[    3.383267] ------------[ cut here ]------------
[    3.383368] refcount_t: underflow; use-after-free.
[    3.383439] WARNING: CPU: 1 PID: 227 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    3.383530] Modules linked in:
[    3.383575] CPU: 1 UID: 0 PID: 227 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    3.383664] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    3.383734] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    3.383794] Code: 87 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 b1 87 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
[    3.383991] RSP: 0018:ffffc15900597e50 EFLAGS: 00010286
[    3.384054] RAX: 0000000000000000 RBX: ffffc15900597e60 RCX: 00000000ffffdfff
[    3.384134] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    3.384213] RBP: ffffc15900597988 R08: ffffffff87f56a28 R09: 00000000ffffdfff
[    3.384293] R10: ffffffff87e76a40 R11: ffffffff87f26a40 R12: dead000000000122
[    3.384366] R13: 00000000fffb78d4 R14: 0000000000000001 R15: ffff9cd8812c4000
[    3.384441] FS:  000000003ce403c0(0000) GS:ffff9cd936666000(0000) knlGS:0000000000000000
[    3.384520] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.384586] CR2: 00007fd9cd9e01b4 CR3: 0000000004ef2002 CR4: 0000000000772ef0
[    3.384661] PKRU: 55555554
[    3.384691] Call Trace:
[    3.384717]  <TASK>
[    3.384747]  netdev_run_todo+0x21a/0x550
[    3.384802]  ? __tun_detach+0x2ed/0x490
[    3.384852]  tun_chr_close+0x47/0xa0
[    3.384893]  __fput+0xda/0x290
[    3.384945]  __x64_sys_close+0x3d/0x80
[    3.384994]  do_syscall_64+0xa4/0xfd0
[    3.385046]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    3.385111] RIP: 0033:0x4901eb
[    3.385155] 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
[    3.385337] RSP: 002b:00007ffe4a59c110 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    3.385429] RAX: ffffffffffffffda RBX: 00007ffe4a59c668 RCX: 00000000004901eb
[    3.385514] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    3.385597] RBP: 00007ffe4a59c150 R08: 0000000000000000 R09: 0000000000000000
[    3.385681] R10: 0000000000000004 R11: 0000000000000293 R12: 00007ffe4a59c5e8
[    3.385779] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    3.385864]  </TASK>
[    3.385889] ---[ end trace 0000000000000000 ]---