Warning: Permanently added '10.128.1.4' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 34.824594] ip_tables: iptables: counters copy to user failed while replacing table [ 34.837930] ------------[ cut here ]------------ [ 34.842778] kernel BUG at net/core/dev.c:2648! [ 34.847633] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 34.853022] Modules linked in: [ 34.856219] CPU: 0 PID: 6341 Comm: syz-executor763 Not tainted 4.14.175-syzkaller #0 [ 34.864097] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.873448] task: ffff8880846780c0 task.stack: ffff888097cd8000 [ 34.879508] RIP: 0010:skb_checksum_help+0x5fd/0x830 [ 34.884603] RSP: 0018:ffff888097cdf468 EFLAGS: 00010297 [ 34.889962] RAX: ffff8880846780c0 RBX: 00000000000000e0 RCX: 0000000000000120 [ 34.897249] RDX: 0000000000000000 RSI: 000000000000001c RDI: 0000000000000000 [ 34.904513] RBP: ffff88809dd2cb40 R08: ffff88809dd2cbc0 R09: 0000000000000000 [ 34.911769] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809dd2cbc4 [ 34.919023] R13: ffff88809dd2cc0c R14: ffff88809dd2cbd0 R15: 0000000000000000 [ 34.926517] FS: 0000000000f03880(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 [ 34.934764] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 34.940972] CR2: 0000000000000000 CR3: 000000008d0ca000 CR4: 00000000001406f0 [ 34.948225] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 34.955486] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 34.962735] Call Trace: [ 34.965316] checksum_tg+0x52/0x65 [ 34.968835] ipt_do_table+0xaaf/0x16d0 [ 34.972703] ? get_info+0x530/0x530 [ 34.976318] ? ___pskb_trim+0x6c8/0xf20 [ 34.980356] ? save_trace+0x220/0x290 [ 34.984149] iptable_mangle_hook+0x9c/0x560 [ 34.988464] nf_hook_slow+0xa5/0x1a0 [ 34.992170] ip_rcv+0xb9e/0xfec [ 34.995428] ? ip_local_deliver+0x450/0x450 [ 34.999724] ? ip_local_deliver_finish+0xaa0/0xaa0 [ 35.004629] ? ip_local_deliver+0x450/0x450 [ 35.008929] __netif_receive_skb_core+0x1e50/0x2c00 [ 35.013975] ? trace_hardirqs_on+0x10/0x10 [ 35.018202] ? enqueue_to_backlog+0xd20/0xd20 [ 35.022690] ? finish_task_switch+0x178/0x620 [ 35.027169] ? lock_acquire+0x170/0x3f0 [ 35.031127] ? __netif_receive_skb+0x27/0x1a0 [ 35.035651] __netif_receive_skb+0x27/0x1a0 [ 35.039955] netif_receive_skb_internal+0xd7/0x580 [ 35.044865] ? dev_cpu_dead+0x8c0/0x8c0 [ 35.048818] ? rcu_lockdep_current_cpu_online+0xed/0x140 [ 35.054259] ? rcu_read_lock_sched_held+0x10a/0x130 [ 35.059253] ? netif_receive_skb+0x47/0x2a0 [ 35.063553] tun_rx_batched.isra.0+0x46c/0x7a0 [ 35.068112] ? tun_sock_write_space+0x190/0x190 [ 35.072771] ? ___preempt_schedule_notrace+0x16/0x27 [ 35.077867] ? preempt_schedule_notrace+0x99/0x120 [ 35.082777] ? ___preempt_schedule_notrace+0x16/0x27 [ 35.087871] tun_get_user+0xcde/0x3880 [ 35.091753] ? tun_net_xmit+0xf10/0xf10 [ 35.095711] ? find_held_lock+0x2d/0x110 [ 35.099762] ? __tun_get+0x11c/0x220 [ 35.103460] ? lock_downgrade+0x6e0/0x6e0 [ 35.107592] tun_chr_write_iter+0xcf/0x179 [ 35.112596] __vfs_write+0x44e/0x630 [ 35.116354] ? kernel_read+0x110/0x110 [ 35.120281] ? avc_policy_seqno+0x5/0x10 [ 35.124326] ? selinux_file_permission+0x7a/0x440 [ 35.129595] ? rw_verify_area+0xe1/0x2a0 [ 35.134217] vfs_write+0x192/0x4e0 [ 35.137740] SyS_write+0xf2/0x210 [ 35.141177] ? SyS_read+0x210/0x210 [ 35.144940] ? do_syscall_64+0x4c/0x640 [ 35.148939] ? SyS_read+0x210/0x210 [ 35.152549] do_syscall_64+0x1d5/0x640 [ 35.156417] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 35.161586] RIP: 0033:0x441729 [ 35.164755] RSP: 002b:00007fffbaae6ae8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 35.172450] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441729 [ 35.179737] RDX: 000000000000fdef RSI: 00000000200000c0 RDI: 0000000000000003 [ 35.187044] RBP: 656c6c616b7a7973 R08: 0000000000001c00 R09: 0000000000402fb0 [ 35.194299] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402fb0 [ 35.201603] R13: 0000000000403040 R14: 0000000000000000 R15: 0000000000000000 [ 35.208857] Code: 8b 7c 24 28 e8 75 e0 85 fc e9 0d fe ff ff e8 4b 8e 5c fc 48 89 ef 41 bc ea ff ff ff e8 9d b3 ff ff e9 94 fe ff ff e8 33 8e 5c fc <0f> 0b e8 2c 8e 5c fc 0f 0b e8 25 8e 5c fc 48 8b 54 24 28 48 b8 [ 35.227931] RIP: skb_checksum_help+0x5fd/0x830 RSP: ffff888097cdf468 [ 35.234469] ---[ end trace dd20dd799c821843 ]--- [ 35.239239] Kernel panic - not syncing: Fatal exception in interrupt [ 35.246850] Kernel Offset: disabled [ 35.250471] Rebooting in 86400 seconds..