------------[ 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.1.295/6997
WARNING: ./include/linux/skbuff.h:2864 at pskb_may_pull include/linux/skbuff.h:2882 [inline], CPU#0: syz.1.295/6997
WARNING: ./include/linux/skbuff.h:2864 at qdisc_pkt_len_segs_init+0x4b4/0xa30 net/core/dev.c:4189, CPU#0: syz.1.295/6997
Modules linked in:
CPU: 0 UID: 0 PID: 6997 Comm: syz.1.295 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_may_pull include/linux/skbuff.h:2882 [inline]
RIP: 0010:qdisc_pkt_len_segs_init+0x4b4/0xa30 net/core/dev.c:4189
Code: 00 00 02 00 31 ff e8 bb a6 17 f8 81 e3 00 00 02 00 0f 85 fd 00 00 00 e8 aa a1 17 f8 45 89 e7 e9 2c ff ff ff e8 9d a1 17 f8 90 <0f> 0b 90 e9 ee fd ff ff 44 89 e7 89 de e8 9a a3 17 f8 41 39 dc 0f
RSP: 0018:ffffc90000007660 EFLAGS: 00010246
RAX: ffffffff89b01203 RBX: 0000000000000003 RCX: ffff88802bc61f40
RDX: 8000000000000100 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffff888012165640 R08: 0000000000000100 R09: 1ffff110053bd00c
R10: dffffc0000000000 R11: ffffed10053bd00d R12: 00000000fffffffe
R13: dffffc0000000000 R14: 1ffff1100242cae3 R15: ffff88805593b598
FS:  00007f48a44dc6c0(0000) GS:ffff888124ce0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001000000008 CR3: 0000000079dfa000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 sch_handle_ingress net/core/dev.c:4530 [inline]
 __netif_receive_skb_core+0x13b0/0x30c0 net/core/dev.c:6115
 __netif_receive_skb_list_core+0x24d/0x830 net/core/dev.c:6339
 __netif_receive_skb_list net/core/dev.c:6406 [inline]
 netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6497
 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:6865
 gro_cell_poll+0x5ff/0x630 net/core/gro_cells.c:74
 __napi_poll+0xaa/0x330 net/core/dev.c:7787
 napi_poll net/core/dev.c:7850 [inline]
 net_rx_action+0x61d/0xf50 net/core/dev.c:8007
 handle_softirqs+0x226/0x860 kernel/softirq.c:645
 do_softirq+0x77/0xd0 kernel/softirq.c:546
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x100/0x140 kernel/softirq.c:473
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 tun_rx_batched+0x616/0x790 drivers/net/tun.c:-1
 tun_get_user+0x2be0/0x44d0 drivers/net/tun.c:2045
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:2091
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_write+0x150/0x270 fs/read_write.c:739
 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: 0033:0x7f48a359e159
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:00007f48a44dc028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f48a3825fa0 RCX: 00007f48a359e159
RDX: 000000000000007a RSI: 00002000000004c0 RDI: 0000000000000004
RBP: 00007f48a3635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f48a3826038 R14: 00007f48a3825fa0 R15: 00007ffeb74330a8
 </TASK>