[    2.246739] ------------[ cut here ]------------
[    2.246836] refcount_t: underflow; use-after-free.
[    2.246906] WARNING: CPU: 0 PID: 227 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.246997] Modules linked in:
[    2.247041] CPU: 0 UID: 0 PID: 227 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.247136] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.247206] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.247266] Code: b4 e8 18 df ba ff 90 0f 0b 90 90 c3 80 3d 79 c9 eb 00 00 75 89 c6 05 70 c9 eb 00 01 90 48 c7 c7 f0 8d d1 b4 e8 f5 de ba ff 90 <0f> 0b 90 90 c3 80 3d 54 c9 eb 00 00 0f 85 62 ff ff ff c6 05 47 c9
[    2.247450] RSP: 0018:ffffbc2d4058fe50 EFLAGS: 00010286
[    2.247509] RAX: 0000000000000000 RBX: ffffbc2d4058fe60 RCX: 00000000ffffdfff
[    2.247589] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.247666] RBP: ffffbc2d4058f988 R08: ffffffffb5156a28 R09: 00000000ffffdfff
[    2.247748] R10: ffffffffb5076a40 R11: ffffffffb5126a40 R12: dead000000000122
[    2.247832] R13: 00000000fffb7469 R14: 0000000000000001 R15: ffff9648055ac000
[    2.247913] FS:  00000000116dd3c0(0000) GS:ffff9648893e6000(0000) knlGS:0000000000000000
[    2.247999] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.248073] CR2: 00007f016cd50000 CR3: 0000000005523002 CR4: 0000000000772ef0
[    2.248153] PKRU: 55555554
[    2.248186] Call Trace:
[    2.248215]  <TASK>
[    2.248239]  netdev_run_todo+0x21a/0x550
[    2.248290]  ? __tun_detach+0x2ed/0x490
[    2.248337]  tun_chr_close+0x47/0xa0
[    2.248385]  __fput+0xda/0x290
[    2.248430]  __x64_sys_close+0x3d/0x80
[    2.248478]  do_syscall_64+0xa4/0xfd0
[    2.248524]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.248584] RIP: 0033:0x4901eb
[    2.248630] Code: 03 00 00 00 0f 05 48 3d 00 f0 ff ff 77 41 c3 48 83 ec 18 89 7c 24 0c e8 c3 78 04 00 8b 7c 24 0c 41 89 c0 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 44 89 c7 89 44 24 0c e8 21 79 04 00 8b 44
[    2.248823] RSP: 002b:00007ffece83a060 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.248912] RAX: ffffffffffffffda RBX: 00007ffece83a5b8 RCX: 00000000004901eb
[    2.248991] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.249071] RBP: 00007ffece83a0a0 R08: 0000000000000000 R09: 0000000000000000
[    2.249150] R10: 00000000116e44e0 R11: 0000000000000293 R12: 00007ffece83a538
[    2.249226] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.249306]  </TASK>
[    2.249331] ---[ end trace 0000000000000000 ]---