------------[ cut here ]------------ refcount_t: decrement hit 0; leaking memory. WARNING: CPU: 1 PID: 11716 at lib/refcount.c:31 refcount_warn_saturate+0xbf/0x1e0 lib/refcount.c:31 Modules linked in: CPU: 1 PID: 11716 Comm: kworker/u4:11 Not tainted 5.15.0-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 89 11 82 09 31 ff 89 de e8 8d ae 9e fd 84 db 75 e0 e8 44 a8 9e fd 48 c7 c7 60 2a e4 89 c6 05 69 11 82 09 01 e8 a1 55 1b 05 <0f> 0b eb c4 e8 28 a8 9e fd 0f b6 1d 58 11 82 09 31 ff 89 de e8 58 RSP: 0018:ffffc90002c0f9e8 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff88801dd93a00 RSI: ffffffff815ef908 RDI: fffff52000581f2f RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815e96ee R11: 0000000000000000 R12: ffff8880341885b0 R13: ffff8880341885a0 R14: fffffbfff16c1e30 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f371c29f4c2 CR3: 0000000077af0000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 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:10624 default_device_exit_batch+0x2ff/0x3c0 net/core/dev.c:11605 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:2297 worker_thread+0x658/0x11f0 kernel/workqueue.c:2444 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295