[    2.781707] ------------[ cut here ]------------
[    2.781834] refcount_t: underflow; use-after-free.
[    2.781902] WARNING: CPU: 3 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.781982] Modules linked in:
[    2.782027] CPU: 3 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.782098] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.782148] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.782194] Code: 8e 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 f1 8e 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
[    2.782319] RSP: 0018:ffffb4a540527e50 EFLAGS: 00010286
[    2.782359] RAX: 0000000000000000 RBX: ffffb4a540527e60 RCX: 00000000ffffdfff
[    2.782417] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.782483] RBP: ffffb4a540527988 R08: ffffffff8f356a28 R09: 00000000ffffdfff
[    2.782555] R10: ffffffff8f276a40 R11: ffffffff8f326a40 R12: dead000000000122
[    2.782649] R13: 00000000fffb767d R14: 0000000000000001 R15: ffff8c0a82018000
[    2.782721] FS:  000000003ac9f3c0(0000) GS:ffff8c0b2f366000(0000) knlGS:0000000000000000
[    2.782785] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.782841] CR2: 00007f05724eb000 CR3: 0000000005944006 CR4: 0000000000772ef0
[    2.782906] PKRU: 55555554
[    2.782929] Call Trace:
[    2.782955]  <TASK>
[    2.782976]  netdev_run_todo+0x21a/0x550
[    2.783019]  ? __tun_detach+0x2ed/0x490
[    2.783057]  tun_chr_close+0x47/0xa0
[    2.783090]  __fput+0xda/0x290
[    2.783130]  __x64_sys_close+0x3d/0x80
[    2.783166]  do_syscall_64+0xa4/0xfd0
[    2.783207]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.783253] RIP: 0033:0x4901eb
[    2.783288] 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
[    2.783415] RSP: 002b:00007ffc323deb70 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.783472] RAX: ffffffffffffffda RBX: 00007ffc323df0c8 RCX: 00000000004901eb
[    2.783524] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.783587] RBP: 00007ffc323debb0 R08: 0000000000000000 R09: 0000000000000000
[    2.783649] R10: 0000000002000000 R11: 0000000000000293 R12: 00007ffc323df048
[    2.783709] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.783785]  </TASK>
[    2.783815] ---[ end trace 0000000000000000 ]---