[ OK ] 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 '10.128.0.167' (ECDSA) to the list of known hosts. 2020/06/24 02:42:16 fuzzer started 2020/06/24 02:42:16 dialing manager at 10.128.0.105:34509 2020/06/24 02:42:16 checking machine... 2020/06/24 02:42:16 checking revisions... 2020/06/24 02:42:16 testing simple program... syzkaller login: [ 31.866351][ T8642] IPVS: ftp: loaded support on port[0] = 21 2020/06/24 02:42:16 building call list... [ 32.157503][ T264] tipc: TX() has been purged, node left! [ 34.234591][ T8628] can: request_module (can-proto-0) failed. [ 34.244007][ T8628] can: request_module (can-proto-0) failed. [ 34.253221][ T8628] can: request_module (can-proto-0) failed. 2020/06/24 02:42:22 syscalls: 3103 2020/06/24 02:42:22 code coverage: enabled 2020/06/24 02:42:22 comparison tracing: enabled 2020/06/24 02:42:22 extra coverage: enabled 2020/06/24 02:42:22 setuid sandbox: enabled 2020/06/24 02:42:22 namespace sandbox: enabled 2020/06/24 02:42:22 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/24 02:42:22 fault injection: enabled 2020/06/24 02:42:22 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/24 02:42:22 net packet injection: enabled 2020/06/24 02:42:22 net device setup: enabled 2020/06/24 02:42:22 concurrency sanitizer: enabled 2020/06/24 02:42:22 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/24 02:42:22 USB emulation: enabled 02:42:23 executing program 0: sendmsg$TIPC_NL_NET_SET(0xffffffffffffffff, &(0x7f00000002c0)={0x0, 0x0, &(0x7f0000000280)={&(0x7f0000000080)={0x20, 0x0, 0x0, 0x0, 0x0, {}, [@TIPC_NLA_NODE={0xc, 0x6, 0x0, 0x1, [@TIPC_NLA_NODE_ADDR={0x8}]}]}, 0x20}}, 0x0) r0 = socket$nl_generic(0x10, 0x3, 0x10) r1 = syz_genetlink_get_family_id$tipc2(&(0x7f0000000100)='TIPCv2\x00') sendmsg$TIPC_NL_MEDIA_SET(r0, &(0x7f0000000240)={0x0, 0x0, &(0x7f0000000200)={&(0x7f0000000080)={0x2c, r1, 0x1, 0x0, 0x0, {0xb}, [@TIPC_NLA_MEDIA={0x18}]}, 0x2c}}, 0x0) [ 38.476512][ T8720] IPVS: ftp: loaded support on port[0] = 21 [ 38.525786][ T8720] chnl_net:caif_netlink_parms(): no params data found [ 38.556937][ T8720] bridge0: port 1(bridge_slave_0) entered blocking state [ 38.564037][ T8720] bridge0: port 1(bridge_slave_0) entered disabled state [ 38.571698][ T8720] device bridge_slave_0 entered promiscuous mode [ 38.579534][ T8720] bridge0: port 2(bridge_slave_1) entered blocking state [ 38.586919][ T8720] bridge0: port 2(bridge_slave_1) entered disabled state [ 38.594811][ T8720] device bridge_slave_1 entered promiscuous mode [ 38.609943][ T8720] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link 02:42:23 executing program 1: clone(0x2101000ffc, 0x0, 0xfffffffffffffffe, 0x0, 0xffffffffffffffff) r0 = syz_open_dev$usbfs(&(0x7f0000000080)='/dev/bus/usb/00#/00#\x00', 0x4000000000000073, 0x68001) ioctl$USBDEVFS_CONTROL(r0, 0xc0185500, &(0x7f0000000000)={0x23, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0}) [ 38.620552][ T8720] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 38.637330][ T8720] team0: Port device team_slave_0 added [ 38.644487][ T8720] team0: Port device team_slave_1 added [ 38.658657][ T8720] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 38.684104][ T8720] 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. [ 38.724357][ T8720] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 38.755029][ T8720] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 38.762021][ T8720] 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. 