------------[ cut here ]------------ WARNING: CPU: 0 PID: 4595 at net/core/dev.c:3263 skb_checksum_help+0x32c/0x4a0 Modules linked in: CPU: 0 PID: 4595 Comm: syz.1.179 Not tainted 5.15.161-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : skb_checksum_help+0x32c/0x4a0 lr : skb_checksum_help+0x328/0x4a0 net/core/dev.c:3263 sp : ffff80001a176aa0 x29: ffff80001a176ac0 x28: 0000000000002989 x27: 1fffe000184c78d6 x26: dfff800000000000 x25: 0000000000002989 x24: 0000000000002989 x23: ffff0000c263c6b0 x22: 1fffe000184c78d6 x21: ffff0000c263c6b4 x20: 00000000ffffffea x19: ffff0000c263c6c0 x18: 0000000000000200 x17: 0000000000000002 x16: ffff8000084c48d0 x15: 0000000000000003 x14: ffff0000db043680 x13: 0000000000ff0100 x12: 0000000000040000 x11: 00000000000094b6 x10: ffff80001d59a000 x9 : 00000000000094b7 x8 : ffff80000fdd341c x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000020 x2 : 0000000000000000 x1 : 0000000000002989 x0 : 0000000000002989 Call trace: skb_checksum_help+0x32c/0x4a0 ip_do_fragment+0x198/0x199c net/ipv4/ip_output.c:774 ip_fragment+0x11c/0x308 __ip_finish_output+0x378/0x458 net/ipv4/ip_output.c:304 ip_finish_output+0x40/0x218 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip_output+0x330/0x49c net/ipv4/ip_output.c:430 dst_output include/net/dst.h:443 [inline] ip_local_out+0x120/0x160 net/ipv4/ip_output.c:126 iptunnel_xmit+0x40c/0x8fc net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x1acc/0x2334 net/ipv4/ip_tunnel.c:837 __gre_xmit net/ipv4/ip_gre.c:474 [inline] ipgre_xmit+0x690/0xa2c net/ipv4/ip_gre.c:669 __netdev_start_xmit include/linux/netdevice.h:5019 [inline] netdev_start_xmit include/linux/netdevice.h:5033 [inline] xmit_one net/core/dev.c:3617 [inline] dev_hard_start_xmit+0x2bc/0x92c net/core/dev.c:3633 __dev_queue_xmit+0x13a8/0x2a6c net/core/dev.c:4248 dev_queue_xmit+0x24/0x34 net/core/dev.c:4281 packet_snd net/packet/af_packet.c:3038 [inline] packet_sendmsg+0x3654/0x4c68 net/packet/af_packet.c:3069 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x584/0x870 net/socket.c:2431 ___sys_sendmsg+0x214/0x294 net/socket.c:2485 __sys_sendmsg net/socket.c:2514 [inline] __do_sys_sendmsg net/socket.c:2523 [inline] __se_sys_sendmsg net/socket.c:2521 [inline] __arm64_sys_sendmsg+0x1ac/0x25c net/socket.c:2521 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 irq event stamp: 1511 hardirqs last enabled at (1510): [] __local_bh_enable_ip+0x230/0x470 kernel/softirq.c:388 hardirqs last disabled at (1511): [] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:396 softirqs last enabled at (1286): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:31 softirqs last disabled at (1410): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:18 ---[ end trace ed09b5f10420069b ]---