[    3.235822] ------------[ cut here ]------------
[    3.235978] refcount_t: underflow; use-after-free.
[    3.236063] WARNING: CPU: 2 PID: 228 at lib/refcount.c:28 refcount_warn_saturate+0xbc/0x110
[    3.236169] Modules linked in:
[    3.236231] CPU: 2 UID: 0 PID: 228 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(voluntary) 
[    3.236342] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    3.236423] RIP: 0010:refcount_warn_saturate+0xbc/0x110
[    3.236494] Code: a2 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 11 a2 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
[    3.236633] RSP: 0018:ffff995d00587e50 EFLAGS: 00010286
[    3.236704] RAX: 0000000000000000 RBX: ffff995d00587e60 RCX: 00000000ffffdfff
[    3.236799] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    3.236887] RBP: ffff995d00587988 R08: ffffffffa2556a28 R09: 00000000ffffdfff
[    3.236977] R10: ffffffffa2476a40 R11: ffffffffa2526a40 R12: dead000000000122
[    3.237070] R13: 00000000fffb783d R14: 0000000000000001 R15: ffff8a86430c4000
[    3.237173] FS:  00000000214383c0(0000) GS:ffff8a86dc0e6000(0000) knlGS:0000000000000000
[    3.237264] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.237347] CR2: 00007f77e3596000 CR3: 0000000005516001 CR4: 0000000000772ef0
[    3.237419] PKRU: 55555554
[    3.237459] Call Trace:
[    3.237499]  <TASK>
[    3.237538]  netdev_run_todo+0x21a/0x550
[    3.237591]  ? __tun_detach+0x2ed/0x490
[    3.237641]  tun_chr_close+0x47/0xa0
[    3.237696]  __fput+0xda/0x290
[    3.237748]  __x64_sys_close+0x3d/0x80
[    3.237802]  do_syscall_64+0xa4/0xfd0
[    3.237854]  entry_SYSCALL_64_after_hwframe+0x4b/0x53
[    3.237912] RIP: 0033:0x4901eb
[    3.237972] 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
[    3.238147] RSP: 002b:00007ffc6384d7d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[    3.238247] RAX: ffffffffffffffda RBX: 00007ffc6384dd28 RCX: 00000000004901eb
[    3.238345] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[    3.238439] RBP: 00007ffc6384d810 R08: 0000000000000000 R09: 0000000000000000
[    3.238528] R10: 000000002143feb0 R11: 0000000000000293 R12: 00007ffc6384dca8
[    3.238615] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[    3.238697]  </TASK>
[    3.238743] ---[ end trace 0000000000000000 ]---