02:42:23 executing program 2: r0 = syz_genetlink_get_family_id$nl80211(&(0x7f0000000080)='nl80211\x00') r1 = socket$nl_generic(0x10, 0x3, 0x10) sendmsg$NL80211_CMD_GET_STATION(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000140)={&(0x7f00000001c0)={0x1c, r0, 0xf2b, 0x0, 0x0, {0x67}, [@NL80211_ATTR_STA_PLINK_ACTION={0x5, 0x19, 0xfc}]}, 0x1c}}, 0x0) [ 38.796067][ T8720] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 38.811266][ T8874] IPVS: ftp: loaded support on port[0] = 21 [ 38.866455][ T8720] device hsr_slave_0 entered promiscuous mode [ 38.934598][ T8720] device hsr_slave_1 entered promiscuous mode [ 38.982005][ T8886] IPVS: ftp: loaded support on port[0] = 21 02:42:24 executing program 3: r0 = syz_open_dev$dri(&(0x7f0000000000)='/dev/dri/card#\x00', 0x0, 0x0) r1 = dup(r0) ioctl$ION_IOC_ALLOC(r1, 0xc0184900, &(0x7f0000000040)) [ 39.070595][ T8874] chnl_net:caif_netlink_parms(): no params data found [ 39.108427][ T8720] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 39.159049][ T8720] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 39.205812][ T8720] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 39.253938][ T8720] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 39.261510][ T9105] IPVS: ftp: loaded support on port[0] = 21 [ 39.302495][ T8886] chnl_net:caif_netlink_parms(): no params data found [ 39.318718][ T8874] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.326222][ T8874] bridge0: port 1(bridge_slave_0) entered disabled state [ 39.333669][ T8874] device bridge_slave_0 entered promiscuous mode [ 39.365531][ T8874] bridge0: port 2(bridge_slave_1) entered blocking state [ 39.372650][ T8874] bridge0: port 2(bridge_slave_1) entered disabled state [ 39.381357][ T8874] device bridge_slave_1 entered promiscuous mode [ 39.395647][ T8720] bridge0: port 2(bridge_slave_1) entered blocking state [ 39.402670][ T8720] bridge0: port 2(bridge_slave_1) entered forwarding state 02:42:24 executing program 4: r0 = syz_open_dev$vbi(&(0x7f0000001940)='/dev/vbi#\x00', 0x0, 0x2) ioctl$VIDIOC_G_INPUT(r0, 0x80045626, &(0x7f0000001980)) [ 39.409965][ T8720] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.417478][ T8720] bridge0: port 1(bridge_slave_0) entered forwarding state [ 39.460981][ T8874] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 39.476438][ T8886] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.485034][ T8886] bridge0: port 1(bridge_slave_0) entered disabled state [ 39.493561][ T8886] device bridge_slave_0 entered promiscuous mode [ 39.528367][ T8874] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 39.549361][ T8886] bridge0: port 2(bridge_slave_1) entered blocking state [ 39.556745][ T8886] bridge0: port 2(bridge_slave_1) entered disabled state [ 39.574479][ T8886] device bridge_slave_1 entered promiscuous mode [ 39.601728][ T9105] chnl_net:caif_netlink_parms(): no params data found [ 39.621674][ T3924] bridge0: port 1(bridge_slave_0) entered disabled state [ 39.634389][ T3924] bridge0: port 2(bridge_slave_1) entered disabled state [ 39.665482][ T8886] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 39.678902][ T8874] team0: Port device team_slave_0 added [ 39.698096][ T8874] team0: Port device team_slave_1 added 02:42:24 executing program 5: r0 = socket$inet6_sctp(0xa, 0x1, 0x84) setsockopt$inet_sctp6_SCTP_ENABLE_STREAM_RESET(r0, 0x84, 0x76, &(0x7f0000000180)={0x0, 0x7}, 0x8) setsockopt$inet_sctp_SCTP_SOCKOPT_BINDX_ADD(r0, 0x84, 0x64, &(0x7f0000000040)=[@in6={0xa, 0x4e23, 0x0, @loopback}], 0x1c) setsockopt$inet_sctp6_SCTP_RECONFIG_SUPPORTED(r0, 0x84, 0x75, &(0x7f0000000100)={0x0, 