[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.25' (ECDSA) to the list of known hosts. syzkaller login: [ 66.725299][ T6539] chnl_net:caif_netlink_parms(): no params data found [ 66.797179][ T6539] bridge0: port 1(bridge_slave_0) entered blocking state [ 66.806106][ T6539] bridge0: port 1(bridge_slave_0) entered disabled state [ 66.815187][ T6539] device bridge_slave_0 entered promiscuous mode [ 66.824656][ T6539] bridge0: port 2(bridge_slave_1) entered blocking state [ 66.832284][ T6539] bridge0: port 2(bridge_slave_1) entered disabled state [ 66.839960][ T6539] device bridge_slave_1 entered promiscuous mode [ 66.869909][ T6539] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 66.880754][ T6539] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 66.914581][ T6539] team0: Port device team_slave_0 added [ 66.922540][ T6539] team0: Port device team_slave_1 added [ 66.950322][ T6539] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 66.957384][ T6539] 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. [ 66.984211][ T6539] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 66.997739][ T6539] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 67.005651][ T6539] 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. [ 67.031649][ T6539] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 67.068678][ T6539] device hsr_slave_0 entered promiscuous mode [ 67.075709][ T6539] device hsr_slave_1 entered promiscuous mode [ 67.211017][ T6539] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 67.227192][ T6539] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 67.236022][ T6539] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 67.246908][ T6539] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 67.269992][ T6539] bridge0: port 2(bridge_slave_1) entered blocking state [ 67.277295][ T6539] bridge0: port 2(bridge_slave_1) entered forwarding state [ 67.285150][ T6539] bridge0: port 1(bridge_slave_0) entered blocking state [ 67.292310][ T6539] bridge0: port 1(bridge_slave_0) entered forwarding state [ 67.337233][ T6539] 8021q: adding VLAN 0 to HW filter on device bond0 [ 67.353683][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 67.366221][ T20] bridge0: port 1(bridge_slave_0) entered disabled state [ 67.374623][ T20] bridge0: port 2(bridge_slave_1) entered disabled state [ 67.384127][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 67.396866][ T6539] 8021q: adding VLAN 0 to HW filter on device team0 [ 67.408102][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 67.417268][ T7] bridge0: port 1(bridge_slave_0) entered blocking state [ 67.424388][ T7] bridge0: port 1(bridge_slave_0) entered forwarding state [ 67.443003][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 67.452103][ T7] bridge0: port 2(bridge_slave_1) entered blocking state [ 67.459174][ T7] bridge0: port 2(bridge_slave_1) entered forwarding state [ 67.480610][ T6539] hsr0: Slave A (hsr_slave_0) is not up; please bring it up to get a fully working HSR network [ 67.491603][ T6539] hsr0: Slave B (hsr_slave_1) is not up; please bring it up to get a fully working HSR network [ 67.504948][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 67.514068][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 67.522820][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 67.532079][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 67.540329][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 67.548553][ T20] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 