------------[ cut here ]------------
WARNING: CPU: 0 PID: 3568 at net/core/dev.c:3268 skb_checksum_help+0x180/0x1d4 net/core/dev.c:3268
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 0 PID: 3568 Comm: syz-executor.1 Not tainted 6.4.0-rc5-syzkaller #0
Hardware name: ARM-Versatile Express
Backtrace: 
[<817da2d8>] (dump_backtrace) from [<817da3cc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:256)
 r7:00000000 r6:826229c4 r5:60000093 r4:81f9d8a4
[<817da3b4>] (show_stack) from [<817f6ea8>] (__dump_stack lib/dump_stack.c:88 [inline])
[<817da3b4>] (show_stack) from [<817f6ea8>] (dump_stack_lvl+0x48/0x54 lib/dump_stack.c:106)
[<817f6e60>] (dump_stack_lvl) from [<817f6ecc>] (dump_stack+0x18/0x1c lib/dump_stack.c:113)
 r5:00000000 r4:82850d14
[<817f6eb4>] (dump_stack) from [<817daec4>] (panic+0x120/0x370 kernel/panic.c:340)
[<817dada4>] (panic) from [<80241fd0>] (print_tainted+0x0/0xa0 kernel/panic.c:236)
 r3:8260c488 r2:00000001 r1:81f86998 r0:81f8e3a8
 r7:813333c4
[<80241f4c>] (check_panic_on_warn) from [<802421c4>] (__warn+0x7c/0x180 kernel/panic.c:673)
[<80242148>] (__warn) from [<802423a0>] (warn_slowpath_fmt+0xd8/0x1d8 kernel/panic.c:697)
 r8:00000009 r7:00000cc4 r6:82130de8 r5:8260c960 r4:824adf7c
[<802422cc>] (warn_slowpath_fmt) from [<813333c4>] (skb_checksum_help+0x180/0x1d4 net/core/dev.c:3268)
 r10:0000002f r9:00000000 r8:832c7b00 r7:00000000 r6:000006a8 r5:827e21ac
 r4:84a85300
[<81333244>] (skb_checksum_help) from [<814c7958>] (ip_do_fragment+0x424/0x704 net/ipv4/ip_output.c:775)
 r7:00000000 r6:00000000 r5:84ea0000 r4:84a85300
[<814c7534>] (ip_do_fragment) from [<814c7c94>] (ip_fragment.constprop.0+0x5c/0x104 net/ipv4/ip_output.c:582)
 r10:0000002f r9:00000000 r8:84a85d80 r7:000005dc r6:00000000 r5:84ea0000
 r4:84a85300
[<814c7c38>] (ip_fragment.constprop.0) from [<814c7e80>] (ip_finish_output_gso net/ipv4/ip_output.c:280 [inline])
[<814c7c38>] (ip_fragment.constprop.0) from [<814c7e80>] (__ip_finish_output net/ipv4/ip_output.c:302 [inline])
[<814c7c38>] (ip_fragment.constprop.0) from [<814c7e80>] (__ip_finish_output+0x144/0x184 net/ipv4/ip_output.c:289)
 r5:84ea0000 r4:00000000
[<814c7d3c>] (__ip_finish_output) from [<814c7eec>] (ip_finish_output+0x2c/0xcc net/ipv4/ip_output.c:317)
 r9:832c7b00 r8:84f69800 r7:84ea0000 r6:00000000 r5:84a85180 r4:00000000
[<814c7ec0>] (ip_finish_output) from [<814c8064>] (NF_HOOK_COND include/linux/netfilter.h:292 [inline])
[<814c7ec0>] (ip_finish_output) from [<814c8064>] (ip_output+0xd8/0x170 net/ipv4/ip_output.c:431)
 r7:858d8800 r6:00000000 r5:84ea0000 r4:84a85180
[<814c7f8c>] (ip_output) from [<814c916c>] (dst_output include/net/dst.h:458 [inline])
[<814c7f8c>] (ip_output) from [<814c916c>] (ip_local_out+0x40/0x44 net/ipv4/ip_output.c:126)
 r8:84ea0000 r7:00000000 r6:00000000 r5:84ea0000 r4:84a85180
[<814c912c>] (ip_local_out) from [<81530708>] (iptunnel_xmit+0x148/0x268 net/ipv4/ip_tunnel_core.c:82)
 r7:00000000 r6:84f69800 r5:00000000 r4:84a85180
[<815305c0>] (iptunnel_xmit) from [<8153ae50>] (ip_tunnel_xmit+0x800/0xae4 net/ipv4/ip_tunnel.c:831)
