU [ 165.943536][ C0] rcu: 0-...!: (1 GPs behind) idle=d3e/1/0x4000000000000002 softirq=10993/10995 fqs=2 [ 165.953525][ C0] (t=10500 jiffies g=6457 q=281) [ 165.958546][ C0] rcu: rcu_preempt kthread starved for 10495 jiffies! g6457 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 [ 165.969638][ C0] rcu: RCU grace-period kthread stack dump: [ 165.975519][ C0] rcu_preempt R running task 29032 10 2 0x80004000 [ 165.984913][ C0] Call Trace: [ 165.988313][ C0] __schedule+0x9a0/0xcc0 [ 165.992663][ C0] schedule+0x181/0x210 [ 165.996816][ C0] schedule_timeout+0x14f/0x240 [ 166.001675][ C0] ? run_local_timers+0x120/0x120 [ 166.006697][ C0] rcu_gp_kthread+0xed8/0x1770 [ 166.011466][ C0] kthread+0x332/0x350 [ 166.015526][ C0] ? rcu_report_qs_rsp+0x140/0x140 [ 166.020899][ C0] ? kthread_blkcg+0xe0/0xe0 [ 166.025486][ C0] ret_from_fork+0x24/0x30 [ 166.029995][ C0] NMI backtrace for cpu 0 [ 166.034442][ C0] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.4.0-syzkaller #0 [ 166.042341][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 166.052458][ C0] Workqueue: 0x0 (bond0) [ 166.056780][ C0] Call Trace: [ 166.060055][ C0] [ 166.062994][ C0] dump_stack+0x1fb/0x318 [ 166.067327][ C0] nmi_cpu_backtrace+0xaf/0x1a0 [ 166.072179][ C0] ? nmi_trigger_cpumask_backtrace+0x16d/0x290 [ 166.078352][ C0] ? arch_trigger_cpumask_backtrace+0x20/0x20 [ 166.084417][ C0] nmi_trigger_cpumask_backtrace+0x174/0x290 [ 166.090396][ C0] arch_trigger_cpumask_backtrace+0x10/0x20 [ 166.096407][ C0] rcu_dump_cpu_stacks+0x15a/0x220 [ 166.101968][ C0] rcu_sched_clock_irq+0xe25/0x1ad0 [ 166.107413][ C0] ? trace_hardirqs_off+0x74/0x80 [ 166.112440][ C0] update_process_times+0x12d/0x180 [ 166.117637][ C0] tick_sched_timer+0x263/0x420 [ 166.122534][ C0] ? tick_setup_sched_timer+0x3d0/0x3d0 [ 166.128249][ C0] __hrtimer_run_queues+0x403/0x840 [ 166.133566][ C0] hrtimer_interrupt+0x38c/0xda0 [ 166.138524][ C0] ? debug_smp_processor_id+0x9/0x20 [ 166.143920][ C0] smp_apic_timer_interrupt+0x109/0x280 [ 166.149550][ C0] apic_timer_interrupt+0xf/0x20 [ 166.154503][ C0] [ 166.157438][ C0] RIP: 0010:mod_memcg_page_state+0x168/0x190 [ 166.163407][ C0] Code: c7 28 95 0a 89 e8 a8 9a 69 00 48 83 3d c8 20 c2 07 00 74 2d e8 19 25 2e 00 4c 89 ff 57 9d 0f 1f 44 00 00 5b 41 5c 41 5e 41 5f <5d> c3 e8 01 25 2e 00 0f 0b e8 fa 24 2e 00 0f 0b e8 f3 24 2e 00 0f [ 166.183720][ C0] RSP: 0018:ffffc90000dd7c20 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 166.192488][ C0] RAX: ffffffff81487433 RBX: ffff888097feca08 RCX: ffff8880a9ffa580 [ 166.200560][ C0] RDX: 0000000000000000 RSI: 00000000fffffffc RDI: ffffea00024fb6c0 [ 166.208549][ C0] RBP: ffffc90000dd7c20 R08: 000000000003a728 R09: ffffed1015011a97 [ 166.216603][ C0] R10: ffffed1015011a97 R11: 0000000000000000 R12: ffff888097fecaa0 [ 166.224570][ C0] R13: dffffc0000000000 R14: 1ffff11012ffd954 R15: ffff8880a808d4a8 [ 166.233599][ C0] ? mod_memcg_page_state+0x123/0x190 [ 166.238968][ C0] free_thread_stack+0x168/0x590 [ 166.243900][ C0] put_task_stack+0xa3/0x130 [ 166.248580][ C0] finish_task_switch+0x3f1/0x550 [ 166.253626][ C0] __schedule+0x9a8/0xcc0 [ 166.257957][ C0] schedule+0x181/0x210 [ 166.262105][ C0] worker_thread+0x10d6/0x1630 [ 166.266878][ C0] kthread+0x332/0x350 [ 166.270940][ C0] ? rcu_lock_release+0x30/0x30 [ 166.275784][ C0] ? kthread_blkcg+0xe0/0xe0 [ 166.280401][ C0] ret_from_fork+0x24/0x30