[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.74' (ECDSA) to the list of known hosts. syzkaller login: [ 69.213283][ T6529] chnl_net:caif_netlink_parms(): no params data found [ 69.283235][ T6529] bridge0: port 1(bridge_slave_0) entered blocking state [ 69.290882][ T6529] bridge0: port 1(bridge_slave_0) entered disabled state [ 69.298688][ T6529] device bridge_slave_0 entered promiscuous mode [ 69.308276][ T6529] bridge0: port 2(bridge_slave_1) entered blocking state [ 69.316477][ T6529] bridge0: port 2(bridge_slave_1) entered disabled state [ 69.325039][ T6529] device bridge_slave_1 entered promiscuous mode [ 69.358432][ T6529] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 69.369358][ T6529] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 69.404708][ T6529] team0: Port device team_slave_0 added [ 69.412119][ T6529] team0: Port device team_slave_1 added [ 69.441362][ T6529] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 69.448313][ T6529] 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. [ 69.475803][ T6529] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 69.489215][ T6529] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 69.496315][ T6529] 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. [ 69.522424][ T6529] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 69.557722][ T6529] device hsr_slave_0 entered promiscuous mode [ 69.565285][ T6529] device hsr_slave_1 entered promiscuous mode [ 69.682483][ T6529] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 69.695621][ T6529] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 69.705301][ T6529] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 69.715767][ T6529] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 69.741935][ T6529] bridge0: port 2(bridge_slave_1) entered blocking state [ 69.749068][ T6529] bridge0: port 2(bridge_slave_1) entered forwarding state [ 69.756932][ T6529] bridge0: port 1(bridge_slave_0) entered blocking state [ 69.764064][ T6529] bridge0: port 1(bridge_slave_0) entered forwarding state [ 69.808154][ T6529] 8021q: adding VLAN 0 to HW filter on device bond0 [ 69.823258][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 69.834647][ T7] bridge0: port 1(bridge_slave_0) entered disabled state [ 69.843369][ T7] bridge0: port 2(bridge_slave_1) entered disabled state [ 69.853032][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 69.866766][ T6529] 8021q: adding VLAN 0 to HW filter on device team0 [ 69.877291][ T136] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 69.886808][ T136] bridge0: port 1(bridge_slave_0) entered blocking state [ 69.894012][ T136] bridge0: port 1(bridge_slave_0) entered forwarding state [ 69.907415][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 69.915862][ T7] bridge0: port 2(bridge_slave_1) entered blocking state [ 69.922960][ T7] bridge0: port 2(bridge_slave_1) entered forwarding state [ 69.941275][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 69.956284][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 69.964357][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 69.979465][ T6529] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 69.993084][ T6529] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 70.005496][ T6848] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 70.014229][ T6848] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 70.023098][ T6848] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 70.046377][ T136] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 70.056136][ T136] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 70.068497][ T6529] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 70.089183][ T6848] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 70.108296][ T6848] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 70.117473][ T6848] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 70.126632][ T6848] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 70.137707][ T6529] device veth0_vlan entered promiscuous mode [ 70.149547][ T6529] device veth1_vlan entered promiscuous mode [ 70.170439][ T136] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 70.178688][ T136] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 70.187270][ T136] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 70.199211][ T6529] device veth0_macvtap entered promiscuous mode [ 70.211078][ T6529] device veth1_macvtap entered promiscuous mode [ 70.227752][ T6529] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 70.235678][ T6848] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 70.245012][ T6848] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 70.257079][ T6529] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 70.264832][ T6848] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 70.273591][ T6848] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 70.285120][ T6529] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 70.293984][ T6529] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 70.305298][ T6529] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 70.314068][ T6529] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 70.416509][ T54] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 70.441088][ T54] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 70.463621][ T136] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 70.480243][ T8] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 70.501127][ T8] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 executing program [ 70.518795][ T136] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 70.544559][ T6529] [ 70.546887][ T6529] ============================================ [ 70.553007][ T6529] WARNING: possible recursive locking detected [ 70.559131][ T6529] 5.16.0-rc4-syzkaller #0 Not tainted [ 70.564472][ T6529] -------------------------------------------- [ 70.570593][ T6529] syz-executor793/6529 is trying to acquire lock: [ 70.576998][ T6529] ffff88807cbe7398 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x318/0xbe0 [ 70.586042][ T6529] [ 70.586042][ T6529] but task is already holding lock: [ 70.593382][ T6529] ffff88802280f098 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x318/0xbe0 [ 70.602410][ T6529] [ 70.602410][ T6529] other info that might help us debug this: [ 70.610457][ T6529] Possible unsafe locking scenario: [ 70.610457][ T6529] [ 70.618235][ T6529] CPU0 [ 70.621492][ T6529] ---- [ 70.624780][ T6529] lock(_xmit_ETHER#2); [ 70.629037][ T6529] lock(_xmit_ETHER#2); [ 70.633258][ T6529] [ 70.633258][ T6529] *** DEADLOCK *** [ 70.633258][ T6529] [ 70.641378][ T6529] May be due to missing lock nesting notation [ 70.641378][ T6529] [ 70.649670][ T6529] 7 locks held by syz-executor793/6529: [ 70.655188][ T6529] #0: ffffffff8bb83cc0 (rcu_read_lock_bh){....}-{1:2}, at: ip_finish_output2+0x28c/0x2160 [ 70.665186][ T6529] #1: ffffffff8bb83cc0 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x1e3/0x3650 [ 70.675081][ T6529] #2: ffff888075eec258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_queue_xmit+0x126f/0x3650 [ 70.687491][ T6529] #3: ffff88802280f098 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x318/0xbe0 [ 70.696963][ T6529] #4: ffffffff8bb83cc0 (rcu_read_lock_bh){....