refcount_t: decrement hit 0; leaking memory.
WARNING: CPU: 0 PID: 981 at lib/refcount.c:31 refcount_warn_saturate+0xbf/0x1e0 lib/refcount.c:31
Modules linked in:
CPU: 0 PID: 981 Comm: kworker/u4:5 Not tainted 5.16.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
RIP: 0010:refcount_warn_saturate+0xbf/0x1e0 lib/refcount.c:31
Code: 1d 9e 64 a2 09 31 ff 89 de e8 ed ec 9c fd 84 db 75 e0 e8 04 e9 9c fd 48 c7 c7 20 de 04 8a c6 05 7e 64 a2 09 01 e8 7b d1 33 05 <0f> 0b eb c4 e8 e8 e8 9c fd 0f b6 1d 6d 64 a2 09 31 ff 89 de e8 b8
RSP: 0018:ffffc90004d579e8 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88801b8cba00 RSI: ffffffff815f0ad8 RDI: fffff520009aaf2f
RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff815ea87e R11: 0000000000000000 R12: ffff8880244ca5b0
R13: ffff8880244ca5a0 R14: fffffbfff1701e30 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2c322a8ac0 CR3: 000000006d5f4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __refcount_dec include/linux/refcount.h:344 [inline]
 refcount_dec include/linux/refcount.h:359 [inline]
 dev_put include/linux/netdevice.h:3815 [inline]
 vlan_dev_free+0xdc/0x100 net/8021q/vlan_dev.c:848
 netdev_run_todo+0x6b4/0xa80 net/core/dev.c:9946
 default_device_exit_batch+0x2ff/0x3c0 net/core/dev.c:10927
 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171
 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:593
 process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
 worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>