------------[ cut here ]------------
len > ((int)(~0U >> 1))
WARNING: ./include/linux/skbuff.h:2863 at pskb_may_pull_reason include/linux/skbuff.h:2863 [inline], CPU#3: syz.6.1695/12047
WARNING: ./include/linux/skbuff.h:2863 at pskb_may_pull include/linux/skbuff.h:2881 [inline], CPU#3: syz.6.1695/12047
WARNING: ./include/linux/skbuff.h:2863 at qdisc_pkt_len_segs_init+0x7af/0xb30 net/core/dev.c:4136, CPU#3: syz.6.1695/12047
Modules linked in:
CPU: 3 UID: 0 PID: 12047 Comm: syz.6.1695 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
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+0x7af/0xb30 net/core/dev.c:4136
Code: 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 0f 84 38 fd ff ff 3c 03 0f 8f 30 fd ff ff e8 bc 8f 16 f9 e9 26 fd ff ff e8 e2 d0 a8 f8 90 <0f> 0b 90 e9 2f fb ff ff 48 89 cf e8 a1 8f 16 f9 e9 b6 f8 ff ff e8
RSP: 0018:ffffc900006f8708 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88802aa7ef00 RCX: ffffffff895fd94d
RDX: ffff888057be2500 RSI: ffffffff895fde1e RDI: ffff888057be2500
RBP: ffff888023811ec0 R08: 0000000000000005 R09: 0000000000000000
R10: 00000000fffffffa R11: 0000000000000000 R12: 00000000ffffffe6
R13: ffff88802aa7ef28 R14: 00000000fffffffa R15: 0000000000000001
FS:  00007f772005f6c0(0000) GS:ffff8880d666d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000010000 CR3: 0000000026428000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 sch_handle_ingress net/core/dev.c:4477 [inline]
 __netif_receive_skb_core.constprop.0+0x1144/0x3530 net/core/dev.c:6053
 __netif_receive_skb_list_core+0x353/0x940 net/core/dev.c:6277
 __netif_receive_skb_list net/core/dev.c:6344 [inline]
 netif_receive_skb_list_internal+0x722/0xd40 net/core/dev.c:6435
 gro_normal_list include/net/gro.h:523 [inline]
 gro_normal_list include/net/gro.h:519 [inline]
 gro_flush_normal include/net/gro.h:531 [inline]
 napi_complete_done+0x221/0x940 net/core/dev.c:6803
 gro_cell_poll+0x46e/0x690 net/core/gro_cells.c:74
 __napi_poll.constprop.0+0xaf/0x450 net/core/dev.c:7733
 napi_poll net/core/dev.c:7796 [inline]
 net_rx_action+0xa40/0xf20 net/core/dev.c:7953
 handle_softirqs+0x1ea/0xa00 kernel/softirq.c:622
 do_softirq kernel/softirq.c:523 [inline]
 do_softirq+0xac/0xe0 kernel/softirq.c:510
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xf8/0x120 kernel/softirq.c:450
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 tun_rx_batched.isra.0+0x407/0x750 drivers/net/tun.c:1512
 tun_get_user+0x1e31/0x3c20 drivers/net/tun.c:1955
 tun_chr_write_iter+0xdc/0x200 drivers/net/tun.c:2001
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1070 fs/read_write.c:688
 ksys_write+0x12a/0x250 fs/read_write.c:740
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x10b/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f771f19ce59
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:00007f772005f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f771f415fa0 RCX: 00007f771f19ce59
RDX: 000000000000fdef RSI: 00002000000002c0 RDI: 0000000000000009
RBP: 00007f771f232d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f771f416038 R14: 00007f771f415fa0 R15: 00007ffe6eb5c378
 </TASK>