[    2.841986] ------------[ cut here ]------------
[    2.842115] refcount_t: underflow; use-after-free.
[    2.842193] WARNING: CPU: 2 PID: 228 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.842341] Modules linked in:
[    2.842403] CPU: 2 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.842494] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.842576] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.842654] Code: 8e 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 8e 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
[    2.842841] RSP: 0018:ffffb6f2c0597e50 EFLAGS: 00010286
[    2.842895] RAX: 0000000000000000 RBX: ffffb6f2c0597e60 RCX: 00000000ffffdfff
[    2.843013] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.843109] RBP: ffffb6f2c0597988 R08: ffffffff8f156a28 R09: 00000000ffffdfff
[    2.843208] R10: ffffffff8f076a40 R11: ffffffff8f126a40 R12: dead000000000122
[    2.843305] R13: 00000000fffb76b9 R14: 0000000000000001 R15: ffff907bc2424000
[    2.843385] FS:  0000000013a593c0(0000) GS:ffff907c6f4e6000(0000) knlGS:0000000000000000
[    2.843460] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.843562] CR2: 00007f7a83dae000 CR3: 0000000003156006 CR4: 0000000000772ef0
[    2.843663] PKRU: 55555554
[    2.843713] Call Trace:
[    2.843764]  <TASK>
[    2.843812]  netdev_run_todo+0x21a/0x550
[    2.843881]  ? __tun_detach+0x2ed/0x490
[    2.843954]  tun_chr_close+0x47/0xa0
[    2.844015]  __fput+0xda/0x290
[    2.844081]  __x64_sys_close+0x3d/0x80
[    2.844142]  do_syscall_64+0xa4/0xfd0
[    2.844212]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.844269] RIP: 0033:0x4901eb
[    2.844334] 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
[    2.844518] RSP: 002b:00007ffc85f8dca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.844614] RAX: ffffffffffffffda RBX: 00007ffc85f8e1f8 RCX: 00000000004901eb
[    2.844716] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.844787] RBP: 00007ffc85f8dce0 R08: 0000000000000000 R09: 0000000000000000
[    2.844877] R10: 0000000013a65820 R11: 0000000000000293 R12: 00007ffc85f8e178
[    2.844975] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.845076]  </TASK>
[    2.845127] ---[ end trace 0000000000000000 ]---