[    4.012471] ------------[ cut here ]------------
[    4.012609] refcount_t: underflow; use-after-free.
[    4.012683] WARNING: CPU: 2 PID: 227 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    4.012761] Modules linked in:
[    4.012811] CPU: 2 UID: 0 PID: 227 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    4.012891] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    4.012954] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    4.013009] Code: a4 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 b1 a4 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
[    4.013146] RSP: 0018:ffffa184c0587e50 EFLAGS: 00010286
[    4.013201] RAX: 0000000000000000 RBX: ffffa184c0587e60 RCX: 00000000ffffdfff
[    4.013271] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    4.013341] RBP: ffffa184c0587988 R08: ffffffffa4f56a28 R09: 00000000ffffdfff
[    4.013410] R10: ffffffffa4e76a40 R11: ffffffffa4f26a40 R12: dead000000000122
[    4.013493] R13: 00000000fffb7b4f R14: 0000000000000001 R15: ffff894f83264000
[    4.013573] FS:  000000001ec123c0(0000) GS:ffff8950196e6000(0000) knlGS:0000000000000000
[    4.013650] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.013713] CR2: 00007fba9f8f1000 CR3: 00000000055b1006 CR4: 0000000000772ef0
[    4.013784] PKRU: 55555554
[    4.013823] Call Trace:
[    4.013865]  <TASK>
[    4.013904]  netdev_run_todo+0x21a/0x550
[    4.013959]  ? __tun_detach+0x2ed/0x490
[    4.014010]  tun_chr_close+0x47/0xa0
[    4.014063]  __fput+0xda/0x290
[    4.014116]  __x64_sys_close+0x3d/0x80
[    4.014165]  do_syscall_64+0xa4/0xfd0
[    4.014218]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    4.014276] RIP: 0033:0x4901eb
[    4.014324] 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
[    4.014459] RSP: 002b:00007ffe02b91890 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    4.014530] RAX: ffffffffffffffda RBX: 00007ffe02b91de8 RCX: 00000000004901eb
[    4.014614] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    4.014685] RBP: 00007ffe02b918d0 R08: 0000000000000000 R09: 0000000000000000
[    4.014754] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffe02b91d68
[    4.014824] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    4.014894]  </TASK>
[    4.014933] ---[ end trace 0000000000000000 ]---