[ 16.545900][ T232] ==================================================================
[ 16.546199][ T232] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 16.546456][ T232] Read of size 1 at addr ffff88800b94468c by task packetdrill/232
[ 16.546711][ T232]
[ 16.546802][ T232] CPU: 0 UID: 0 PID: 232 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.546807][ T232] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.546812][ T232] Call Trace:
[ 16.546815][ T232]
[ 16.546817][ T232] dump_stack_lvl+0x82/0xc0
[ 16.546827][ T232] print_address_description.constprop.0+0x2c/0x3a0
[ 16.546845][ T232] ? kobject_put+0xbb/0xd0
[ 16.546849][ T232] print_report+0xb4/0x270
[ 16.546852][ T232] ? kobject_put+0xbb/0xd0
[ 16.546855][ T232] ? kasan_addr_to_slab+0x21/0x70
[ 16.546858][ T232] ? kobject_put+0xbb/0xd0
[ 16.546862][ T232] kasan_report+0xca/0x100
[ 16.546866][ T232] ? kobject_put+0xbb/0xd0
[ 16.546871][ T232] kobject_put+0xbb/0xd0
[ 16.546874][ T232] netdev_run_todo+0x5f0/0xc60
[ 16.546884][ T232] ? rtnl_is_locked+0x15/0x20
[ 16.546890][ T232] ? netif_state_change+0x228/0x2c0
[ 16.546893][ T232] ? call_netdevice_notifiers_info+0x100/0x100
[ 16.546896][ T232] ? generic_xdp_install+0x410/0x410
[ 16.546902][ T232] ? tun_chr_close+0xae/0x1c0
[ 16.546916][ T232] tun_chr_close+0xc0/0x1c0
[ 16.546920][ T232] __fput+0x35c/0xa70
[ 16.546930][ T232] fput_close_sync+0xdd/0x1b0
[ 16.546934][ T232] ? alloc_file_clone+0xf0/0xf0
[ 16.546939][ T232] __x64_sys_close+0x7d/0xd0
[ 16.546943][ T232] do_syscall_64+0xc1/0xfd0
[ 16.546951][ T232] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.546957][ T232] RIP: 0033:0x4901eb
[ 16.546961][ T232] 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
[ 16.546964][ T232] RSP: 002b:00007ffdbc6f6d00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 16.546971][ T232] RAX: ffffffffffffffda RBX: 00007ffdbc6f7260 RCX: 00000000004901eb
[ 16.546974][ T232] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 16.546976][ T232] RBP: 00007ffdbc6f6d40 R08: 0000000000000000 R09: 0000000000000000
[ 16.546977][ T232] R10: 00000000388d3ee0 R11: 0000000000000293 R12: 00007ffdbc6f71d8
[ 16.546979][ T232] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 16.546985][ T232]
[ 16.546987][ T232]
[ 16.553905][ T232] The buggy address belongs to the physical page:
[ 16.554125][ T232] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800b947bc0 pfn:0xb944
[ 16.554476][ T232] flags: 0x80000000000000(node=0|zone=1)
[ 16.554655][ T232] raw: 0080000000000000 ffffea00004a8d08 ffff88803623bc40 0000000000000000
[ 16.554968][ T232] raw: ffff88800b947bc0 0000000000000000 00000000ffffffff 0000000000000000
[ 16.555262][ T232] page dumped because: kasan: bad access detected
[ 16.555473][ T232]
[ 16.555560][ T232] Memory state around the buggy address:
[ 16.555728][ T232] ffff88800b944580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.555982][ T232] ffff88800b944600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.556224][ T232] >ffff88800b944680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.556483][ T232] ^
[ 16.556608][ T232] ffff88800b944700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.556856][ T232] ffff88800b944780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 16.557100][ T232] ==================================================================
[ 16.557382][ T232] Disabling lock debugging due to kernel taint
[ 16.557594][ T232] ------------[ cut here ]------------
[ 16.557756][ T232] refcount_t: underflow; use-after-free.
