[    2.177393] ------------[ cut here ]------------
[    2.177525] refcount_t: underflow; use-after-free.
[    2.177608] WARNING: CPU: 2 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.177693] Modules linked in:
[    2.177751] CPU: 2 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.177839] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.177910] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.177974] Code: b5 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 b5 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
[    2.178114] RSP: 0018:ffffb010c053fe50 EFLAGS: 00010286
[    2.178176] RAX: 0000000000000000 RBX: ffffb010c053fe60 RCX: 00000000ffffdfff
[    2.178253] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.178329] RBP: ffffb010c053f988 R08: ffffffffb6156a28 R09: 00000000ffffdfff
[    2.178421] R10: ffffffffb6076a40 R11: ffffffffb6126a40 R12: dead000000000122
[    2.178510] R13: 00000000fffb7423 R14: 0000000000000001 R15: ffff93ac834d0000
[    2.178589] FS:  000000002655b3c0(0000) GS:ffff93ad084e6000(0000) knlGS:0000000000000000
[    2.178668] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.178737] CR2: 00007f50d491e000 CR3: 00000000030e2002 CR4: 0000000000772ef0
[    2.178816] PKRU: 55555554
[    2.178861] Call Trace:
[    2.178908]  <TASK>
[    2.178954]  netdev_run_todo+0x21a/0x550
[    2.179014]  ? __tun_detach+0x2ed/0x490
[    2.179070]  tun_chr_close+0x47/0xa0
[    2.179124]  __fput+0xda/0x290
[    2.179181]  __x64_sys_close+0x3d/0x80
[    2.179236]  do_syscall_64+0xa4/0xfd0
[    2.179294]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.179366] RIP: 0033:0x4901eb
[    2.179424] 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
[    2.179571] RSP: 002b:00007ffdb2f84490 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.179649] RAX: ffffffffffffffda RBX: 00007ffdb2f849e8 RCX: 00000000004901eb
[    2.179727] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.179804] RBP: 00007ffdb2f844d0 R08: 0000000000000000 R09: 0000000000000000
[    2.179880] R10: 0000000026562c40 R11: 0000000000000293 R12: 00007ffdb2f84968
[    2.179957] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.180036]  </TASK>
[    2.180081] ---[ end trace 0000000000000000 ]---