[    2.628782] ------------[ cut here ]------------
[    2.628942] refcount_t: underflow; use-after-free.
[    2.629033] WARNING: CPU: 2 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.629140] Modules linked in:
[    2.629203] CPU: 2 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.629307] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.629403] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.629480] Code: bc 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 bc 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
[    2.629642] RSP: 0018:ffffa93e4057fe50 EFLAGS: 00010286
[    2.629728] RAX: 0000000000000000 RBX: ffffa93e4057fe60 RCX: 00000000ffffdfff
[    2.629812] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.629904] RBP: ffffa93e4057f988 R08: ffffffffbcf56a28 R09: 00000000ffffdfff
[    2.629990] R10: ffffffffbce76a40 R11: ffffffffbcf26a40 R12: dead000000000122
[    2.630082] R13: 00000000fffb75de R14: 0000000000000001 R15: ffff9d7942c64000
[    2.630170] FS:  000000003d3ca3c0(0000) GS:ffff9d79c16e6000(0000) knlGS:0000000000000000
[    2.630257] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.630341] CR2: 00007f04fb9fc000 CR3: 0000000004a7f002 CR4: 0000000000772ef0
[    2.630427] PKRU: 55555554
[    2.630477] Call Trace:
[    2.630528]  <TASK>
[    2.630579]  netdev_run_todo+0x21a/0x550
[    2.630647]  ? __tun_detach+0x2ed/0x490
[    2.630721]  tun_chr_close+0x47/0xa0
[    2.630781]  __fput+0xda/0x290
[    2.630846]  __x64_sys_close+0x3d/0x80
[    2.630906]  do_syscall_64+0xa4/0xfd0
[    2.630969]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.631040] RIP: 0033:0x4901eb
[    2.631100] 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
[    2.631264] RSP: 002b:00007ffccdf01950 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.631357] RAX: ffffffffffffffda RBX: 00007ffccdf01ea8 RCX: 00000000004901eb
[    2.631442] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.631534] RBP: 00007ffccdf01990 R08: 0000000000000000 R09: 0000000000000000
[    2.631627] R10: 000000003d3e8870 R11: 0000000000000293 R12: 00007ffccdf01e28
[    2.631725] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.631819]  </TASK>
[    2.631869] ---[ end trace 0000000000000000 ]---