[    2.666206] ------------[ cut here ]------------
[    2.666349] refcount_t: underflow; use-after-free.
[    2.666422] WARNING: CPU: 0 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.666521] Modules linked in:
[    2.666578] CPU: 0 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.666670] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.666730] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.666787] Code: 92 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 92 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
[    2.666932] RSP: 0018:ffffaf74c059fe50 EFLAGS: 00010286
[    2.666974] RAX: 0000000000000000 RBX: ffffaf74c059fe60 RCX: 00000000ffffdfff
[    2.667058] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.667131] RBP: ffffaf74c059f988 R08: ffffffff92d56a28 R09: 00000000ffffdfff
[    2.667195] R10: ffffffff92c76a40 R11: ffffffff92d26a40 R12: dead000000000122
[    2.667258] R13: 00000000fffb75f6 R14: 0000000000000001 R15: ffff89bc45c60000
[    2.667338] FS:  00000000250563c0(0000) GS:ffff89bceb7e6000(0000) knlGS:0000000000000000
[    2.667396] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.667453] CR2: 00007f59b7e32000 CR3: 0000000002f1c001 CR4: 0000000000772ef0
[    2.667525] PKRU: 55555554
[    2.667554] Call Trace:
[    2.667584]  <TASK>
[    2.667611]  netdev_run_todo+0x21a/0x550
[    2.667659]  ? __tun_detach+0x2ed/0x490
[    2.667698]  tun_chr_close+0x47/0xa0
[    2.667731]  __fput+0xda/0x290
[    2.667770]  __x64_sys_close+0x3d/0x80
[    2.667804]  do_syscall_64+0xa4/0xfd0
[    2.667859]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.667915] RIP: 0033:0x4901eb
[    2.667967] 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
[    2.668102] RSP: 002b:00007ffcc126a110 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.668172] RAX: ffffffffffffffda RBX: 00007ffcc126a668 RCX: 00000000004901eb
[    2.668237] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.668325] RBP: 00007ffcc126a150 R08: 0000000000000000 R09: 0000000000000000
[    2.668380] R10: 0000000025070d30 R11: 0000000000000293 R12: 00007ffcc126a5e8
[    2.668444] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.668510]  </TASK>
[    2.668537] ---[ end trace 0000000000000000 ]---