[    4.832023] ------------[ cut here ]------------
[    4.832127] refcount_t: underflow; use-after-free.
[    4.832201] WARNING: CPU: 2 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    4.832279] Modules linked in:
[    4.832334] CPU: 2 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    4.832413] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    4.832479] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    4.832534] Code: 89 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 89 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
[    4.832679] RSP: 0018:ffffbe9a00567e50 EFLAGS: 00010286
[    4.832734] RAX: 0000000000000000 RBX: ffffbe9a00567e60 RCX: 00000000ffffdfff
[    4.832805] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    4.832875] RBP: ffffbe9a00567988 R08: ffffffff89956a28 R09: 00000000ffffdfff
[    4.832950] R10: ffffffff89876a40 R11: ffffffff89926a40 R12: dead000000000122
[    4.833035] R13: 00000000fffb7e85 R14: 0000000000000001 R15: ffff98b044e24000
[    4.833106] FS:  00000000087f63c0(0000) GS:ffff98b0f4ce6000(0000) knlGS:0000000000000000
[    4.833177] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    4.833238] CR2: 000055d7576b1028 CR3: 0000000004df4003 CR4: 0000000000772ef0
[    4.833327] PKRU: 55555554
[    4.833366] Call Trace:
[    4.833405]  <TASK>
[    4.833444]  netdev_run_todo+0x21a/0x550
[    4.833497]  ? __tun_detach+0x2ed/0x490
[    4.833546]  tun_chr_close+0x47/0xa0
[    4.833603]  __fput+0xda/0x290
[    4.833654]  __x64_sys_close+0x3d/0x80
[    4.833703]  do_syscall_64+0xa4/0xfd0
[    4.833760]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    4.833823] RIP: 0033:0x4901eb
[    4.833873] 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
[    4.834026] RSP: 002b:00007fff3c8a1d10 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    4.834097] RAX: ffffffffffffffda RBX: 00007fff3c8a2268 RCX: 00000000004901eb
[    4.834166] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    4.834234] RBP: 00007fff3c8a1d50 R08: 0000000000000000 R09: 0000000000000000
[    4.834303] R10: 0000000001000000 R11: 0000000000000293 R12: 00007fff3c8a21e8
[    4.834372] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    4.834441]  </TASK>
[    4.834480] ---[ end trace 0000000000000000 ]---