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 (1569) > skb_headlen() (1305) WARNING: CPU: 0 PID: 3202 at net/core/dev.c:3302 skb_checksum_help+0x404/0x64c net/core/dev.c:3302 Modules linked in: CPU: 0 PID: 3202 Comm: syz-executor264 Not tainted 6.7.0-syzkaller-09928-g052d534373b7 #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:3302 lr : skb_checksum_help+0x404/0x64c net/core/dev.c:3302 sp : ffff800089d26ab0 x29: ffff800089d26ab0 x28: ffff000014e52074 x27: 1fffe000029ca40e x26: 0000000000000007 x25: 0000000000005653 x24: 000000000000061f x23: 1fffe000029ca41a x22: 000000000000061f x21: ffff000014e520d0 x20: 0000000000000586 x19: ffff000014e52000 x18: 0000000000000014 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000000 x13: 205d323032335420 x12: ffff60000d5125f3 x11: 1fffe0000d5125f2 x10: ffff60000d5125f2 x9 : dfff800000000000 x8 : 00009ffff2aeda0e x7 : ffff00006a892f93 x6 : 0000000000000001 x5 : ffff00006a892f90 x4 : 1fffe00002965b29 x3 : dfff800000000000 x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff000014b2d940 Call trace: skb_checksum_help+0x404/0x64c net/core/dev.c:3302 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:451 [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+0x1324/0x2360 net/ipv4/ip_tunnel.c:831 __gre_xmit+0x4a0/0x8ac net/ipv4/ip_gre.c:469 ipgre_xmit+0x330/0x80c net/ipv4/ip_gre.c:665 __netdev_start_xmit include/linux/netdevice.h:4989 [inline] netdev_start_xmit include/linux/netdevice.h:5003 [inline] xmit_one net/core/dev.c:3547 [inline] dev_hard_start_xmit+0x198/0x6cc net/core/dev.c:3563 __dev_queue_xmit+0x62c/0x3110 net/core/dev.c:4351 dev_queue_xmit include/linux/netdevice.h:3171 [inline] packet_xmit+0x200/0x314 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3081 [inline] packet_sendmsg+0x18b0/0x3e50 net/packet/af_packet.c:3113 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xc8/0x168 net/socket.c:745 ____sys_sendmsg+0x550/0x6e0 net/socket.c:2584 ___sys_sendmsg+0x11c/0x19c net/socket.c:2638 __sys_sendmsg+0xe0/0x174 net/socket.c:2667 __do_sys_sendmsg net/socket.c:2676 [inline] __se_sys_sendmsg net/socket.c:2674 [inline] __arm64_sys_sendmsg+0x70/0xa0 net/socket.c:2674 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x6c/0x258 arch/arm64/kernel/syscall.c:51 el0_svc_common.constprop.0+0xac/0x230 arch/arm64/kernel/syscall.c:136 do_el0_svc+0x40/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x58/0x140 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:595 irq event stamp: 0 hardirqs last enabled at (0): [<0000000000000000>] 0x0 hardirqs last disabled at (0): [] copy_process+0x1404/0x5034 kernel/fork.c:2437 softirqs last enabled at (0): [] copy_process+0x1444/0x5034 kernel/fork.c:2441 softirqs last disabled at (0): [<0000000000000000>] 0x0 ---[ end trace 0000000000000000 ]---