0m] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.197' (ECDSA) to the list of known hosts. 2020/06/28 20:00:04 fuzzer started 2020/06/28 20:00:05 dialing manager at 10.128.0.105:36183 2020/06/28 20:00:05 syscalls: 3105 2020/06/28 20:00:05 code coverage: enabled 2020/06/28 20:00:05 comparison tracing: enabled 2020/06/28 20:00:05 extra coverage: enabled 2020/06/28 20:00:05 setuid sandbox: enabled 2020/06/28 20:00:05 namespace sandbox: enabled 2020/06/28 20:00:05 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/28 20:00:05 fault injection: enabled 2020/06/28 20:00:05 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/28 20:00:05 net packet injection: enabled 2020/06/28 20:00:05 net device setup: enabled 2020/06/28 20:00:05 concurrency sanitizer: enabled 2020/06/28 20:00:05 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/28 20:00:05 USB emulation: enabled 2020/06/28 20:00:06 suppressing KCSAN reports in functions: 'ext4_free_inode' 'do_epoll_wait' 'snd_rawmidi_drain_output' 'kauditd_thread' 'alloc_pid' 'futex_wait_queue_me' 'blk_mq_dispatch_rq_list' 'ext4_free_inodes_count' '__xa_clear_mark' 'do_signal_stop' '__ext4_new_inode' 'wbt_issue' 20:00:16 executing program 0: openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cpuacct.stat\x00', 0x0, 0x0) write(0xffffffffffffffff, &(0x7f0000000040)="0f42", 0x2) r0 = openat$kvm(0xffffffffffffff9c, &(0x7f00000000c0)='/dev/kvm\x00', 0x0, 0x0) r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0) getsockopt$inet6_opts(0xffffffffffffffff, 0x29, 0x0, &(0x7f0000000580)=""/143, &(0x7f0000000340)=0xfee5) setsockopt$inet6_MRT6_ADD_MFC(0xffffffffffffffff, 0x29, 0xcc, &(0x7f00000002c0)={{0xa, 0x0, 0x0, @loopback}, {0xa, 0x0, 0x0, @rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01'}, 0x0, [0x0, 0x0, 0x0, 0x1000]}, 0x5c) ioctl$KVM_SET_USER_MEMORY_REGION(r1, 0x4020ae46, &(0x7f0000000740)={0x3, 0x2, 0xf000, 0x1000, &(0x7f0000000000/0x1000)=nil}) r2 = ioctl$KVM_CREATE_VCPU(r1, 0xae41, 0x0) ioctl$KVM_SET_USER_MEMORY_REGION(r1, 0x4020ae46, &(0x7f0000000100)={0x0, 0x0, 0x0, 0x2000, &(0x7f0000000000/0x2000)=nil}) ioctl$KVM_SET_REGS(r2, 0x4090ae82, &(0x7f0000000200)={[0x0, 0x0, 0x0, 0x0, 0x0, 0x8, 0xfb, 0x0, 0x6, 0x0, 0x400000000000000]}) ioctl$KVM_RUN(r2, 0xae80, 0x0) recvfrom$inet(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000440)={0x2, 0x4e20, @remote}, 0x10) sendmsg$IPVS_CMD_DEL_DEST(0xffffffffffffffff, &(0x7f0000000080)={0x0, 0x0, &(0x7f00000001c0)={&(0x7f0000000180)=ANY=[]}}, 0x0) ioctl$KVM_RUN(r2, 0xae80, 0x0) openat(0xffffffffffffffff, &(0x7f0000000000)='./file0\x00', 0x0, 0x0) r3 = socket$inet6_tcp(0xa, 0x1, 0x0) r4 = dup2(r3, r3) ioctl$PERF_EVENT_IOC_ENABLE(r4, 0x8912, 0x400200) ioctl$KVM_NMI(r2, 0xae9a) ioctl$KVM_SET_REGS(r2, 0x4090ae82, &(0x7f0000000380)) ioctl$KVM_RUN(r2, 0xae80, 0x0) syzkaller login: [ 42.519499][ T8647] IPVS: ftp: loaded support on port[0] = 21 20:00:16 executing program 1: r0 = openat$kvm(0xffffffffffffff9c, &(0x7f0000000200)='/dev/kvm\x00', 0x0, 0x0) r1 = ioctl$KVM_CREATE_VM(r0, 0xae01, 0x0) r2 = ioctl$KVM_CREATE_VCPU(r1, 0xae41, 0x0) r3 = socket$inet6(0xa, 0x2, 0x0) r4 = dup(r3) ioctl$PERF_EVENT_IOC_ENABLE(r4, 0x8912, 0x400200) ioctl$KVM_SET_TSC_KHZ(r2, 0xaea2, 0x8) [ 42.593154][ T8647] chnl_net:caif_netlink_parms(): no params