------------[ cut here ]------------
kernel BUG at net/ipv4/ip_output.c:776!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 13597 Comm: syz-executor5 Not tainted 4.20.0-rc1-next-20181109+ #110
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ip_do_fragment+0x2447/0x2ad0 net/ipv4/ip_output.c:776
Code: ff 48 89 cf e8 7a 10 30 fb e9 dc ea ff ff 48 89 df e8 ad 10 30 fb e9 02 e7 ff ff e8 03 11 30 fb e9 97 e6 ff ff e8 99 b8 ec fa <0f> 0b 4c 89 f7 e8 4f 10 30 fb e9 2f e6 ff ff 4c 89 e7 e8 42 10 30
RSP: 0018:ffff880182c4e7c0 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff8801bef317c0 RCX: ffffc9000fe69000
kobject: 'loop0' (00000000ac86c66b): kobject_uevent_env
RDX: 000000000000c2b4 RSI: ffffffff8692f017 RDI: 0000000000000005
RBP: ffff880182c4e998 R08: ffff880184c364c0 R09: ffffed002f3b0942
R10: ffffed002f3b0944 R11: ffff880179d84a23 R12: ffff8801bef31884
R13: 00000000fffffff2 R14: ffff8801bef31890 R15: dffffc0000000000
FS:  00007f6af87d9700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000707158 CR3: 00000001801eb000 CR4: 00000000001406f0
kobject: 'loop0' (00000000ac86c66b): fill_kobj_path: path = '/devices/virtual/block/loop0'
Call Trace:
 ip_fragment.constprop.50+0x179/0x240 net/ipv4/ip_output.c:549
 ip_finish_output+0x58e/0xfa0 net/ipv4/ip_output.c:315
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_output+0x21d/0x8d0 net/ipv4/ip_output.c:405
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124
 iptunnel_xmit+0x56a/0x8d0 net/ipv4/ip_tunnel_core.c:91
 ip_tunnel_xmit+0x15b8/0x3c04 net/ipv4/ip_tunnel.c:787
 __gre_xmit+0x5e1/0x980 net/ipv4/ip_gre.c:451
 ipgre_xmit+0x3e7/0xba0 net/ipv4/ip_gre.c:705
 __netdev_start_xmit include/linux/netdevice.h:4356 [inline]
 netdev_start_xmit include/linux/netdevice.h:4365 [inline]
 xmit_one net/core/dev.c:3252 [inline]
 dev_hard_start_xmit+0x290/0xc70 net/core/dev.c:3268
 __dev_queue_xmit+0x2f9d/0x3ac0 net/core/dev.c:3838
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3871
 __bpf_tx_skb net/core/filter.c:2017 [inline]
 __bpf_redirect_common net/core/filter.c:2055 [inline]
 __bpf_redirect+0x5cf/0xb20 net/core/filter.c:2062
 ____bpf_clone_redirect net/core/filter.c:2095 [inline]
 bpf_clone_redirect+0x2f6/0x490 net/core/filter.c:2067
 bpf_prog_bebbfe2050753572+0x32a/0x1000
Modules linked in:
---[ end trace a10b8a48c62a4934 ]---
RIP: 0010:ip_do_fragment+0x2447/0x2ad0 net/ipv4/ip_output.c:776
Code: ff 48 89 cf e8 7a 10 30 fb e9 dc ea ff ff 48 89 df e8 ad 10 30 fb e9 02 e7 ff ff e8 03 11 30 fb e9 97 e6 ff ff e8 99 b8 ec fa <0f> 0b 4c 89 f7 e8 4f 10 30 fb e9 2f e6 ff ff 4c 89 e7 e8 42 10 30
RSP: 0018:ffff880182c4e7c0 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff8801bef317c0 RCX: ffffc9000fe69000
RDX: 000000000000c2b4 RSI: ffffffff8692f017 RDI: 0000000000000005
RBP: ffff880182c4e998 R08: ffff880184c364c0 R09: ffffed002f3b0942
R10: ffffed002f3b0944 R11: ffff880179d84a23 R12: ffff8801bef31884
R13: 00000000fffffff2 R14: ffff8801bef31890 R15: dffffc0000000000
FS:  00007f6af87d9700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000707158 CR3: 00000001801eb000 CR4: 00000000001406f0