------------[ cut here ]------------
kernel BUG at net/ipv4/ip_output.c:776!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 23296 Comm: syz-executor5 Not tainted 4.20.0-rc3+ #121
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 2a 36 23 fb e9 dc ea ff ff 48 89 df e8 5d 36 23 fb e9 02 e7 ff ff e8 b3 36 23 fb e9 97 e6 ff ff e8 29 e7 df fa <0f> 0b 4c 89 f7 e8 ff 35 23 fb e9 2f e6 ff ff 4c 89 e7 e8 f2 35 23
RSP: 0018:ffff888187226658 EFLAGS: 00010216
kobject: 'loop0' (000000001c70c038): kobject_uevent_env
RAX: 0000000000040000 RBX: ffff88818396d840 RCX: ffffc9000fe52000
RDX: 0000000000009d51 RSI: ffffffff869fa3c7 RDI: 0000000000000005
RBP: ffff888187226830 R08: ffff888182280140 R09: ffffed1038c57088
R10: ffffed1038c5708a R11: ffff8881c62b8453 R12: ffff88818396d904
R13: 00000000fffffff2 R14: ffff88818396d910 R15: dffffc0000000000
FS:  00007fc5ef051700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff4af36608 CR3: 00000001b25e0000 CR4: 00000000001406e0
kobject: 'loop0' (000000001c70c038): fill_kobj_path: path = '/devices/virtual/block/loop0'
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kobject: 'loop4' (000000008fd4a343): kobject_uevent_env
kobject: 'loop4' (000000008fd4a343): fill_kobj_path: path = '/devices/virtual/block/loop4'
 ip_fragment.constprop.50+0x179/0x240 net/ipv4/ip_output.c:549
 ip_finish_output+0x6b4/0xfa0 net/ipv4/ip_output.c:315
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_mc_output+0x2c4/0x15b0 net/ipv4/ip_output.c:390
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124
 iptunnel_xmit+0x63b/0x9c0 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+0x295/0xc80 net/core/dev.c:3268
 __dev_queue_xmit+0x2f71/0x3ad0 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+0xd0a/0x1000
Modules linked in:
---[ end trace 70f46ef9a6aa1356 ]---
RIP: 0010:ip_do_fragment+0x2447/0x2ad0 net/ipv4/ip_output.c:776
Code: ff 48 89 cf e8 2a 36 23 fb e9 dc ea ff ff 48 89 df e8 5d 36 23 fb e9 02 e7 ff ff e8 b3 36 23 fb e9 97 e6 ff ff e8 29 e7 df fa <0f> 0b 4c 89 f7 e8 ff 35 23 fb e9 2f e6 ff ff 4c 89 e7 e8 f2 35 23
RSP: 0018:ffff888187226658 EFLAGS: 00010216
kobject: 'loop1' (0000000023eb43c4): kobject_uevent_env
RAX: 0000000000040000 RBX: ffff88818396d840 RCX: ffffc9000fe52000
RDX: 0000000000009d51 RSI: ffffffff869fa3c7 RDI: 0000000000000005
RBP: ffff888187226830 R08: ffff888182280140 R09: ffffed1038c57088
R10: ffffed1038c5708a R11: ffff8881c62b8453 R12: ffff88818396d904
R13: 00000000fffffff2 R14: ffff88818396d910 R15: dffffc0000000000
FS:  00007fc5ef051700(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000
kobject: 'loop1' (0000000023eb43c4): fill_kobj_path: path = '/devices/virtual/block/loop1'
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff4af36608 CR3: 00000001b25e0000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400