------------[ cut here ]------------
WARNING: CPU: 0 PID: 4117 at net/core/dev.c:9596 dev_index_reserve+0xf8/0x210
Modules linked in:
CPU: 0 PID: 4117 Comm: syz-executor.4 Not tainted 6.6.0-rc5-syzkaller-00072-g401644852d0b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:dev_index_reserve+0xf8/0x210 net/core/dev.c:9596
Code: 7e cf aa f8 2e 2e 2e 31 c0 4c 89 e7 e8 f1 78 21 02 4c 89 e7 48 89 de 31 d2 b9 c0 0c 00 00 e8 2f 86 13 02 eb 69 e8 68 82 d6 f8 <0f> 0b bb ea ff ff ff e9 93 00 00 00 e8 57 82 d6 f8 49 83 c7 50 bf
RSP: 0018:ffffc90005e37b20 EFLAGS: 00010287
RAX: ffffffff88b78898 RBX: 00000000f63da627 RCX: 0000000000040000
RDX: ffffc9000c1c7000 RSI: 0000000000000fe0 RDI: 0000000000000fe1
RBP: ffffc90005e37bb0 R08: ffffffff88b7882e R09: 1ffff110110ae410
R10: dffffc0000000000 R11: ffffed10110ae411 R12: dffffc0000000000
R13: 1ffff92000bc6f68 R14: 1ffff92000bc6f64 R15: ffff888080db57c0
FS:  00007f3a5abfe6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000020739000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 register_netdevice+0x76a/0x1510 net/core/dev.c:10084
 tun_set_iff+0x861/0xe80 drivers/net/tun.c:2850
 __tun_chr_ioctl+0x872/0x2490 drivers/net/tun.c:3118
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f3a5c07cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f3a5abfe0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f3a5c19bf80 RCX: 00007f3a5c07cae9
RDX: 0000000020000200 RSI: 00000000400454ca RDI: 0000000000000004
RBP: 00007f3a5c0c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f3a5c19bf80 R15: 00007ffd758a2528
 </TASK>