[    2.622800] ------------[ cut here ]------------
[    2.622961] refcount_t: underflow; use-after-free.
[    2.623047] WARNING: CPU: 2 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.623135] Modules linked in:
[    2.623191] CPU: 2 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.623291] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.623368] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.623435] Code: a5 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 d1 a5 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
[    2.623585] RSP: 0018:ffffb09d80413e50 EFLAGS: 00010286
[    2.623655] RAX: 0000000000000000 RBX: ffffb09d80413e60 RCX: 00000000ffffdfff
[    2.623749] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.623857] RBP: ffffb09d80413988 R08: ffffffffa6156a28 R09: 00000000ffffdfff
[    2.623952] R10: ffffffffa6076a40 R11: ffffffffa6126a40 R12: dead000000000122
[    2.624039] R13: 00000000fffb75de R14: 0000000000000001 R15: ffff9e9a81d54000
[    2.624128] FS:  000000001938a3c0(0000) GS:ffff9e9b184e6000(0000) knlGS:0000000000000000
[    2.624213] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.624288] CR2: 00007f1d7802b000 CR3: 0000000004154004 CR4: 0000000000772ef0
[    2.624409] PKRU: 55555554
[    2.624475] Call Trace:
[    2.624534]  <TASK>
[    2.624581]  netdev_run_todo+0x21a/0x550
[    2.624643]  ? __tun_detach+0x2ed/0x490
[    2.624709]  tun_chr_close+0x47/0xa0
[    2.624771]  __fput+0xda/0x290
[    2.624839]  __x64_sys_close+0x3d/0x80
[    2.624900]  do_syscall_64+0xa4/0xfd0
[    2.624963]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.625036] RIP: 0033:0x4901eb
[    2.625099] 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
[    2.625262] RSP: 002b:00007ffe9cfdd830 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.625354] RAX: ffffffffffffffda RBX: 00007ffe9cfddd88 RCX: 00000000004901eb
[    2.625435] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.625515] RBP: 00007ffe9cfdd870 R08: 0000000000000000 R09: 0000000000000000
[    2.625598] R10: 0000000000000080 R11: 0000000000000293 R12: 00007ffe9cfddd08
[    2.625688] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.625783]  </TASK>
[    2.625831] ---[ end trace 0000000000000000 ]---