[    2.165643] ------------[ cut here ]------------
[    2.165754] refcount_t: underflow; use-after-free.
[    2.165812] WARNING: CPU: 3 PID: 227 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.165875] Modules linked in:
[    2.165908] CPU: 3 UID: 0 PID: 227 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.165980] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.166021] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.166055] Code: b5 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 f1 b5 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
[    2.166184] RSP: 0018:ffffae30c0587e50 EFLAGS: 00010286
[    2.166219] RAX: 0000000000000000 RBX: ffffae30c0587e60 RCX: 00000000ffffdfff
[    2.166282] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.166332] RBP: ffffae30c0587988 R08: ffffffffb6356a28 R09: 00000000ffffdfff
[    2.166382] R10: ffffffffb6276a40 R11: ffffffffb6326a40 R12: dead000000000122
[    2.166454] R13: 00000000fffb7415 R14: 0000000000000001 R15: ffff974381f14000
[    2.166507] FS:  0000000033bb93c0(0000) GS:ffff974408366000(0000) knlGS:0000000000000000
[    2.166562] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.166613] CR2: 00007f12d6da8000 CR3: 00000000031f0002 CR4: 0000000000772ef0
[    2.166670] PKRU: 55555554
[    2.166692] Call Trace:
[    2.166719]  <TASK>
[    2.166741]  netdev_run_todo+0x21a/0x550
[    2.166779]  ? __tun_detach+0x2ed/0x490
[    2.166810]  tun_chr_close+0x47/0xa0
[    2.166841]  __fput+0xda/0x290
[    2.166872]  __x64_sys_close+0x3d/0x80
[    2.166902]  do_syscall_64+0xa4/0xfd0
[    2.166939]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.166983] RIP: 0033:0x4901eb
[    2.167018] 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
[    2.167162] RSP: 002b:00007ffc45513f00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.167219] RAX: ffffffffffffffda RBX: 00007ffc45514458 RCX: 00000000004901eb
[    2.167276] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.167339] RBP: 00007ffc45513f40 R08: 0000000000000000 R09: 0000000000000000
[    2.167400] R10: 0000000000000020 R11: 0000000000000293 R12: 00007ffc455143d8
[    2.167455] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.167506]  </TASK>
[    2.167529] ---[ end trace 0000000000000000 ]---