 r10:832c7b00 r9:00000024 r8:0000000f r7:0000000e r6:00000024 r5:84f69800
 r4:84a85180
[<8153a650>] (ip_tunnel_xmit) from [<8154b830>] (__gre_xmit+0x140/0x234 net/ipv4/ip_gre.c:469)
 r10:00000004 r9:00000000 r8:00000008 r7:86674048 r6:84f69800 r5:84a85180
 r4:00000000
[<8154b6f0>] (__gre_xmit) from [<8154c25c>] (ipgre_xmit+0x19c/0x22c net/ipv4/ip_gre.c:661)
 r10:8260ee7c r9:00000000 r8:84664680 r7:84f69800 r6:86674048 r5:84f69800
 r4:84a85180
[<8154c0c0>] (ipgre_xmit) from [<8133b4fc>] (__netdev_start_xmit include/linux/netdevice.h:4918 [inline])
[<8154c0c0>] (ipgre_xmit) from [<8133b4fc>] (netdev_start_xmit include/linux/netdevice.h:4932 [inline])
[<8154c0c0>] (ipgre_xmit) from [<8133b4fc>] (xmit_one net/core/dev.c:3578 [inline])
[<8154c0c0>] (ipgre_xmit) from [<8133b4fc>] (dev_hard_start_xmit+0xc0/0x2a4 net/core/dev.c:3594)
 r7:84f69800 r6:00000000 r5:84a85180 r4:81c3e444
[<8133b43c>] (dev_hard_start_xmit) from [<8133c2f0>] (__dev_queue_xmit+0xaf8/0xdc8 net/core/dev.c:4244)
 r10:00000006 r9:0000061f r8:824b1288 r7:841fc000 r6:84f69800 r5:ed385c60
 r4:84a85180
[<8133b7f8>] (__dev_queue_xmit) from [<81634eec>] (dev_queue_xmit include/linux/netdevice.h:3088 [inline])
[<8133b7f8>] (__dev_queue_xmit) from [<81634eec>] (packet_xmit net/packet/af_packet.c:276 [inline])
[<8133b7f8>] (__dev_queue_xmit) from [<81634eec>] (packet_xmit+0x9c/0x100 net/packet/af_packet.c:273)
 r10:86677f00 r9:860cf000 r8:84a85180 r7:0000000a r6:84f69800 r5:00003000
 r4:84a85180
[<81634e50>] (packet_xmit) from [<81638640>] (packet_snd net/packet/af_packet.c:3081 [inline])
[<81634e50>] (packet_xmit) from [<81638640>] (packet_sendmsg+0xec8/0x1448 net/packet/af_packet.c:3113)
 r7:0000000a r6:84f69800 r5:00003000 r4:860cf000
[<81637778>] (packet_sendmsg) from [<8130d9b8>] (sock_sendmsg_nosec net/socket.c:724 [inline])
[<81637778>] (packet_sendmsg) from [<8130d9b8>] (sock_sendmsg+0x44/0x78 net/socket.c:747)
 r10:ed385dd4 r9:00000000 r8:00000000 r7:00000000 r6:85244f00 r5:ed385f30
 r4:00000000
[<8130d974>] (sock_sendmsg) from [<8130e4d0>] (____sys_sendmsg+0x210/0x2bc net/socket.c:2503)
 r7:00000000 r6:85244f00 r5:00000000 r4:ed385f30
[<8130e2c0>] (____sys_sendmsg) from [<81310100>] (___sys_sendmsg+0x74/0xac net/socket.c:2557)
 r10:00000128 r9:84664680 r8:00000000 r7:00000000 r6:85244f00 r5:ed385f30
 r4:00000000
[<8131008c>] (___sys_sendmsg) from [<81310554>] (__sys_sendmsg net/socket.c:2586 [inline])
[<8131008c>] (___sys_sendmsg) from [<81310554>] (__do_sys_sendmsg net/socket.c:2595 [inline])
[<8131008c>] (___sys_sendmsg) from [<81310554>] (sys_sendmsg+0x58/0xa0 net/socket.c:2593)
 r8:80200288 r7:00000128 r6:00000000 r5:20002ac0 r4:85244f00
[<813104fc>] (sys_sendmsg) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:66)
Exception stack(0xed385fa8 to 0xed385ff0)
5fa0:                   00000000 00000000 00000003 20002ac0 00000000 00000000
5fc0: 00000000 00000000 0014c2b8 00000128 7eb4e3c2 76b526d0 7eb4e534 76b5220c
5fe0: 76b52020 76b52010 00017004 0004dfb0
 r6:0014c2b8 r5:00000000 r4:00000000
Rebooting in 86400 seconds..