------------[ cut here ]------------
len > ((int)(~0U >> 1))
WARNING: ./include/linux/skbuff.h:2865 at pskb_may_pull_reason include/linux/skbuff.h:2865 [inline], CPU#1: syz.0.125/6264
WARNING: ./include/linux/skbuff.h:2865 at pskb_may_pull include/linux/skbuff.h:2883 [inline], CPU#1: syz.0.125/6264
WARNING: ./include/linux/skbuff.h:2865 at qdisc_pkt_len_segs_init+0x4c1/0xa30 net/core/dev.c:4136, CPU#1: syz.0.125/6264
Modules linked in:
CPU: 1 UID: 0 PID: 6264 Comm: syz.0.125 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:2865 [inline]
RIP: 0010:pskb_may_pull include/linux/skbuff.h:2883 [inline]
RIP: 0010:qdisc_pkt_len_segs_init+0x4c1/0xa30 net/core/dev.c:4136
Code: 81 e6 00 00 02 00 31 ff e8 6c ec 49 f8 41 81 e6 00 00 02 00 0f 85 fb 00 00 00 e8 1a e8 49 f8 e9 5b 01 00 00 e8 10 e8 49 f8 90 <0f> 0b 90 e9 e8 fd ff ff 44 89 e7 44 89 f6 e8 bc e9 49 f8 45 39 f4
RSP: 0018:ffffc90000a085d0 EFLAGS: 00010246
RAX: ffffffff897bce90 RBX: 1ffff1100ecb7d33 RCX: ffff88801dfc0000
RDX: 0000000000000100 RSI: 00000000fffffffa RDI: 0000000000000000
RBP: ffff8880765be8c0 R08: ffff88807e580067 R09: 1ffff1100fcb000c
R10: dffffc0000000000 R11: ffffed100fcb000d R12: 00000000fffffffa
R13: dffffc0000000000 R14: 0000000000000003 R15: ffff888058e99858
FS:  0000000000000000(0000) GS:ffff88812539c000(0063) knlGS:00000000f53cdb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000080010000 CR3: 0000000075ef4000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 sch_handle_ingress net/core/dev.c:4477 [inline]
 __netif_receive_skb_core+0x13bd/0x3170 net/core/dev.c:6053
 __netif_receive_skb_list_core+0x24d/0x810 net/core/dev.c:6277
 __netif_receive_skb_list net/core/dev.c:6344 [inline]
 netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6435
 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:6803
 gro_cell_poll+0x5a9/0x5d0 net/core/gro_cells.c:74
 __napi_poll+0xae/0x340 net/core/dev.c:7733
 napi_poll net/core/dev.c:7796 [inline]
 net_rx_action+0x627/0xf70 net/core/dev.c:7953
 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:1955
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:2001
 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_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
 __do_fast_syscall_32+0x23e/0x6f0 arch/x86/entry/syscall_32.c:307
 do_fast_syscall_32+0x33/0x70 arch/x86/entry/syscall_32.c:332
 entry_SYSENTER_compat_after_hwframe+0x84/0x8e
RIP: 0023:0xf6fdf01c
Code: 90 85 d2 74 0a 89 ce 81 e6 ff 0f 00 00 89 32 85 c0 74 05 c1 e9 0c 89 08 31 c0 5e 5d c3 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 58 b8
RSP: 002b:00000000f53cd50c EFLAGS: 00000206 ORIG_RAX: 0000000000000004
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000800002c0
RDX: 000000000000fdef RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	85 d2                	test   %edx,%edx
   3:	74 0a                	je     0xf
   5:	89 ce                	mov    %ecx,%esi
   7:	81 e6 ff 0f 00 00    	and    $0xfff,%esi
   d:	89 32                	mov    %esi,(%rdx)
   f:	85 c0                	test   %eax,%eax
  11:	74 05                	je     0x18
  13:	c1 e9 0c             	shr    $0xc,%ecx
  16:	89 08                	mov    %ecx,(%rax)
  18:	31 c0                	xor    %eax,%eax
  1a:	5e                   	pop    %rsi
  1b:	5d                   	pop    %rbp
  1c:	c3                   	ret
  1d:	90                   	nop
  1e:	0f 1f 00             	nopl   (%rax)
  21:	51                   	push   %rcx
  22:	52                   	push   %rdx
  23:	55                   	push   %rbp
  24:	89 e5                	mov    %esp,%ebp
  26:	0f 34                	sysenter
  28:	cd 80                	int    $0x80
* 2a:	5d                   	pop    %rbp <-- trapping instruction
  2b:	5a                   	pop    %rdx
  2c:	59                   	pop    %rcx
  2d:	c3                   	ret
  2e:	90                   	nop
  2f:	90                   	nop
  30:	90                   	nop
  31:	90                   	nop
  32:	90                   	nop
  33:	90                   	nop
  34:	90                   	nop
  35:	90                   	nop
  36:	90                   	nop
  37:	90                   	nop
  38:	90                   	nop
  39:	90                   	nop
  3a:	90                   	nop
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	58                   	pop    %rax
  3f:	b8                   	.byte 0xb8