[    3.281499] ------------[ cut here ]------------
[    3.281613] refcount_t: underflow; use-after-free.
[    3.281669] WARNING: CPU: 3 PID: 227 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    3.281739] Modules linked in:
[    3.281771] CPU: 3 UID: 0 PID: 227 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    3.281839] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    3.281890] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    3.281934] Code: 99 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 31 99 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
[    3.282054] RSP: 0018:ffffb7f7c05bfe50 EFLAGS: 00010286
[    3.282087] RAX: 0000000000000000 RBX: ffffb7f7c05bfe60 RCX: 00000000ffffdfff
[    3.282139] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    3.282204] RBP: ffffb7f7c05bf988 R08: ffffffff99756a28 R09: 00000000ffffdfff
[    3.282253] R10: ffffffff99676a40 R11: ffffffff99726a40 R12: dead000000000122
[    3.282303] R13: 00000000fffb786b R14: 0000000000000001 R15: ffff8aad02d10000
[    3.282358] FS:  000000004020f3c0(0000) GS:ffff8aada4f66000(0000) knlGS:0000000000000000
[    3.282423] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.282479] CR2: 00007fa1d8dae1b4 CR3: 0000000001b2d002 CR4: 0000000000772ef0
[    3.282533] PKRU: 55555554
[    3.282548] Call Trace:
[    3.282568]  <TASK>
[    3.282589]  netdev_run_todo+0x21a/0x550
[    3.282629]  ? __tun_detach+0x2ed/0x490
[    3.282664]  tun_chr_close+0x47/0xa0
[    3.282703]  __fput+0xda/0x290
[    3.282743]  __x64_sys_close+0x3d/0x80
[    3.282777]  do_syscall_64+0xa4/0xfd0
[    3.282814]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    3.282851] RIP: 0033:0x4901eb
[    3.282883] 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
[    3.283003] RSP: 002b:00007ffd3b7f2be0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    3.283058] RAX: ffffffffffffffda RBX: 00007ffd3b7f3138 RCX: 00000000004901eb
[    3.283107] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    3.283160] RBP: 00007ffd3b7f2c20 R08: 0000000000000000 R09: 0000000000000000
[    3.283214] R10: 0000000000000004 R11: 0000000000000293 R12: 00007ffd3b7f30b8
[    3.283269] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    3.283325]  </TASK>
[    3.283340] ---[ end trace 0000000000000000 ]---