[    2.938682] ------------[ cut here ]------------
[    2.938885] refcount_t: underflow; use-after-free.
[    2.938977] WARNING: CPU: 2 PID: 228 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.939106] Modules linked in:
[    2.939168] CPU: 2 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.939253] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.939324] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.939429] 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 51 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
[    2.939643] RSP: 0018:ffffa3c0c058fe50 EFLAGS: 00010286
[    2.939734] RAX: 0000000000000000 RBX: ffffa3c0c058fe60 RCX: 00000000ffffdfff
[    2.939831] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.939911] RBP: ffffa3c0c058f988 R08: ffffffff87956a28 R09: 00000000ffffdfff
[    2.939996] R10: ffffffff87876a40 R11: ffffffff87926a40 R12: dead000000000122
[    2.940093] R13: 00000000fffb7717 R14: 0000000000000001 R15: ffff8b84c3100000
[    2.940181] FS:  00000000278303c0(0000) GS:ffff8b8576ce6000(0000) knlGS:0000000000000000
[    2.940262] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.940333] CR2: 00007fae01381000 CR3: 00000000048e2003 CR4: 0000000000772ef0
[    2.940471] PKRU: 55555554
[    2.940524] Call Trace:
[    2.940578]  <TASK>
[    2.940636]  netdev_run_todo+0x21a/0x550
[    2.940721]  ? __tun_detach+0x2ed/0x490
[    2.940783]  tun_chr_close+0x47/0xa0
[    2.940838]  __fput+0xda/0x290
[    2.940897]  __x64_sys_close+0x3d/0x80
[    2.940952]  do_syscall_64+0xa4/0xfd0
[    2.941020]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.941092] RIP: 0033:0x4901eb
[    2.941155] 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
[    2.941300] RSP: 002b:00007ffeff0ae770 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.941384] RAX: ffffffffffffffda RBX: 00007ffeff0aecc8 RCX: 00000000004901eb
[    2.941483] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.941569] RBP: 00007ffeff0ae7b0 R08: 0000000000000000 R09: 0000000000000000
[    2.941651] R10: 0000000001000000 R11: 0000000000000293 R12: 00007ffeff0aec48
[    2.941727] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.941809]  </TASK>
[    2.941861] ---[ end trace 0000000000000000 ]---