[    2.519841] ------------[ cut here ]------------
[    2.519947] refcount_t: underflow; use-after-free.
[    2.519998] WARNING: CPU: 3 PID: 227 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.520062] Modules linked in:
[    2.520095] CPU: 3 UID: 0 PID: 227 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.520173] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.520220] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.520264] Code: 95 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 91 95 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
[    2.520383] RSP: 0018:ffff9cdfc058fe50 EFLAGS: 00010286
[    2.520429] RAX: 0000000000000000 RBX: ffff9cdfc058fe60 RCX: 00000000ffffdfff
[    2.520489] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.520544] RBP: ffff9cdfc058f988 R08: ffffffff95d56a28 R09: 00000000ffffdfff
[    2.520593] R10: ffffffff95c76a40 R11: ffffffff95d26a40 R12: dead000000000122
[    2.520640] R13: 00000000fffb7563 R14: 0000000000000001 R15: ffff8972832e8000
[    2.520696] FS:  000000003bf863c0(0000) GS:ffff897328966000(0000) knlGS:0000000000000000
[    2.520751] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.520804] CR2: 00007f260a848000 CR3: 0000000006d0a005 CR4: 0000000000772ef0
[    2.520861] PKRU: 55555554
[    2.520882] Call Trace:
[    2.520900]  <TASK>
[    2.520915]  netdev_run_todo+0x21a/0x550
[    2.520952]  ? __tun_detach+0x2ed/0x490
[    2.520987]  tun_chr_close+0x47/0xa0
[    2.521017]  __fput+0xda/0x290
[    2.521048]  __x64_sys_close+0x3d/0x80
[    2.521077]  do_syscall_64+0xa4/0xfd0
[    2.521123]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.521161] RIP: 0033:0x4901eb
[    2.521192] 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
[    2.521317] RSP: 002b:00007ffcade95cc0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.521373] RAX: ffffffffffffffda RBX: 00007ffcade96218 RCX: 00000000004901eb
[    2.521428] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.521482] RBP: 00007ffcade95d00 R08: 0000000000000000 R09: 0000000000000000
[    2.521531] R10: 0000000000000007 R11: 0000000000000293 R12: 00007ffcade96198
[    2.521580] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.521629]  </TASK>
[    2.521650] ---[ end trace 0000000000000000 ]---