[    2.460741] ------------[ cut here ]------------
[    2.460889] refcount_t: underflow; use-after-free.
[    2.460953] WARNING: CPU: 3 PID: 229 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    2.461048] Modules linked in:
[    2.461096] CPU: 3 UID: 0 PID: 229 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    2.461191] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.461258] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    2.461315] Code: 9b 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 31 9b 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
[    2.461507] RSP: 0018:ffffa244c055fe50 EFLAGS: 00010286
[    2.461566] RAX: 0000000000000000 RBX: ffffa244c055fe60 RCX: 00000000ffffdfff
[    2.461643] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.461728] RBP: ffffa244c055f988 R08: ffffffff9b756a28 R09: 00000000ffffdfff
[    2.461810] R10: ffffffff9b676a40 R11: ffffffff9b726a40 R12: dead000000000122
[    2.461888] R13: 00000000fffb7537 R14: 0000000000000001 R15: ffff9407c1f54000
[    2.461968] FS:  0000000014e853c0(0000) GS:ffff940862f66000(0000) knlGS:0000000000000000
[    2.462050] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.462113] CR2: 00007f5ab3fdc000 CR3: 00000000039ce003 CR4: 0000000000772ef0
[    2.462191] PKRU: 55555554
[    2.462217] Call Trace:
[    2.462244]  <TASK>
[    2.462276]  netdev_run_todo+0x21a/0x550
[    2.462325]  ? __tun_detach+0x2ed/0x490
[    2.462370]  tun_chr_close+0x47/0xa0
[    2.462409]  __fput+0xda/0x290
[    2.462455]  __x64_sys_close+0x3d/0x80
[    2.462493]  do_syscall_64+0xa4/0xfd0
[    2.462532]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    2.462591] RIP: 0033:0x4901eb
[    2.462630] 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
[    2.462810] RSP: 002b:00007ffc25d25230 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    2.462892] RAX: ffffffffffffffda RBX: 00007ffc25d25788 RCX: 00000000004901eb
[    2.462970] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    2.463046] RBP: 00007ffc25d25270 R08: 0000000000000000 R09: 0000000000000000
[    2.463124] R10: 0000000014e8d4c0 R11: 0000000000000293 R12: 00007ffc25d25708
[    2.463201] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    2.463280]  </TASK>
[    2.463306] ---[ end trace 0000000000000000 ]---