[    2.784842] ------------[ cut here ]------------
[    2.784939] refcount_t: underflow; use-after-free.
[    2.785020] WARNING: CPU: 3 PID: 227 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.785129] Modules linked in:
[    2.785182] CPU: 3 UID: 0 PID: 227 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.785290] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.785366] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.785433] Code: 98 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 f1 98 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
[    2.785633] RSP: 0018:ffffb5e5c0597e50 EFLAGS: 00010286
[    2.785690] RAX: 0000000000000000 RBX: ffffb5e5c0597e60 RCX: 00000000ffffdfff
[    2.785774] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.785863] RBP: ffffb5e5c0597988 R08: ffffffff99356a28 R09: 00000000ffffdfff
[    2.785960] R10: ffffffff99276a40 R11: ffffffff99326a40 R12: dead000000000122
[    2.786045] R13: 00000000fffb7682 R14: 0000000000000001 R15: ffff9e2d01f40000
[    2.786133] FS:  0000000010ec23c0(0000) GS:ffff9e2da5366000(0000) knlGS:0000000000000000
[    2.786226] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.786305] CR2: 00007f5f37040000 CR3: 0000000002f4c003 CR4: 0000000000772ef0
[    2.786392] PKRU: 55555554
[    2.786429] Call Trace:
[    2.786466]  <TASK>
[    2.786501]  netdev_run_todo+0x21a/0x550
[    2.786560]  ? __tun_detach+0x2ed/0x490
[    2.786616]  tun_chr_close+0x47/0xa0
[    2.786658]  __fput+0xda/0x290
[    2.786713]  __x64_sys_close+0x3d/0x80
[    2.786766]  do_syscall_64+0xa4/0xfd0
[    2.786819]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.786888] RIP: 0033:0x4901eb
[    2.786938] 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
[    2.787140] RSP: 002b:00007ffe85524bd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.787230] RAX: ffffffffffffffda RBX: 00007ffe85525128 RCX: 00000000004901eb
[    2.787315] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.787398] RBP: 00007ffe85524c10 R08: 0000000000000000 R09: 0000000000000000
[    2.787481] R10: 0000000002000000 R11: 0000000000000293 R12: 00007ffe855250a8
[    2.787563] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.787646]  </TASK>
[    2.787680] ---[ end trace 0000000000000000 ]---