[    2.624475] ------------[ cut here ]------------
[    2.624631] refcount_t: underflow; use-after-free.
[    2.624695] WARNING: CPU: 0 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.624787] Modules linked in:
[    2.624827] CPU: 0 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.624922] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.624986] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.625039] Code: 8c 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 8c 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
[    2.625220] RSP: 0018:ffffabaac05cfe50 EFLAGS: 00010286
[    2.625273] RAX: 0000000000000000 RBX: ffffabaac05cfe60 RCX: 00000000ffffdfff
[    2.625355] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.625441] RBP: ffffabaac05cf988 R08: ffffffff8d356a28 R09: 00000000ffffdfff
[    2.625531] R10: ffffffff8d276a40 R11: ffffffff8d326a40 R12: dead000000000122
[    2.625610] R13: 00000000fffb75d0 R14: 0000000000000001 R15: ffff9cd044898000
[    2.625691] FS:  00000000019ae3c0(0000) GS:ffff9cd0f11e6000(0000) knlGS:0000000000000000
[    2.625769] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.625834] CR2: 00007f3073dad000 CR3: 00000000049a6002 CR4: 0000000000772ef0
[    2.625915] PKRU: 55555554
[    2.625947] Call Trace:
[    2.625975]  <TASK>
[    2.625999]  netdev_run_todo+0x21a/0x550
[    2.626050]  ? __tun_detach+0x2ed/0x490
[    2.626103]  tun_chr_close+0x47/0xa0
[    2.626144]  __fput+0xda/0x290
[    2.626193]  __x64_sys_close+0x3d/0x80
[    2.626232]  do_syscall_64+0xa4/0xfd0
[    2.626285]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.626339] RIP: 0033:0x4901eb
[    2.626379] 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
[    2.626566] RSP: 002b:00007ffe0677cf30 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.626650] RAX: ffffffffffffffda RBX: 00007ffe0677d488 RCX: 00000000004901eb
[    2.626728] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.626806] RBP: 00007ffe0677cf70 R08: 0000000000000000 R09: 0000000000000000
[    2.626885] R10: 0000000000000080 R11: 0000000000000293 R12: 00007ffe0677d408
[    2.626963] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.627045]  </TASK>
[    2.627078] ---[ end trace 0000000000000000 ]---