67.570769][ T6539] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 67.578155][ T6859] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 67.585723][ T6859] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 67.605781][ T1056] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 67.624242][ T6859] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 67.634060][ T6859] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 67.641878][ T6859] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 67.652651][ T6539] device veth0_vlan entered promiscuous mode [ 67.665293][ T6539] device veth1_vlan entered promiscuous mode [ 67.687570][ T1056] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 67.696316][ T1056] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 67.705734][ T1056] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 67.717866][ T6539] device veth0_macvtap entered promiscuous mode [ 67.728121][ T1056] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 67.740122][ T6539] device veth1_macvtap entered promiscuous mode [ 67.759256][ T6539] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 67.767128][ T6859] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_0: link becomes ready [ 67.777888][ T6859] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 67.789718][ T6539] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 67.797106][ T1056] IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready [ 67.806151][ T1056] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 67.817802][ T6539] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 67.827147][ T6539] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 [ 67.842620][ T6539] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 67.851547][ T6539] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 [ 67.953745][ T1162] wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 67.975756][ T1162] wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 executing program [ 67.999631][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 68.023292][ T1162] wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 [ 68.032723][ T1162] wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 [ 68.046603][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready [ 68.060897][ T6539] [ 68.063233][ T6539] ============================================ [ 68.069374][ T6539] WARNING: possible recursive locking detected [ 68.075511][ T6539] 5.15.0-rc6-syzkaller #0 Not tainted [ 68.080971][ T6539] -------------------------------------------- [ 68.087095][ T6539] syz-executor023/6539 is trying to acquire lock: [ 68.093481][ T6539] ffff88801c693398 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x30f/0xbc0 [ 68.102525][ T6539] [ 68.102525][ T6539] but task is already holding lock: [ 68.109879][ T6539] ffff88801d04fc98 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x30f/0xbc0 [ 68.118909][ T6539] [ 68.118909][ T6539] other info that might help us debug this: [ 68.126944][ T6539] Possible unsafe locking scenario: [ 68.126944][ T6539] [ 68.134381][ T6539] CPU0 [ 68.137639][ T6539] ---- [ 68.140913][ T6539] lock(_xmit_ETHER#2); [ 68.145138][ T6539] lock(_xmit_ETHER#2); [ 68.149360][ T6539] [ 68.149360][ T6539] *** DEADLOCK *** [ 68.149360][ T6539] [ 68.157476][ T6539] May be due to missing lock nesting notation [ 68.157476][ T6539] [ 68.165771][ T6539] 7 locks held by syz-executor023/6539: [ 68.171307][ T6539] #0: ffffffff8b981ac0 (rcu_read_lock_bh){....