------------[ cut here ]------------
len > ((int)(~0U >> 1))
WARNING: ./include/linux/skbuff.h:2864 at pskb_may_pull_reason include/linux/skbuff.h:2864 [inline], CPU#0: syz.0.17/5901
WARNING: ./include/linux/skbuff.h:2864 at pskb_network_may_pull_reason include/linux/skbuff.h:3294 [inline], CPU#0: syz.0.17/5901
WARNING: ./include/linux/skbuff.h:2864 at pskb_inet_may_pull_reason include/net/ip_tunnels.h:480 [inline], CPU#0: syz.0.17/5901
WARNING: ./include/linux/skbuff.h:2864 at pskb_inet_may_pull include/net/ip_tunnels.h:485 [inline], CPU#0: syz.0.17/5901
WARNING: ./include/linux/skbuff.h:2864 at ip6_tnl_start_xmit+0xab8/0x1760 net/ipv6/ip6_tunnel.c:1434, CPU#0: syz.0.17/5901
Modules linked in:
CPU: 0 UID: 0 PID: 5901 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
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:ip6_tnl_start_xmit+0xab8/0x1760 net/ipv6/ip6_tunnel.c:1434
Code: 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 2a 0b 00 00 41 8b 84 24 38 0f 00 00 89 85 d8 fe ff ff e9 0e fa ff ff e8 29 f3 72 f7 90 <0f> 0b 90 e9 ec f6 ff ff e8 1b f3 72 f7 44 8b b5 e8 fe ff ff 44 89
RSP: 0018:ffffc90028897290 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff888033b5af00 RCX: 0000000000000200
RDX: ffff8880227f0000 RSI: ffffffff8a991de7 RDI: ffff8880227f0000
RBP: ffffc900288973d8 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000ffffffc0 R11: 0000000000000000 R12: ffff88801d7de000
R13: 00000000ffffffc0 R14: 0000000000000000 R15: ffffffffffffffc0
FS:  00007f0ea9f4e6c0(0000) GS:ffff8880d5b5d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0ea9f4dff8 CR3: 00000000355f0000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __netdev_start_xmit include/linux/netdevice.h:5429 [inline]
 netdev_start_xmit include/linux/netdevice.h:5438 [inline]
 __dev_direct_xmit+0x5b3/0x750 net/core/dev.c:4990
 __xsk_generic_xmit net/xdp/xsk.c:1280 [inline]
 xsk_generic_xmit+0x2267/0x44a0 net/xdp/xsk.c:1336
 xsk_poll+0x2a5/0x840 net/xdp/xsk.c:1464
 sock_poll+0x160/0x510 net/socket.c:1514
 vfs_poll include/linux/poll.h:82 [inline]
 select_poll_one fs/select.c:480 [inline]
 do_select+0xd54/0x1850 fs/select.c:536
 core_sys_select+0x55b/0xbb0 fs/select.c:677
 do_pselect.constprop.0+0x238/0x270 fs/select.c:770
 __do_sys_pselect6 fs/select.c:809 [inline]
 __se_sys_pselect6 fs/select.c:800 [inline]
 __x64_sys_pselect6+0x149/0x1c0 fs/select.c:800
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0ea8f9e159
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:00007f0ea9f4e028 EFLAGS: 00000246 ORIG_RAX: 000000000000010e
RAX: ffffffffffffffda RBX: 00007f0ea9225fa0 RCX: 00007f0ea8f9e159
RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 0000000000000040
RBP: 00007f0ea9035024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000200000000040 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0ea9226038 R14: 00007f0ea9225fa0 R15: 00007ffc68077bf8
 </TASK>