[    3.694058] ------------[ cut here ]------------
[    3.694249] refcount_t: underflow; use-after-free.
[    3.694353] WARNING: CPU: 2 PID: 228 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    3.694470] Modules linked in:
[    3.694539] CPU: 2 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    3.694650] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    3.694747] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    3.694824] Code: a7 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 71 a7 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
[    3.695027] RSP: 0018:ffffc02ac0597e50 EFLAGS: 00010286
[    3.695106] RAX: 0000000000000000 RBX: ffffc02ac0597e60 RCX: 00000000ffffdfff
[    3.695216] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    3.695317] RBP: ffffc02ac0597988 R08: ffffffffa7b56a28 R09: 00000000ffffdfff
[    3.695416] R10: ffffffffa7a76a40 R11: ffffffffa7b26a40 R12: dead000000000122
[    3.695517] R13: 00000000fffb7a0f R14: 0000000000000001 R15: ffffa064432ec000
[    3.695618] FS:  000000000ae3c3c0(0000) GS:ffffa064d6ae6000(0000) knlGS:0000000000000000
[    3.695725] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.695815] CR2: 00007f41336b2000 CR3: 0000000004582005 CR4: 0000000000772ef0
[    3.695916] PKRU: 55555554
[    3.695974] Call Trace:
[    3.696031]  <TASK>
[    3.696085]  netdev_run_todo+0x21a/0x550
[    3.696160]  ? __tun_detach+0x2ed/0x490
[    3.696230]  tun_chr_close+0x47/0xa0
[    3.696297]  __fput+0xda/0x290
[    3.696368]  __x64_sys_close+0x3d/0x80
[    3.696433]  do_syscall_64+0xa4/0xfd0
[    3.696504]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    3.696589] RIP: 0033:0x4901eb
[    3.696658] 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
[    3.696852] RSP: 002b:00007ffc77d35320 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    3.696953] RAX: ffffffffffffffda RBX: 00007ffc77d35878 RCX: 00000000004901eb
[    3.697061] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    3.697162] RBP: 00007ffc77d35360 R08: 0000000000000000 R09: 0000000000000000
[    3.697261] R10: 000000000ae43540 R11: 0000000000000293 R12: 00007ffc77d357f8
[    3.697361] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    3.697463]  </TASK>
[    3.697515] ---[ end trace 0000000000000000 ]---