------------[ cut here ]------------
kernel BUG at net/ipv4/ip_output.c:776!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 23821 Comm: syz-executor1 Not tainted 4.20.0-rc3+ #315
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ip_do_fragment+0x244e/0x2ad0 net/ipv4/ip_output.c:776
Code: ff 48 89 cf e8 33 41 22 fb e9 bf ea ff ff 48 89 df e8 66 41 22 fb e9 e5 e6 ff ff e8 bc 41 22 fb e9 7a e6 ff ff e8 32 c1 de fa <0f> 0b 4c 89 f7 e8 08 41 22 fb e9 12 e6 ff ff 4c 89 e7 e8 fb 40 22
kobject: 'loop2' (00000000eaf04606): kobject_uevent_env
RSP: 0018:ffff88816de6e7a0 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff8881c21afc00 RCX: ffffc90007de6000
RDX: 0000000000000df8 RSI: ffffffff86a0c9ae RDI: 0000000000000005
RBP: ffff88816de6e978 R08: ffff8881d8ac8340 R09: ffffed103116017a
kobject: 'loop2' (00000000eaf04606): fill_kobj_path: path = '/devices/virtual/block/loop2'
R10: ffffed103116017c R11: ffff888188b00be3 R12: ffff8881c21afcc4
kobject: 'loop3' (00000000b4ebb9fa): kobject_uevent_env
R13: 00000000fffffff2 R14: ffff8881c21afcd0 R15: dffffc0000000000
kobject: 'loop3' (00000000b4ebb9fa): fill_kobj_path: path = '/devices/virtual/block/loop3'
FS:  00007fda721a5700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33422000 CR3: 00000001b929c000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
kobject: 'loop3' (00000000b4ebb9fa): kobject_uevent_env
kobject: 'loop3' (00000000b4ebb9fa): fill_kobj_path: path = '/devices/virtual/block/loop3'
 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_output+0x21d/0x8d0 net/ipv4/ip_output.c:405
kobject: 'loop0' (000000006333d0e3): kobject_uevent_env
kobject: 'loop0' (000000006333d0e3): fill_kobj_path: path = '/devices/virtual/block/loop0'
 dst_output include/net/dst.h:444 [inline]
 ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124
 iptunnel_xmit+0x60a/0x980 net/ipv4/ip_tunnel_core.c:91
 ip_tunnel_xmit+0x15b8/0x3c04 net/ipv4/ip_tunnel.c:787
 __gre_xmit+0x5e9/0x990 net/ipv4/ip_gre.c:453
 ipgre_xmit+0x3e7/0xba0 net/ipv4/ip_gre.c:707
 __netdev_start_xmit include/linux/netdevice.h:4365 [inline]
 netdev_start_xmit include/linux/netdevice.h:4374 [inline]
 xmit_one net/core/dev.c:3259 [inline]
 dev_hard_start_xmit+0x295/0xc80 net/core/dev.c:3275
 __dev_queue_xmit+0x2f7a/0x3ae0 net/core/dev.c:3845
 dev_queue_xmit+0x17/0x20 net/core/dev.c:3878
 __bpf_tx_skb net/core/filter.c:2013 [inline]
 __bpf_redirect_common net/core/filter.c:2051 [inline]
 __bpf_redirect+0x5df/0xb60 net/core/filter.c:2058
 ____bpf_clone_redirect net/core/filter.c:2091 [inline]
 bpf_clone_redirect+0x2f6/0x490 net/core/filter.c:2063
 bpf_prog_bebbfe2050753572+0xf03/0x1000
Modules linked in:
---[ end trace a9bc1e63373ec89c ]---
RIP: 0010:ip_do_fragment+0x244e/0x2ad0 net/ipv4/ip_output.c:776
Code: ff 48 89 cf e8 33 41 22 fb e9 bf ea ff ff 48 89 df e8 66 41 22 fb e9 e5 e6 ff ff e8 bc 41 22 fb e9 7a e6 ff ff e8 32 c1 de fa <0f> 0b 4c 89 f7 e8 08 41 22 fb e9 12 e6 ff ff 4c 89 e7 e8 fb 40 22
RSP: 0018:ffff88816de6e7a0 EFLAGS: 00010212
RAX: 0000000000040000 RBX: ffff8881c21afc00 RCX: ffffc90007de6000
RDX: 0000000000000df8 RSI: ffffffff86a0c9ae RDI: 0000000000000005
RBP: ffff88816de6e978 R08: ffff8881d8ac8340 R09: ffffed103116017a
R10: ffffed103116017c R11: ffff888188b00be3 R12: ffff8881c21afcc4
R13: 00000000fffffff2 R14: ffff8881c21afcd0 R15: dffffc0000000000
FS:  00007fda721a5700(0000) GS:ffff8881dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33422000 CR3: 00000001b929c000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400