[    6.056763] ------------[ cut here ]------------
[    6.056891] refcount_t: underflow; use-after-free.
[    6.056957] WARNING: CPU: 3 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    6.057045] Modules linked in:
[    6.057086] CPU: 3 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    6.057236] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    6.057299] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    6.057352] Code: 8c 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 31 8c 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
[    6.057512] RSP: 0018:ffffa6220056fe50 EFLAGS: 00010286
[    6.057555] RAX: 0000000000000000 RBX: ffffa6220056fe60 RCX: 00000000ffffdfff
[    6.057617] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    6.057693] RBP: ffffa6220056f988 R08: ffffffff8c756a28 R09: 00000000ffffdfff
[    6.057761] R10: ffffffff8c676a40 R11: ffffffff8c726a40 R12: dead000000000122
[    6.057869] R13: 00000000fffb8346 R14: 0000000000000001 R15: ffff97c841f44000
[    6.057968] FS:  00000000130853c0(0000) GS:ffff97c8f1f66000(0000) knlGS:0000000000000000
[    6.058059] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.058105] CR2: 00007ff4233c7199 CR3: 0000000005144003 CR4: 0000000000772ef0
[    6.058187] PKRU: 55555554
[    6.058208] Call Trace:
[    6.058233]  <TASK>
[    6.058258]  netdev_run_todo+0x21a/0x550
[    6.058308]  ? __tun_detach+0x2ed/0x490
[    6.058349]  tun_chr_close+0x47/0xa0
[    6.058406]  __fput+0xda/0x290
[    6.058445]  __x64_sys_close+0x3d/0x80
[    6.058479]  do_syscall_64+0xa4/0xfd0
[    6.058517]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    6.058577] RIP: 0033:0x4901eb
[    6.058608] 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
[    6.058774] RSP: 002b:00007ffcb4bf1bb0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    6.058862] RAX: ffffffffffffffda RBX: 00007ffcb4bf2108 RCX: 00000000004901eb
[    6.058945] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    6.059000] RBP: 00007ffcb4bf1bf0 R08: 0000000000000000 R09: 0000000000000000
[    6.059067] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffcb4bf2088
[    6.059121] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    6.059187]  </TASK>
[    6.059207] ---[ end trace 0000000000000000 ]---