------------[ cut here ]------------
len > ((int)(~0U >> 1))
WARNING: ./include/linux/skbuff.h:2864 at pskb_may_pull_reason include/linux/skbuff.h:2864 [inline], CPU#1: syz.4.2463/15558
WARNING: ./include/linux/skbuff.h:2864 at pskb_network_may_pull_reason include/linux/skbuff.h:3294 [inline], CPU#1: syz.4.2463/15558
WARNING: ./include/linux/skbuff.h:2864 at pskb_inet_may_pull_reason include/net/ip_tunnels.h:480 [inline], CPU#1: syz.4.2463/15558
WARNING: ./include/linux/skbuff.h:2864 at pskb_inet_may_pull include/net/ip_tunnels.h:485 [inline], CPU#1: syz.4.2463/15558
WARNING: ./include/linux/skbuff.h:2864 at ipip_tunnel_xmit+0x330/0x4c0 net/ipv4/ipip.c:289, CPU#1: syz.4.2463/15558
Modules linked in:
CPU: 1 UID: 0 PID: 15558 Comm: syz.4.2463 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pskb_may_pull_reason include/linux/skbuff.h:2864 [inline]
RIP: 0010:pskb_network_may_pull_reason include/linux/skbuff.h:3294 [inline]
RIP: 0010:pskb_inet_may_pull_reason include/net/ip_tunnels.h:480 [inline]
RIP: 0010:pskb_inet_may_pull include/net/ip_tunnels.h:485 [inline]
RIP: 0010:ipip_tunnel_xmit+0x330/0x4c0 net/ipv4/ipip.c:289
Code: ff ff ff 4d 8d bd 4c 0f 00 00 e8 0b b8 5b f7 4c 89 f7 4c 89 ee 4c 89 fa 89 e9 e8 fb b5 fc ff e9 28 ff ff ff e8 f1 b7 5b f7 90 <0f> 0b 90 e9 cc fd ff ff 44 89 e7 44 89 fe e8 ed b9 5b f7 45 39 fc
RSP: 0018:ffffc9000d76f298 EFLAGS: 00010287
RAX: ffffffff8a6c1a8f RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc9000dbf1000 RSI: 00000000000003d3 RDI: 00000000000003d4
RBP: 0000000000000000 R08: ffff8880293e3e80 R09: 0000000000000002
R10: 0000000000004888 R11: ffffffff8a6c1760 R12: 00000000ffffff40
R13: ffff8880778b7ad8 R14: ffff8880778b7a00 R15: 0000000000000000
FS:  00007fa3e08c96c0(0000) GS:ffff888124dce000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff6a81ed158 CR3: 0000000076ca0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __netdev_start_xmit include/linux/netdevice.h:5429 [inline]
 netdev_start_xmit include/linux/netdevice.h:5438 [inline]
 __dev_direct_xmit+0x4b6/0x730 net/core/dev.c:4990
 __xsk_generic_xmit net/xdp/xsk.c:1280 [inline]
 xsk_generic_xmit+0x272b/0x4730 net/xdp/xsk.c:1336
 xsk_poll+0x326/0x670 net/xdp/xsk.c:1464
 sock_poll+0x338/0x3f0 net/socket.c:1514
 vfs_poll include/linux/poll.h:82 [inline]
 select_poll_one fs/select.c:480 [inline]
 do_select+0x1067/0x17f0 fs/select.c:536
 core_sys_select+0x86d/0xb40 fs/select.c:677
 do_pselect fs/select.c:770 [inline]
 __do_sys_pselect6 fs/select.c:809 [inline]
 __se_sys_pselect6+0x267/0x320 fs/select.c:800
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa3df99e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fa3e08c9028 EFLAGS: 00000246 ORIG_RAX: 000000000000010e
RAX: ffffffffffffffda RBX: 00007fa3dfc25fa0 RCX: 00007fa3df99e159
RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 0000000000000040
RBP: 00007fa3dfa3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000040 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa3dfc26038 R14: 00007fa3dfc25fa0 R15: 00007ffd18b23828
 </TASK>