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 (4649) > skb_headlen() (4085) WARNING: CPU: 0 PID: 7024 at net/core/dev.c:3304 skb_checksum_help+0x5c4/0x644 Modules linked in: CPU: 0 PID: 7024 Comm: syz-executor.1 Not tainted 6.7.0-rc6-syzkaller-gaafe7ad77b91 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 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:3303 sp : ffff80009aa06a80 x29: ffff80009aa06aa0 x28: 0000000000001227 x27: dfff800000000000 x26: 0000000000000ff5 x25: 0000000000000000 x24: 0000000000001229 x23: ffff0000c305c0d8 x22: ffff0000c305c070 x21: ffff0000c305c000 x20: 00000000ffffffea x19: 0000000000000ff5 x18: ffff80009aa05ee0 x17: 0000000000000000 x16: ffff80008a776f40 x15: 0000000000000001 x14: 1ffff00013540c6c x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000040000 x10: 000000000001c16a x9 : 4f5dafbb46705800 x8 : 4f5dafbb46705800 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff80009aa06378 x4 : ffff80008e5d20c0 x3 : ffff800080365488 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_mc_output+0x3e8/0x508 net/ipv4/ip_output.c:420 dst_output include/net/dst.h:451 [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+0x16cc/0x2654 net/ipv4/ip_tunnel.c:831 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x688/0xa30 net/ipv4/ip_gre.c:665 __netdev_start_xmit include/linux/netdevice.h:4940 [inline] netdev_start_xmit include/linux/netdevice.h:4954 [inline] xmit_one net/core/dev.c:3545 [inline] dev_hard_start_xmit+0x240/0x8ac net/core/dev.c:3561 __dev_queue_xmit+0x1570/0x31d8 net/core/dev.c:4346 dev_queue_xmit include/linux/netdevice.h:3134 [inline] packet_xmit+0x6c/0x318 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3087 [inline] packet_sendmsg+0x3784/0x4ca8 net/packet/af_packet.c:3119 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x56c/0x840 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2674 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 irq event stamp: 1319 hardirqs last enabled at (1318): [] __up_console_sem kernel/printk/printk.c:341 [inline] hardirqs last enabled at (1318): [] __console_unlock kernel/printk/printk.c:2706 [inline] hardirqs last enabled at (1318): [] console_unlock+0x17c/0x3d4 kernel/printk/printk.c:3038 hardirqs last disabled at (1319): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:436 softirqs last enabled at (262): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (368): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]---