data found [ 42.624787][ T8647] bridge0: port 1(bridge_slave_0) entered blocking state [ 42.632115][ T8647] bridge0: port 1(bridge_slave_0) entered disabled state [ 42.640656][ T8647] device bridge_slave_0 entered promiscuous mode [ 42.648451][ T8647] bridge0: port 2(bridge_slave_1) entered blocking state [ 42.656087][ T8647] bridge0: port 2(bridge_slave_1) entered disabled state [ 42.663740][ T8647] device bridge_slave_1 entered promiscuous mode [ 42.679797][ T8647] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 42.690418][ T8647] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 42.708959][ T8647] team0: Port device team_slave_0 added [ 42.716393][ T8647] team0: Port device team_slave_1 added [ 42.730206][ T8647] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 42.737454][ T8647] 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. [ 42.771243][ T8647] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 42.786365][ T8801] IPVS: ftp: loaded support on port[0] = 21 [ 42.794935][ T8647] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 42.801872][ T8647] 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. [ 42.828669][ T8647] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active 20:00:16 executing program 2: r0 = socket$kcm(0xa, 0x5, 0x0) sendmsg(r0, &(0x7f00000006c0)={&(0x7f0000000100)=@in6={0xa, 0x0, 0x0, @rand_addr=' \x01\x00'}, 0x80, &(0x7f0000000400)=[{&(0x7f0000000440)="c4", 0x1}], 0x1}, 0x0) sendmsg$inet(r0, &(0x7f00000014c0)={&(0x7f0000000040)={0x2, 0x0, @private=0xa010100}, 0x10, &(0x7f0000001440)=[{&(0x7f0000000180)='p', 0x1}], 0x1}, 0x0) r1 = socket$kcm(0x10, 0x2, 0x4) sendmsg$kcm(r1, &(0x7f0000000080)={0x0, 0x0, &(0x7f0000000040)=[{&(0x7f0000000380)="480000001400e702095f9f95274b0a000a845865400402000000000000006fab078a6a36d47a56aa68c6f8c36d96bd7c497626ff00034000d90000000000000000634310e68b0c89", 0x48}], 0x1}, 0x0) r2 = socket$kcm(0x2b, 0x1, 0x0) ioctl$PERF_EVENT_IOC_ENABLE(r2, 0x8912, 0x400200) recvmsg(r1, &(0x7f0000000dc0)={0x0, 0xd805, 0x0}, 0x0) [ 42.894882][ T8647] device hsr_slave_0 entered promiscuous mode [ 42.904361][ T8647] device hsr_slave_1 entered promiscuous mode [ 42.992161][ T8813] IPVS: ftp: loaded support on port[0] = 21 20:00:17 executing program 3: r0 = socket$kcm(0x29, 0x5, 0x0) getsockopt$kcm_KCM_RECV_DISABLE(r0, 0x119, 0x4, 0x0, 0xfffffffffffffd5d) [ 43.104921][ T8813] chnl_net:caif_netlink_parms(): no params data found [ 43.124316][ T8647] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 43.166131][ T8647] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 43.225562][ T8647] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 43.264869][ T8647] netdevsim netdevsim0 netdevsim3: renamed from eth3 20:00:17 executing program 4: r0 = bpf$MAP_CREATE(0x0, &(0x7f00004f9fe4)={0x10, 0x4, 0x4, 0x4}, 0x40) bpf$MAP_UPDATE_ELEM(0x2, &(0x7f0000000080)={r0, &(0x7f00000001c0), &(0x7f0000000080), 0x1}, 0x20) [ 43.296820][ T8801] chnl_net:caif_netlink_parms(): no params data found [ 43.309834][ T9058] IPVS: ftp: loaded support on port[0] = 21 [ 43.357700][ T8647] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.364770][ T8647] bridge0: port 2(bridge_slave_1) entered forwarding state [ 43.372079][ T8647] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.379124][ T8647] bridge0: port 1(bridge_slave_0) entered forwarding state [ 43.420452][ T8801] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.428813][ T8801] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.436632][ T8801] device bridge_slave_0 entered promiscuous mode [ 43.447094][ T8801] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.454404][ T8801] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.461754][ T8801] device bridge_slave_1 entered promiscuous mode [ 43.479260][ T8813] bridge0: port 1(bridge_slave_0) entered blocking state [ 43.486554][ T8813] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.494284][ T8813] device bridge_slave_0 entered promiscuous mode [ 43.502034][ T8813] bridge0: port 2(bridge_slave_1) entered blocking state [ 43.510070][ T8813] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.517603][ T8813] device bridge_slave_1 entered promiscuous mode [ 43.529138][ T8801] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 43.559023][ T8813] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 43.572013][ T9153] IPVS: ftp: loaded support on port[0] = 21 [ 43.573334][ T8801] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 43.604443][ T8813] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 43.668057][ T8801] team0: Port device team_slave_0 added [ 43.676516][ T3318] bridge0: port 1(bridge_slave_0) entered disabled state [ 43.693294][ T3318] bridge0: port 2(bridge_slave_1) entered disabled state [ 43.719419][ T9058] chnl_net:caif_netlink_parms(): no params data found [ 43.731475][ T8813] team0: Port device team_slave_0 added [ 43.737636][ T8801] team0: Port device team_slave_1 added [ 43.745266][ T8647] 8021q: adding VLAN 0 to HW filter on device bond0 20:00:17 executing program 5: r0 = memfd_create(&(0x7f0000000000)='[wlan1keyring', 0x5) mmap(&(0x7f0000000000/0x2000)=nil, 0x2000, 0x0, 0x4d091, r0, 0x0) r1 = socket(0x1e, 0x2, 0x0) setsockopt$packet_tx_ring(r1, 0x10f, 0x87, &(0x7f0000000000), 0x10) [ 43.773361][ T8813] team0: Port device team_slave_1 added [ 43.801685][ T3393] ================================================================== [ 43.809775][ T3393] BUG: KCSAN: data-race in copy_process / copy_process [ 43.816595][ T3393] [ 43.818908][ T3393] write to 0xffffffff89279410 of 4 bytes by task 21 on cpu 0: [ 43.826353][ T3393] copy_process+0x2e84/0x3300 [ 43.831013][ T3393] _do_fork+0xf1/0x660 [ 43.835065][ T3393] kernel_thread+0x85/0xb0 [ 43.839466][ T3393] call_usermodehelper_exec_work+0x4f/0x1b0 [ 43.845344][ T3393] process_one_work+0x3e1/0x9a0 [ 43.850181][ T3393] worker_thread+0x665/0xbe0 [ 43.854757][ T3393] kthread+0x20d/0x230 [ 43.858811][ T3393] ret_from_fork+0x1f/0x30 [ 43.863198][ T3393] [ 43.865516][ T3393] read to 0xffffffff89279410 of 4 bytes by task 3393 on cpu 1: [ 43.873040][ T3393] copy_process+0xac4/0x3300 [ 43.877610][ T3393] _do_fork+0xf1/0x660 [ 43.881783][ T3393] kernel_thread+0x85/0xb0 [ 43.886168][ T3393] call_usermodehelper_exec_work+0x4f/0x1b0 [ 43.892046][ T3393] process_one_work+0x3e1/0x9a0 [ 43.896874][ T3393] worker_thread+0x665/0xbe0 [ 43.899663][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 43.901448][ T3393] kthread+0x20d/0x230 [ 43.910631][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 43.912658][ T3393] ret_from_fork+0x1f/0x30 [ 