[    4.961563] ------------[ cut here ]------------
[    4.961740] refcount_t: underflow; use-after-free.
[    4.961830] WARNING: CPU: 2 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    4.961933] Modules linked in:
[    4.961995] CPU: 2 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    4.962096] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    4.962178] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    4.962248] 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 71 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
[    4.962429] RSP: 0018:ffffaa4200557e50 EFLAGS: 00010286
[    4.962511] RAX: 0000000000000000 RBX: ffffaa4200557e60 RCX: 00000000ffffdfff
[    4.962604] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    4.962699] RBP: ffffaa4200557988 R08: ffffffff87b56a28 R09: 00000000ffffdfff
[    4.962791] R10: ffffffff87a76a40 R11: ffffffff87b26a40 R12: dead000000000122
[    4.962883] R13: 00000000fffb7ef5 R14: 0000000000000001 R15: ffff94cfc3b5c000
[    4.962975] FS:  000000003c68b3c0(0000) GS:ffff94d076ae6000(0000) knlGS:0000000000000000
[    4.963069] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.963151] CR2: 00007ff073b74000 CR3: 00000000059af003 CR4: 0000000000772ef0
[    4.963249] PKRU: 55555554
[    4.963298] Call Trace:
[    4.963346]  <TASK>
[    4.963392]  netdev_run_todo+0x21a/0x550
[    4.963458]  ? __tun_detach+0x2ed/0x490
[    4.963524]  tun_chr_close+0x47/0xa0
[    4.963588]  __fput+0xda/0x290
[    4.963657]  __x64_sys_close+0x3d/0x80
[    4.963720]  do_syscall_64+0xa4/0xfd0
[    4.963784]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    4.963858] RIP: 0033:0x4901eb
[    4.963925] 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
[    4.964112] RSP: 002b:00007ffee34e0210 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    4.964206] RAX: ffffffffffffffda RBX: 00007ffee34e0768 RCX: 00000000004901eb
[    4.964298] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    4.964390] RBP: 00007ffee34e0250 R08: 0000000000000000 R09: 0000000000000000
[    4.964490] R10: 0000000000000010 R11: 0000000000000293 R12: 00007ffee34e06e8
[    4.964588] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    4.964688]  </TASK>
[    4.964736] ---[ end trace 0000000000000000 ]---