------------[ cut here ]------------
len > ((int)(~0U >> 1))
WARNING: ./include/linux/skbuff.h:2863 at pskb_may_pull_reason include/linux/skbuff.h:2863 [inline], CPU#0: syz.0.8536/2159
WARNING: ./include/linux/skbuff.h:2863 at pskb_may_pull include/linux/skbuff.h:2881 [inline], CPU#0: syz.0.8536/2159
WARNING: ./include/linux/skbuff.h:2863 at qdisc_pkt_len_segs_init+0x4c1/0xa30 net/core/dev.c:4136, CPU#0: syz.0.8536/2159
Modules linked in:
CPU: 0 UID: 0 PID: 2159 Comm: syz.0.8536 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:2863 [inline]
RIP: 0010:pskb_may_pull include/linux/skbuff.h:2881 [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 0c 00 48 f8 41 81 e6 00 00 02 00 0f 85 fb 00 00 00 e8 ba fb 47 f8 e9 5b 01 00 00 e8 b0 fb 47 f8 90 <0f> 0b 90 e9 e8 fd ff ff 44 89 e7 44 89 f6 e8 5c fd 47 f8 45 39 f4
RSP: 0018:ffffc900000075d0 EFLAGS: 00010246
RAX: ffffffff897db080 RBX: 1ffff1100fb547ab RCX: ffff888036091ec0
RDX: 0000000000000100 RSI: 00000000fffffffe RDI: 0000000000000000
RBP: ffff88807daa3c80 R08: ffff888040d52067 R09: 1ffff110081aa40c
R10: dffffc0000000000 R11: ffffed10081aa40d R12: 00000000fffffffe
R13: dffffc0000000000 R14: 0000000000000003 R15: ffff8880589c4818
FS:  00007f913c6536c0(0000) GS:ffff888125289000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff8815ea4c0 CR3: 000000003423e000 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:7730
 napi_poll net/core/dev.c:7793 [inline]
 net_rx_action+0x627/0xf70 net/core/dev.c:7950
 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_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: 0033:0x7f913b79cdd9
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:00007f913c653028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f913ba15fa0 RCX: 00007f913b79cdd9
RDX: 000000000000007a RSI: 0000200000000400 RDI: 0000000000000004
RBP: 00007f913b832d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f913ba16038 R14: 00007f913ba15fa0 R15: 00007ffe7ac26798
 </TASK>