43.912660][ T3393] [ 43.912663][ T3393] Reported by Kernel Concurrency Sanitizer on: [ 43.912674][ T3393] CPU: 1 PID: 3393 Comm: kworker/u4:4 Not tainted 5.8.0-rc2-syzkaller #0 [ 43.912683][ T3393] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.921794][ T8647] 8021q: adding VLAN 0 to HW filter on device team0 [ 43.924236][ T3393] Workqueue: events_unbound call_usermodehelper_exec_work [ 43.924242][ T3393] ================================================================== [ 43.924247][ T3393] Kernel panic - not syncing: panic_on_warn set ... [ 43.924256][ T3393] CPU: 1 PID: 3393 Comm: kworker/u4:4 Not tainted 5.8.0-rc2-syzkaller #0 [ 43.924266][ T3393] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.931238][ T8801] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 43.932703][ T3393] Workqueue: events_unbound call_usermodehelper_exec_work [ 43.932708][ T3393] Call Trace: [ 43.932721][ T3393] dump_stack+0x10f/0x19d [ 43.932728][ T3393] panic+0x207/0x64a [ 43.932739][ T3393] ? vprintk_emit+0x44a/0x4f0 [ 43.932750][ T3393] kcsan_report+0x684/0x690 [ 43.932761][ T3393] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 43.932771][ T3393] ? copy_process+0xac4/0x3300 [ 43.932780][ T3393] ? _do_fork+0xf1/0x660 [ 43.932789][ T3393] ? kernel_thread+0x85/0xb0 [ 43.932798][ T3393] ? call_usermodehelper_exec_work+0x4f/0x1b0 [ 43.932814][ T3393] ? process_one_work+0x3e1/0x9a0 [ 43.942376][ T8801] 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. [ 43.951224][ T3393] ? worker_thread+0x665/0xbe0 [ 43.951233][ T3393] ? kthread+0x20d/0x230 [ 43.951245][ T3393] ? ret_from_fork+0x1f/0x30 [ 43.951267][ T3393] ? debug_smp_processor_id+0x18/0x20 [ 43.951280][ T3393] ? copy_creds+0x280/0x350 [ 43.951290][ T3393] ? copy_creds+0x280/0x350 [ 43.951301][ T3393] kcsan_setup_watchpoint+0x453/0x4d0 [ 43.951317][ T3393] ? copy_creds+0x280/0x350 [ 43.959228][ T8801] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 43.965086][ T3393] copy_process+0xac4/0x3300 [ 43.965101][ T3393] ? select_idle_sibling+0x258/0x430 [ 43.965112][ T3393] ? __rcu_read_unlock+0x4b/0x260 [ 43.965123][ T3393] ? proc_cap_handler+0x280/0x280 [ 43.965132][ T3393] _do_fork+0xf1/0x660 [ 43.965140][ T3393] ? enqueue_entity+0x25a/0x480 [ 43.965155][ T3393] ? proc_cap_handler+0x280/0x280 [ 43.978627][ T9341] IPVS: ftp: loaded support on port[0] = 21 [ 43.979766][ T3393] kernel_thread+0x85/0xb0 [ 43.997495][ T9153] chnl_net:caif_netlink_parms(): no params data found [ 43.998197][ T3393] ? proc_cap_handler+0x280/0x280 [ 44.008200][ T8813] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 44.012263][ T3393] call_usermodehelper_exec_work+0x4f/0x1b0 [ 44.019986][ T8813] 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. [ 44.023686][ T3393] process_one_work+0x3e1/0x9a0 [ 44.023698][ T3393] worker_thread+0x665/0xbe0 [ 44.023773][ T3393] ? finish_task_switch+0x8b/0x270 [ 44.028462][ T8813] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 44.033012][ T3393] ? process_one_work+0x9a0/0x9a0 [ 44.033021][ T3393] kthread+0x20d/0x230 [ 44.033031][ T3393] ? process_one_work+0x9a0/0x9a0 [ 44.033039][ T3393] ? kthread_blkcg+0x80/0x80 [ 44.033050][ T3393] ret_from_fork+0x1f/0x30 [ 44.034203][ T3393] Kernel Offset: disabled [ 44.284608][ T3393] Rebooting in 86400 seconds..