skb linear: 000000b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 skb linear: 000000c0: 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: 1 PID: 6465 at net/core/dev.c:3333 skb_checksum_help+0x404/0x64c net/core/dev.c:3333 Modules linked in: CPU: 1 PID: 6465 Comm: syz-executor.1 Tainted: G W 6.10.0-rc1-syzkaller-00027-g4a4be1ad3a6e #0 Hardware name: linux,dummy-virt (DT) pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : skb_checksum_help+0x404/0x64c net/core/dev.c:3333 lr : skb_checksum_help+0x404/0x64c net/core/dev.c:3333 sp : ffff80008c296a70 x29: ffff80008c296a70 x28: ffff00000e897074 x27: 1fffe00001d12e0e x26: 0000000000000007 x25: 000000000000d56e x24: 0000000000009e73 x23: 1fffe00001d12e1a x22: 0000000000009e73 x21: ffff00000e8970d0 x20: 0000000000000673 x19: ffff00000e897000 x18: ffff00000a266480 x17: 0000000000000000 x16: 0000000000000006 x15: 1fffe0000144cc8f x14: 0000000000000000 x13: 0000000000000004 x12: ffff60000d4cf403 x11: 1fffe0000d4cf402 x10: ffff60000d4cf402 x9 : dfff800000000000 x8 : ffff00006a67a013 x7 : 0000000000000001 x6 : ffff60000d4cf402 x5 : ffff00006a67a010 x4 : 1fffe0000144cb41 x3 : dfff800000000000 x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00000a265a00 Call trace: skb_checksum_help+0x404/0x64c net/core/dev.c:3333 ip_do_fragment+0x8a4/0x1860 net/ipv4/ip_output.c:777 ip_fragment.constprop.0+0x108/0x2ac net/ipv4/ip_output.c:584 ip_finish_output_gso net/ipv4/ip_output.c:286 [inline] __ip_finish_output net/ipv4/ip_output.c:308 [inline] __ip_finish_output+0x380/0x4e0 net/ipv4/ip_output.c:295 ip_finish_output+0x34/0x278 net/ipv4/ip_output.c:323 NF_HOOK_COND include/linux/netfilter.h:303 [inline] ip_output+0x144/0x400 net/ipv4/ip_output.c:433 dst_output include/net/dst.h:450 [inline] ip_local_out+0x80/0x130 net/ipv4/ip_output.c:129 iptunnel_xmit+0x4e0/0x94c net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x12b0/0x232c net/ipv4/ip_tunnel.c:857 __gre_xmit+0x490/0x86c net/ipv4/ip_gre.c:483 ipgre_xmit+0x39c/0xa88 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+0x1a4/0x714 net/core/dev.c:3594 __dev_queue_xmit+0x628/0x33f4 net/core/dev.c:4393 dev_queue_xmit include/linux/netdevice.h:3095 [inline] packet_xmit+0x200/0x314 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3080 [inline] packet_sendmsg+0x18b4/0x3e54 net/packet/af_packet.c:3112 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xc8/0x168 net/socket.c:745 ____sys_sendmsg+0x550/0x6e0 net/socket.c:2585 ___sys_sendmsg+0x11c/0x19c net/socket.c:2639 __sys_sendmsg+0xe0/0x174 net/socket.c:2668 __compat_sys_sendmsg net/compat.c:346 [inline] __do_compat_sys_sendmsg net/compat.c:353 [inline] __se_compat_sys_sendmsg net/compat.c:350 [inline] __arm64_compat_sys_sendmsg+0x74/0xa4 net/compat.c:350 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x6c/0x25c arch/arm64/kernel/syscall.c:48 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:133 do_el0_svc_compat+0x40/0x64 arch/arm64/kernel/syscall.c:158 el0_svc_compat+0x4c/0x17c arch/arm64/kernel/entry-common.c:852 el0t_32_sync_handler+0x98/0x13c arch/arm64/kernel/entry-common.c:862 el0t_32_sync+0x194/0x198 arch/arm64/kernel/entry.S:603 irq event stamp: 785 hardirqs last enabled at (784): [] __up_console_sem kernel/printk/printk.c:341 [inline] hardirqs last enabled at (784): [] __console_unlock kernel/printk/printk.c:2746 [inline] hardirqs last enabled at (784): [] console_unlock+0x1c0/0x1d8 kernel/printk/printk.c:3065 hardirqs last disabled at (785): [] el1_dbg+0x24/0x9c arch/arm64/kernel/entry-common.c:470 softirqs last enabled at (356): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (356): [] handle_softirqs+0x8a8/0xd80 kernel/softirq.c:582 softirqs last disabled at (452): [] __dev_queue_xmit+0x1d8/0x33f4 net/core/dev.c:4312 ---[ end trace 0000000000000000 ]---