[    4.241552] ------------[ cut here ]------------
[    4.241759] refcount_t: underflow; use-after-free.
[    4.241858] WARNING: CPU: 2 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    4.241977] Modules linked in:
[    4.242054] CPU: 2 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    4.242175] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    4.242267] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    4.242347] Code: bc 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 71 bc 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
[    4.242570] RSP: 0018:ffffacda005a7e50 EFLAGS: 00010286
[    4.242651] RAX: 0000000000000000 RBX: ffffacda005a7e60 RCX: 00000000ffffdfff
[    4.242755] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    4.242858] RBP: ffffacda005a7988 R08: ffffffffbcb56a28 R09: 00000000ffffdfff
[    4.242961] R10: ffffffffbca76a40 R11: ffffffffbcb26a40 R12: dead000000000122
[    4.243060] R13: 00000000fffb7c32 R14: 0000000000000001 R15: ffff9c3785a58000
[    4.243163] FS:  0000000015b2a3c0(0000) GS:ffff9c3801ae6000(0000) knlGS:0000000000000000
[    4.243269] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.243360] CR2: 00007f0bbddee000 CR3: 0000000005898006 CR4: 0000000000772ef0
[    4.243462] PKRU: 55555554
[    4.243519] Call Trace:
[    4.243574]  <TASK>
[    4.243627]  netdev_run_todo+0x21a/0x550
[    4.243703]  ? __tun_detach+0x2ed/0x490
[    4.243774]  tun_chr_close+0x47/0xa0
[    4.243840]  __fput+0xda/0x290
[    4.243910]  __x64_sys_close+0x3d/0x80
[    4.243977]  do_syscall_64+0xa4/0xfd0
[    4.244049]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    4.244131] RIP: 0033:0x4901eb
[    4.244199] 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
[    4.244402] RSP: 002b:00007ffc4f492b00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    4.244511] RAX: ffffffffffffffda RBX: 00007ffc4f493058 RCX: 00000000004901eb
[    4.244611] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    4.244714] RBP: 00007ffc4f492b40 R08: 0000000000000000 R09: 0000000000000000
[    4.244819] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffc4f492fd8
[    4.244922] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    4.245024]  </TASK>
[    4.245077] ---[ end trace 0000000000000000 ]---