0x6}, 0x8) connect$inet6(r0, &(0x7f00008c0000)={0xa, 0x4e23, 0x0, @loopback}, 0x1c) setsockopt$inet_sctp6_SCTP_RESET_STREAMS(r0, 0x84, 0x77, &(0x7f0000000080)={0x0, 0x2, 0x1, [0x0]}, 0xa) [ 39.707631][ T8886] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 39.723895][ T8720] 8021q: adding VLAN 0 to HW filter on device bond0 [ 39.745107][ T9298] IPVS: ftp: loaded support on port[0] = 21 [ 39.763463][ T9105] bridge0: port 1(bridge_slave_0) entered blocking state [ 39.773046][ T9105] bridge0: port 1(bridge_slave_0) entered disabled state [ 39.780711][ T9105] device bridge_slave_0 entered promiscuous mode [ 39.787800][ T8874] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 39.795855][ T8874] 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. [ 39.822495][ T8874] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 39.834247][ T8886] team0: Port device team_slave_0 added [ 39.840077][ T8874] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 39.847030][ T8874] 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. [ 39.873114][ T8874] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 39.894822][ T9105] bridge0: port 2(bridge_slave_1) entered blocking state [ 39.901861][ T9105] bridge0: port 2(bridge_slave_1) entered disabled state [ 39.909756][ T9105] device bridge_slave_1 entered promiscuous mode [ 39.924089][ T8886] team0: Port device team_slave_1 added [ 39.930607][ T9105] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 39.995325][ T8874] device hsr_slave_0 entered promiscuous mode [ 40.053821][ T8874] device hsr_slave_1 entered promiscuous mode [ 40.113846][ T8874] debugfs: Directory 'hsr0' with parent 'hsr' already present! [ 40.121435][ T8874] Cannot create hsr debugfs directory [ 40.134009][ T9105] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 40.135796][ T9364] IPVS: ftp: loaded support on port[0] = 21 [ 40.157558][ T3976] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 40.165525][ T3976] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 40.177659][ T8720] 8021q: adding VLAN 0 to HW filter on device team0 [ 40.193936][ T9105] team0: Port device team_slave_0 added [ 40.201141][ T9105] team0: Port device team_slave_1 added [ 40.211834][ T8886] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 40.219397][ T8886] 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. [ 40.246023][ T8886] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 40.275364][ T9299] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready [ 40.284535][ T9299] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 40.292713][ T9299] bridge0: port 1(bridge_slave_0) entered blocking state [ 40.299736][ T9299] bridge0: port 1(bridge_slave_0) entered forwarding state [ 40.307638][ T9299] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready [ 40.316907][ T9299] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 40.325154][ T9299] bridge0: port 2(bridge_slave_1) entered blocking state [ 40.332187][ T9299] bridge0: port 2(bridge_slave_1) entered forwarding state [ 40.339953][ T8886] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 40.347381][ T8886] 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. [ 40.373903][ T8886] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 40.390901][ T9105] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 40.398008][ T9105] 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. [ 40.424190][ T9105] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 40.436054][ T9105] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 