[    2.787839] ------------[ cut here ]------------
[    2.787979] refcount_t: underflow; use-after-free.
[    2.788047] WARNING: CPU: 0 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.788115] Modules linked in:
[    2.788150] CPU: 0 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.788217] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.788268] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.788310] Code: 8d 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 8d 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
[    2.788457] RSP: 0018:ffffc1550055fe50 EFLAGS: 00010286
[    2.788504] RAX: 0000000000000000 RBX: ffffc1550055fe60 RCX: 00000000ffffdfff
[    2.788585] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.788648] RBP: ffffc1550055f988 R08: ffffffff8db56a28 R09: 00000000ffffdfff
[    2.788721] R10: ffffffff8da76a40 R11: ffffffff8db26a40 R12: dead000000000122
[    2.788781] R13: 00000000fffb7674 R14: 0000000000000001 R15: ffff9b3046e68000
[    2.788862] FS:  00000000392983c0(0000) GS:ffff9b30f09e6000(0000) knlGS:0000000000000000
[    2.788922] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.788966] CR2: 00007f2908b97000 CR3: 0000000003a57002 CR4: 0000000000772ef0
[    2.789021] PKRU: 55555554
[    2.789042] Call Trace:
[    2.789061]  <TASK>
[    2.789081]  netdev_run_todo+0x21a/0x550
[    2.789119]  ? __tun_detach+0x2ed/0x490
[    2.789153]  tun_chr_close+0x47/0xa0
[    2.789185]  __fput+0xda/0x290
[    2.789221]  __x64_sys_close+0x3d/0x80
[    2.789260]  do_syscall_64+0xa4/0xfd0
[    2.789318]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.789369] RIP: 0033:0x4901eb
[    2.789429] 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
[    2.789596] RSP: 002b:00007ffce68ffbd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.789650] RAX: ffffffffffffffda RBX: 00007ffce6900128 RCX: 00000000004901eb
[    2.789734] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.789792] RBP: 00007ffce68ffc10 R08: 0000000000000000 R09: 0000000000000000
[    2.789872] R10: 0000000000000007 R11: 0000000000000293 R12: 00007ffce69000a8
[    2.789926] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.790028]  </TASK>
[    2.790051] ---[ end trace 0000000000000000 ]---