[    2.670536] eth0: renamed from r1h0
[    2.756536] eth1: renamed from r1h1
[    2.848560] eth2: renamed from r1h2
[    2.941562] eth3: renamed from r1h3
[    6.251381] ------------[ cut here ]------------
[    6.251457] refcount_t: underflow; use-after-free.
[    6.251515] WARNING: CPU: 3 PID: 67 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    6.251621] Modules linked in:
[    6.251672] CPU: 3 UID: 0 PID: 67 Comm: kworker/u16:1 Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    6.251751] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    6.251810] Workqueue: netns cleanup_net
[    6.251858] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    6.251917] Code: a9 e8 e8 54 ba ff 90 0f 0b 90 90 c3 80 3d 00 e6 2b 01 00 75 89 c6 05 f7 e5 2b 01 01 90 48 c7 c7 f8 48 55 a9 e8 c5 54 ba ff 90 <0f> 0b 90 90 c3 80 3d db e5 2b 01 00 0f 85 62 ff ff ff c6 05 ce e5
[    6.252074] RSP: 0000:ffffb17240257d50 EFLAGS: 00010286
[    6.252128] RAX: 0000000000000000 RBX: ffffb17240257d60 RCX: 00000000ffffdfff
[    6.252205] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    6.252269] RBP: ffffb17240257858 R08: ffffffffa9d5ba28 R09: 00000000ffffdfff
[    6.252336] R10: ffffffffa9c7ba40 R11: ffffffffa9d2ba40 R12: dead000000000122
[    6.252413] R13: 00000000fffb840b R14: 0000000000000001 R15: ffff97ae85c52000
[    6.252478] FS:  0000000000000000(0000) GS:ffff97af14911000(0000) knlGS:0000000000000000
[    6.252552] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.252603] CR2: 00007f1aca297ae4 CR3: 00000000049b3001 CR4: 0000000000772ef0
[    6.252671] PKRU: 55555554
[    6.252699] Call Trace:
[    6.252725]  <TASK>
[    6.252747]  netdev_run_todo+0x21a/0x550
[    6.252789]  ops_undo_list+0x1e3/0x1f0
[    6.252828]  cleanup_net+0x1b7/0x300
[    6.252868]  process_one_work+0x162/0x380
[    6.252920]  worker_thread+0x299/0x3c0
[    6.252951]  ? rescuer_thread+0x4c0/0x4c0
[    6.252996]  kthread+0x101/0x1f0
[    6.253035]  ? kthreads_online_cpu+0x110/0x110
[    6.253077]  ? kthreads_online_cpu+0x110/0x110
[    6.253133]  ret_from_fork+0x11c/0x140
[    6.253177]  ? kthreads_online_cpu+0x110/0x110
[    6.253217]  ret_from_fork_asm+0x11/0x20
[    6.253264]  </TASK>
[    6.253288] ---[ end trace 0000000000000000 ]---