}-{1:2}, at: ip_finish_output2+0x28b/0x2140 [ 68.181291][ T6539] #1: ffffffff8b981ac0 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x1d5/0x36e0 [ 68.191201][ T6539] #2: ffff88801a4f5258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_queue_xmit+0x1222/0x36e0 [ 68.203607][ T6539] #3: ffff88801d04fc98 (_xmit_ETHER#2){+.-.}-{2:2}, at: sch_direct_xmit+0x30f/0xbc0 [ 68.213082][ T6539] #4: ffffffff8b981ac0 (rcu_read_lock_bh){....}-{1:2}, at: ip_finish_output2+0x28b/0x2140 [ 68.223056][ T6539] #5: ffffffff8b981ac0 (rcu_read_lock_bh){....}-{1:2}, at: __dev_queue_xmit+0x1d5/0x36e0 [ 68.232948][ T6539] #6: ffff88807762e258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{2:2}, at: __dev_queue_xmit+0x1222/0x36e0 [ 68.245359][ T6539] [ 68.245359][ T6539] stack backtrace: [ 68.251219][ T6539] CPU: 0 PID: 6539 Comm: syz-executor023 Not tainted 5.15.0-rc6-syzkaller #0 [ 68.259957][ T6539] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.269992][ T6539] Call Trace: [ 68.273254][ T6539] dump_stack_lvl+0xcd/0x134 [ 68.277828][ T6539] __lock_acquire.cold+0x149/0x3ab [ 68.282933][ T6539] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 68.288901][ T6539] ? __skb_checksum+0x890/0x890 [ 68.293736][ T6539] ? sendmsg_unlocked+0x90/0x90 [ 68.298572][ T6539] ? reqsk_fastopen_remove+0x620/0x620 [ 68.304022][ T6539] lock_acquire+0x1ab/0x510 [ 68.308505][ T6539] ? sch_direct_xmit+0x30f/0xbc0 [ 68.313425][ T6539] ? lock_release+0x720/0x720 [ 68.318080][ T6539] ? validate_xmit_skb+0x868/0xee0 [ 68.323179][ T6539] _raw_spin_lock+0x2a/0x40 [ 68.327673][ T6539] ? sch_direct_xmit+0x30f/0xbc0 [ 68.332596][ T6539] sch_direct_xmit+0x30f/0xbc0 [ 68.337344][ T6539] ? dev_watchdog+0xd50/0xd50 [ 68.342010][ T6539] ? do_raw_spin_trylock+0xb0/0x180 [ 68.347199][ T6539] ? do_raw_spin_lock+0x210/0x2b0 [ 68.352205][ T6539] __dev_queue_xmit+0x1489/0x36e0 [ 68.357217][ T6539] ? netdev_core_pick_tx+0x2e0/0x2e0 [ 68.362489][ T6539] ? ip_finish_output2+0x813/0x2140 [ 68.367670][ T6539] ? mark_held_locks+0x9f/0xe0 [ 68.372414][ T6539] ? memcpy+0x39/0x60 [ 68.376378][ T6539] neigh_resolve_output+0x50e/0x820 [ 68.381558][ T6539] ip_finish_output2+0x813/0x2140 [ 68.386563][ T6539] ? nf_hook+0x20d/0x5b0 [ 68.390786][ T6539] ? ip_fragment.constprop.0+0x240/0x240 [ 68.396399][ T6539] ? ip_frag_next+0x9a0/0x9a0 [ 68.401056][ T6539] __ip_finish_output+0x396/0x640 [ 68.406094][ T6539] ip_finish_output+0x32/0x200 [ 68.410838][ T6539] ip_output+0x196/0x310 [ 68.415062][ T6539] ip_local_out+0xaf/0x1a0 [ 68.419461][ T6539] iptunnel_xmit+0x628/0xa50 [ 68.424033][ T6539] ip_tunnel_xmit+0x10a6/0x2b60 [ 68.428873][ T6539] ? ip_md_tunnel_xmit+0x1520/0x1520 [ 68.434140][ T6539] ? skb_network_protocol+0x148/0x580 [ 68.439502][ T6539] ? __sanitizer_cov_trace_const_cmp2+0x22/0x80 [ 68.445736][ T6539] ? __gre_xmit+0x535/0x970 [ 68.450220][ T6539] erspan_xmit+0x7e2/0x29c0 [ 68.454705][ T6539] dev_hard_start_xmit+0x1eb/0x920 [ 68.459810][ T6539] sch_direct_xmit+0x19f/0xbc0 [ 68.464559][ T6539] ? lock_release+0x720/0x720 [ 68.469218][ T6539] ? __lock_acquire+0x162f/0x54a0 [ 68.474324][ T6539] ? dev_watchdog+0xd50/0xd50 [ 68.479079][ T6539] ? do_raw_spin_trylock+0xb0/0x180 [ 68.484273][ T6539] ? do_raw_spin_lock+0x210/0x2b0 [ 68.489278][ T6539] __dev_queue_xmit+0x1489/0x36e0 [ 68.494285][ T6539] ? netdev_core_pick_tx+0x2e0/0x2e0 [ 68.499549][ T6539] ? ip_finish_output2+0x813/0x2140 [ 68.504729][ T6539] ? lock_downgrade+0x6e0/0x6e0 [ 68.509573][ T6539] ? do_raw_write_lock+0x11a/0x280 [ 68.514669][ T6539] ? memcpy+0x39/0x60 [ 68.518634][ T6539] neigh_resolve_output+0x50e/0x820 [ 68.523814][ T6539] ip_finish_output2+0x813/0x2140 [ 68.528819][ T6539] ? nf_hook+0x20d/0x5b0 [ 68.533064][ T6539] ? ip_fragment.constprop.0+0x240/0x240 [ 68.538673][ T6539] ? ip_frag_next+0x9a0/0x9a0 [ 68.543333][ T6539] __ip_finish_output+0x396/0x640 [ 68.548356][ T6539] ip_finish_output+0x32/0x200 [ 68.553114][ T6539] ip_output+0x196/0x310 [ 68.557336][ T6539] ip_send_skb+0xd4/0x260 [ 68.561648][ T6539] udp_send_skb+0x6cd/0x11a0 [ 68.566220][ T6539] udp_sendmsg+0x1bad/0x2740 [ 68.570792][ T6539] ? ip_frag_init+0x330/0x330 [ 68.575452][ T6539] ? udp_unicast_rcv_skb+0x330/0x330 [ 68.580726][ T6539] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 68.586747][ T6539] ? arch_stack_walk+0x93/0xe0 [ 68.591507][ T6539] ? mark_lock+0xef/0x17b0 [ 68.595935][ T6539] ? lock_chain_count+0x20/0x20 [ 68.600778][ T6539] ? find_held_lock+0x2d/0x110 [ 68.605531][ T6539] udpv6_sendmsg+0x14f6/0x2c40 [ 68.610381][ T6539] ? mark_held_locks+0x9f/0xe0 [ 68.615311][ T6539] ? udp_v6_push_pending_frames+0x380/0x380 [ 68.621275][ T6539] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 68.627241][ T6539] ? find_held_lock+0x2d/0x110 [ 68.631995][ T6539] ? aa_sk_perm+0x311/0xab0 [ 68.636569][ T6539] ? aa_af_perm+0x230/0x230 [ 68.641051][ T6539] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 68.647296][ T6539] ? inet6_sendmsg+0x4a/0xe0 [ 68.651887][ T6539] inet6_sendmsg+0x99/0xe0 [ 68.656287][ T6539] ? inet6_compat_ioctl+0x310/0x310 [ 68.661467][ T6539] sock_sendmsg+0xcf/0x120 [ 68.665887][ T6539] ____sys_sendmsg+0x331/0x810 [ 68.670640][ T6539] ? kernel_sendmsg+0x50/0x50 [ 68.675301][ T6539] ? do_recvmmsg+0x6d0/0x6d0 [ 68.679878][ T6539] ? mark_lock+0xef/0x17b0 [ 68.684284][ T6539] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 68.690267][ T6539] ___sys_sendmsg+0xf3/0x170 [ 68.694854][ T6539] ? sendmsg_copy_msghdr+0x160/0x160 [ 68.700150][ T6539] ? mark_lock+0xef/0x17b0 [ 68.704568][ T6539] ? mark_lock+0xef/0x17b0 [ 68.708969][ T6539] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 68.714942][ T6539] ? lock_chain_count+0x20/0x20 [ 68.719777][ T6539] ? lock_chain_count+0x20/0x20 [ 68.724609][ T6539] ? release_sock+0x1b/0x1b0 [ 68.729181][ T6539] ? reacquire_held_locks+0x214/0x4e0 [ 68.734534][ T6539] ? release_sock+0x1b/0x1b0 [ 68.739105][ T6539] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 68.745763][ T6539] ? __fget_light+0x215/0x280 [ 68.750650][ T6539] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 68.756889][ T6539] __sys_sendmmsg+0x195/0x470 [ 68.761567][ T6539] ? __ia32_sys_sendmsg+0xb0/0xb0 [ 68.766580][ T6539] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 68.772551][ T6539] ? __local_bh_enable_ip+0xa0/0x120 [ 68.777840][ T6539] ? find_held_lock+0x2d/0x110 [ 68.782586][ T6539] ? __context_tracking_exit+0xb8/0xe0 [ 68.788035][ T6539] ? lock_downgrade+0x6e0/0x6e0 [ 68.792875][ T6539] ? lock_downgrade+0x6e0/0x6e0 [ 68.797712][ T6539] __x64_sys_sendmmsg+0x99/0x100 [ 68.802650][ T6539] ? syscall_enter_from_user_mode+0x21/0x70 [ 68.808528][ T6539] do_syscall_64+0x35/0xb0 [ 68.812934][ T6539] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 68.818817][ T6539] RIP: 0033:0x7f728d0d9aa9 [ 68.823226][ T6539] 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 [ 68.842813][ T6539] RSP: 002b:00007ffda2643b88 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 68.851208][ T6539] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f728d0d9aa9 [ 68.859162][ T6539] RDX: 0000000000000001 RSI: 0000000020004d8