------------[ 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.2.1646/11589
WARNING: ./include/linux/skbuff.h:2864 at pskb_may_pull include/linux/skbuff.h:2882 [inline], CPU#1: syz.2.1646/11589
WARNING: ./include/linux/skbuff.h:2864 at qdisc_pkt_len_segs_init+0x4c1/0xa30 net/core/dev.c:4137, CPU#1: syz.2.1646/11589
Modules linked in:
CPU: 1 UID: 0 PID: 11589 Comm: syz.2.1646 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:pskb_may_pull_reason include/linux/skbuff.h:2864 [inline]
RIP: 0010:pskb_may_pull include/linux/skbuff.h:2882 [inline]
RIP: 0010:qdisc_pkt_len_segs_init+0x4c1/0xa30 net/core/dev.c:4137
Code: 81 e6 00 00 02 00 31 ff e8 ac ab 47 f8 41 81 e6 00 00 02 00 0f 85 fb 00 00 00 e8 5a a7 47 f8 e9 5b 01 00 00 e8 50 a7 47 f8 90 <0f> 0b 90 e9 e8 fd ff ff 44 89 e7 44 89 f6 e8 fc a8 47 f8 45 39 f4
RSP: 0018:ffffc90000a085d0 EFLAGS: 00010246
RAX: ffffffff897e1d70 RBX: 1ffff1100b27670b RCX: ffff88805ab7bd80
RDX: 0000000000000100 RSI: 00000000fffffffe RDI: 0000000000000000
RBP: ffff8880593b3780 R08: ffff888035132067 R09: 1ffff11006a2640c
R10: dffffc0000000000 R11: ffffed1006a2640d R12: 00000000fffffffe
R13: dffffc0000000000 R14: 0000000000000003 R15: ffff8880590cf8d8
FS:  00007f83c23206c0(0000) GS:ffff888125376000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000101 CR3: 0000000027600000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 sch_handle_ingress net/core/dev.c:4478 [inline]
 __netif_receive_skb_core+0x13bd/0x3170 net/core/dev.c:6054
 __netif_receive_skb_list_core+0x24d/0x810 net/core/dev.c:6278
 __netif_receive_skb_list net/core/dev.c:6345 [inline]
 netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6436
 gro_normal_list include/net/gro.h:523 [inline]
 gro_flush_normal include/net/gro.h:531 [inline]
 napi_complete_done+0x299/0x730 net/core/dev.c:6804
 gro_cell_poll+0x5a9/0x5d0 net/core/gro_cells.c:74
 __napi_poll+0xae/0x340 net/core/dev.c:7734
 napi_poll net/core/dev.c:7797 [inline]
 net_rx_action+0x627/0xf70 net/core/dev.c:7954
 handle_softirqs+0x22a/0x840 kernel/softirq.c:622
 do_softirq+0x76/0xd0 kernel/softirq.c:523
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 tun_rx_batched+0x617/0x790 drivers/net/tun.c:-1
 tun_get_user+0x2bbc/0x43e0 drivers/net/tun.c:1986
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:2032
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:688
 ksys_write+0x150/0x270 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f83c139ce59
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:00007f83c2320028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f83c1615fa0 RCX: 00007f83c139ce59
RDX: 000000000000007a RSI: 00002000000004c0 RDI: 0000000000000005
RBP: 00007f83c1432d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f83c1616038 R14: 00007f83c1615fa0 R15: 00007ffe23cdbf38
 </TASK>