[ 16.558001][ T232] WARNING: CPU: 0 PID: 232 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 16.558327][ T232] Modules linked in:
[ 16.558462][ T232] CPU: 0 UID: 0 PID: 232 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 16.558846][ T232] Tainted: [B]=BAD_PAGE
[ 16.558973][ T232] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 16.559186][ T232] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 16.559410][ T232] Code: 3f 92 02 80 fb 01 0f 87 bb b9 d9 fe 83 e3 01 0f 85 51 ff ff ff c6 05 5e 3f 92 02 01 90 48 c7 c7 20 8d 45 a0 e8 32 bf 18 ff 90 <0f> 0b 90 90 e9 33 ff ff ff 48 89 df e8 b0 63 a1 ff e9 ba fe ff ff
[ 16.560009][ T232] RSP: 0018:ffffc90000ae7ce8 EFLAGS: 00010282
[ 16.560219][ T232] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 16.560468][ T232] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 16.560717][ T232] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff41be134
[ 16.560975][ T232] R10: 0000000000000003 R11: ffffc90000ae7880 R12: 0000000000000001
[ 16.561222][ T232] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 16.561477][ T232] FS: 00000000388cc3c0(0000) GS:ffff88809401a000(0000) knlGS:0000000000000000
[ 16.561765][ T232] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 16.561979][ T232] CR2: 00007f1577520a20 CR3: 000000000a7e2005 CR4: 0000000000772ef0
[ 16.562239][ T232] PKRU: 55555554
[ 16.562369][ T232] Call Trace:
[ 16.562498][ T232]
[ 16.562583][ T232] netdev_run_todo+0x5f0/0xc60
[ 16.562757][ T232] ? rtnl_is_locked+0x15/0x20
[ 16.562934][ T232] ? netif_state_change+0x228/0x2c0
[ 16.563097][ T232] ? call_netdevice_notifiers_info+0x100/0x100
[ 16.563300][ T232] ? generic_xdp_install+0x410/0x410
[ 16.563468][ T232] ? tun_chr_close+0xae/0x1c0
[ 16.563635][ T232] tun_chr_close+0xc0/0x1c0
[ 16.563797][ T232] __fput+0x35c/0xa70
[ 16.563931][ T232] fput_close_sync+0xdd/0x1b0
[ 16.564094][ T232] ? alloc_file_clone+0xf0/0xf0
[ 16.564260][ T232] __x64_sys_close+0x7d/0xd0
[ 16.564428][ T232] do_syscall_64+0xc1/0xfd0
[ 16.564594][ T232] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 16.564802][ T232] RIP: 0033:0x4901eb
[ 16.564939][ T232] 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
[ 16.565544][ T232] RSP: 002b:00007ffdbc6f6d00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 16.565795][ T232] RAX: ffffffffffffffda RBX: 00007ffdbc6f7260 RCX: 00000000004901eb
[ 16.566047][ T232] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 16.566302][ T232] RBP: 00007ffdbc6f6d40 R08: 0000000000000000 R09: 0000000000000000
[ 16.566556][ T232] R10: 00000000388d3ee0 R11: 0000000000000293 R12: 00007ffdbc6f71d8
[ 16.566806][ T232] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 16.567066][ T232]
[ 16.567190][ T232] irq event stamp: 2104395
[ 16.567368][ T232] hardirqs last enabled at (2104395): [] irqentry_exit+0x3b/0x80
[ 16.567658][ T232] hardirqs last disabled at (2104394): [] handle_softirqs+0x47f/0x610
[ 16.567962][ T232] softirqs last enabled at (2104294): [] handle_softirqs+0x352/0x610
[ 16.568247][ T232] softirqs last disabled at (2104287): [] irq_exit_rcu+0xab/0x100
[ 16.568540][ T232] ---[ end trace 0000000000000000 ]---