[    8.793411] ------------[ cut here ]------------
[    8.793524] refcount_t: underflow; use-after-free.
[    8.793589] WARNING: CPU: 3 PID: 228 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    8.793682] Modules linked in:
[    8.793745] CPU: 3 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    8.793836] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    8.793908] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    8.793965] Code: 90 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 91 90 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
[    8.794154] RSP: 0018:ffff9b740056fe50 EFLAGS: 00010286
[    8.794211] RAX: 0000000000000000 RBX: ffff9b740056fe60 RCX: 00000000ffffdfff
[    8.794293] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    8.794380] RBP: ffff9b740056f988 R08: ffffffff90d56a28 R09: 00000000ffffdfff
[    8.794452] R10: ffffffff90c76a40 R11: ffffffff90d26a40 R12: dead000000000122
[    8.794521] R13: 00000000fffb8df2 R14: 0000000000000001 R15: ffff8f7301f18000
[    8.794606] FS:  00000000153ae3c0(0000) GS:ffff8f73ad966000(0000) knlGS:0000000000000000
[    8.794695] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.794763] CR2: 000056495fa3c028 CR3: 00000000051ed003 CR4: 0000000000772ef0
[    8.794845] PKRU: 55555554
[    8.794872] Call Trace:
[    8.794902]  <TASK>
[    8.794926]  netdev_run_todo+0x21a/0x550
[    8.794977]  ? __tun_detach+0x2ed/0x490
[    8.795023]  tun_chr_close+0x47/0xa0
[    8.795065]  __fput+0xda/0x290
[    8.795110]  __x64_sys_close+0x3d/0x80
[    8.795152]  do_syscall_64+0xa4/0xfd0
[    8.795202]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    8.795258] RIP: 0033:0x4901eb
[    8.795300] 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
[    8.795490] RSP: 002b:00007ffd98076c40 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    8.795576] RAX: ffffffffffffffda RBX: 00007ffd98077198 RCX: 00000000004901eb
[    8.795634] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    8.795716] RBP: 00007ffd98076c80 R08: 0000000000000000 R09: 0000000000000000
[    8.795798] R10: 0000000001000000 R11: 0000000000000293 R12: 00007ffd98077118
[    8.795880] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    8.795963]  </TASK>
[    8.795989] ---[ end trace 0000000000000000 ]---