skb frag: 000000a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 skb frag: 000000b0: 00 00 00 00 ------------[ cut here ]------------ offset+2 (1321) > skb_headlen() (124) WARNING: CPU: 0 PID: 6090 at net/core/dev.c:3332 skb_checksum_help+0x5c4/0x644 Modules linked in: CPU: 0 PID: 6090 Comm: syz-executor100 Not tainted 6.6.0-rc7-syzkaller-g8de1e7afcc1c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 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:3331 sp : ffff800096ba6ac0 x29: ffff800096ba6ae0 x28: 0000000000000527 x27: dfff800000000000 x26: 000000000000007c x25: 0000000025002a07 x24: 0000000000000529 x23: ffff0000db664498 x22: ffff0000db664430 x21: ffff0000db6643c0 x20: 00000000ffffffea x19: 00000000000006f5 x18: ffff800096ba5f40 x17: 0000000000000000 x16: ffff80008a71b23c x15: 0000000000000001 x14: 1fffe0003682f032 x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000200 x10: 0000000000000000 x9 : c65ad1b74c0f6400 x8 : c65ad1b74c0f6400 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff800096ba63b8 x4 : ffff80008e4210a0 x3 : ffff8000805a359c x2 : 0000000000000001 x1 : 0000000000000200 x0 : 0000000000000000 Call trace: skb_checksum_help+0x5c4/0x644 ip_do_fragment+0x1cc/0x1b38 net/ipv4/ip_output.c:775 ip_fragment+0x11c/0x304 ip_finish_output_gso net/ipv4/ip_output.c:284 [inline] __ip_finish_output+0x280/0x458 net/ipv4/ip_output.c:306 ip_finish_output+0x44/0x2e4 net/ipv4/ip_output.c:321 NF_HOOK_COND include/linux/netfilter.h:293 [inline] ip_mc_output+0x3e8/0x508 net/ipv4/ip_output.c:418 dst_output include/net/dst.h:458 [inline] ip_local_out+0x120/0x160 net/ipv4/ip_output.c:127 iptunnel_xmit+0x424/0x93c net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x16ac/0x2634 net/ipv4/ip_tunnel.c:831 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x5d4/0x8e0 net/ipv4/ip_gre.c:662 __netdev_start_xmit include/linux/netdevice.h:4889 [inline] netdev_start_xmit include/linux/netdevice.h:4903 [inline] xmit_one net/core/dev.c:3573 [inline] dev_hard_start_xmit+0x240/0x8ac net/core/dev.c:3589 __dev_queue_xmit+0x1650/0x32c0 net/core/dev.c:4369 dev_queue_xmit include/linux/netdevice.h:3082 [inline] packet_xmit+0x6c/0x318 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3087 [inline] packet_sendmsg+0x3784/0x4ca0 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:2558 ___sys_sendmsg net/socket.c:2612 [inline] __sys_sendmsg+0x26c/0x33c net/socket.c:2641 __do_sys_sendmsg net/socket.c:2650 [inline] __se_sys_sendmsg net/socket.c:2648 [inline] __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2648 __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: 122375 hardirqs last enabled at (122374): [] __up_console_sem kernel/printk/printk.c:347 [inline] hardirqs last enabled at (122374): [] __console_unlock kernel/printk/printk.c:2718 [inline] hardirqs last enabled at (122374): [] console_unlock+0x17c/0x3d4 kernel/printk/printk.c:3037 hardirqs last disabled at (122375): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:436 softirqs last enabled at (121906): [] spin_unlock_bh include/linux/spinlock.h:396 [inline] softirqs last enabled at (121906): [] release_sock+0x15c/0x1b0 net/core/sock.c:3531 softirqs last disabled at (121938): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]---