[    5.714349] ------------[ cut here ]------------
[    5.714431] refcount_t: underflow; use-after-free.
[    5.714490] WARNING: CPU: 3 PID: 227 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    5.714574] Modules linked in:
[    5.714611] CPU: 3 UID: 0 PID: 227 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    5.714690] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    5.714737] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    5.714784] Code: 91 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 51 91 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
[    5.714914] RSP: 0018:ffffba22c05c7e50 EFLAGS: 00010286
[    5.714957] RAX: 0000000000000000 RBX: ffffba22c05c7e60 RCX: 00000000ffffdfff
[    5.715016] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    5.715069] RBP: ffffba22c05c7988 R08: ffffffff91956a28 R09: 00000000ffffdfff
[    5.715128] R10: ffffffff91876a40 R11: ffffffff91926a40 R12: dead000000000122
[    5.715188] R13: 00000000fffb81f6 R14: 0000000000000001 R15: ffff971202084000
[    5.715243] FS:  000000002c27f3c0(0000) GS:ffff9712acd66000(0000) knlGS:0000000000000000
[    5.715313] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.715364] CR2: 000055a63a9ca028 CR3: 0000000002f20006 CR4: 0000000000772ef0
[    5.715426] PKRU: 55555554
[    5.715450] Call Trace:
[    5.715475]  <TASK>
[    5.715499]  netdev_run_todo+0x21a/0x550
[    5.715541]  ? __tun_detach+0x2ed/0x490
[    5.715579]  tun_chr_close+0x47/0xa0
[    5.715620]  __fput+0xda/0x290
[    5.715668]  __x64_sys_close+0x3d/0x80
[    5.715703]  do_syscall_64+0xa4/0xfd0
[    5.715743]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    5.715795] RIP: 0033:0x4901eb
[    5.715828] 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
[    5.715957] RSP: 002b:00007fff489ca130 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    5.716019] RAX: ffffffffffffffda RBX: 00007fff489ca688 RCX: 00000000004901eb
[    5.716079] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    5.716137] RBP: 00007fff489ca170 R08: 0000000000000000 R09: 0000000000000000
[    5.716194] R10: 0000000000000010 R11: 0000000000000293 R12: 00007fff489ca608
[    5.716260] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    5.716331]  </TASK>
[    5.716352] ---[ end trace 0000000000000000 ]---