Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.36' (ECDSA) to the list of known hosts. syzkaller login: [ 72.586349][ T8458] chnl_net:caif_netlink_parms(): no params data found [ 72.635625][ T8458] bridge0: port 1(bridge_slave_0) entered blocking state [ 72.643733][ T8458] bridge0: port 1(bridge_slave_0) entered disabled state [ 72.652501][ T8458] device bridge_slave_0 entered promiscuous mode [ 72.661696][ T8458] bridge0: port 2(bridge_slave_1) entered blocking state [ 72.670017][ T8458] bridge0: port 2(bridge_slave_1) entered disabled state [ 72.677916][ T8458] device bridge_slave_1 entered promiscuous mode [ 72.698629][ T8458] bond0: (slave bond_slave_0): Enslaving as an active interface with an up link [ 72.709345][ T8458] bond0: (slave bond_slave_1): Enslaving as an active interface with an up link [ 72.733053][ T8458] team0: Port device team_slave_0 added [ 72.741425][ T8458] team0: Port device team_slave_1 added [ 72.758918][ T8458] batman_adv: batadv0: Adding interface: batadv_slave_0 [ 72.765872][ T8458] 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. [ 72.792381][ T8458] batman_adv: batadv0: Not using interface batadv_slave_0 (retrying later): interface not active [ 72.805930][ T8458] batman_adv: batadv0: Adding interface: batadv_slave_1 [ 72.813477][ T8458] 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. [ 72.840914][ T8458] batman_adv: batadv0: Not using interface batadv_slave_1 (retrying later): interface not active [ 72.868344][ T8458] device hsr_slave_0 entered promiscuous mode [ 72.874926][ T8458] device hsr_slave_1 entered promiscuous mode [ 72.976991][ T8458] netdevsim netdevsim0 netdevsim0: renamed from eth0 [ 72.988690][ T8458] netdevsim netdevsim0 netdevsim1: renamed from eth1 [ 72.998757][ T8458] netdevsim netdevsim0 netdevsim2: renamed from eth2 [ 73.009337][ T8458] netdevsim netdevsim0 netdevsim3: renamed from eth3 [ 73.033918][ T8458] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.041223][ T8458] bridge0: port 2(bridge_slave_1) entered forwarding state [ 73.049166][ T8458] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.056267][ T8458] bridge0: port 1(bridge_slave_0) entered forwarding state [ 73.097577][ T8458] 8021q: adding VLAN 0 to HW filter on device bond0 [ 73.112420][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready [ 73.123777][ T7] bridge0: port 1(bridge_slave_0) entered disabled state [ 73.133810][ T7] bridge0: port 2(bridge_slave_1) entered disabled state [ 73.142940][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready [ 73.157714][ T8458] 8021q: adding VLAN 0 to HW filter on device team0 [ 73.168992][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_0: link becomes ready [ 73.177560][ T7] bridge0: port 1(bridge_slave_0) entered blocking state [ 73.184615][ T7] bridge0: port 1(bridge_slave_0) entered forwarding state [ 73.208554][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): bridge_slave_1: link becomes ready [ 73.217340][ T7] bridge0: port 2(bridge_slave_1) entered blocking state [ 73.224397][ T7] bridge0: port 2(bridge_slave_1) entered forwarding state [ 73.233393][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_0: link becomes ready [ 73.242482][ T7] IPv6: ADDRCONF(NETDEV_CHANGE): team_slave_1: link becomes ready [ 73.252227][ T8664] IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready [ 73.263868][ T3085] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_0: link becomes ready [ 73.277234][ T3085] IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready [ 73.289825][ T8458] IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready [ 73.308193][ T3085] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready [ 73.315568][ T3085] IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready [ 73.330181][ T8458] 8021q: adding VLAN 0 to HW filter on device batadv0 [ 73.348818][ T3085] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_virt_wifi: link becomes ready [ 73.368683][ T30] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_vlan: link becomes ready [ 73.378779][ T30] IPv6: ADDRCONF(NETDEV_CHANGE): vlan0: link becomes ready [ 73.386953][ T30] IPv6: ADDRCONF(NETDEV_CHANGE): vlan1: link becomes ready [ 73.397578][ T8458] device veth0_vlan entered promiscuous mode [ 73.419940][ T8458] device veth1_vlan entered promiscuous mode [ 73.443393][ T30] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan0: link becomes ready [ 73.451574][ T30] IPv6: ADDRCONF(NETDEV_CHANGE): macvlan1: link becomes ready [ 73.460900][ T30] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_macvtap: link becomes ready [ 73.472506][ T8458] device veth0_macvtap entered promiscuous mode [ 73.482082][ T8458] device veth1_macvtap entered promiscuous mode [ 73.500496][ T8458] batman_adv: batadv0: Interface activated: batadv_slave_0 [ 73.508155][ T8664] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready [ 73.519045][ T8664] IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready [ 73.529902][ T8458] batman_adv: batadv0: Interface activated: batadv_slave_1 [ 73.539932][ T8664] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready [ 73.550783][ T8458] netdevsim netdevsim0 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0 [ 73.559952][ T8458] netdevsim netdevsim0 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0 executing program [ 73.568717][ T8458] netdevsim netdevsim0 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0 [ 73.577571][ T8458] netdevsim netdevsim0 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0 executing program executing program executing program executing program [ 73.620235][ T8669] nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. executing program executing program executing program executing program [ 73.722238][ T8677] divide error: 0000 [#1] PREEMPT SMP KASAN [ 73.728149][ T8677] CPU: 1 PID: 8677 Comm: syz-executor073 Not tainted 5.14.0-rc3-syzkaller #0 [ 73.736894][ T8677] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.747045][ T8677] RIP: 0010:tcp_reno_cong_avoid+0x288/0x310 [ 73.753136][ T8677] Code: ab 40 09 00 00 e8 48 2f d1 f9 45 85 e4 0f 85 aa fe ff ff 5b 5d 41 5c 41 5d 41 5e e9 f2 27 d1 f9 e8 ed 27 d1 f9 44 89 e0 31 d2 f5 41 01 c5 89 93 44 09 00 00 44 89 ab 40 09 00 00 e9 fb fe ff [ 73.772896][ T8677] RSP: 0018:ffffc90001c4f698 EFLAGS: 00010246 [ 73.779109][ T8677] RAX: 0000000000000011 RBX: ffff88801c320bc0 RCX: 0000000000000000 [ 73.787071][ T8677] RDX: 0000000000000000 RSI: ffffffff87a47373 RDI: 0000000000000003 [ 73.795033][ T8677] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 73.802994][ T8677] R10: ffffffff87a47275 R11: 0000000000000000 R12: 0000000000000011 [ 73.810954][ T8677] R13: 0000000000000001 R14: 00000000ffffffff R15: ffff88801c321500 [ 73.818909][ T8677] FS: 0000000001060300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 73.827849][ T8677] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 73.834423][ T8677] CR2: 0000000020200000 CR3: 0000000033f16000 CR4: 00000000001506e0 [ 73.842432][ T8677] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 73.850388][ T8677] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 73.858346][ T8677] Call Trace: [ 73.861608][ T8677] tcp_cdg_cong_avoid+0x5d6/0x1600 [ 73.866718][ T8677] tcp_ack+0x37c7/0x59e0 [ 73.870975][ T8677] ? tcp_fastretrans_alert+0x2f40/0x2f40 [ 73.876598][ T8677] ? tcp_reset+0x4a0/0x4a0 [ 73.881020][ T8677] ? __sanitizer_cov_trace_cmp4+0x1c/0x70 [ 73.886729][ T8677] ? ktime_get+0x30b/0x470 [ 73.891145][ T8677] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 73.897386][ T8677] tcp_rcv_established+0x5d7/0x2130 [ 73.902570][ T8677] ? tcp_data_queue+0x4b80/0x4b80 [ 73.907582][ T8677] ? mark_held_locks+0x9f/0xe0 [ 73.912336][ T8677] tcp_v4_do_rcv+0x5d4/0x880 [ 73.916932][ T8677] __release_sock+0x134/0x3b0 [ 73.921599][ T8677] __sk_flush_backlog+0x22/0x30 [ 73.926438][ T8677] tcp_sendmsg_locked+0x2817/0x2f10 [ 73.931642][ T8677] ? tcp_remove_empty_skb+0x8a0/0x8a0 [ 73.937000][ T8677] ? mark_held_locks+0x9f/0xe0 [ 73.941749][ T8677] ? __local_bh_enable_ip+0xa0/0x120 [ 73.947134][ T8677] tcp_sendmsg+0x2b/0x40 [ 73.951362][ T8677] inet_sendmsg+0x99/0xe0 [ 73.955677][ T8677] ? inet_send_prepare+0x4e0/0x4e0 [ 73.960777][ T8677] sock_sendmsg+0xcf/0x120 [ 73.965197][ T8677] __sys_sendto+0x21c/0x320 [ 73.969687][ T8677] ? __ia32_sys_getpeername+0xb0/0xb0 [ 73.975041][ T8677] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 73.981005][ T8677] ? __context_tracking_exit+0xb8/0xe0 [ 73.986451][ T8677] ? lock_downgrade+0x6e0/0x6e0 [ 73.991298][ T8677] ? lock_downgrade+0x6e0/0x6e0 [ 73.996131][ T8677] __x64_sys_sendto+0xdd/0x1b0 [ 74.000875][ T8677] ? lockdep_hardirqs_on+0x79/0x100 [ 74.006061][ T8677] ? syscall_enter_from_user_mode+0x21/0x70 [ 74.011938][ T8677] do_syscall_64+0x35/0xb0 [ 74.016334][ T8677] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 74.022219][ T8677] RIP: 0033:0x4438a9 [ 74.026091][ T8677] 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 [ 74.045684][ T8677] RSP: 002b:00007ffd7acf6b18 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 74.054100][ T8677] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004438a9 [ 74.062077][ T8677] RDX: 00000000fffffd46 RSI: 0000000020000240 RDI: 0000000000000004 [ 74.070225][ T8677] RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000001f4 [ 74.078180][ T8677] R10: 00000000000081f4 R11: 0000000000000246 R12: 00007ffd7acf6b40 [ 74.086219][ T8677] R13: 00000000000f4240 R14: 0000000000011ffa R15: 00007ffd7acf6b34 [ 74.094176][ T8677] Modules linked in: [ 74.101988][ T8677] ---[ end trace 33959e02e1d576f2 ]--- [ 74.107976][ T8677] RIP: 0010:tcp_reno_cong_avoid+0x288/0x310 [ 74.113897][ T8677] Code: ab 40 09 00 00 e8 48 2f d1 f9 45 85 e4 0f 85 aa fe ff ff 5b 5d 41 5c 41 5d 41 5e e9 f2 27 d1 f9 e8 ed 27 d1 f9 44 89 e0 31 d2 f5 41 01 c5 89 93 44 09 00 00 44 89 ab 40 09 00 00 e9 fb fe ff [ 74.134009][ T8677] RSP: 0018:ffffc90001c4f698 EFLAGS: 00010246 [ 74.140370][ T8677] RAX: 0000000000000011 RBX: ffff88801c320bc0 RCX: 0000000000000000 [ 74.148639][ T8677] RDX: 0000000000000000 RSI: ffffffff87a47373 RDI: 0000000000000003 [ 74.156801][ T8677] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000001 [ 74.164785][ T8677] R10: ffffffff87a47275 R11: 0000000000000000 R12: 0000000000000011 [ 74.172984][ T8677] R13: 0000000000000001 R14: 00000000ffffffff R15: ffff88801c321500 [ 74.181307][ T8677] FS: 0000000001060300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 [ 74.190676][ T8677] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 74.198093][ T8677] CR2: 0000000020200000 CR3: 0000000033f16000 CR4: 00000000001506e0 [ 74.206090][ T8677] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 74.214894][ T8677] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 74.222943][ T8677] Kernel panic - not syncing: Fatal exception [ 74.230210][ T8677] Kernel Offset: disabled [ 74.234523][ T8677] Rebooting in 86400 seconds..