[    1.998103] ------------[ cut here ]------------
[    1.998222] refcount_t: underflow; use-after-free.
[    1.998291] WARNING: CPU: 2 PID: 228 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    1.998374] Modules linked in:
[    1.998425] CPU: 2 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    1.998507] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    1.998571] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    1.998627] Code: a6 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 11 a6 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
[    1.998760] RSP: 0018:ffffbede8052fe50 EFLAGS: 00010286
[    1.998815] RAX: 0000000000000000 RBX: ffffbede8052fe60 RCX: 00000000ffffdfff
[    1.998884] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    1.998954] RBP: ffffbede8052f988 R08: ffffffffa6556a28 R09: 00000000ffffdfff
[    1.999024] R10: ffffffffa6476a40 R11: ffffffffa6526a40 R12: dead000000000122
[    1.999106] R13: 00000000fffb7371 R14: 0000000000000001 R15: ffff9aae8327c000
[    1.999184] FS:  00000000206243c0(0000) GS:ffff9aaf180e6000(0000) knlGS:0000000000000000
[    1.999257] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    1.999319] CR2: 00007f56b2275000 CR3: 0000000004e1c004 CR4: 0000000000772ef0
[    1.999391] PKRU: 55555554
[    1.999412] Call Trace:
[    1.999448]  <TASK>
[    1.999489]  netdev_run_todo+0x21a/0x550
[    1.999542]  ? __tun_detach+0x2ed/0x490
[    1.999592]  tun_chr_close+0x47/0xa0
[    1.999640]  __fput+0xda/0x290
[    1.999690]  __x64_sys_close+0x3d/0x80
[    1.999739]  do_syscall_64+0xa4/0xfd0
[    1.999790]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    1.999847] RIP: 0033:0x4901eb
[    1.999896] 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
[    2.000027] RSP: 002b:00007ffc15875020 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.000122] RAX: ffffffffffffffda RBX: 00007ffc15875578 RCX: 00000000004901eb
[    2.000202] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.000294] RBP: 00007ffc15875060 R08: 0000000000000000 R09: 0000000000000000
[    2.000380] R10: 0000000020630be0 R11: 0000000000000293 R12: 00007ffc158754f8
[    2.000469] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.000564]  </TASK>
[    2.000611] ---[ end trace 0000000000000000 ]---