------------[ cut here ]------------ refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 0 PID: 3761 at lib/refcount.c:31 refcount_warn_saturate+0xbf/0x1e0 lib/refcount.c:31 Modules linked in: CPU: 0 PID: 3761 Comm: kworker/u16:5 Not tainted 5.16.0-rc1-syzkaller #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: netns cleanup_net RIP: 0010:refcount_warn_saturate+0xbf/0x1e0 lib/refcount.c:31 Code: 1d 38 f4 a1 09 31 ff 89 de e8 fd ef 9c fd 84 db 75 e0 e8 14 ec 9c fd 48 c7 c7 e0 d4 04 8a c6 05 18 f4 a1 09 01 e8 3b a3 25 05 <0f> 0b eb c4 e8 f8 eb 9c fd 0f b6 1d 07 f4 a1 09 31 ff 89 de e8 c8 RSP: 0018:ffffc900060979e8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88801ae8d700 RSI: ffffffff815f0c28 RDI: fffff52000c12f2f RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815ea9ce R11: 0000000000000000 R12: ffff88800b6da5b0 R13: ffff88800b6da5a0 R14: fffffbfff1701e30 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff88802cb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efdc4604300 CR3: 000000000b88e000 CR4: 0000000000150ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000008d3538c9 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __refcount_dec include/linux/refcount.h:344 [inline] refcount_dec include/linux/refcount.h:359 [inline] dev_put include/linux/netdevice.h:4166 [inline] vlan_dev_free+0xdc/0x100 net/8021q/vlan_dev.c:848 netdev_run_todo+0x6b4/0xa80 net/core/dev.c:10627 default_device_exit_batch+0x2ff/0x3c0 net/core/dev.c:11608 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