skb linear: 00000110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 skb linear: 00000120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ------------[ cut here ]------------ offset+2 (13608) > skb_headlen() (10605) WARNING: CPU: 0 PID: 6999 at net/core/dev.c:3334 skb_checksum_help+0x5c4/0x644 Modules linked in: CPU: 0 PID: 6999 Comm: syz.0.83 Not tainted 6.10.0-rc7-syzkaller-gc912bf709078 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : skb_checksum_help+0x5c4/0x644 lr : skb_checksum_help+0x5c0/0x644 net/core/dev.c:3333 sp : ffff80009d3069e0 x29: ffff80009d306a00 x28: 0000000000003526 x27: dfff800000000000 x26: 000000000000296d x25: 0000000000007a23 x24: 0000000000003528 x23: ffff0000d8f4cd58 x22: ffff0000d8f4ccf0 x21: ffff0000d8f4cc80 x20: 00000000ffffffea x19: 000000000000296d x18: 0000000000000008 x17: 3020303020303020 x16: ffff800082f95f34 x15: 0000000000000001 x14: 1fffe000367a3e4a x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000040000 x10: 0000000000009fee x9 : c7e3380a6fbd0700 x8 : c7e3380a6fbd0700 x7 : ffff80008036d944 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 0000000000000001 x3 : ffff8000805e5ef0 x2 : 0000000000000001 x1 : 0000000000000200 x0 : 0000000000000000 Call trace: skb_checksum_help+0x5c4/0x644 ip_do_fragment+0x1cc/0x1b38 net/ipv4/ip_output.c:777 ip_fragment+0x11c/0x304 ip_finish_output_gso net/ipv4/ip_output.c:286 [inline] __ip_finish_output+0x280/0x458 net/ipv4/ip_output.c:308 ip_finish_output+0x44/0x2e4 net/ipv4/ip_output.c:323 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0x1a8/0x21c net/ipv4/ip_output.c:433 dst_output include/net/dst.h:450 [inline] ip_local_out+0x120/0x160 net/ipv4/ip_output.c:129 iptunnel_xmit+0x428/0x940 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x16d4/0x261c net/ipv4/ip_tunnel.c:857 __gre_xmit net/ipv4/ip_gre.c:483 [inline] ipgre_xmit+0x774/0xb34 net/ipv4/ip_gre.c:687 __netdev_start_xmit include/linux/netdevice.h:4882 [inline] netdev_start_xmit include/linux/netdevice.h:4896 [inline] xmit_one net/core/dev.c:3578 [inline] dev_hard_start_xmit+0x260/0x904 net/core/dev.c:3594 __dev_queue_xmit+0x1670/0x33f4 net/core/dev.c:4393 dev_queue_xmit include/linux/netdevice.h:3095 [inline] packet_xmit+0x6c/0x314 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3080 [inline] packet_sendmsg+0x3788/0x4c9c net/packet/af_packet.c:3112 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x4d8/0x77c net/socket.c:2585 ___sys_sendmsg net/socket.c:2639 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2668 __do_sys_sendmsg net/socket.c:2677 [inline] __se_sys_sendmsg net/socket.c:2675 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2675 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:131 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:150 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 irq event stamp: 583 hardirqs last enabled at (582): [] console_trylock_spinning+0x27c/0x3d8 kernel/printk/printk.c:1992 hardirqs last disabled at (583): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:470 softirqs last enabled at (252): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (354): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]---