------------[ 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.5.3856/18388
WARNING: ./include/linux/skbuff.h:2864 at pskb_may_pull include/linux/skbuff.h:2882 [inline], CPU#0: syz.5.3856/18388
WARNING: ./include/linux/skbuff.h:2864 at qdisc_pkt_len_segs_init+0x4b4/0xa30 net/core/dev.c:4141, CPU#0: syz.5.3856/18388
Modules linked in:
CPU: 0 UID: 0 PID: 18388 Comm: syz.5.3856 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
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:4141
Code: 00 00 02 00 31 ff e8 9b 88 24 f8 81 e3 00 00 02 00 0f 85 fd 00 00 00 e8 4a 84 24 f8 45 89 e7 e9 2c ff ff ff e8 3d 84 24 f8 90 <0f> 0b 90 e9 ee fd ff ff 44 89 e7 89 de e8 ea 85 24 f8 41 39 dc 0f
RSP: 0018:ffffc90000007660 EFLAGS: 00010246
RAX: ffffffff89a1ed43 RBX: 0000000000000003 RCX: ffff88801db89f00
RDX: 0000000000000100 RSI: 00000000fffffffa RDI: 0000000000000000
RBP: ffff8880216ec3c0 R08: ffff8880547fe067 R09: 1ffff1100a8ffc0c
R10: dffffc0000000000 R11: ffffed100a8ffc0d R12: 00000000fffffffa
R13: dffffc0000000000 R14: 1ffff110042dd893 R15: ffff888079d3fc18
FS:  00007ff8ed6406c0(0000) GS:ffff888124f54000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000010000 CR3: 0000000060ce0000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 sch_handle_ingress net/core/dev.c:4482 [inline]
 __netif_receive_skb_core+0x13aa/0x30b0 net/core/dev.c:6063
 __netif_receive_skb_list_core+0x24d/0x830 net/core/dev.c:6287
 __netif_receive_skb_list net/core/dev.c:6354 [inline]
 netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6445
 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:6813
 gro_cell_poll+0x5ab/0x5d0 net/core/gro_cells.c:74
 __napi_poll+0xaa/0x330 net/core/dev.c:7735
 napi_poll net/core/dev.c:7798 [inline]
 net_rx_action+0x61d/0xf50 net/core/dev.c:7955
 handle_softirqs+0x225/0x840 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+0x616/0x790 drivers/net/tun.c:-1
 tun_get_user+0x2b44/0x4370 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+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:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8ec79de99
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:00007ff8ed640028 EFLAGS: 00000246
 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff8eca25fa0 RCX: 00007ff8ec79de99
RDX: 000000000000fdef RSI: 00002000000002c0 RDI: 0000000000000004
RBP: 00007ff8ec833eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff8eca26038 R14: 00007ff8eca25fa0 R15: 00007ff8ecb4fa48
 </TASK>