------------[ cut here ]------------
WARNING: CPU: 0 PID: 6105 at net/core/dev.c:9600 dev_index_reserve+0x1a2/0x1c0 net/core/dev.c:9600
Modules linked in:
CPU: 0 PID: 6105 Comm: syz-executor.4 Not tainted 6.6.0-rc6-syzkaller-00039-g06dc10eae55b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023
RIP: 0010:dev_index_reserve+0x1a2/0x1c0 net/core/dev.c:9600
Code: 00 31 d2 4d 8d 45 50 b9 ff ff ff 7f 48 8d 74 24 20 e8 92 47 03 02 4c 89 e7 89 c3 e8 e8 51 12 02 e9 48 ff ff ff e8 0e 68 56 f9 <0f> 0b bb ea ff ff ff e9 52 ff ff ff e8 dd 99 0e 02 66 66 2e 0f 1f
RSP: 0018:ffffc90014a1fc30 EFLAGS: 00010287
RAX: 0000000000002e60 RBX: 0000000098747554 RCX: ffffc9000a9a5000
RDX: 0000000000040000 RSI: ffffffff88316232 RDI: 0000000000000005
RBP: 1ffff92002943f86 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000098747554 R11: 0000000000000000 R12: ffff888028544010
R13: ffff888034ec0000 R14: ffff888028544000 R15: ffff8880285440f8
FS:  00007fa12139c6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000002694f000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 register_netdevice+0x69a/0x1490 net/core/dev.c:10088
 tun_set_iff drivers/net/tun.c:2850 [inline]
 __tun_chr_ioctl+0x3091/0x4700 drivers/net/tun.c:3118
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl fs/ioctl.c:857 [inline]
 __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa12067cae9
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:00007fa12139c0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fa12079bf80 RCX: 00007fa12067cae9
RDX: 0000000020000200 RSI: 00000000400454ca RDI: 0000000000000004
RBP: 00007fa1206c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fa12079bf80 R15: 00007ffc854ed498
 </TASK>