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 (40565) > skb_headlen() (1651) WARNING: CPU: 0 PID: 6237 at net/core/dev.c:3287 skb_checksum_help+0x5c4/0x644 Modules linked in: CPU: 0 PID: 6237 Comm: syz-executor244 Not tainted 6.9.0-rc6-syzkaller-g78186bd77b47 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 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:3286 sp : ffff800097cf6a60 x29: ffff800097cf6a80 x28: 0000000000009e73 x27: dfff800000000000 x26: 0000000000000673 x25: 000000000000d56e x24: 0000000000009e75 x23: ffff0000d8b1e718 x22: ffff0000d8b1e6b0 x21: ffff0000d8b1e640 x20: 00000000ffffffea x19: 0000000000000673 x18: 0000000000000008 x17: 0000000000000000 x16: ffff80008ae8863c x15: 0000000000000001 x14: 1fffe000367b8e02 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000202 x10: 0000000000ff0100 x9 : df314cf183975200 x8 : df314cf183975200 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800097cf61d8 x4 : ffff80008ef850a0 x3 : ffff8000805e8270 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+0x16cc/0x2630 net/ipv4/ip_tunnel.c:857 __gre_xmit net/ipv4/ip_gre.c:474 [inline] ipgre_xmit+0x6b4/0xa74 net/ipv4/ip_gre.c:670 __netdev_start_xmit include/linux/netdevice.h:4903 [inline] netdev_start_xmit include/linux/netdevice.h:4917 [inline] xmit_one net/core/dev.c:3531 [inline] dev_hard_start_xmit+0x27c/0x938 net/core/dev.c:3547 __dev_queue_xmit+0x1678/0x33fc net/core/dev.c:4341 dev_queue_xmit include/linux/netdevice.h:3091 [inline] packet_xmit+0x6c/0x31c net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3081 [inline] packet_sendmsg+0x3788/0x4c9c net/packet/af_packet.c:3113 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:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 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: 118681 hardirqs last enabled at (118680): [] __up_console_sem kernel/printk/printk.c:341 [inline] hardirqs last enabled at (118680): [] __console_unlock kernel/printk/printk.c:2731 [inline] hardirqs last enabled at (118680): [] console_unlock+0x17c/0x3d4 kernel/printk/printk.c:3050 hardirqs last disabled at (118681): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:470 softirqs last enabled at (118192): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (118192): [] release_sock+0x154/0x1b8 net/core/sock.c:3559 softirqs last disabled at (118298): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]---