}-{1:2}, at: ip_finish_output2+0x28c/0x2160 [ 70.706956][ T6529] #5: ffffffff8bb83cc0 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x1e3/0x3650 [ 70.716933][ T6529] #6: ffff8880194e1258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_queue_xmit+0x126f/0x3650 [ 70.729429][ T6529] [ 70.729429][ T6529] stack backtrace: [ 70.735301][ T6529] CPU: 1 PID: 6529 Comm: syz-executor793 Not tainted 5.16.0-rc4-syzkaller #0 [ 70.744039][ T6529] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.754073][ T6529] Call Trace: [ 70.757333][ T6529] [ 70.760245][ T6529] dump_stack_lvl+0xcd/0x134 [ 70.764820][ T6529] __lock_acquire.cold+0x149/0x3ab [ 70.769915][ T6529] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 70.775887][ T6529] ? __skb_checksum+0x890/0x890 [ 70.780728][ T6529] ? sendmsg_unlocked+0x90/0x90 [ 70.785565][ T6529] ? reqsk_fastopen_remove+0x620/0x620 [ 70.791021][ T6529] lock_acquire+0x1ab/0x510 [ 70.795505][ T6529] ? sch_direct_xmit+0x318/0xbe0 [ 70.800420][ T6529] ? lock_release+0x720/0x720 [ 70.805074][ T6529] ? validate_xmit_skb+0x868/0xee0 [ 70.810170][ T6529] _raw_spin_lock+0x2a/0x40 [ 70.814658][ T6529] ? sch_direct_xmit+0x318/0xbe0 [ 70.819585][ T6529] sch_direct_xmit+0x318/0xbe0 [ 70.824336][ T6529] ? dev_watchdog+0xd60/0xd60 [ 70.828993][ T6529] ? do_raw_spin_trylock+0xb0/0x180 [ 70.834178][ T6529] ? do_raw_spin_lock+0x270/0x2b0 [ 70.839188][ T6529] __dev_queue_xmit+0x149c/0x3650 [ 70.844200][ T6529] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 70.850165][ T6529] ? lock_chain_count+0x20/0x20 [ 70.855008][ T6529] ? netdev_core_pick_tx+0x2e0/0x2e0 [ 70.860275][ T6529] ? find_held_lock+0x2d/0x110 [ 70.865021][ T6529] ? ip_finish_output2+0x77f/0x2160 [ 70.870204][ T6529] ? mark_held_locks+0x9f/0xe0 [ 70.874947][ T6529] ? memcpy+0x39/0x60 [ 70.879089][ T6529] neigh_resolve_output+0x50e/0x820 [ 70.884280][ T6529] ip_finish_output2+0x77f/0x2160 [ 70.889291][ T6529] ? nf_hook+0x20d/0x5b0 [ 70.893552][ T6529] ? ip_fragment.constprop.0+0x240/0x240 [ 70.899167][ T6529] ? ip_frag_next+0x9a0/0x9a0 [ 70.903853][ T6529] __ip_finish_output+0x396/0x640 [ 70.908867][ T6529] ip_finish_output+0x32/0x200 [ 70.913618][ T6529] ip_output+0x196/0x310 [ 70.917928][ T6529] ip_local_out+0xaf/0x1a0 [ 70.922422][ T6529] iptunnel_xmit+0x628/0xa50 [ 70.926996][ T6529] ip_tunnel_xmit+0x10a6/0x2b60 [ 70.931832][ T6529] ? ip_md_tunnel_xmit+0x1520/0x1520 [ 70.937097][ T6529] ? skb_network_protocol+0x148/0x580 [ 70.942452][ T6529] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 70.948675][ T6529] ? __gre_xmit+0x535/0x970 [ 70.953161][ T6529] erspan_xmit+0x7e2/0x29c0 [ 70.957645][ T6529] dev_hard_start_xmit+0x1eb/0x920 [ 70.962748][ T6529] sch_direct_xmit+0x19f/0xbe0 [ 70.967487][ T6529] ? lock_release+0x720/0x720 [ 70.972144][ T6529] ? __lock_acquire+0x162f/0x54a0 [ 70.977148][ T6529] ? dev_watchdog+0xd60/0xd60 [ 70.981801][ T6529] ? do_raw_spin_trylock+0xb0/0x180 [ 70.986987][ T6529] ? do_raw_spin_lock+0x270/0x2b0 [ 70.991995][ T6529] __dev_queue_xmit+0x149c/0x3650 [ 70.997006][ T6529] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 71.002970][ T6529] ? netdev_core_pick_tx+0x2e0/0x2e0 [ 71.008235][ T6529] ? find_held_lock+0x2d/0x110 [ 71.012980][ T6529] ? ip_finish_output2+0x77f/0x2160 [ 71.018160][ T6529] ? lock_downgrade+0x6e0/0x6e0 [ 71.022990][ T6529] ? do_raw_write_lock+0x11a/0x280 [ 71.028082][ T6529] ? memcpy+0x39/0x60 [ 