[ OK ] Started Getty on tty2. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty1. [ OK ] Started OpenBSD Secure Shell server. [ OK ] Started getty on tty2-tty6 if dbus and logind are not available. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.8' (ECDSA) to the list of known hosts. 2021/04/02 05:50:57 parsed 1 programs 2021/04/02 05:50:58 executed programs: 0 syzkaller login: [ 70.858915][ T8411] IPVS: ftp: loaded support on port[0] = 21 [ 71.062632][ T8411] chnl_net:caif_netlink_parms(): no params data found [ 71.120287][ T8411] bridge0: port 1(bridge_slave_0) entered blocking state [ 71.129064][ T8411] bridge0: port 1(bridge_slave_0) entered disabled state [ 71.139349][ T3231] ieee802154 phy0 wpan0: encryption failed: -22 [ 71.145960][ T3231] ieee802154 phy1 wpan1: encryption failed: -22 [ 71.148160][ T8411] device bridge_slave_0 entered promiscuous mode [ 71.162570][ T8411] bridge0: port 2(bridge_slave_1) entered blocking state [ 71.171291][ T8411] bridge0: port 2(bridge_slave_1) entered disabled state [ 71.180246][ T8411] device bridge_slave_1 entered promiscuous mode [ 71.209926][ T8411] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 71.221887][ T8411] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 71.253420][ T8411] team0: Port device team_slave_0 added [ 71.262547][ T8411] team0: Port device team_slave_1 added [ 71.281589][ T8411] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 71.289377][ T8411] 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. [ 71.315655][ T8411] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 71.328733][ T8411] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 71.335969][ T8411] 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. [ 71.362072][ T8411] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 71.389234][ T8411] device hsr_slave_0 entered promiscuous mode [ 71.395996][ T8411] device hsr_slave_1 entered promiscuous mode [ 71.494927][ T8411] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 71.504948][ T8411] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 71.516028][ T8411] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 71.526096][ T8411] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 71.549923][ T8411] bridge0: port 2(bridge_slave_1) entered blocking state [ 71.557126][ T8411] bridge0: port 2(bridge_slave_1) entered forwarding state [ 71.564732][ T8411] bridge0: port 1(bridge_slave_0) entered blocking state [ 71.571901][ T8411] bridge0: port 1(bridge_slave_0) entered forwarding state [ 71.614635][ T8411] 8021q: adding VLAN 0 to HW filter on device bond0 [ 71.630222][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 71.642637][ T20] bridge0: port 1(bridge_slave_0) entered disabled state [ 71.652173][ T20] bridge0: port 2(bridge_slave_1) entered disabled state [ 71.660725][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 71.674798][ T8411] 8021q: adding VLAN 0 to HW filter on device team0 [ 71.688379][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 71.696962][ T5] bridge0: port 1(bridge_slave_0) entered blocking state [ 71.704003][ T5] bridge0: port 1(bridge_slave_0) entered forwarding state [ 71.728896][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 71.738991][ T5] bridge0: port 2(bridge_slave_1) entered blocking state [ 71.746111][ T5] bridge0: port 2(bridge_slave_1) entered forwarding state [ 71.754025][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 71.762893][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 71.773868][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 71.785685][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 71.798782][ T8411] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 71.811015][ T8411] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 71.820207][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 71.843299][ T8411] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 71.851226][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 71.860303][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 71.879601][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 71.899264][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 71.908021][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 71.916085][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 71.927920][ T8411] device veth0_vlan entered promiscuous mode [ 71.942278][ T8411] device veth1_vlan entered promiscuous mode [ 71.964227][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 71.973367][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 