[    2.718603] ------------[ cut here ]------------
[    2.718735] refcount_t: underflow; use-after-free.
[    2.718790] WARNING: CPU: 0 PID: 227 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.718855] Modules linked in:
[    2.718887] CPU: 0 UID: 0 PID: 227 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.718953] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.718997] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.719037] Code: ae 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 91 ae 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
[    2.719162] RSP: 0018:ffffa30ac037be50 EFLAGS: 00010286
[    2.719208] RAX: 0000000000000000 RBX: ffffa30ac037be60 RCX: 00000000ffffdfff
[    2.719276] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.719329] RBP: ffffa30ac037b988 R08: ffffffffaed56a28 R09: 00000000ffffdfff
[    2.719376] R10: ffffffffaec76a40 R11: ffffffffaed26a40 R12: dead000000000122
[    2.719423] R13: 00000000fffb7638 R14: 0000000000000001 R15: ffff894dc5e70000
[    2.719472] FS:  000000001f4263c0(0000) GS:ffff894e4f7e6000(0000) knlGS:0000000000000000
[    2.719537] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.719590] CR2: 00007f80bf540000 CR3: 0000000005cd5001 CR4: 0000000000772ef0
[    2.719647] PKRU: 55555554
[    2.719667] Call Trace:
[    2.719685]  <TASK>
[    2.719707]  netdev_run_todo+0x21a/0x550
[    2.719740]  ? __tun_detach+0x2ed/0x490
[    2.719769]  tun_chr_close+0x47/0xa0
[    2.719801]  __fput+0xda/0x290
[    2.719839]  __x64_sys_close+0x3d/0x80
[    2.719869]  do_syscall_64+0xa4/0xfd0
[    2.719901]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.719940] RIP: 0033:0x4901eb
[    2.720009] 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
[    2.720135] RSP: 002b:00007ffd701dc450 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.720199] RAX: ffffffffffffffda RBX: 00007ffd701dc9a8 RCX: 00000000004901eb
[    2.720253] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.720315] RBP: 00007ffd701dc490 R08: 0000000000000000 R09: 0000000000000000
[    2.720373] R10: 0000000002000000 R11: 0000000000000293 R12: 00007ffd701dc928
[    2.720428] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.720485]  </TASK>
[    2.720513] ---[ end trace 0000000000000000 ]---