[    2.888585] ------------[ cut here ]------------
[    2.888708] refcount_t: underflow; use-after-free.
[    2.888767] WARNING: CPU: 0 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.888848] Modules linked in:
[    2.888893] CPU: 0 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.888962] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.889018] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.889061] Code: ad 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 ad 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
[    2.889227] RSP: 0018:ffffb325c05bfe50 EFLAGS: 00010286
[    2.889276] RAX: 0000000000000000 RBX: ffffb325c05bfe60 RCX: 00000000ffffdfff
[    2.889357] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.889422] RBP: ffffb325c05bf988 R08: ffffffffadf56a28 R09: 00000000ffffdfff
[    2.889489] R10: ffffffffade76a40 R11: ffffffffadf26a40 R12: dead000000000122
[    2.889555] R13: 00000000fffb76ea R14: 0000000000000001 R15: ffff9403412c8000
[    2.889624] FS:  00000000192413c0(0000) GS:ffff9403d05e6000(0000) knlGS:0000000000000000
[    2.889691] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.889755] CR2: 00007fc5086b1000 CR3: 00000000065ae005 CR4: 0000000000772ef0
[    2.889825] PKRU: 55555554
[    2.889848] Call Trace:
[    2.889874]  <TASK>
[    2.889898]  netdev_run_todo+0x21a/0x550
[    2.889939]  ? __tun_detach+0x2ed/0x490
[    2.889977]  tun_chr_close+0x47/0xa0
[    2.890011]  __fput+0xda/0x290
[    2.890055]  __x64_sys_close+0x3d/0x80
[    2.890095]  do_syscall_64+0xa4/0xfd0
[    2.890135]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.890189] RIP: 0033:0x4901eb
[    2.890224] 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
[    2.890376] RSP: 002b:00007fff9833c4b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.890444] RAX: ffffffffffffffda RBX: 00007fff9833ca08 RCX: 00000000004901eb
[    2.890514] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.890586] RBP: 00007fff9833c4f0 R08: 0000000000000000 R09: 0000000000000000
[    2.890652] R10: 0000000019260b50 R11: 0000000000000293 R12: 00007fff9833c988
[    2.890715] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.890796]  </TASK>
[    2.890821] ---[ end trace 0000000000000000 ]---