------------[ cut here ]------------
: caps=(0x0000000000000000, 0x00000144401d3c69) len=17928 data_len=16400 gso_size=8928 gso_type=16 ip_summed=3
WARNING: CPU: 1 PID: 16983 at net/core/dev.c:2635 skb_warn_bad_offload+0x2c9/0x3d0 net/core/dev.c:2630
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 16983 Comm: syz-executor6 Not tainted 4.16.0-rc2+ #248
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 __warn+0x1dc/0x200 kernel/panic.c:547
 report_bug+0x211/0x2d0 lib/bug.c:184
 fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
 fixup_bug arch/x86/kernel/traps.c:247 [inline]
 do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
 invalid_op+0x58/0x80 arch/x86/entry/entry_64.S:957
RIP: 0010:skb_warn_bad_offload+0x2c9/0x3d0 net/core/dev.c:2630
RSP: 0018:ffff8801ce5fe638 EFLAGS: 00010286
RAX: dffffc0000000008 RBX: 0000000000000000 RCX: ffffffff815ac30e
RDX: 00000000000053a4 RSI: ffffc90004df4000 RDI: 1ffff10039cbfc4c
RBP: ffff8801ce5fe690 R08: 1ffff10039cbfc0e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000003
R13: ffffffff868403c0 R14: ffff8801d6854420 R15: 0000000000000010
 skb_checksum_help+0x7c4/0xb60 net/core/dev.c:2651
 checksum_tg+0x59/0x70 net/netfilter/xt_CHECKSUM.c:29
 ip6t_do_table+0xc2a/0x1aa0 net/ipv6/netfilter/ip6_tables.c:369
 ip6t_mangle_out net/ipv6/netfilter/ip6table_mangle.c:55 [inline]
 ip6table_mangle_hook+0x40b/0x920 net/ipv6/netfilter/ip6table_mangle.c:77
 nf_hook_entry_hookfn include/linux/netfilter.h:120 [inline]
 nf_hook_slow+0xba/0x1a0 net/netfilter/core.c:483
 nf_hook include/linux/netfilter.h:243 [inline]
 NF_HOOK include/linux/netfilter.h:286 [inline]
 ip6_xmit+0x10ec/0x2260 net/ipv6/ip6_output.c:277
 inet6_csk_xmit+0x2fc/0x580 net/ipv6/inet6_connection_sock.c:139
 tcp_transmit_skb+0x1b12/0x3960 net/ipv4/tcp_output.c:1176
 tcp_write_xmit+0x882/0x5430 net/ipv4/tcp_output.c:2373
 tcp_push_one+0xca/0x100 net/ipv4/tcp_output.c:2560
 tcp_sendmsg_locked+0xaea/0x3960 net/ipv4/tcp.c:1379
 tcp_sendmsg+0x2f/0x50 net/ipv4/tcp.c:1436
 inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:763
 sock_sendmsg_nosec net/socket.c:629 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:639
 ___sys_sendmsg+0x767/0x8b0 net/socket.c:2047
 __sys_sendmsg+0xe5/0x210 net/socket.c:2081
 SYSC_sendmsg net/socket.c:2092 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2088
 do_syscall_64+0x280/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x453d69
RSP: 002b:00007f852f090c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f852f0916d4 RCX: 0000000000453d69
RDX: 0000000000000000 RSI: 0000000020484fc8 RDI: 0000000000000019
RBP: 000000000072bf58 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004c1 R14: 00000000006f72b8 R15: 0000000000000001
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..