[    6.596904] ------------[ cut here ]------------
[    6.597050] refcount_t: underflow; use-after-free.
[    6.597138] WARNING: CPU: 3 PID: 228 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    6.597243] Modules linked in:
[    6.597287] CPU: 3 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    6.597397] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    6.597469] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    6.597532] Code: 83 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 83 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
[    6.597729] RSP: 0018:ffffb2e9c055fe50 EFLAGS: 00010286
[    6.597787] RAX: 0000000000000000 RBX: ffffb2e9c055fe60 RCX: 00000000ffffdfff
[    6.597876] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    6.597965] RBP: ffffb2e9c055f988 R08: ffffffff83d56a28 R09: 00000000ffffdfff
[    6.598055] R10: ffffffff83c76a40 R11: ffffffff83d26a40 R12: dead000000000122
[    6.598136] R13: 00000000fffb8565 R14: 0000000000000001 R15: ffff94f9432bc000
[    6.598216] FS:  00000000084643c0(0000) GS:ffff94f9fa966000(0000) knlGS:0000000000000000
[    6.598304] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    6.598371] CR2: 000056102c40f008 CR3: 0000000005284001 CR4: 0000000000772ef0
[    6.598452] PKRU: 55555554
[    6.598478] Call Trace:
[    6.598509]  <TASK>
[    6.598543]  netdev_run_todo+0x21a/0x550
[    6.598600]  ? __tun_detach+0x2ed/0x490
[    6.598648]  tun_chr_close+0x47/0xa0
[    6.598689]  __fput+0xda/0x290
[    6.598742]  __x64_sys_close+0x3d/0x80
[    6.598791]  do_syscall_64+0xa4/0xfd0
[    6.598848]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    6.598918] RIP: 0033:0x4901eb
[    6.598966] 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
[    6.599164] RSP: 002b:00007ffcbc087180 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    6.599246] RAX: ffffffffffffffda RBX: 00007ffcbc0876d8 RCX: 00000000004901eb
[    6.599327] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    6.599408] RBP: 00007ffcbc0871c0 R08: 0000000000000000 R09: 0000000000000000
[    6.599491] R10: 000000000846b140 R11: 0000000000000293 R12: 00007ffcbc087658
[    6.599571] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    6.599655]  </TASK>
[    6.599681] ---[ end trace 0000000000000000 ]---