[    3.082455] ------------[ cut here ]------------
[    3.082583] refcount_t: underflow; use-after-free.
[    3.082696] WARNING: CPU: 3 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    3.082858] Modules linked in:
[    3.082905] CPU: 3 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    3.083017] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    3.083094] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    3.083161] 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 31 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
[    3.083383] RSP: 0018:ffffa32c80587e50 EFLAGS: 00010286
[    3.083457] RAX: 0000000000000000 RBX: ffffa32c80587e60 RCX: 00000000ffffdfff
[    3.083553] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    3.083652] RBP: ffffa32c80587988 R08: ffffffffae756a28 R09: 00000000ffffdfff
[    3.083753] R10: ffffffffae676a40 R11: ffffffffae726a40 R12: dead000000000122
[    3.083849] R13: 00000000fffb77a6 R14: 0000000000000001 R15: ffff97f701f80000
[    3.083949] FS:  000000002c6b93c0(0000) GS:ffff97f78ff66000(0000) knlGS:0000000000000000
[    3.084058] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.084138] CR2: 00007f0df1f79000 CR3: 00000000049a8006 CR4: 0000000000772ef0
[    3.084236] PKRU: 55555554
[    3.084265] Call Trace:
[    3.084298]  <TASK>
[    3.084336]  netdev_run_todo+0x21a/0x550
[    3.084411]  ? __tun_detach+0x2ed/0x490
[    3.084470]  tun_chr_close+0x47/0xa0
[    3.084515]  __fput+0xda/0x290
[    3.084579]  __x64_sys_close+0x3d/0x80
[    3.084636]  do_syscall_64+0xa4/0xfd0
[    3.084703]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    3.084769] RIP: 0033:0x4901eb
[    3.084822] 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
[    3.085038] RSP: 002b:00007ffcbedd39c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    3.085140] RAX: ffffffffffffffda RBX: 00007ffcbedd3f18 RCX: 00000000004901eb
[    3.085230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    3.085322] RBP: 00007ffcbedd3a00 R08: 0000000000000000 R09: 0000000000000000
[    3.085410] R10: 0000000002000000 R11: 0000000000000293 R12: 00007ffcbedd3e98
[    3.085509] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    3.085604]  </TASK>
[    3.085632] ---[ end trace 0000000000000000 ]---