40.442982][ T9105] 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. [ 40.469110][ T9105] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 40.490617][ T21] ================================================================== [ 40.498696][ T21] BUG: KCSAN: data-race in copy_process / release_task [ 40.505508][ T21] [ 40.507808][ T21] write to 0xffffffff89280410 of 4 bytes by task 9478 on cpu 1: [ 40.515544][ T21] release_task+0x6c8/0xb90 [ 40.520153][ T21] do_exit+0x1140/0x16e0 [ 40.524366][ T21] call_usermodehelper_exec_async+0x2da/0x2e0 [ 40.530421][ T21] ret_from_fork+0x1f/0x30 [ 40.534863][ T21] [ 40.537169][ T21] read to 0xffffffff89280410 of 4 bytes by task 21 on cpu 0: [ 40.544505][ T21] copy_process+0xab5/0x32b0 [ 40.549098][ T21] _do_fork+0xf1/0x660 [ 40.553145][ T21] kernel_thread+0x85/0xb0 [ 40.557536][ T21] call_usermodehelper_exec_work+0x4f/0x1b0 [ 40.563401][ T21] process_one_work+0x3cb/0x990 [ 40.568220][ T21] worker_thread+0x665/0xbe0 [ 40.572781][ T21] kthread+0x210/0x220 [ 40.576824][ T21] ret_from_fork+0x1f/0x30 [ 40.581246][ T21] [ 40.583590][ T21] Reported by Kernel Concurrency Sanitizer on: [ 40.589715][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc2-syzkaller #0 [ 40.598016][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.608107][ T21] Workqueue: events_unbound call_usermodehelper_exec_work [ 40.615205][ T21] ================================================================== [ 40.623331][ T21] Kernel panic - not syncing: panic_on_warn set ... [ 40.629907][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.8.0-rc2-syzkaller #0 [ 40.638285][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 40.648364][ T21] Workqueue: events_unbound call_usermodehelper_exec_work [ 40.655440][ T21] Call Trace: [ 40.658704][ T21] dump_stack+0x10f/0x19d [ 40.663003][ T21] panic+0x1f8/0x63a [ 40.666867][ T21] ? vprintk_emit+0x44a/0x4f0 [ 40.671562][ T21] kcsan_report+0x684/0x690 [ 40.676038][ T21] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 40.681553][ T21] ? copy_process+0xab5/0x32b0 [ 40.686286][ T21] ? _do_fork+0xf1/0x660 [ 40.690553][ T21] ? kernel_thread+0x85/0xb0 [ 40.695132][ T21] ? call_usermodehelper_exec_work+0x4f/0x1b0 [ 40.701167][ T21] ? process_one_work+0x3cb/0x990 [ 40.706178][ T21] ? worker_thread+0x665/0xbe0 [ 40.710930][ T21] ? kthread+0x210/0x220 [ 40.715141][ T21] ? ret_from_fork+0x1f/0x30 [ 40.719708][ T21] ? debug_smp_processor_id+0x18/0x20 [ 40.725052][ T21] ? printk_nmi_enter+0x20/0x20 [ 40.729873][ T21] ? copy_creds+0x280/0x350 [ 40.734345][ T21] ? copy_creds+0x280/0x350 [ 40.738817][ T21] kcsan_setup_watchpoint+0x453/0x4d0 [ 40.744158][ T21] ? copy_creds+0x280/0x350 [ 40.748629][ T21] copy_process+0xab5/0x32b0 [ 40.753191][ T21] ? check_preempt_wakeup+0x1cb/0x370 [ 40.758532][ T21] ? proc_cap_handler+0x280/0x280 [ 40.763526][ T21] _do_fork+0xf1/0x660 [ 40.767563][ T21] ? enqueue_entity+0x25a/0x480 [ 40.772487][ T21] ? proc_cap_handler+0x280/0x280 [ 40.777481][ T21] kernel_thread+0x85/0xb0 [ 40.781869][ T21] ? proc_cap_handler+0x280/0x280 [ 40.786879][ T21] call_usermodehelper_exec_work+0x4f/0x1b0 [ 40.792751][ T21] process_one_work+0x3cb/0x990 [ 40.798179][ T21] worker_thread+0x665/0xbe0 [ 40.802740][ T21] ? process_one_work+0x990/0x990 [ 40.807735][ T21] kthread+0x210/0x220 [ 40.811891][ T21] ? process_one_work+0x990/0x990 [ 40.816900][ T21] ? constant_test_bit+0x30/0x30 [ 40.821826][ T21] ret_from_fork+0x1f/0x30 [ 40.827380][ T21] Kernel Offset: disabled [ 40.831715][ T21] Rebooting in 86400 seconds..