[ 22.930247][ T230] ==================================================================
[ 22.930580][ T230] BUG: KASAN: use-after-free in kobject_put+0xbb/0xd0
[ 22.930806][ T230] Read of size 1 at addr ffff888009e6c68c by task packetdrill/230
[ 22.931057][ T230]
[ 22.931141][ T230] CPU: 0 UID: 0 PID: 230 Comm: packetdrill Not tainted 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 22.931147][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 22.931150][ T230] Call Trace:
[ 22.931152][ T230]
[ 22.931154][ T230] dump_stack_lvl+0x82/0xc0
[ 22.931160][ T230] print_address_description.constprop.0+0x2c/0x3a0
[ 22.931168][ T230] ? kobject_put+0xbb/0xd0
[ 22.931172][ T230] print_report+0xb4/0x270
[ 22.931176][ T230] ? kobject_put+0xbb/0xd0
[ 22.931179][ T230] ? kasan_addr_to_slab+0x21/0x70
[ 22.931183][ T230] ? kobject_put+0xbb/0xd0
[ 22.931186][ T230] kasan_report+0xca/0x100
[ 22.931190][ T230] ? kobject_put+0xbb/0xd0
[ 22.931195][ T230] kobject_put+0xbb/0xd0
[ 22.931199][ T230] netdev_run_todo+0x5f0/0xc60
[ 22.931204][ T230] ? rtnl_is_locked+0x15/0x20
[ 22.931209][ T230] ? netif_state_change+0x228/0x2c0
[ 22.931212][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 22.931215][ T230] ? generic_xdp_install+0x410/0x410
[ 22.931219][ T230] ? tun_chr_close+0xae/0x1c0
[ 22.931226][ T230] tun_chr_close+0xc0/0x1c0
[ 22.931230][ T230] __fput+0x35c/0xa70
[ 22.931238][ T230] fput_close_sync+0xdd/0x1b0
[ 22.931242][ T230] ? alloc_file_clone+0xf0/0xf0
[ 22.931247][ T230] __x64_sys_close+0x7d/0xd0
[ 22.931250][ T230] do_syscall_64+0xc1/0xfd0
[ 22.931257][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 22.931262][ T230] RIP: 0033:0x4901eb
[ 22.931267][ T230] 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
[ 22.931270][ T230] RSP: 002b:00007ffdefbb1210 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 22.931274][ T230] RAX: ffffffffffffffda RBX: 00007ffdefbb1770 RCX: 00000000004901eb
[ 22.931276][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 22.931278][ T230] RBP: 00007ffdefbb1250 R08: 0000000000000000 R09: 0000000000000000
[ 22.931280][ T230] R10: 0000000001000000 R11: 0000000000000293 R12: 00007ffdefbb16e8
[ 22.931282][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 22.931288][ T230]
[ 22.931290][ T230]
[ 22.937849][ T230] The buggy address belongs to the physical page:
[ 22.938045][ T230] page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x9e6c
[ 22.938326][ T230] flags: 0x80000000000000(node=0|zone=1)
[ 22.938492][ T230] raw: 0080000000000000 ffffea000024e408 ffff88803623bc40 0000000000000000
[ 22.938774][ T230] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
[ 22.939058][ T230] page dumped because: kasan: bad access detected
[ 22.939252][ T230]
[ 22.939331][ T230] Memory state around the buggy address:
[ 22.939485][ T230] ffff888009e6c580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 22.939717][ T230] ffff888009e6c600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 22.939947][ T230] >ffff888009e6c680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 22.940175][ T230] ^
[ 22.940289][ T230] ffff888009e6c700: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 22.940513][ T230] ffff888009e6c780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 22.940735][ T230] ==================================================================
[ 22.941010][ T230] Disabling lock debugging due to kernel taint
[ 22.941221][ T230] ------------[ cut here ]------------
[ 22.941366][ T230] refcount_t: underflow; use-after-free.