71.032045][ T6529] neigh_resolve_output+0x50e/0x820 [ 71.037227][ T6529] ip_finish_output2+0x77f/0x2160 [ 71.042246][ T6529] ? nf_hook+0x20d/0x5b0 [ 71.046480][ T6529] ? ip_fragment.constprop.0+0x240/0x240 [ 71.052106][ T6529] ? ip_frag_next+0x9a0/0x9a0 [ 71.056773][ T6529] __ip_finish_output+0x396/0x640 [ 71.061823][ T6529] ip_finish_output+0x32/0x200 [ 71.066583][ T6529] ip_output+0x196/0x310 [ 71.070822][ T6529] ip_send_skb+0xd4/0x260 [ 71.075143][ T6529] udp_send_skb+0x6cd/0x11a0 [ 71.079737][ T6529] udp_sendmsg+0x1bad/0x2740 [ 71.084328][ T6529] ? ip_frag_init+0x330/0x330 [ 71.088996][ T6529] ? mark_lock+0xef/0x17b0 [ 71.093412][ T6529] ? udp_unicast_rcv_skb+0x330/0x330 [ 71.098709][ T6529] ? arch_stack_walk+0x93/0xe0 [ 71.103477][ T6529] ? lock_chain_count+0x20/0x20 [ 71.108312][ T6529] ? find_held_lock+0x2d/0x110 [ 71.113060][ T6529] ? __stack_depot_save+0x246/0x4f0 [ 71.118240][ T6529] udpv6_sendmsg+0x14ea/0x2c40 [ 71.122992][ T6529] ? udp_v6_push_pending_frames+0x380/0x380 [ 71.128868][ T6529] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 71.134860][ T6529] ? find_held_lock+0x2d/0x110 [ 71.139660][ T6529] ? aa_sk_perm+0x30f/0xaa0 [ 71.144164][ T6529] ? aa_af_perm+0x230/0x230 [ 71.148657][ T6529] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 71.154892][ T6529] ? inet6_sendmsg+0x4a/0xe0 [ 71.159560][ T6529] inet6_sendmsg+0x99/0xe0 [ 71.163975][ T6529] ? inet6_compat_ioctl+0x310/0x310 [ 71.169156][ T6529] sock_sendmsg+0xcf/0x120 [ 71.173559][ T6529] ____sys_sendmsg+0x331/0x810 [ 71.178309][ T6529] ? kernel_sendmsg+0x50/0x50 [ 71.182988][ T6529] ? do_recvmmsg+0x6d0/0x6d0 [ 71.187556][ T6529] ? mark_lock+0xef/0x17b0 [ 71.191954][ T6529] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 71.198088][ T6529] ___sys_sendmsg+0xf3/0x170 [ 71.202659][ T6529] ? sendmsg_copy_msghdr+0x160/0x160 [ 71.208014][ T6529] ? mark_lock+0xef/0x17b0 [ 71.212413][ T6529] ? mark_lock+0xef/0x17b0 [ 71.216815][ T6529] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 71.222783][ T6529] ? lock_chain_count+0x20/0x20 [ 71.227614][ T6529] ? lock_chain_count+0x20/0x20 [ 71.232450][ T6529] ? release_sock+0x1b/0x1b0 [ 71.237022][ T6529] ? reacquire_held_locks+0x214/0x4e0 [ 71.242372][ T6529] ? release_sock+0x1b/0x1b0 [ 71.246942][ T6529] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 71.253250][ T6529] ? __fget_light+0x215/0x280 [ 71.257924][ T6529] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 71.264148][ T6529] __sys_sendmmsg+0x195/0x470 [ 71.268807][ T6529] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 71.273807][ T6529] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 71.279766][ T6529] ? __local_bh_enable_ip+0xa0/0x120 [ 71.285036][ T6529] ? find_held_lock+0x2d/0x110 [ 71.289871][ T6529] ? __context_tracking_exit+0xb8/0xe0 [ 71.295311][ T6529] ? lock_downgrade+0x6e0/0x6e0 [ 71.300158][ T6529] ? lock_downgrade+0x6e0/0x6e0 [ 71.304990][ T6529] __x64_sys_sendmmsg+0x99/0x100 [ 71.309916][ T6529] ? syscall_enter_from_user_mode+0x21/0x70 [ 71.315790][ T6529] do_syscall_64+0x35/0xb0 [ 71.320192][ T6529] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 71.326416][ T6529] RIP: 0033:0x7f30d8284b39 [ 71.330811][ T6529] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 41 15 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48 [ 71.350412][ T6529] RSP: 002b:00007ffd9a7ac7c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 71.358803][ T6529] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f30d8284b39 [ 71.366754][ T6529] RDX: 0000000000000001 RSI: 0000000020004d80 R