[    8.503834] ------------[ cut here ]------------
[    8.503925] refcount_t: underflow; use-after-free.
[    8.503978] WARNING: CPU: 3 PID: 228 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    8.504041] Modules linked in:
[    8.504074] CPU: 3 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    8.504138] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.504185] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    8.504219] Code: a2 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 d1 a2 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
[    8.504356] RSP: 0018:ffffa2f30059fe50 EFLAGS: 00010286
[    8.504395] RAX: 0000000000000000 RBX: ffffa2f30059fe60 RCX: 00000000ffffdfff
[    8.504445] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    8.504495] RBP: ffffa2f30059f988 R08: ffffffffa3156a28 R09: 00000000ffffdfff
[    8.504544] R10: ffffffffa3076a40 R11: ffffffffa3126a40 R12: dead000000000122
[    8.504595] R13: 00000000fffb8cda R14: 0000000000000001 R15: ffff949bc1f98000
[    8.504646] FS:  000000000aece3c0(0000) GS:ffff949c5b566000(0000) knlGS:0000000000000000
[    8.504702] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.504747] CR2: 00007f87a5a27199 CR3: 00000000035cf001 CR4: 0000000000772ef0
[    8.504798] PKRU: 55555554
[    8.504829] Call Trace:
[    8.504848]  <TASK>
[    8.504868]  netdev_run_todo+0x21a/0x550
[    8.504906]  ? __tun_detach+0x2ed/0x490
[    8.504940]  tun_chr_close+0x47/0xa0
[    8.504971]  __fput+0xda/0x290
[    8.505006]  __x64_sys_close+0x3d/0x80
[    8.505036]  do_syscall_64+0xa4/0xfd0
[    8.505071]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    8.505110] RIP: 0033:0x4901eb
[    8.505141] 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
[    8.505262] RSP: 002b:00007ffe0d44e9c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    8.505323] RAX: ffffffffffffffda RBX: 00007ffe0d44ef18 RCX: 00000000004901eb
[    8.505373] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    8.505423] RBP: 00007ffe0d44ea00 R08: 0000000000000000 R09: 0000000000000000
[    8.505479] R10: 0000000001000000 R11: 0000000000000293 R12: 00007ffe0d44ee98
[    8.505530] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    8.505581]  </TASK>
[    8.505603] ---[ end trace 0000000000000000 ]---