[ 22.941705][ T230] WARNING: CPU: 0 PID: 230 at lib/refcount.c:28 refcount_warn_saturate+0x16f/0x1b0
[ 22.941992][ T230] Modules linked in:
[ 22.942120][ T230] CPU: 0 UID: 0 PID: 230 Comm: packetdrill Tainted: G B 6.18.0-rc4-virtme #1 PREEMPT(full)
[ 22.942481][ T230] Tainted: [B]=BAD_PAGE
[ 22.942601][ T230] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 22.942806][ T230] RIP: 0010:refcount_warn_saturate+0x16f/0x1b0
[ 22.943016][ T230] 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 05 a5 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
[ 22.943573][ T230] RSP: 0018:ffffc90000b17ce8 EFLAGS: 00010282
[ 22.943773][ T230] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 22.943998][ T230] RDX: 0000000000000002 RSI: 0000000000000004 RDI: 0000000000000001
[ 22.944230][ T230] RBP: 0000000000000003 R08: 0000000000000000 R09: fffffbfff4b3e134
[ 22.944469][ T230] R10: 0000000000000003 R11: ffffc90000b17880 R12: 0000000000000001
[ 22.944697][ T230] R13: dffffc0000000000 R14: dead000000000122 R15: dead000000000100
[ 22.944922][ T230] FS: 00000000169943c0(0000) GS:ffff88808f41a000(0000) knlGS:0000000000000000
[ 22.945184][ T230] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 22.945381][ T230] CR2: 00007fb139232000 CR3: 00000000094d9001 CR4: 0000000000772ef0
[ 22.945617][ T230] PKRU: 55555554
[ 22.945734][ T230] Call Trace:
[ 22.945849][ T230]
[ 22.945928][ T230] netdev_run_todo+0x5f0/0xc60
[ 22.946086][ T230] ? rtnl_is_locked+0x15/0x20
[ 22.946239][ T230] ? netif_state_change+0x228/0x2c0
[ 22.946408][ T230] ? call_netdevice_notifiers_info+0x100/0x100
[ 22.946605][ T230] ? generic_xdp_install+0x410/0x410
[ 22.946771][ T230] ? tun_chr_close+0xae/0x1c0
[ 22.946928][ T230] tun_chr_close+0xc0/0x1c0
[ 22.947088][ T230] __fput+0x35c/0xa70
[ 22.947209][ T230] fput_close_sync+0xdd/0x1b0
[ 22.947360][ T230] ? alloc_file_clone+0xf0/0xf0
[ 22.947517][ T230] __x64_sys_close+0x7d/0xd0
[ 22.947694][ T230] do_syscall_64+0xc1/0xfd0
[ 22.947857][ T230] entry_SYSCALL_64_after_hwframe+0x4b/0x53
[ 22.948047][ T230] RIP: 0033:0x4901eb
[ 22.948170][ T230] 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
[ 22.948722][ T230] RSP: 002b:00007ffdefbb1210 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
[ 22.948953][ T230] RAX: ffffffffffffffda RBX: 00007ffdefbb1770 RCX: 00000000004901eb
[ 22.949179][ T230] RDX: 0000000000000002 RSI: 0000000000000002 RDI: 0000000000000005
[ 22.949406][ T230] RBP: 00007ffdefbb1250 R08: 0000000000000000 R09: 0000000000000000
[ 22.949646][ T230] R10: 0000000001000000 R11: 0000000000000293 R12: 00007ffdefbb16e8
[ 22.949874][ T230] R13: 0000000000000001 R14: 000000000054e030 R15: 0000000000000001
[ 22.950107][ T230]
[ 22.950223][ T230] irq event stamp: 2043405
[ 22.950378][ T230] hardirqs last enabled at (2043405): [] irqentry_exit+0x3b/0x80
[ 22.950646][ T230] hardirqs last disabled at (2043404): [] handle_softirqs+0x47f/0x610
[ 22.950936][ T230] softirqs last enabled at (2043214): [] __tun_set_ebpf+0xc6/0x180
[ 22.951211][ T230] softirqs last disabled at (2043212): [] __tun_set_ebpf+0x91/0x180
[ 22.951478][ T230] ---[ end trace 0000000000000000 ]---