[ 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 '10.128.0.54' (ECDSA) to the list of known hosts. syzkaller login: [ 36.875765] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 37.007285] 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. [ 37.025984] skbuff: skb_under_panic: text:00000000004ad155 len:48 put:8 head:00000000ccce9973 data:0000000088195784 tail:0x2c end:0xc0 dev:sit1 [ 37.039371] ------------[ cut here ]------------ [ 37.044195] kernel BUG at net/core/skbuff.c:104! [ 37.049118] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 37.054480] CPU: 0 PID: 8152 Comm: syz-executor008 Not tainted 4.19.211-syzkaller #0 [ 37.062340] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.071688] RIP: 0010:skb_panic+0x172/0x174 [ 37.076006] Code: 4c 24 10 8b 8b 80 00 00 00 41 56 45 89 e8 4c 89 e2 41 57 48 89 ee 48 c7 c7 60 4f 4c 89 ff 74 24 10 ff 74 24 20 e8 f1 18 e2 ff <0f> 0b e8 7f e7 50 f9 4c 8b 64 24 18 e8 c5 aa 86 f9 48 c7 c1 c0 58 [ 37.095183] RSP: 0018:ffff888096a0eb50 EFLAGS: 00010286 [ 37.100612] RAX: 0000000000000083 RBX: ffff888098a84d00 RCX: 0000000000000000 [ 37.107870] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1012d41d5c [ 37.115120] RBP: ffffffff894c58c0 R08: 0000000000000083 R09: 0000000000000000 [ 37.122373] R10: 0000000000000005 R11: 0000000000000000 R12: ffffffff86eec28f [ 37.129622] R13: 0000000000000008 R14: ffff8880953d6880 R15: 00000000000000c0 [ 37.136875] FS: 00005555561d7300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 37.145077] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.150934] CR2: 00000000200004c0 CR3: 00000000b4a65000 CR4: 00000000003406f0 [ 37.158183] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.165437] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.172684] Call Trace: [ 37.175432] ? gue_encap_hlen+0x70/0x70 [ 37.179951] ? fou_build_udp+0x2f/0x360 [ 37.183910] skb_push.cold+0x24/0x24 [ 37.187607] fou_build_udp+0x2f/0x360 [ 37.191387] gue_build_header+0xf7/0x140 [ 37.195428] ? fou_build_udp+0x360/0x360 [ 37.199479] ? check_preemption_disabled+0x41/0x280 [ 37.204479] ? fou_build_udp+0x360/0x360 [ 37.208522] ip_tunnel_xmit+0x7ed/0x3850 [ 37.212565] ? ip_md_tunnel_xmit+0x12a0/0x12a0 [ 37.217132] ? __sanitizer_cov_trace_switch+0x4b/0x80 [ 37.222303] sit_tunnel_xmit+0x4ef/0x28d0 [ 37.226440] ? sit_init_net+0xa10/0xa10 [ 37.230395] ? netif_skb_features+0x5c1/0xb30 [ 37.234901] ? check_preemption_disabled+0x41/0x280 [ 37.239985] dev_hard_start_xmit+0x1a8/0x920 [ 37.244390] __dev_queue_xmit+0x269d/0x2e00 [ 37.248701] ? __neigh_create+0x7d9/0x1c40 [ 37.252925] ? __local_bh_enable_ip+0x159/0x270 [ 37.257574] ? netdev_pick_tx+0x2f0/0x2f0 [ 37.261703] ? lockdep_hardirqs_on+0x288/0x5c0 [ 37.266290] ? __neigh_create+0x11c9/0x1c40 [ 37.270594] ? __local_bh_enable_ip+0xb0/0x270 [ 37.275159] ? __neigh_create+0xb8e/0x1c40 [ 37.279373] ? nf_ct_deliver_cached_events+0x205/0x630 [ 37.284633] ip_finish_output2+0xd76/0x15a0 [ 37.288946] ? nf_conntrack_eventmask_report+0x700/0x700 [ 37.294376] ? ip_send_check+0xb0/0xb0 [ 37.298243] ? ip_output+0x3a5/0x5f0 [ 37.301937] ip_finish_output+0xae9/0x10b0 [ 37.306160] ip_output+0x203/0x5f0 [ 37.309687] ? ip_mc_output+0xec0/0xec0 [ 37.313642] ? ip_fragment.constprop.0+0x240/0x240 [ 37.318549] ? ip_do_fragment+0x2620/0x2620 [ 37.322847] ip_local_out+0xaf/0x170 [ 37.326546] ip_send_skb+0x3e/0xe0 [ 37.330064] udp_send_skb+0x6a4/0x1170 [ 37.333933] udp_sendmsg+0x1cb4/0x2550 [ 37.337812] ? ip_do_fragment+0x2620/0x2620 [ 37.342135] ? __save_stack_trace+0x72/0x190 [ 37.346522] ? udp_seq_next+0x80/0x80 [ 37.350302] ? __read_once_size_nocheck.constprop.0+0x10/0x10 [ 37.356257] ? deref_stack_reg+0x1d0/0x1d0 [ 37.360475] ? static_obj+0x50/0x50 [ 37.364093] ? __lock_acquire+0x6de/0x3ff0 [ 37.368310] ? __save_stack_trace+0xaf/0x190 [ 37.372707] udpv6_sendmsg+0x14b2/0x2ae0 [ 37.376751] ? udp_v6_push_pending_frames+0x360/0x360 [ 37.381922] ? mark_held_locks+0xf0/0xf0 [ 37.385967] ? mark_held_locks+0xf0/0xf0 [ 37.390008] ? mark_held_locks+0xa6/0xf0 [ 37.394050] ? mark_held_locks+0xf0/0xf0 [ 37.398119] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 37.402940] ? reacquire_held_locks+0xb5/0x430 [ 37.407500] ? release_sock+0x1b/0x1b0 [ 37.411367] ? ip6_datagram_release_cb+0x2e7/0x540 [ 37.416278] ? inet_autobind+0x130/0x190 [ 37.420330] ? lock_downgrade+0x720/0x720 [ 37.424457] ? __local_bh_enable_ip+0x159/0x270 [ 37.429109] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 37.433670] ? inet_autobind+0x130/0x190 [ 37.437713] inet_sendmsg+0x132/0x5a0 [ 37.441496] ? security_socket_sendmsg+0x83/0xb0 [ 37.446231] ? inet_recvmsg+0x5c0/0x5c0 [ 37.450207] sock_sendmsg+0xc3/0x120 [ 37.453908] ___sys_sendmsg+0x3b3/0x8e0 [ 37.457874] ? copy_msghdr_from_user+0x440/0x440 [ 37.462620] ? aa_af_perm+0x230/0x230 [ 37.466408] ? nlmsg_notify+0x1f0/0x1f0 [ 37.470399] ? kernel_recvmsg+0x220/0x220 [ 37.474539] ? check_preemption_disabled+0x41/0x280 [ 37.479544] ? ___sys_sendmsg+0x4ba/0x8e0 [ 37.483851] ? rcu_read_lock_sched_held+0x16c/0x1d0 [ 37.488855] ? ___sys_sendmsg+0x4bf/0x8e0 [ 37.492988] ? mark_held_locks+0xf0/0xf0 [ 37.497055] ? copy_msghdr_from_user+0x440/0x440 [ 37.501877] ? lock_downgrade+0x720/0x720 [ 37.506007] ? __fdget+0x1a0/0x230 [ 37.509531] __sys_sendmmsg+0x195/0x470 [ 37.513487] ? __ia32_sys_sendmsg+0x220/0x220 [ 37.518059] ? __fdget+0x1a0/0x230 [ 37.521584] ? __x64_sys_sendmsg+0x159/0x220 [ 37.525972] ? __sys_sendmsg+0x1b0/0x1b0 [ 37.530023] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 37.535368] __x64_sys_sendmmsg+0x99/0x100 [ 37.539590] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 37.544163] do_syscall_64+0xf9/0x620 [ 37.547947] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 37.553116] RIP: 0033:0x7f2b861d0459 [ 37.556985] Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 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 [ 37.576049] RSP: 002b:00007ffe758271c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 [ 37.583913] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f2b861d0459 [ 37.591163] RDX: 0000000000000001 RSI: 00000000200017c0 RDI: 0000000000000003 [ 37.598414] RBP: 0000000000000000 R08: 000000008623de40 R09: 000000008623de40 [ 37.605659] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000907b [ 37.612906] R13: 00007ffe758271f0 R14: 00007ffe758271e0 R15: 00007ffe758271d4 [ 37.620168] Modules linked in: [ 37.623419] ---[ end trace 2484b37f1607e532 ]--- [ 37.628202] RIP: 0010:skb_panic+0x172/0x174 [ 37.632522] Code: 4c 24 10 8b 8b 80 00 00 00 41 56 45 89 e8 4c 89 e2 41 57 48 89 ee 48 c7 c7 60 4f 4c 89 ff 74 24 10 ff 74 24 20 e8 f1 18 e2 ff <0f> 0b e8 7f e7 50 f9 4c 8b 64 24 18 e8 c5 aa 86 f9 48 c7 c1 c0 58 [ 37.651465] RSP: 0018:ffff888096a0eb50 EFLAGS: 00010286 [ 37.656869] RAX: 0000000000000083 RBX: ffff888098a84d00 RCX: 0000000000000000 [ 37.664408] RDX: 0000000000000000 RSI: ffffffff814dff01 RDI: ffffed1012d41d5c [ 37.671705] RBP: ffffffff894c58c0 R08: 0000000000000083 R09: 0000000000000000 [ 37.679169] R10: 0000000000000005 R11: 0000000000000000 R12: ffffffff86eec28f [ 37.686473] R13: 0000000000000008 R14: ffff8880953d6880 R15: 00000000000000c0 [ 37.693828] FS: 00005555561d7300(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 [ 37.702075] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 37.707982] CR2: 00000000200004c0 CR3: 00000000b4a65000 CR4: 00000000003406f0 [ 37.715282] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 37.722552] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 37.729840] Kernel panic - not syncing: Fatal exception in interrupt [ 37.736411] Kernel Offset: disabled [ 37.740021] Rebooting in 86400 seconds..