------------[ cut here ]------------
kernel BUG at net/ipv4/ip_output.c:777!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 16972 Comm: syz-executor2 Not tainted 4.20.0+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ip_do_fragment+0x2317/0x2950 net/ipv4/ip_output.c:777
Code: 8b 85 f0 fe ff ff e9 91 e9 ff ff 4c 89 f7 e8 10 01 31 fb e9 79 ea ff ff 4c 89 f7 e8 03 01 31 fb e9 e0 e6 ff ff e8 49 d3 ed fa <0f> 0b 48 89 df e8 2f 01 31 fb e9 a0 e9 ff ff 4c 89 ef 48 89 95 f0
RSP: 0018:ffff88808c476b50 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff888098102180 RCX: ffffc9000a042000
RDX: 0000000000013399 RSI: ffffffff86936b57 RDI: 0000000000000005
RBP: ffff88808c476ca8 R08: ffff88809745c100 R09: ffffed1012098e4d
R10: ffffed1012098e4c R11: ffff8880904c7263 R12: ffff8880981020c0
R13: ffff888098102174 R14: 00000000fffffff2 R15: dffffc0000000000
FS:  00007fb69a353700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffca36fdfe8 CR3: 000000009a3e4000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ip_fragment.constprop.0+0x176/0x240 net/ipv4/ip_output.c:550
 ip_finish_output+0x69f/0xf60 net/ipv4/ip_output.c:315
 NF_HOOK_COND include/linux/netfilter.h:278 [inline]
 ip_output+0x226/0x880 net/ipv4/ip_output.c:405
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0xc4/0x1b0 net/ipv4/ip_output.c:124
 iptunnel_xmit+0x58e/0x980 net/ipv4/ip_tunnel_core.c:91
kobject: 'loop4' (00000000fb879824): kobject_uevent_env
 ip_tunnel_xmit+0x159f/0x3c70 net/ipv4/ip_tunnel.c:787
kobject: 'loop4' (00000000fb879824): fill_kobj_path: path = '/devices/virtual/block/loop4'
 __gre_xmit+0x5e9/0x9a0 net/ipv4/ip_gre.c:453
kobject: 'loop3' (0000000051ed74eb): kobject_uevent_env
 ipgre_xmit+0x3dd/0xb10 net/ipv4/ip_gre.c:707
kobject: 'loop3' (0000000051ed74eb): fill_kobj_path: path = '/devices/virtual/block/loop3'
 __netdev_start_xmit include/linux/netdevice.h:4382 [inline]
 netdev_start_xmit include/linux/netdevice.h:4391 [inline]
 xmit_one net/core/dev.c:3278 [inline]
 dev_hard_start_xmit+0x261/0xc70 net/core/dev.c:3294
 __dev_queue_xmit+0x2f8a/0x3a60 net/core/dev.c:3864
 dev_queue_xmit+0x18/0x20 net/core/dev.c:3897
 __bpf_tx_skb net/core/filter.c:2014 [inline]
 __bpf_redirect_common net/core/filter.c:2052 [inline]
 __bpf_redirect+0x5dc/0xb70 net/core/filter.c:2059
 ____bpf_clone_redirect net/core/filter.c:2092 [inline]
 bpf_clone_redirect+0x2ca/0x470 net/core/filter.c:2064
 bpf_prog_bebbfe2050753572+0x889/0x1000
Modules linked in:
---[ end trace da4d53042c5e561d ]---
RIP: 0010:ip_do_fragment+0x2317/0x2950 net/ipv4/ip_output.c:777
Code: 8b 85 f0 fe ff ff e9 91 e9 ff ff 4c 89 f7 e8 10 01 31 fb e9 79 ea ff ff 4c 89 f7 e8 03 01 31 fb e9 e0 e6 ff ff e8 49 d3 ed fa <0f> 0b 48 89 df e8 2f 01 31 fb e9 a0 e9 ff ff 4c 89 ef 48 89 95 f0
RSP: 0018:ffff88808c476b50 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff888098102180 RCX: ffffc9000a042000
RDX: 0000000000013399 RSI: ffffffff86936b57 RDI: 0000000000000005
RBP: ffff88808c476ca8 R08: ffff88809745c100 R09: ffffed1012098e4d
R10: ffffed1012098e4c R11: ffff8880904c7263 R12: ffff8880981020c0
R13: ffff888098102174 R14: 00000000fffffff2 R15: dffffc0000000000
FS:  00007fb69a353700(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffca36fdfe8 CR3: 000000009a3e4000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400