71.982223][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 71.994057][ T8411] device veth0_macvtap entered promiscuous mode [ 72.004158][ T8411] device veth1_macvtap entered promiscuous mode [ 72.023009][ T8411] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 72.031365][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 72.041061][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 72.055931][ T8411] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 72.063252][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 72.076528][ T5] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 72.089223][ T8411] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 72.098954][ T8411] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 72.108331][ T8411] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 72.117242][ T8411] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 72.219066][ T179] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 72.228151][ T179] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 72.253516][ T4803] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 72.272540][ T9] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 72.283521][ T9] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 72.293869][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 72.339883][ C0] hrtimer: interrupt took 35871 ns [ 72.561688][ T8654] [ 72.564553][ T8654] ============================= [ 72.569622][ T8654] WARNING: suspicious RCU usage [ 72.574948][ T8654] 5.12.0-rc4-syzkaller #0 Not tainted [ 72.580827][ T8654] ----------------------------- [ 72.586150][ T8654] include/linux/skmsg.h:286 suspicious rcu_dereference_check() usage! [ 72.594596][ T8654] [ 72.594596][ T8654] other info that might help us debug this: [ 72.594596][ T8654] [ 72.605041][ T8654] [ 72.605041][ T8654] rcu_scheduler_active = 2, debug_locks = 1 [ 72.613326][ T8654] 1 lock held by syz-executor.0/8654: [ 72.619002][ T8654] #0: ffff888022a78f88 (clock-AF_INET){++..}-{2:2}, at: sk_psock_drop+0x2c/0x460 [ 72.628503][ T8654] [ 72.628503][ T8654] stack backtrace: [ 72.634518][ T8654] CPU: 0 PID: 8654 Comm: syz-executor.0 Not tainted 5.12.0-rc4-syzkaller #0 [ 72.643336][ T8654] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.653516][ T8654] Call Trace: [ 72.656811][ T8654] dump_stack+0x141/0x1d7 [ 72.661189][ T8654] tcp_bpf_update_proto+0x530/0x5f0 [ 72.666417][ T8654] ? tcp_bpf_stream_read+0x270/0x270 [ 72.671723][ T8654] sk_psock_drop+0xdf/0x460 [ 72.676255][ T8654] tcp_bpf_recvmsg+0x32f/0x480 [ 72.681085][ T8654] ? tcp_bpf_sendpage+0x8d0/0x8d0 [ 72.686137][ T8654] ? tcp_bpf_recvmsg+0x20/0x480 [ 72.691018][ T8654] inet_recvmsg+0x11b/0x5d0 [ 72.695545][ T8654] ? irqentry_enter+0x2b/0x50 [ 72.700250][ T8654] ? inet_sendpage+0x140/0x140 [ 72.705052][ T8654] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 72.711345][ T8654] ? security_socket_recvmsg+0x8f/0xc0 [ 72.716829][ T8654] ? inet_sendpage+0x140/0x140 [ 72.721622][ T8654] ____sys_recvmsg+0x2c4/0x600 [ 72.726428][ T8654] ? move_addr_to_kernel.part.0+0x110/0x110 [ 72.732350][ T8654] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 72.739571][ T8654] ? __import_iovec+0x293/0x500 [ 72.744443][ T8654] ? lockdep_hardirqs_on+0x79/0x100 [ 72.749711][ T8654] ? import_iovec+0x10c/0x150 [ 72.754418][ T8654] ___sys_recvmsg+0x127/0x200 [ 72.759121][ T8654] ? __copy_msghdr_from_user+0x4b0/0x4b0 [ 72.764783][ T8654] ? __fget_files+0x266/0x3d0 [ 72.769485][ T8654] ? lock_downgrade+0x6e0/0x6e0 [ 72.774375][ T8654] ? __fget_files+0x288/0x3d0 [ 72.779085][ T8654] ? __fget_light+0xea/0x280 [ 72.783713][ T8654] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 72.790010][ T8654] __sys_recvmsg+0xe2/0x1a0 [ 72.794561][ T8654] ? __sys_recvmsg_sock+0x40/0x40 [ 72.799651][ T8654] ? syscall_enter_from_user_mode+0x31/0x70 [ 72.805601][ T8654] do_syscall_64+0x2d/0x70 [ 72.810039][ T8654] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 72.815962][ T8654] RIP: 0033:0x466459 [ 72.819878][ T8654] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 [ 72.839532][ T8654] RSP: 002b:00007fcbcd60e188 EFLAGS: 00000246 ORIG_RAX: 000000000000002f [ 72.847970][ T8654] RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 [ 72.855991][ T8654] RDX: 0000000000000000 RSI: 0000000020005400 RDI: 0000000000000005 [ 72.863977][ T8654] RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 [ 72.872025][ T8654] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 [ 72.880038][ T8654] R13: 00007ffedef17a5f R14: 00007fcbcd60e300 R15: 0000000000022000 [ 72.951753][ T5] Bluetooth: hci0: command 0x0409 tx timeout